Index Catalog // ScholarsArchive@OSU

Creator:: Ortiz, Joseph D.
Abstract:: MOCNESS plankton tows, sediment traps and sedimentary material are used to determine the linkage between bio-physical forcing and foraminiferal response over a range of time scales from the event scale to the glacial interglacial cycle. The annually averaged planktic foraminiferal fauna of the modem California Current is a diverse community...
Resource Type:: Dissertation

Creator:: Ortiz, Joseph D. and Mix, Alan C.
Abstract:: We evaluate the reliability of statistical estimates of sea surface temperature (SST) derived from planktonic foraminiferal faunas using the modern analog method and the Imbrie‐Kipp method. Global core top faunas provide a calibration data set, while modern sediment trap faunas are used for validation. Linear regression of core top predicted...
Resource Type:: Article
Full Text:: Residual Error Slope Intercept 3.d' 2.6 0.92±0.16 4.2±2.8" 1.2 2.2 0.95±0.15 1.9±2.5 ORTIZ AND MIX

Creator:: Ortiz, Joseph D., Mix, Alan C., Wheeler, Patricia A., and Key, R. M.
Abstract:: The stable isotopic signature of dissolved inorganic carbon (δ¹³CDIC) in the northeast Pacific Ocean is lower in near-surface waters by 1.1‰ relative to values predicted from global oceanic trends of δ¹³CDIC versus nutrients. A combination of anthropogenic carbon uptake from the atmosphere and thermodynamic, air-sea gas exchange processes in different...
Resource Type:: Article
Full Text:: Current J. D. Ortiz Lamont-Doherty Earth Observatory of Columbia University, Palisades New York A

Creator:: Ortiz, Joseph D., O'Connell, Suzanne, and Mix, Alan C.
Abstract:: Sediment spectral reflectance measurements were generated aboard the JOIDES Resolution during Ocean Drilling Program Leg 162 shipboard operations. The large size of the raw data set (over 1.3 gigabytes) and limited computer hard disk storage space precluded detailed analysis of the data at sea, although broad band averages were used...
Resource Type:: Article
Full Text:: FROM RECOVERED SEDIMENTS1 Joseph D. Ortiz,2 Suzanne O’Connell,3 and Alan Mix4 ABSTRACT Sediment

Creator:: Ortiz, Joseph D., Mix, Alan C., and Collier, Robert W.
Abstract:: Plankton tows from the northern California Current constrain biological and physical influences on living planktonic foraminifera. In this region, the dominant factors controlling the size and distribution of symbiotic and asymbiotic species are light and food. Food decreases offshore. Light, needed for symbiont photosynthesis, increases offshore as water turbidity lessens....
Resource Type:: Article

Creator:: Ortiz, Joseph D., Mix, Alan C., Hostetler, Steven W., and Kashgarian, Michaele
Abstract:: Multiple paleoceanographic proxies in a zonal transect across the California Current near 42°N record modern and last glacial maximum (LGM) thermal and nutrient gradients. The offshore thermal gradient, derived from foraminiferal species assemblages and oxygen isotope data, was similar at the LGM to that at present (warmer offshore), but average...
Resource Type:: Article

Creator:: Ortiz, Joseph D., Mix, Alan C., Harris, Sara E., and O'Connell, Suzanne
Abstract:: Diffuse reflectance records from Feni Drift in the North Atlantic faithfully record sediment percent carbonate. A high-resolution, reflectance-based age model for these sediments derived from an orbitally tuned age model for western equatorial Atlantic, Ceara Rise sediments was generated by spectral frequency mapping. Power spectra of the Feni Drift record...
Resource Type:: Article

Creator:: Bullerjahn, George S., McKay, Robert M., Davis, Timothy W., Baker, David B., Boyer, Gregory L., D’Anglada, Lesley V., Doucette, Gregory J., Ho, Jeff C., Irwin, Elena G., Kling, Catherine L., Kudela, Raphael M., Kurmayer, Rainer, Michalak, Anna M., Ortiz, Joseph D., Otten, Timothy G., Paerl, Hans W., Qin, Boqiang, Sohngen, Brent L., Stumpf, Richard P., Visser, Petra M., and Wilhelm, Steven W.
Abstract:: In early August 2014, the municipality of Toledo, OH (USA) issued a ‘do not drink’ advisory on their water supply directly affecting over 400,000 residential customers and hundreds of businesses (Wilson, 2014). This order was attributable to levels of microcystin, a potent liver toxin, which rose to 2.5 μg L⁻¹...
Resource Type:: Article
Full Text:: L. Boyer d, Lesley V. D’Anglada e, Gregory J. Doucette f, Jeff C. Ho g,h, Elena G. Irwin i

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