Publications and Presentation by Dr. Joseph D. Ortiz (Click on the links below to download the papers)

Refereed Publications (Download the data from the World Data Center for Paleoclimatology):

Ortiz, J.D., Application of Visible/near Infrared derivative spectroscopy to Arctic paleoceanography, IOP Conf. Series: Earth and Environmental Science 14, 2011, 012011 doi:10.1088/1755-1315/14/1/012011,
(http://iopscience.iop.org/1755-1315/14/1/012011/pdf/1755-1315_14_1_012011.pdf)

Nelson, D.B., Abbott, M.B., Steinman, B., Polissar, P.J. Stansell, N.D., Ortiz, J.D., Rosenmeier, M.F., Finney, B.P., and Riedel, J., 2011, Drought variability in the Pacific Northwest from a 6,000-yr lake sediment record, PNAS, doi/10.1073/pnas.1009194108.

Marchitto, T.M., Muscheler, R., Ortiz, J.D., Carriquiry, J., and A. van Geen, 2010, Dynamical response of the tropical Pacific Ocean to solar forcing during the early Holocene, Science, 330, 1378-1381, DOI: 10.1126/science.1194887.  

Yurco, L., Ortiz, J.D., Leonid Polyak, L., and Darby, D., Reflectance-based clay mineral cycles in Quaternary sediments from the Northwind Ridge: implications for glacial-interglacial sedimentation patterns in the Arctic Ocean, Polar Research, 2010, DOI: 10.1111/j.1751-8369.2010.00160.x.

Sorhannus, U., Ortiz, J.D., Wolf, M., Microevolution and Speciation in Thalassiosira weissfloggi, Protist, 161,237-249, 2009.

Lei, X., Ling, D., Mei-Xum, Z., Zhang, R.-P., van Geen, A. and Ortiz, J.D., Centennial variations in Sea surface temperature and productivity over the last 14ka from core PC14 off Baja California, [In Chinese with English Abstract], Oceanologica et Limnologia Sinica, 40, 385-392, 2009.

Witter, D., Ortiz, J.D, Palm, S. Heath, R., Budd, J., Assessing the Application of SeaWiFS Ocean Color Algorithms to Lake Erie, Journal of Great Lakes Research, 35, 361-370, 2009.

Ortiz, J.D., Polyak, L., Grebmeier, J.M., Darby, D.A., Eberl, D.D., Naidu, S., Nof, D., Provenance of Holocene sediment on the Chukchi-Alaskan margin based on combined diffuse spectral reflectance and quantitative X-Ray Diffraction analysis. Global and Planetary Change, (68), 73-84, 2009.

Darby, D.A., Ortiz, J.D., Polyak, L., Lund, S., Jakobsson, M., Woodgate, R.A., The role of currents and sea ice in both slowly deposited central Arctic and rapidly deposited Chukchi-Alaskan margin sediments, Global and Planetary Change, (68), 58-72, 2009.

Adler, R.E., Polyak, L., Ortiz, J.D., Kaufman, D.S., Channell, J.E.T., Xuan, C., Grottoli, A.G., Sellen, E., Crawford, K.A., Sediment record from the western Arctic Ocean with an improved Late Quaternary age resolution: HOTRAX core HLY0503-8JPC, Mendeleev Ridge. Global and Planetary Change, (68), 18-29, 2009.

Brachfeld, S., Barletta, F., St-Onge, G., Darby, D.A., Ortiz, J.D., Detrital and diagenetic magnetic signatures of sediment supply and water column stratification in Holocene sedimentary records from the eastern Chukchi Sea. Global and Planetary Change, (68), 100-114, 2009.

Polyak, L., Bischof, J., Ortiz, J.D., Darby, D.A., Channell, J.E.T., Xuan, C., Kaufman, D.S., Løvlie, R., Schneider, D.A., Eberl, D.D., Adler, R.E., Council, E.A., Late Quaternary stratigraphy and sedimentation patterns in the western Arctic Ocean. Global and Planetary Change, (68), 5-17, 2009.

Marchitto, T.M., Lehman, S.J., Ortiz, J.D., Fluckinger, J., and A. van Geen, Marine radiocarbon evidence for the mechanism of deglacial atmospheric CO₂ rise (8 June 2007), Science 316 (5830), 1456. [DOI: 10.1126/science.1138679] (Supplemental Online Material).

Marchitto, T.M., Lehman, S.J., Ortiz, J.D., Fluckinger, J., and A. van Geen, Marine radiocarbon evidence for the mechanism of deglacial atmospheric CO₂ rise, Science, / www.sciencexpress.org / 10 May 2007 / Page 5 / 10.1126/science.1138679. (Advance online publication of above article).

Dean, W. E., Zheng, Y., Ortiz, J.D., and A. van Geen, Sediment Cd and Mo accumulation in the oxygen-minimum zone off western Baja California linked to global climate over the past 52 kyr, Paleoceanography, 21, PA4209, doi:10.1029/2005PA001239, 2006.

O'Connell, S., Ortiz, J.D., Morrison, J., Connecting Urban Students With Their Rivers Generates Interest And Skills In The Geosciences, Journal of Geoscience Education, 52, 462-471, 2004.

Ortiz, J.D., O’Connell, S., DelViscio, J., Dean, W., Carriquiry, J., Marchitto, T., Zheng, Y., and A. van Geen, Enhanced marine productivity off western North America during warm climate intervals of the past 52 kyr, Geology, 32(6), 521-524, 2004.

Ortiz, J.D. and O’Connell, S., Toward a non-linear grayscale calibration method for legacy photographic collections, in P. Francus, J. Thurow, (eds.) Developments in Paleocenvironmental Research Series: Image Analysis, sediments and paleoenvironmental Reconstruction, 121-137, 2004.

A. van Geen, Y. Zheng, J. M. Bernhard, K. G. Cannariato, J. Carriquiry, W. E. Dean, B. W. Eakins, J.D. Ortiz, J. Pike, and other participants, 1999 RV Melville Baja California cruise, On the preservation of laminated sediments along the western margin of North America, Paleoceanography, 18(4), 1098, doi:1029/2003PA000911, 2003.

Peteet, D., Beck, W., Ortiz, J.D. O’Connell, S, Kurdyla, D., and Mann, D. Rapid Vegetational and Sediment Change from Rano Aroi Crater, Easter Island, in Easter Island, Scientific Exploration into the World's Environmental Problems in Microcosm J. Loret and J.T. Tanacredi, Eds., Kluwer, Academic/Plenum Publishers, NY, 79-89, 2003.

O'Connell, S., and Ortiz, J.D. Data Report: Calcium carbonate stratigraphy from sample measurements and diffuse spectral reflectance at Site 1090, ODP Leg 177. In Gersonde, R., Hodell, D.A., and Blum, P. (Eds.), Proc. ODP, Sci. Results, 177 [Online]. URL: <http://www-odp.tamu.edu/publications/177_SR/chap_06/c6_.htm >.

      [Cited2002-08-20], 2002.

Zeebe, R.E, Sanyal, A., Ortiz, J.D., and D.A. Wolf-Gladrow, A theoretical study of the kinetics of the boric acid - borate equilibrium in seawater, Marine Chemistry, 73, 113- 124, 2001.

Ortiz, J.D., Mix, A.C., Wheeler, P.A., and R.M. Key, Anthropogenic CO₂ invasion into the northeast Pacific based on concurrent δ¹³C_DIC and nutrient profiles from the California Current, Global Biogeochemical Cycles, 14, 917-929, 2000.

deMenocal, P., Ortiz, J.D., Guilderson, T., and M. Sarnthein, Coherent high- and low-latitude Climate Variability during the Holocene Warm Period, Science, 288, 2198-2202,1999.

deMenocal, P., Ortiz, J.D., Guilderson, T., Adkins, J., Sarnthein, M., Baker, L., and M. Yarusinsky, Abrupt onset and terminations of the African Humid Period: Rapid climate responses to gradual insolation forcing, Quat. Science Reviews, 19, 347-361, 1999.

Ortiz, J. D. and F. R. Rack, Non-invasive sediment monitoring methods: Current and future tools for high-resolution climate studies, in Reconstructing Ocean History: A window into the future, Kluwer, New York, 343-380, 1999.

Ortiz, J.D., Mix, A., Harris, S., and S. O'Connell, Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments, Paleoceanography, 14, 171-186, 1999.

Ortiz, J.D., O'Connell, S., Leg 162 Shipboard Sedimentologists, and A. Mix, Data report: Spectral reflectance observations from Leg 162 recovered sediments, in Proc. ODP, Sci. Results, 162, Raymo, M.E., Jansen, E., Blum, P. and Herbert, T.D. (Eds.), College Station, TX, (Ocean Drilling Program), 259-264, 1999.

Hyun, S., Ortiz, J.D., Raymo, M.E., and A. Taira, Low-frequency oscillations in Site 983 sediments: Relationships between carbonate and productivity proxies Proc. ODP, Sci. Results, 162, in Raymo, M.E., Jansen, E., Blum, P. and Herbert, T.D. (Eds.), College Station, TX, (Ocean Drilling Program), 197-207, 1998.

Ortiz, J.D., and A.C. Mix, Comparison of Imbrie-Kipp transfer function and Modern Analog Temperature estimates using sediment trap and coretop foraminiferal faunas, Paleoceanography, 12, 175-190, 1997

Extended Abstracts

Ortiz, J.D., Andrews, J.T. and D.D. Eberl, Geographic distribution of Labrador Sea and Baffin Bay sediment mineralogy based on visible reflectance derivative spectroscopy, 41th International Arctic Workshop, Montral, CA, 2-4 March, 2011. (Online: http://www.arcticworkshop2011.uqam.ca/upload/files/41aw_abstact_volume.pdf)

Assareh, A., Volkert, L.G., and J.D. Ortiz, 2010, Evolutionary Selection of Regressional Predictors to Enhance the Performance of Microfossil-Based Paleotemperature Proxies, ICMLA, 379-385, 2010 Ninth International Conference on Machine Learning and Applications.
(Online: http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=5708860)

Ortiz, J.D., Mineralogy of Labrador Sea and Baffin Bay sediment inferred from diffuse spectral reflectance, 40th International Arctic Workshop, Winterpark CO, 10-12, March, 2010. (Online: http://instaar.colorado.edu/AW/abstract_details.php?abstract_id=47).

Crane, R. Sadallah, J., and J.D. Ortiz, Sedimentological Analysis of Holocene and Glacial Events in Central Baffin Bay, Labrador Sea: Constraints from Reflectance and Elemental Analysis, 40th International Arctic Workshop, Winterpark CO, 10-12, March, 2010.(Online: http://instaar.colorado.edu/AW/abstract_details.php?abstract_id=70).

Sadallah, J., Crane, R., and J.D. Ortiz, Sedimentological analysis of glacial events in Baffin Bay, Labrador Sea: constraints from grain size and elemental analyses, 40th International Arctic Workshop, Winterpark CO, 10-12, March, 2010.(Online: http://instaar.colorado.edu/AW/abstract_details.php?abstract_id=73).

Walton, M., Jennings, A., Andrews, J., Kilfeather, A., O’Cofaigh, C., Ortiz, J., Paleoceanographic reconstruction of West Greenland continental shelf at mouth of Disko Bugt, West Greenland 40th International Arctic Workshop, Winterpark CO, 10-12, March, 2010.(Online: http://instaar.colorado.edu/AW/abstract_details.php?abstract_id=83).

Unrefereed Publications

Ortiz, J.D. Falkner, K.K., Matrai, P.A., and R.A. Woodgate, From the Guest Editors: An Introduction to the Special Issue, Oceanography 24(3): 14–16, http://dx.doi.org/10.5670/oceanog.2011.49, 2011.

Ortiz, J.D., Undergraduate Research, Kent State University Faculty Professional Development Center Online Newsletter, Perspectives, April 2008 issue, cited 7-2-2008, (Description of this online journal:

      http://fpdc.kent.edu/resources/publications/perspectives/about_perspectives.html).

Ortiz, J.D., Paleoceanography, Biological Proxies: Temperature Proxies, Census Counts, in Encyclopedia of Quaternary Science, Ed. Scott A. Elias, Elsevier B.V, ISBN 0 44 451919 X, 1693-1699, 2006.

Darby, D., Polyak, L., Cutter, G., Edwards, M., Ortiz, J., and Berger, G., HLY0501 Cruise Report. UNOLS, USCG, and NSF, 38pp, 2006.

CoreWall Steering Committee (Higgins, S., Hovan, S., Ito, E., Miller, J., Morin, P. Neal, C., Ortiz, J., Quoidbach, D., and Snyder, W.), Workshop on the Development of the CoreWall Suite of Applications, Scientific Drilling, No. 3, 58-60, 2006, doi:10.2204/iodp.sd.3.15.2006. (Separate report to NSF)

Brigham-Grette, J., S. Anderson, J. Clague, J. Cole, P. Doran, A. Gillespie, E. Grimm, P. Guccione, K. Hughen, S. Jackson, T. Jull, S. Leavitt, R. Mandel, J. Ortiz, D. Rodbell, C. Schweger, A. Smith, B. Styles, Petroleum Geologists' Award to Novelist Crichton Is Inappropriate, Eos Trans. AGU, 87(36), 364, 2006, doi:10.1029/2006EO360008.

Hubbard, M. J., D. A. Waugh and J. D. Ortiz, Provenance determination of archaeological cherts by vis/nir diffuse reflectance spectrometry, The Compass, vol. 78, no. 3, 2004.

O'Connell, S., Ortiz, J.D., Morrison, J., Connecting with the River, Geotimes, vol. 48, no. 9, 14-17, 2003 (Cover Story).

Ortiz, J.D., Application of non-invasive sedimentological methods to sediments from western pacific marginal basins, In C.-T. A. Chen (ed.) Marine Environment: The Past, Present and Future, The Fuwen Press, Kaohsiung, Taiwan, 128-137, 2002.

Ortiz, J.D., Paleoceanography and Paleoclimate, Geotimes, 46(7): 42-42, July, 2001.

Ortiz, J.D., Harris, S.E., Mix, A.C. and the Leg 177 Shipboard Scientific Party, SCAT Reflectance: Shedding some light on sediment mineralogy, JOI-USSSP Newsletter vol. 11 no. 2, p. 14-15,20, July 1998.

Abstracts

Mihindukulasooriya, L., Ortiz, J.D., Abbott, M., and Pompeani, D., 2011, Reconstruction of Holocene Paleoclimatic variability using high-resolution diffuse spectral reflectance data from Cleland Lake, British Columbia, 2011 GSA Annual Meeting in Minneapolis (9–12 October 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 5, p. 469.

Ortiz, J.D., and D. Nof, 2011, The influence of southern ocean winds and northern hemisphere meltwater on the Atlantic Meridional Overturning Circulation, Northeastern (46th Annual) and North-Central (45th Annual) Joint Meeting (20–22 March 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 100.

Mihindukulasooriya, L., Ortiz, J.D., Abbott, M., and D. Pompeani, 2011, Evaluation of Lake Sediment composition and productivity using high resolution diffuse spectral reflectance data from Cleland Lake, Southwestern Canada, Northeastern (46th Annual) and North-Central (45th Annual) Joint Meeting (20–22 March 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 162.

Nwaodua, E., and J.D. Ortiz, 2011, Late Quaternary clay mineral and iron oxide distributions on the Bering and Chukchi Sea Shelves: A proxy for ocean circulation through the Bering Strait, Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 61.

Crane, R., Virost, A., Brenizer, L, and J.D., Ortiz, 2011, Marine sedimentological analysis from the Hudson Strait, Labrador Sea, Northeastern (46th Annual) and North-Central (45th Annual) Joint Meeting (20–22 March 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 61.

Siriwardana, C., Ortiz, J.D., Polyak, L., Witter, D., and Council, E., 2011, Paleoclimatic and mineralogical characterization of downcore VNIR, VIS DSR, and XRF data from the northwind ridge area in the Central Arctic Ocean, Northeastern (46th Annual) and North-Central (45th Annual) Joint Meeting (20–22 March 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 62.

Brenizer, L., Ortiz, J.D., Abbott, M., and R. Crane, 2011, Drought history of Scout Lake during the Holocene based on sediment lightness, Northeastern (46th Annual) and North-Central (45th Annual) Joint Meeting (20–22 March 2011), Geological Society of America Abstracts with Programs, Vol. 43, No. 1, p. 111.

Schiebel, R., Ivanova, E., J.D. Ortiz, Reconstruction of surface ocean stratification from species assemblages of planktic foraminifers, ICP-10, 2010.

Farinacci, M.D., Ortiz, J.D.; Schumacher, G.A. , 2010, Evidence of orbital forcing upon the Mississippian Vinton Member of the Logan Formation, Ohio. Abstracts with Programs - Geological Society of America Vol. 42, no. 1. Boulder, CO: Geological Society of America (GSA), Mar. 2010.

Crane, R.E., Farinacci, M.D., Sadallah, J.M., Ortiz, J.D., 2010, Sedimentological analysis of Holocene and glacial events in Baffin Bay, Labrador Sea. Abstracts with Programs - Geological Society of America Vol. 42, no. 1. Boulder, CO : Geological Society of America (GSA), Mar. 2010.

Ranasinghage, P. N., Ortiz, J. D., Moore, A. L., Siriwardana, C.; McAdoo, B. G., 2010, Signatures of Paleo-coastal Hazards in Back-barrier Environments of Eastern and Southeastern Sri Lanka, American Geophysical Union, Fall Meeting 2010, abstract #NH21A-1397

D.L. Witter, J.D. Ortiz, S. Palm, R.T. Heath, and J.W. Budd, Evaluating strategies for retrieving Lake Erie chlorophyll a concentrations from SeaWiFS observations, 52nd Annual Conference on Great Lakes Research, International Association for Great Lakes Research, May 2009.

A.K. Ali, D.L. Witter, and J.D. Ortiz, Multivariate Assessment of Remotely Derived Water Quality Parameters in the Western Basin of Lake Erie, 52nd Annual Conference on Great Lakes Research, International Association for Great Lakes Research, May 2009.

D.L. Witter, J.D. Ortiz, S. Palm, R.T. Heath and J.W. Budd, Assessing the application of SeaWiFS ocean color algorithms to Lake Erie, American Geophysical Union, Fall Meeting, Dec. 2008.

Ranasinghe, P. N. Ortiz, J., Moore, A, and Siriwardana, C.H.E.R., 2009, Non invasive multi proxy approach to recognize paleo-coastal environmental signals, GSA 2009, Portland.

Ranasinghe, P. N. Ortiz, J., Moore, A, and Siriwardana, C.H.E.R., 2009, Paleo environmental reconstruction of lagoonal strata from Sri Lanka using multiple physical properties proxies to assure stratigraphic continuity, AGU 2009 , San Francisco.

Vlack, Y. A.; Ortiz, J. D.; Haynes, J. T.; Curry, B. B.; Carlson, E. H.; Grant, N. K., Identifying clays in sedimentary sequences utilizing a new clay mixture spectral library developed with spectral reflectance, Geological Society of America, Abstracts with Programs, Vol. 40, No. 2, Pg. 56. 2008.

Vlack, Y. A.; Ortiz, J. D.; Curry, B. B.; Haynes, J. T.; Grant, N. K.; Carlson, E. H., Application of diffuse spectral reflectance for clay mineral identification in sedimentary sequences, AAPG Bulletin, Annual Convention and Exhibition Abstracts, Vol. 17, Pg. 208. 2008.

Fela, N.A., Duff, M.P., Mills, L.R., Ortiz, J.D., Wijekoon, Nishanthi, and Baeseman, Jennifer, Summer distribution of total suspended particulates in the western basin of Lake Erie and Sandusky Bay, North-Central Section - 42nd Annual Meeting (24–25 April 2008), Paper No. 36-13, 2008.

Ortiz, J.D., Polyak, L., Adler, R., Jakobsson, M., Darby, D., Late Pleistocene sediment provenance on the Mendeleev Ridge, Arctic Ocean, from XRF Elemental Analysis and Diffuse Spectral Reflectance measurements, AGU, 88(52), Fall Meet. Suppl., PP51A-0184., 2007.

Orsburn, C., Ortiz, J. D., Polyak, L., Grebmeier, J. M., Darby, D., Distribution of clay minerals on the Alaskan margin near Barrow Canyon revealed by Diffuse Spectral Reflectance measurements, AGU, 88(52), Fall Meet. Suppl., PP51A-0188, 2007.

Rand, J., Darby, D. A., Ortiz, J., Cook, M. Y.,  Keigwin, L., The Holocene Record of the Arctic Oscillation and a Possible Link to Solar Variability, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract PP51A-0187, 2007.

Adler, R. Polyak, L., Ortiz, J., Grottoli, A., Kaufman, D., Late Quaternary Paleoceanography of the Mendeleev Ridge, Central Arctic Ocean: Planktonic Foraminiferal Composition and Stable Isotopy, AGU, 88(52), Fall Meet. Suppl., PP51A-0183, 2007.

Robinson, K. D., Rosenmeier, M. F., Ortiz, J.D. , Holocene Lake Productivity and Inferred Climate Histories From High-Altitude Sites Within the Baroon Taiga Mountains, Northern Mongolia, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract PP33D-06, 2007.

Polyak, L., Adler, R., Curry, W.B., Ortiz, J., Application of Foraminiferal Stable Isotopy to Quaternary Stratigraphy and Paleoceanography of the Central Arctic Ocean, Eos Trans. AGU, 88(52), Fall Meet. Suppl., Abstract PP42B-04, 2007.

Ortiz, J.D., Polyak, L., Jakobsson, M., Darby, D., Preliminary evidence of Milankovitch cyclicity recorded in sediment brightness (L*) records from central Arctic Ocean sediments recovered by the HOTRAX Program, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 28, Paper No. 21-4, 2006.

Ortiz, J.D.; Polyak, Leonid; Darby, Dennis, Diffuse spectral reflectance of Arctic Ocean sediment cores provides new insights into changes in sediment sources, XIX AMQUA Biennial Meeting, Program with Abstracts 2006.

Ortiz, J.D., Munro-Stasiuk, M.J., Hart, B.I., Mokaren, D.M., Arnold, B.,  Chermansky, J.V., Vlack, Y.A., Inquiry based Teacher Professional development from a multidisciplinary perspective: The NEOGEO Lake Erie Earth Science Field Trip, Eos Trans. AGU, 87(52), Fall Meet. Suppl., ED43E-0960, 2006.

Ortiz, J.D., Polyak, L., Jakobsson, M., Darby, D., Quaternary Inferences on Central Arctic Ocean Circulation and Sediment Provenance Based on Diffuse Spectral Reflectance Analysis, Eos Trans. AGU, 87(52), Fall Meet. Suppl., OS53B-1098, 2006.

Polyak, L., Ortiz, J.D., Darby, D.A., Sediment Records From the Alaskan/Chukchi Slope Suggest High Meltwater Inputs From the Northern Laurentide Margin During the Last Deglaciation, Eos Trans. AGU, 87(52), Fall Meet. Suppl., OS52B-08, 2006.

Witter, D.L., Ortiz, J.D., Sheridan, S.C., Munro-Stasiuk, M.J., Myers, V.J., Schwenk, P.L., Vlack, Y.A.,  Arnold, B.J., Bosley, B.L., Chermansky, J.V., Hart, B.I., Kline, W.T., Bringing Earth Science to the K-12 Classroom: Implementation and Impacts of a Five-Day Professional Development Workshop for Teachers, Eos Trans. AGU, 87(52), Fall Meet. Suppl., ED43E-.0959, 2006.

Wijekoon, N., Ortiz, J., Munro-Stasiuk, M. , Remote sensing of total suspended particulates in the western basin of Lake Erie, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 7, Paper No. 4-5, 2006.

Wijekoon, N., Ortiz, J.D., Remote monitoring of a coastal wetland in LakeErie. 5th Annual New York State Remote Sensing Symposium on Remote Sensing Across the Great Lakes, Rochester, New York, 2006

Wijekoon, N., Ortiz, J.D., Witter, D.L., Munro-Stasiuk, M. J., The distribution of surface reflector patterns at Old Woman Creek Estuary in summer 2005. National Estuarine Research Reserve Association and System (NERRA/NERRS) annual conference, Sawmill Creek Resort and Conference Center, Huron, OH, 2006

Wijekoon, N., Ortiz, J.D., Witter, D.L., Munro-Stasiuk, M. J., A satellite remote sensing monitoring program for suspended sediment concentration at Old Woman Creek estuarine reserve, Ohio. Water Resources Research Institute (WRRI) annual conference, Kent State University, Kent, OH, 2006

Wijekoon, N., Ortiz, J.D., Witter, D.L., Munro-Stasiuk, M. J., Synoptic survey of suspended particulates in surface water at Old Woman Creek estuary using calibrated Landsat TM imagery. Researchers’ Day Meeting, Old Woman Creek National Estuarine Research Reserve, Huron, OH, 2005.

Wijekoon, N., Ortiz, J.D., Witter, D.L., Munro-Stasiuk, M. J., A satellite remote sensing monitoring program for suspended sediment concentration at Old Woman Creek estuarine reserve, Ohio. The 18th biennial conference of the Estuarine Research Federation, Norfolk, VA, 2005

Feucht, D., Ortiz, J.D., Munro-Stasiuk, M., and Witter, D.L., Partitioning of total suspended particulates in the Western Basin of Lake Erie and Sandusky Bay by laser particle size analysis, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 7, Paper No. 4-7, 2006.

Witter, D.L., Ortiz, J.D, Munro-Stasiuk, M.J., and Sheridan, S.C., Teaching earth system science from an inquiry-based perspective, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 24, Paper No. 18-7, 2006.

Yurco, L.N., Ortiz, J.D., and Polyak, L., Glacial-interglacial grain size variations on the Northwind Ridge, Arctic Ocean, Measured by Laser Particle Size Analyzer, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 69, Paper No. 30-37, 2006.

Witter, D.L., Ortiz, J.D., Munro-Stasiuk, M.J., and Sheridan, S., Dovetailing science content instruction and pedagogical training for successful GK-12 fellow preparation, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 363, Paper No. 145-19, 2006.

Palm, S.J., Witter, D.L., Ortiz, J.D., Heath, R.T., and Budd, J.W.,  Ground-truthing satellite chlorophyll concentration algorithms in Lake Erie, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 7, p. 24, Paper No. 4-3, 2006.

Marchitto, T.M., Lehman, S.J., Ortiz, J.D., van Geen, A., Intermediate water ¹⁴C evidence for the mechanism of deglacial CO₂ increase, Eos Trans. AGU, 87(52), Fall Meet. Suppl. PP43C-06, 2006.

Marchitto, T. M., S. J. Lehman, Ortiz, J.D. and A. van Geen, The oceans great deglacial CO₂ release: Evidence from deep sea CaCO₃ preservation and intermediate water ¹⁴C activity, 16th Annual V. M. Goldschmidt Conference, Melbourne, August 27-September 1, 2006.

Witthaus, L., Abbott, M., Anderson, L., Ortiz, J., Holocene Paleoclimate From Stable Isotope Geochemistry Of Squanga Lake, Southern Yukon Territory, Canada, Eos Trans. AGU, 87(52), Fall Meet. Suppl., PP51C-1153, 2006.

Munro-Stasiuk, M.J., Benko, T., Czajkowski, K., Sheridan, S., Merry, C., Witter, D.L., and Ortiz, J., Incorporating geospatial technology into the K-12 curriculum through teacher professional development, North-Central Section–40th Annual Meeting (20–21 April 2006), Geological Society of America Abstracts with Programs, Vol. 38, No. 4, p. 24, Paper No. 18-8, 2006.

Carriquiry J.D., Sanchez A., van Geen A., Ortiz J.D., Marchitto T., Zheng Y., Levi C., and Dean W. 2005. Contrasting Ocean Circulation and Hydrography of the Northeast Pacific Ocean: Holocene vs Last Glacial conditions. PAGES Second Open Science Meeting 10-12 August 2005, Beijing, China.

Witthaus, L., Abbott, M.B., Ortiz J., and Anderson, L. Holocene paleoclimate reconstructions from stable isotope geochemistry in carbonate lakes from the southern Yukon Territory, Canada. NE GSA, Saratoga Springs, 2005.

Marchitto, T. M., Ortiz, J.D. Carriquiry, C. Levi, and A. van Geen, A 14,000 year foraminiferal trace metal record of ENSO-influenced upwelling near southern Baja California, American Geophysical Union 2005 Fall Meeting, San Francisco, December 5-9, 2005.

Marchitto, T. M., J. D. Ortiz, J. D. Carriquiry, A. Sanchez, W. Dean, Y. Zheng, C. Levi, and A. van Geen, ENSO-influenced upwelling off of Southern Baja California since the last glaciation, American Geophysical Union 2004 Fall Meeting, San Francisco, December 13-17, 2004.

O’Connell, S., and J.D. Ortiz, Connecting with the River leads to an enhanced view of science for minority high school students, Abstract submitted to GSA Annual Meeting, Geological Society of America Abstracts with Programs, Vol. 36, No. 5, Denver 7-10 November, 2004.

Marchitto, T, Lehman, S., Ortiz, J.D, Carriquiry, J., Sanchez, A., Dean W., Zheng, Y, Levi, C., Vicarelli, M., and van Geen, A., ENSO dynamics and baja California oxygen minimum zone strength since the last glaciation, Abstract submitted to GSA Annual Meeting, Geological Society of America Abstracts with Programs, Vol. 36, No. 5, Denver 7-10 November, 2004.

Fleisher, M.O., Anderson, R.F., Ortiz, J.D., and A. vanGeen, Radionuclide Proxies for Particle Flux and Productivity Changes during the Last 40 ka from the Pacific Margin of Baja California, 8^th International Conference on Paleoceanography (ICP VIII) Program and Abstracts, p. 85, Biarritz, France, 5-10 September 2004.

Ivanova E.V., Ortiz J.D., Schiebel R, Wilsbacher M., Paleoceanographic variability in the Arabian Sea during the last 250 kyr, 8^th International Conference on Paleoceanography (ICP VIII) Program and Abstracts, p. 90, Biarritz, France, 5-10 September 2004.

Marchitto, T, Lehman, S., Ortiz, J.D, Carriquiry, J., Sanchez, A., Dean W., Zheng, Y, Levi, C., Vicarelli, M., and van Geen, A., ENSO dynamics and baja California oxygen minimum zone strength since the last glaciation, 8^th International Conference on Paleoceanography (ICP VIII) Program and Abstracts, p. 7-8, Biarritz, France, 5-10 September 2004.

van Geen, A., Levi, C., Ortiz J.D., Zheng, Y., Marchitto, T.M., Carriquiry, J.D., Decadal Record of Variations in Thermocline Structure of the Eastern Pacific from Soledad Basin, Baja California, 8^th International Conference on Paleoceanography (ICP VIII) Program and Abstracts, p. 210, Biarritz, France, 5-10 September 2004.

Seders, L.A, Smith, A.J., Palmer, D.F., Namjesnik-Dejanovic, K, and J.D. Ortiz, Water Quality and Ostracodes: Tracking Changes in Road Salt and Nitrate in a Northeast Ohio Watershed, North-Central GSA, Geological Society of America Abstracts with Programs, 36(3), p. 12, September 2004.

Ortiz, J.D., O’Connell, S.E., DelViscio, J., L., vanGeen, A., and Luc Beaufort, Regime Shifts in Productivity off Baja California during the Late Pleistocene?, 2003 Fall AGU Meeting, EOS Trans. AGU, 83(47), Fall Meet. Suppl., Abstract OS22C-04, 2003.

Ivanova E., Beaufort, L., Vidal, L., and J.D. Ortiz, Paloceanographic Changes in the Eastern Equatorial Pacific During the Late Pleistocene: Preliminary Results of Core MD02-2529 From the IMAGES VIII MONA Cruise, 2003 Fall AGU Meeting, EOS Trans. AGU, 83(47), Fall Meet. Suppl., Abstract OS31B-0211, 2003.

Anderson, B., Fleisher, M., Ortiz, J.D., Y. Zheng, and A. van Geen, Climate-related changes in particle flux and export production during the last 40 ka from the Pacific margin of Baja, Mexico, 2003 Fall AGU Meeting, EOS Trans. AGU, Fall Meet. Suppl., Abstract OS22C-06, 83(47), 2003.

Ortiz, J.D., O’Connell S., DelViscio, J., Dean, W., Carriquiry, J.D., Marchitto, T., Zheng, Y.,  and A. van Geen Low latitude control of marine production off the western margin of North America during the last 52 kyr?, Annual GSA meeting, Geological Society of America Abstracts with Programs, Vol. 35, No. 6, p. 540, September 2003.

Wilsbacher, M.C., Ortiz, J.D., S. O’Connell, Zheng, Y., Marchitto, T., Carriquiry, J., Dean, W., A. van Geen, Mid-holocene climate reconstruction in the soledad basin using planktic foram assemblages, Geological Society of America Abstracts with Programs, 35(6), p. 192, September 2003.

Hubbard, J.M, Waugh, D.A., and J.D. Ortiz, Application of VIS/nIR spectral reflectance in sourcing and recognition of heat-treated cherts, Geological Society of America Abstracts with Programs, 35(6), p. 399, September 2003.

Marchitto T., Vicarelli, M., Carriquiry J., Dean W., Ortiz J.D., Zheng, Y., van Geen, A., Ventilation influence on Baja California oxygen minimum zone strength since the LGM: Constraints from benthic foraminiferal Mg/Ca, XVI INQUA Congress Program with Abstracts, Paper No. 18-5, p. 101, Reno Nevada, July 23 - 30, 2003.

Stefano, C., Ortiz, J.D., and Carlson, E.H., Clay Mineral Identification by Diffuse Spectral Reflectance, GSA North-Central Section, 37th Annual meeting, Abstracts with Programs 35(2), 13-5, (Kansas City, MO), Geological Society of America, 2003.

Delvisico, J.G., OConnell, S., Ortiz, J.D., Diffuse Spectral Reflectance Records from the Northeast Pacific Oxygen Minimum Zone: Evidence for Rapid Shifts in Carbonate and Organic Carbon throughout the Holocene, AGU 2002 Spring Meeting, EOS Trans. AGU, 83(19), Spring Meet. Suppl., Abstract OS22A-08, 2002.

Ortiz, J.D., Quaternary Marine Productivity Variations off Baja California, American Quaternary Association, 17^th Biennial Meeting, (AMQUA 2002), Program and Abstracts, (Ed. D.R. Yesner), University of Alaska, Anchorage, p. 105-107, 2002.

Ortiz, J.D., and O’Connell, S., Toward a non-linear grayscale calibration method, in Image analysis, Sediments and Paleoenvironments, Nov 8-10^th, (Conveners: P. Francus, R. Bradley, and J. Thurow), Program and Abstracts, University of Massachusetts, Amherst, p. 20, 2001.

O’Connell, S., Ortiz, J.D., vanGeen, A., and Zheng, Y., Rapid changes in organic carbon preservation in sediments from coastal Baja California are linked to global climatic changes, Geo-Odyssey, GSA Annual meeting Abstracts with Programs 33(6), A-159, (Boston, MA), Geological Society of America, 2001.

deMenocal, P., Ganssen, G., Marchitto, T., and Ortiz, J.D., Holocene variability of the Atlantic and Indian subtropics, Geo-Odyssey, GSA Annual meeting Abstracts with Programs 33(6), A-159, (Boston, MA), Geological Society of America, 2001.

Ortiz, J.D., Marchitto, T.M., Cariquiry, T.M., Zheng, Y., Do Millennial scale carbonate and organic carbon cycles in Late Pleistocene sediments off Baja California reflect production or preservation?, EOS Trans. AGU, 82(20), Spring Meet. Suppl., Abstract OS41A-10, S226, 2001.

Marchitto, T.M., Cariquiry, J., Ortiz, J.D., and van Geen, A., Uvigerina, from laminated sediments may record bottom water nutrient levels, EOS Trans. AGU, 82(20), Spring Meet. Suppl., Abstract OS41A-12, S227, 2001.

deMenocal, P.B., J. Adkins, Ortiz, J.D., T. Guilderson, Millennial-Scale Sea-Surface Temperature Variability During The Last Interglacial and its Abrupt Termination, EOS 81(48), F675, American Geophysical Union, Fall Meeting Supplement, 2000.

Wolf-Gladrow, D.A., Zeebe, R.E., Sanyal, A., and Ortiz, J.D., A theoretical study of the kinetics of the boric acid,- borate equilibrium in seawater, EOS 81(48), F620, American Geophysical Union, Fall Meeting Supplement, 2000.

Passow, M., Ortiz, J.D., Witter, D., Small, C., Visbeck, M., Lerner-Lam, A., Lotti Bone, R., Anderson, O.R., Sambrotto, R., Armbruster, J., and Griffin, K., Earth2Class: What research scientists can share with classroom teachers (Extended Abstract), in Abstract Volume, Tenth Symposium on Education, American Meterological Society Annual Meeting, Albuquerque, NM, 2001.

Ortiz, J.D., O’Connell, S., van Geen A and Melville ’99 Shipboard Scientific Party, Deep sea sediments off Baja California reflect Greenland ice core climate cycles, Summit 2000 GSA Annual meeting Abstracts with Programs (Reno, NV) Geological Society of America, P-101, 2000.

O’Connell, S. and J.D. Ortiz, Hot times in the city: Urban heat island exercise for students studying climate change, Summit 2000 GSA Annual meeting Abstracts with Programs (Reno, NV) Geological Society of America, 2000.

Farmer, C, Kaplan, A., deMenocal, P.B., and J.D. Ortiz, Towards a joint faunal-isotopic transfer function for reconstructing past changes in tropical upper-ocean thermal structure. Eos, 80(46), F531, American Geophysical Union, Fall Meeting Supplement, 1999.

Adkins, J., deMenocal, P.B., and J.D. Ortiz, Rapid variability in eolian accumulation rate and sediment focusing off North Africa (ODP Site 658). Eos, 80(46), F531, American Geophysical Union, Fall Meeting Supplement, 1999.

Passow, M., Witter, D., Ortiz, J.D., Newton, R., Lotti Bond, R., and M. Visbeck, (Extended Abstract) What can classroom teachers learn from research scientists? A Maury Project experience. Ninth Symposium on Education, American Meterological Society Annual Meeting, 1999.

O'Connell, S., Ortiz, J.D., Ranganathan, J., and J. McManus, Generating a grayscale time-series record from Ocean Drilling Program cores for classroom use, GSA 1999 Annual meeting Abstracts with Programs (Denver, CO) Geological Society of America, 1999.

O'Connell, S., Venherm, C., Raymo, M.E., Ganley, K. and J.D. Ortiz, Mid-Pleistocene sediment dynamics and paleoceanography at Feni Drift, ODP Site 980, Eos, 80(17), S169, American Geophysical Union, Spring Meeting Supplement, 1999.

Ortiz, J.D., Mix, A.C., Wheeler, P,A. and R.M. Key, An estimate of the anthropogenic offset of oceanic ¹³C_DIC based on the ventilation of the California Current at 42^oN, IUGG99 Abstract Volume, Birmingham, UK, International Union of Geodesy and Geophysics, A181, 1999.

Ortiz, J.D., Application of non-invasive sedimentological methods to sediments from western pacific marginal basins, in Conference on Marine Environments: Past Present and Future Symposium Vol. (Jan., 26-28, 1999, Kaohsiung, Taiwan, R.O.C), 1999.

deMenocal, P.B., Ortiz, J.D., and M. Sarnthein, Holocene variations in subtropical Atlantic sea-surface temperatures: links to the North Atlantic, PAGES Conference, London, 1998.

Jansen, E., Fronval, T., Kleiven, H., Channell, J.E., Ortiz, J.D., Solheim, A., T. Dokken, A continuous Record of Northner Hemisphere Glaciation from ODP Leg 162, Eos, 78(46), F353, American Geophysical Union, Fall Meeting Supplement, 1997.

Lynch-Stieglitz, J., Ortiz, J.D., and D.H. Sandweiss, The global fingerprint of early Holocene climate, Eos, 78(46), F375, American Geophysical Union, Fall Meeting Supplement, 1997.

Ranganathan, Jai V., O'Connell, S. Ortiz, J.D., and J. McManus, An improved grayscale analysis method for estimating calcium carbonate content in deep-sea cores, GSA 1997 Annual meeting, Abstracts with Programs - Geological Society of America, 29(6), Meeting: Oct. 20-23, 1997, Salt Lake City, UT, 1997.

Ortiz, J.D., and A.C. Mix, Environmental control of oxygen and carbon isotopicdisequilibria in asymbiotic planktic foraminifera, Eos, 77(46), F334, American Geophysical Union, Fall Meeting Supplement, 1996.

Kohfeld, K.E., Ortiz, J.D., and R.F. Anderson, Temperature-dependent carbon isotope disequilibrium explains low ¹³C of polar planktonic foraminifera across the Antarctic Polar Front, Eos, 77(17), S160, American Geophysical Union, Spring Meeting Supplement, 1996.

Harris, S.E., Mix, A.C., Ortiz, J.D., and D.C. Lund, Terrigenous and biogenic marinesediment variability: A new high-resolution view from reflectance spectroscopy. 30th International Geological Congress, (Beijing, China, 4-14 August, 1996), Abstract Vol. 2, p.217, 1996.

Doose, H., Ortiz, J.D, Prahl, F.G., Suess, E., UK'37 temperature record in the California current system; a comparison of the modern and the last glacial maximum, Terra Abstracts. Vol. 7, Abst. Suppl. 1., p. 220. Oxford : Blackwell Scientific Publications, 1995.

Ortiz, J.D., Mix, A.C., and S. Hostetler, Comparison of planktic Foraminiferal faunas from mid-latitude sediment traps with core top and Last Glacial Maximum faunas, Eos 75(44) 392, Fall Meeting Supplement, 1994.

Ortiz, J.D., Mix, A.C., and R.W. Collier, Planktic foraminifers and plankton biomass in the California Current at 42^oN, September 1990, 73(23), 310, American Geophysical Union, Fall Meeting Supplement, 1992.

Ortiz, J.D., Mix, A.C., and R.W. Collier, Planktic foraminifers in MOCNESS tows from the California Current during September, 1990, in ICP IV Abstract Volume, Sarnthein, M., Thiede, J. and Zahn, R. (Eds.), GEOMAR Report 15, Kiel, 1992.

Ortiz, J.D., and A.C. Mix, The spatial distribution and seasonal succession of modern Foraminifera in the California Current off Oregon, Eos 71(43), 1352, American Geophysical Union, Fall Meeting Supplement, 1990.

Ortiz, J.D., and A.C. Mix, The spatial and temporal distribution of foraminiferal assemblages in the California Current off Oregon: Response to upwelling and seasonal forcing, in Evolution of upwelling systems since the early Miocene (Abstract volume), Summerhays, C.P., Prell, W., and Emeis. K.C., (Eds), London, 1990.