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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:: , Hebbeln D, Mohtadi M (2010) No signature of abyssal carbon in intermediate waters off Chile during

Color Reflectance Spectroscopy : a tool for rapid characterization of deep-sea sediments

Creator:: Mix, Alan C., Rugh, W., Pisias, Nicklas G., Veirs, S., and Leg 138 Scientific Party
Abstract:: During ODP Leg 138, we tested a prototype instrument, developed at Oregon State University, for measuring light reflectance in 511 channels of the visible and near-infrared bands. The technique of reflectance spectroscopy has been used for some time in chemistry and mineralogy (e.g., Hunt, 1977; Gaffey, 1986) and has found...
Resource Type:: Article
Full Text:: constant output. No light source achieves all of these specifications. To approximate these conditions at

Terrigenous Fe input and biogenic sedimentation in the glacial and interglacial equatorial Pacific Ocean

Creator:: Murray, R. W., Leinen, M., Murray, D. W., Mix, Alan C., and Knowlton, C. W.
Abstract:: Many ocean regions important to the global carbon budget, including the equatorial Pacific Ocean, have low chlorophyll concentrations despite high levels of conventional nutrients. Iron may instead by the limiting nutrient, and elevated input of terrigenous Fe during windy glacial episodes has been hypothesized to stimulate oceanic productivity through time...
Resource Type:: Article
Full Text:: ) terrigenous input to the region shows no consistent pattern of either glacial or interglacial maxima, (2) the

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:: providing the best choice for this experiment. On the basis of an assumption of no anthropogenic carbon in

Evaluation of automated flow-through time-resolved analysis of foraminifera for Mg/Ca paleothermometry

Creator:: Klinkhammer, Gary P., Haley, Brian A., Mix, Alan C., Benway, H. M., and Cheseby, M.
Abstract:: The primary Mg/Ca ratio of foraminiferal shells is a potentially valuable paleoproxy for sea surface temperature (SST) reconstructions. However, the reliable extraction of this ratio from sedimentary calcite assumes that we can overcome artifacts related to foraminiferal ecology and partial dissolution, as well as contamination by secondary calcite and clay....
Resource Type:: Article
Full Text:: , the rigor of cleaning increases from left to right. We found that cleaning with ethanol with no

Increased dissolved terrestrial input to the coastal ocean during the last deglaciation

Creator:: Klinkhammer, Gary P., Mix, Alan C., and Haley, B. A.
Abstract:: Here we present the first downcore results for a new paleoproxy, the Mn/Ca ratio of foraminiferal calcite, applied to sediment accumulated in the extreme Eastern Tropical North Pacific (ETNP) over the last 30,000 years. The Mn/Ca results are compared to oxygen isotopes and sea surface temperature calculated from Mg/Ca. We...
Resource Type:: Article
Full Text:: coastal ocean during the last deglaciation G. P. Klinkhammer and A. C. Mix College of Oceanic and

The use of foraminiferal uranium/calcium ratios as an indicator of changes in seawater uranium content

Creator:: Russell, Ann D., Emerson, Steven, Mix, Alan C., and Peterson, Larry C.
Abstract:: We examine the utility of the uranium (U) content of planktonic foraminifera tests as an indicator of past changes in seawater U content. The U/Ca ratio in foraminifera from Atlantic and Caribbean cores in constant in the Holocene and decreases by ~25% during the last glacial period. Magnesium/calcium (Mg/Ca) ratios...
Resource Type:: Article
Full Text:: Indicator of Changes in Seawater Uranium Content PALEOCEANOGRAPHY, VOL. 11, NO. 6, PAGES 649-663, DECEMBER

Sediment depths determined by comparison of grape and logging denisty data during Leg 138

Creator:: Mix, Alan C., Harris, Sara E., Hagelberg, T. K., Pisias, Nicklas G., and Shackleton, N. J.
Abstract:: Establishing true depths of recovered sediments is critical to determining sedimentation rates for high-resolution paleoclimatic studies. We have corrected the composite depth scale, which accounts for the entire continuous sedimentary sequence, so that sediment depths are consistent with logging depths, or "true" depths. We accomplished this by taking advantage of...
Resource Type:: Article
Full Text:: density data is much higher than that of log density data because the logging tool smooths information

Spatial and temporal variability of late Neogene Equatorial Pacific carbonate : ODP Leg 138

Creator:: Hagelberg, T. K., Pisias, Nicklas G., Mayer, L. A., Shackleton, N. J., and Mix, Alan C.
Abstract:: High resolution, continuous records of GRAPE wet bulk density (a carbonate proxy) from Ocean Drilling Program Leg 138 provide one the opportunity for a detailed study of eastern equatorial Pacific Ocean carbonate sedimentation during the last 6 m.y. The transect of sites drilled spans both latitude and longitude in the...
Resource Type:: Article
Full Text:: longitudinal positions of the drilled sites have changed by no more than 0.5° latitude and 4° longi tude over

Refinement of a high-resolution, continuous sedimentary section for studying Equatorial Pacific Ocean paleoceanography, Leg 138

Creator:: Hagelberg, T. K., Pisias, Nicklas G., Shackleton, N. J., Mix, Alan C., and Harris, Sara E.
Abstract:: Ocean Drilling Program (ODP) Leg 138 was designed to study the late Neogene paleoceanography of the equatorial Pacific Ocean at time scales of thousands to millions of years. Crucial to this objective was the acquisition of continuous, high-resolution sedimentary records. It is well known that between successive advanced piston corer...
Resource Type:: Article
Full Text:: about whether a set of samples is statistically different from one another, with no information about

ScholarsArchive@OSU

Global climate evolution during the last deglaciation

Color Reflectance Spectroscopy : a tool for rapid characterization of deep-sea sediments

Terrigenous Fe input and biogenic sedimentation in the glacial and interglacial equatorial Pacific Ocean

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

Evaluation of automated flow-through time-resolved analysis of foraminifera for Mg/Ca paleothermometry

Increased dissolved terrestrial input to the coastal ocean during the last deglaciation

The use of foraminiferal uranium/calcium ratios as an indicator of changes in seawater uranium content

Sediment depths determined by comparison of grape and logging denisty data during Leg 138

Spatial and temporal variability of late Neogene Equatorial Pacific carbonate : ODP Leg 138

Refinement of a high-resolution, continuous sedimentary section for studying Equatorial Pacific Ocean paleoceanography, Leg 138

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