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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:: the problem of no-analog planktonic foraminiferal ass~mb~ages in the equatorial oceans ~at confounds

Thorium-230 normalized particle flux and sediment focusing in the Panama Basin region during the last 30,000 years

Creator:: Kienast, S. S., Kienast, M., Mix, Alan C., Calvert, S. E., and Francois, R.
Abstract:: Application of the ²³⁰Th normalization method to estimate sediment burial fluxes in six cores from the eastern equatorial Pacific (EEP) reveals that bulk sediment and organic carbon fluxes display a coherent regional pattern during the Holocene that is consistent with modern oceanographic conditions, in contrast with estimates of bulk mass...
Resource Type:: Article
Full Text:: ). Table 1. Cores Used in This Study Core ID Water Depth, m Longitude Latitude ME0005-24JC 2941 86

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:: for this study is shown in Figure 4 overlain on Ca leachate curves for multiple samples of G. ruber

Early to Late Holocene Surface Exposure Ages From Two Marine-Terminating Outlet Glaciers in Northwest Greenland

Creator:: Reusche, Melissa M., Marcott, Shaun A., Ceperley, Elizabeth G., Barth, Aaron M., Brook, Edward J., Mix, Alan C., and Caffee, Marc W.
Abstract:: Terrestrial chronologies from southern Greenland provide a detailed deglacial history of the Greenland Ice Sheet (GIS). The northern GIS margin history, however, is less established. Here we present surface exposure ages from moraines associated with two large outlet glaciers, Petermann and Humboldt, in the northwestern sector of the GIS. These...
Resource Type:: Article
Full Text:: for the boulder ages in this study; thus, we do not report uplift-corrected ages here. No corrections

Multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr

Creator:: de Garidel-Thoron, Thibault, Rosenthal, Yair, Beaufort, Luc, Bard, Edouard, Sonzogni, Corinne, and Mix, Alan C.
Abstract:: Sea surface temperature (SST) and salinity of the Western Pacific Warm Pool (WPWP) reflect global climate effects such as the El Niño–Southern Oscillation phenomenon. However, reconstructions of past changes in the WPWP from the geologic record vary depending on the specific proxy record used. Here we develop a multiproxy record...
Resource Type:: Article
Full Text:: ]. Table 1. Location and Mean Climatology of the Cores Discussed in this Study Core Longitude Latitude

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:: and interglacial equatorial Pacific Ocean GLOBAL BIOGEOCHEMICAL CYCLES, VOL. 9, NO. 4, PAGES 667-684

Simulating the global distribution of nitrogen isotopes in the ocean

Creator:: Somes, Christopher J., Schmittner, Andreas, Galbraith, Eric D., Lehmann, Moritz F., Altabet, Mark A., Montoya, Joseph P., Letelier, Ricardo M., Mix, Alan C., Bourbonnais, Annie, and Eby, Michael
Abstract:: We present a new nitrogen isotope model incorporated into the three-dimensional ocean component of a global Earth system climate model designed for millennial timescale simulations. The model includes prognostic tracers for the two stable nitrogen isotopes, 14N and 15N, in the nitrate (NO3−), phytoplankton, zooplankton, and detritus variables of the...
Resource Type:: Article
Full Text:: with a range of enrichment 128factors estimated in the field between 4–15‰ [Wada, 1980; 129Altabet et

Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1

Creator:: Kienast, Stephanie S., Friedrich, Tobias, Dubois, Nathalie, Hill, Paul S., Timmermann, Axel, Mix, Alan C., and Kienast, Markus
Abstract:: Sea surface temperatures (SST) and inorganic continental input over the last 25,000 years (25 ka) are reconstructed in the far eastern equatorial Pacific (EEP) based on three cores stretching from the equatorial front (~0.01°N, ME0005-24JC) into the cold tongue region (~3.6°S; TR163-31P and V19-30). We revisit previously published alkenone-derived SST...
Resource Type:: Article
Full Text:: ., Marcantonio et al., 2001; Kienast et al., 2007; Singh et al., 2011]. [4] The objective of this study is

Sediment size fractionation and focusing in the equatorial Pacific: Effect on ²³⁰Th normalization and paleoflux measurements

Creator:: Lyle, Mitchell, Marcantonio, Franco, Moore, Willard S., Murray, Richard W., Huh, Chih-An, Finney, Bruce P., Murray, David W., and Mix, Alan C.
Abstract:: We use flux, dissolution, and excess ²³⁰Th data from the Joint Global Ocean Flux Study and Manganese Nodule Project equatorial Pacific study Site C to assess the extent of sediment focusing in the equatorial Pacific. Measured mass accumulation rates (MAR) from sediment cores were compared to reconstructed MAR by multiplying...
Resource Type:: Article
Full Text:: paleoflux measurements 3 4 Working Title: Sediment size fractionation in the equatorial Pacific 5 6

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:: study are shown in Figure 4. The Mn/Ca ratios are consistent with d18O and the idea that N. dutertrei

ScholarsArchive@OSU

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

Thorium-230 normalized particle flux and sediment focusing in the Panama Basin region during the last 30,000 years

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

Early to Late Holocene Surface Exposure Ages From Two Marine-Terminating Outlet Glaciers in Northwest Greenland

Multiproxy assessment of the western equatorial Pacific hydrography during the last 30 kyr

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

Simulating the global distribution of nitrogen isotopes in the ocean

Near collapse of the meridional SST gradient in the eastern equatorial Pacific during Heinrich Stadial 1

Sediment size fractionation and focusing in the equatorial Pacific: Effect on ²³⁰Th normalization and paleoflux measurements

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

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