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Joseph D. Ortiz


With training in Aquatic Biology and Oceanography, I work at the interface between sciences unraveling climate mysteries, exploring the relationship between sedimentary strata, and helping to improve water quality using electromagnetic sensing techniques.

My primary research interest is in the area of  paleoclimate. I study sedimentary records to extract climate-related information on seasonal  to glacial-interglacial  time scales. I employ diverse methods ranging from marine micropaleontology to light isotope geochemistry and core and well logging to decipher Earth's climate record.

Scholarly, Creative & Professional Activities

Nwaodua, E.C., and Ortiz, J.D., in press, Application of quotient normalization technique to minimize errors in diffuse spectral reflectance data collected under various conditions, The Journal of Sedimentary Research.

Steinman, B.A., Abbott, M.B., Mann, M.E., Ortiz, J.D., Finney, B., and Pompeani, D.P., Ocean-atmosphere forcing of hydroclimate in the Pacific Northwest on centennial timescales, Geophysical Research Letters, DOI: 10.1002/2014GL059499, 2014.

Jennings, A.,E., Walton, M.E., O ́Cofaigh, C.,  Kilfeather, A., Andrews, J.T., Ortiz, J.D., deVernal, A., and J.A. Dowdeswell, Paleoenvironments during Younger Dryas-Early Holocene retreat of the Greenland Ice Sheet from outer Disko Trough, central west Greenland, J. Quaternary Sci., DOI: 10.1002/jqs.2652, 2014.

Ortiz, J.D., Witter, D.L., Ali, K.A., Fela, N., Duff, M., and Mills, L., Evaluating multiple color producing agents in Case II waters from Lake Erie, International Journal of Remote Sensing, 34 (24), 8854-8880, 2013.

Lajeunesse, P., St-Onge, G., Locat, J., Duchesne, M.J., Higgins, M.D., Sanfaçon, R., and J.D. Ortiz, The Corossol structure: a possible impact crater on the seafloor of the northwestern Gulf of St. Lawrence, Eastern Canada, Meteoritics & Planetary Science, 48, Nr 12, 2542-2558, 2013, DOI: 10.1111/maps.12224. (Cover Story).

Ali, K.A., Witter, D.L., and J.D. Ortiz, Application of empirical and semi-analytical algorithms to MERIS data for estimating chlorophyll a in Case 2 waters of Lake Erie, Environmental Earth Sciences; DOI 10.1007/s12665-013-2814-0, published Oct 1, 2013.

Mou, X, Jacob, J., Lu, X., Robbins, S., Sun S., J.D. Ortiz. Diversity and distribution of free-living and particle associated bacterioplankton in Sandusky Bay and adjacent waters of Lake Erie Western Basin, Journal of Great Lakes Research 2013.

Darby, D.A., Ortiz, J.D., Grosch, C.E., Lund, S.P., 2012, 1,500-year cycle in the Arctic Oscillation identified in Holocene Arctic sea-ice drift, Nature Geoscience, 5, 897–900, doi:10.1038/ngeo1629.

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

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: 0.1126/science.1138679].

Dean, W. E., Zheng, Y., Ortiz, J.D., and A. van Geen, 2006, 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].

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

Research Areas
  • Marine Sedimentology
  • Marine Stratigraphy
  • Paleoclimate

American Geophysical Union (AGU)
Oceanography Society (TOS)
Geological Society of America (GSA)
Sigma Xi (Scientific research honor society)
American Quaternary Society (AMQUA)
National Association of Geoscience Teachers (NAGT)
Northern Ohio Geological Society (NOGS)

Joseph D. Ortiz
Department of Geology
Center for Ecology and Natural Resources Sustainability

Spring 2015 office hours:
McGilvrey Hall 336

Monday 10:30 a.m. – 12:30 p.m.
and 2:15 p.m. – 3:30 p.m.
Wednesday & Friday
10:30 a.m. – 12:30 p.m.
or by appointment

Graduate Coordinator



Phone: 330-672-2225
Fax: 330-672-7949