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Comparison of Imbrie-Kipp transfer function and modern analog temperature estimates using sediment trap and core top foraminiferal faunas

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

Anthropogenic CO₂ invasion into the northeast Pacific based on concurrent δ¹³CDIC and nutrient profiles from the California Current

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

Data report : spectral reflectance observations from recovered sediments

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

Environmental control of living symbiotic and asymbiotic foraminifera of the California Current

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

California Current of the last glacial maximum: Reconstruction at 42 °N based on multiple proxies

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

Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments

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

SchmittnerAndreasCEOASClimateSensitivityEstimated.pdf

Creator:: Schmittner, Andreas, Urban, Nathan M., Shakun, Jeremy D., Mahowald, Natalie M., Clark, Peter U., Bartlein, Patrick J., Mix, Alan C., and Rosell-Mele, Antoni
Abstract:: Assessing impacts of future anthropogenic carbon emissions is currently impeded by uncertainties in our knowledge of equilibrium climate sensitivity to atmospheric carbon dioxide doubling. Previous studies suggest 3 K as best estimate, 2–4.5 K as the 66% probability range, and non-zero probabilities for much higher values, the latter implying a...
Full Text:: Reconstructions 1 of the Last Glacial Maximum 2 3 Andreas Schmittner, 1* Nathan M. Urban, 2 Jeremy D

Global climate evolution during the last deglaciation

Creator:: Clark, Peter U., Shakun, Jeremy D., Baker, Paul A., Bartlein, Patrick J., Brewer, Simon, Brook, Edward J., Carlson, Anders E., Cheng, Hai, Kaufman, Darrell S., Liu, Zhengyu, Marchitto, Thomas M., Mix, Alan C., Morrill, Carrie, Otto-Bliesner, Bette L., Pahnke, Katharina, Russell, James M., Whitlock, Cathy, Adkins, Jess F., Blois, Jessica L., Clark, Jorie, Colman, Steven M., Curry, William B., Flower, Ben P., He, Feng, Johnson, Thomas C., Lynch-Stieglitz, Jean, Markgraf, Vera, McManus, Jerry, Mitrovica, Jerry X., Moreno, Patricio I., and Williams, John W.
Abstract:: Deciphering the evolution of global climate from the end of the Last Glacial Maximum approximately 19 ka to the early Holocene 11 ka presents an outstanding opportunity for understanding the transient response of Earth's climate system to external and internal forcings. During this interval of global warming, the decay of...
Resource Type:: Article
Full Text:: deglaciation Peter U. Clarka,1, Jeremy D. Shakunb,1, Paul A. Bakerc, Patrick J. Bartleind, Simon Brewere, Ed

Is methane venting at the seafloor recorded by δ13C of benthic foraminifera shells?

Creator:: Torres, Marta E., Mix, Alan C., Kinports, K., Haley, Brian A., Klinkhammer, Gary P., McManus, James, and de Angelis, M. A.
Abstract:: The isotopic composition of the dissolved inorganic carbon (DIC) collected at sites of active methane discharge on Hydrate Ridge, Oregon, reveals anaerobic methane oxidation mediated by bacteria, with δ13CDIC reaching values as low as –48‰ in the upper 4 cm of the sediment. In spite of the high sulfide levels...
Resource Type:: Article
Full Text:: following the procedures described by Ortiz et al. [2000]. Analytical precision of d13C in these analyses is

Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

Creator:: Mix, Alan C., Morey, Ann E., Pisias, Nicklas G., and Hostetler, Steven W.
Abstract:: The sensitivity of the tropics to climate change, particularly the amplitude of glacial‐to‐interglacial changes in sea surface temperature (SST), is one of the great controversies in paleoclimatology. Here we reassess faunal estimates of ice age SSTs, focusing on the problem of no‐analog planktonic foraminiferal assemblages in the equatorial oceans that...
Resource Type:: Article
Full Text:: . Imbrie, W. Prell, A. Martin, U. Pflaumann, J. Ortiz, D. Lund, and M. Feldberg were also helpful. L

ScholarsArchive@OSU

Comparison of Imbrie-Kipp transfer function and modern analog temperature estimates using sediment trap and core top foraminiferal faunas

Anthropogenic CO₂ invasion into the northeast Pacific based on concurrent δ¹³CDIC and nutrient profiles from the California Current

Data report : spectral reflectance observations from recovered sediments

Environmental control of living symbiotic and asymbiotic foraminifera of the California Current

California Current of the last glacial maximum: Reconstruction at 42 °N based on multiple proxies

Diffuse spectral reflectance as a proxy for percent carbonate content in North Atlantic sediments

SchmittnerAndreasCEOASClimateSensitivityEstimated.pdf

Global climate evolution during the last deglaciation

Is methane venting at the seafloor recorded by δ13C of benthic foraminifera shells?

Foraminiferal faunal estimates of paleotemperature: Circumventing the no-analog problem yields cool ice age tropics

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