Index Catalog // ScholarsArchive@OSU

Planktonic foraminifera, sea surface temperatures, and mechanisms of oceanic change in the Peru and south equatorial currents, 0–150 ka BP

Creator:: Feldberg, Melissa J. and Mix, Alan C.
Abstract:: Planktonic foraminiferal faunas of the southeast Pacific indicate that sea surface temperatures (SST) have varied by as much as 8–10°C in the Peru Current, and by ~5–7°C along the equator, over the past 150,000 years. Changes in SST at times such as the Last Glacial Maximum reflect incursion of high-latitude...
Resource Type:: Article
Full Text:: ; 4267 Oceanography: General: Paleoceanography; 4516 Oceanography: Physical: Eastern boundary currents

A new mechanism for Dansgaard-Oeschger cycles

Creator:: Petersen, S. V., Schrag, D. P., and Clark, P. U.
Abstract:: We present a new hypothesis to explain the millennial-scale temperature variability recorded in ice cores known as Dansgaard-Oeschger (DO) cycles. We propose that an ice shelf acted in concert with sea ice to set the slow and fast timescales of the DO cycle, respectively. The abrupt warming at the onset...
Resource Type:: Article
Full Text:: , Paleoceanography, 28, 24–30, doi:10.1029/2012PA002364. 1. Introduction [2] During the last glacial period, the

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:: techniques; 4267 Oceanography: General: Paleoceanography; 4299 Oceanography: General: General or

Southern Ocean control of glacial AMOC stability and Dansgaard-Oeschger interstadial duration

Creator:: Buizert, Christo and Schmittner, Andreas
Abstract:: Glacial periods exhibit abrupt Dansgaard-Oeschger (DO) climatic oscillations that are thought to be linked to instabilities in the Atlantic meridional overturning circulation (AMOC). Great uncertainty remains regarding the dynamics of the DO cycle, as well as controls on the timing and duration of individual events. Using ice core data we...
Resource Type:: Article
Full Text:: Dansgaard-Oeschger interstadial duration Paleoceanography Southern Ocean control of glacial AMOC

Southwest Atlantic water mass evolution during the last deglaciation

Creator:: Lund, D. C., Tessin, A. C., Hoffman, J. L., and Schmittner, A.
Abstract:: The rise in atmospheric CO₂ during Heinrich Stadial 1 (HS1; 14.5–17.5 kyr B.P.) may have been driven by the release of carbon from the abyssal ocean. Model simulations suggest that wind-driven upwelling in the Southern Ocean can liberate ¹³C-depleted carbon from the abyss, causing atmospheric CO₂ to increase and the δ¹³C...
Resource Type:: Article
Full Text:: the last deglaciation. Paleoceanography, 30 (5), 477-494. doi:10.1002/2014PA002657 10.1002

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:: Heinrich Stadial 1, Paleoceanography, 28, 663–674, doi:10.1002/2013PA002499. 1. Introduction [2] The

Dust, volcanic ash, and the evolution of the South Pacific Gyre through the Cenozoic

Creator:: Dunlea, Ann G., Murray, Richard W., Sauvage, Justine, Spivack, Arthur J., Harris, Robert N., and D'Hondt, Steven
Abstract:: We examine the 0–100 Ma paleoceanographic record retained in pelagic clay from the South Pacific Gyre (SPG) by analyzing 47 major, trace, and rare earth elements in bulk sediment in 206 samples from seven sites drilled during Integrated Ocean Drilling Program Expedition 329. We use multivariate statistical analyses (Q-mode factor analysis...
Resource Type:: Article
Full Text:: . Paleoceanography, 30(8), 1078-1099. doi:10.1002/2015PA002829 10.1002/2015PA002829 John Wiley & Sons, Inc

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:: flux and sediment focusing in the Panama Basin region during the last 30,000 years, Paleoceanography

The deglacial transition on the southeastern Alaska Margin: Meltwater input, sea level rise, marine productivity, and sedimentary anoxia

Creator:: Davies, M. H., Mix, A. C., Stoner, J. S., Addison, J. A., Jaeger, J., Finney, B., and Wiest, J.
Abstract:: Oxygen isotope data from planktonic and benthic foraminifera, on a high-resolution age model (44 ¹⁴C dates spanning 17,400 years), document deglacial environmental change on the southeast Alaska margin (59°33.32′N, 144°9.21′W, 682 m water depth). Surface freshening (i.e., δ¹⁸O reduction of 0.8‰) began at 16,650 ± 170 cal years B.P. during...
Resource Type:: Article
Full Text:: productivity, and sedimentary anoxia, Paleoceanography, 26, PA2223, doi:10.1029/2010PA002051. 1. Introduction

Eastern Pacific Warm Pool paleosalinity and climate variability: 0–30 kyr

Creator:: Benway, Heather M., Mix, Alan C., Haley, Brian A., and Klinkhammer, Gary P.
Abstract:: Multiproxy geologic records of δ18O and Mg/Ca in fossil foraminifera from sediments under the Eastern Pacific Warm Pool (EPWP) region west of Central America document variations in upper ocean temperature, pycnocline strength, and salinity (i.e., net precipitation) over the past 30 kyr. Although evident in the paleotemperature record, there is...
Resource Type:: Article
Full Text:: paleosalinity and climate variability: 0–30 kyr, Paleoceanography, 21, PA3008, doi:10.1029/2005PA001208. 1

ScholarsArchive@OSU

Planktonic foraminifera, sea surface temperatures, and mechanisms of oceanic change in the Peru and south equatorial currents, 0–150 ka BP

A new mechanism for Dansgaard-Oeschger cycles

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

Southern Ocean control of glacial AMOC stability and Dansgaard-Oeschger interstadial duration

Southwest Atlantic water mass evolution during the last deglaciation

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

Dust, volcanic ash, and the evolution of the South Pacific Gyre through the Cenozoic

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

The deglacial transition on the southeastern Alaska Margin: Meltwater input, sea level rise, marine productivity, and sedimentary anoxia

Eastern Pacific Warm Pool paleosalinity and climate variability: 0–30 kyr

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