@article {2810,
	title = {Deep Equatorial Pacific Ocean Oxygenation and Atmospheric CO2 Over The Last Ice Age},
	journal = {Scientific Reports},
	volume = {10},
	year = {2020},
	month = {Jan-12-2020},
	abstract = {Ventilation of carbon stored in the deep ocean is thought to play an important role in atmospheric CO2 increases associated with Pleistocene deglaciations. The presence of this respired carbon has been recorded by an array of paleoceanographic proxies from various locations across the global ocean. Here we present a new sediment core from the Eastern Equatorial Pacific (EEP) Ocean spanning the last 180,000 years and reconstruct high-resolution 230Th-derived fluxes of 232Th and excess barium, along with redox-sensitive uranium concentrations to examine past variations in dust delivery, export productivity, and bottom-water oxygenation, respectively. Our bottom-water oxygenation record is compared to other similar high-resolution records from across the Pacific and in the Southern Ocean. We suggest that the deep Pacific is a site of respired carbon storage associated with periods of decreased global atmospheric CO2 concentration during the LGM, confirming the conclusions from a wealth of previous studies. However, our study is the first to show a similar relationship beyond the last glacial, extending to at least 70,000 years},
	doi = {10.1038/s41598-020-63628-x},
	url = {http://www.nature.com/articles/s41598-020-63628-x},
	author = {Marcantonio, Franco and Hostak, Ryan and Hertzberg, Jennifer E. and Schmidt, Matthew W.}
}
@article {2809,
	title = {Millennial-scale iron fertilization of the eastern equatorial Pacific over the past 100,000 years},
	journal = {Nature Geoscience},
	volume = {10},
	year = {2017},
	month = {Jan-10-2017},
	pages = {760 - 764},
	abstract = {The eastern equatorial Pacific Ocean plays a crucial role in global climate, as it is a substantial source of CO2 to the atmosphere and accounts for a significant portion of global new export productivity. Here we present a 100,000-year sediment core from the eastern equatorial Pacific, and reconstruct dust flux, export productivity and bottom-water oxygenation using excess-230Th-derived fluxes of 232Th and barium, and authigenic uranium concentrations, respectively. We find that during the last glacial period (71,000 to 41,000 years ago), increased delivery of dust to the eastern equatorial Pacific was coeval with North Atlantic Heinrich stadial events. Millennial-scale pulses of increased dust flux coincided with episodes of heightened biological productivity, suggesting that dissolution of dust released iron that promoted ocean fertilization. We also find that periods of low atmospheric CO2 concentrations were associated with suboxic conditions and increased storage of respired carbon in the deep eastern equatorial Pacific. Increases in CO2 concentrations during the deglaciation are coincident with increases in deep Pacific and Southern Ocean water oxygenation levels. We suggest that deep-ocean ventilation was a primary control on CO2 outgassing in this region, with superimposed pulses of high productivity providing a negative feedback.},
	issn = {1752-0894},
	doi = {10.1038/ngeo3024},
	url = {http://www.nature.com/articles/ngeo3024},
	author = {Loveley, Matthew R. and Marcantonio, Franco and Wisler, Marilyn M. and Hertzberg, Jennifer E. and Schmidt, Matthew~W. and Lyle, Mitchell}
}
@article {2457,
	title = {Comparison of eastern tropical Pacific TEX 86  and  Globigerinoides ruber  Mg/Ca derived sea surface temperatures: Insights from the Holocene and Last Glacial Maximum},
	journal = {Earth and Planetary Science Letters},
	volume = {434},
	year = {2016},
	month = {Jan-01-2016},
	pages = {320 - 332},
	abstract = {The use of the TEX86TEX86 temperature proxy has thus far come to differing results as to whether TEX86TEX86 temperatures are representative of surface or subsurface conditions. In addition, although TEX86TEX86 temperatures might reflect sea surface temperatures based on core-top (Holocene) values, this relationship might not hold further back in time. Here, we investigate the TEX86TEX86 temperature proxy by comparing TEX86TEX86 temperatures to Mg/Ca temperatures of multiple species of planktonic foraminifera for two sites in the eastern tropical Pacific (on the Cocos and Carnegie Ridges) across the Holocene and Last Glacial Maximum. Core-top and Holocene View the MathML sourceTEX86H temperatures at both study regions agree well, within error, with the Mg/Ca temperatures of Globigerinoides ruber  , a surface dwelling planktonic foraminifera. However, during the Last Glacial Maximum, View the MathML sourceTEX86H temperatures are more representative of upper thermocline temperatures, and are offset from G. ruber   Mg/Ca temperatures by 5.8 {\textdegree}C and 2.9 {\textdegree}C on the Cocos Ridge and Carnegie Ridge, respectively. This offset between proxies cannot be reconciled by using different TEX86TEX86 temperature calibrations, and instead, we suggest that the offset is due to a deeper export depth of GDGTs at the LGM. We also compare the degree of glacial cooling at both sites based on both temperature proxies, and find that View the MathML sourceTEX86H temperatures greatly overestimate glacial cooling, especially on the Cocos Ridge. This study has important implications for applying the TEX86TEX86 paleothermometer in the eastern tropical Pacific.},
	keywords = {Foraminifera, Holocene, LGM; Pacific Ocean, Mg/Ca, TEX86TEX86},
	issn = {0012821X},
	doi = {10.1016/j.epsl.2015.11.050},
	url = {http://linkinghub.elsevier.com/retrieve/pii/S0012821X15007542http://api.elsevier.com/content/article/PII:S0012821X15007542?httpAccept=text/xmlhttp://api.elsevier.com/content/article/PII:S0012821X15007542?httpAccept=text/plain},
	author = {Hertzberg, Jennifer E. and Schmidt, Matthew W. and Bianchi, Thomas S. and Smith, Richard W. and Shields, Michael R. and Marcantonio, Franco}
}
@article {2569,
	title = {Glacial-interglacial changes in central tropical Pacific surface seawater property gradients},
	journal = {Paleoceanography},
	volume = {30},
	year = {2015},
	month = {Jan-05-2015},
	pages = {423 - 438},
	abstract = {Much uncertainty exists about the state of the oceanic and atmospheric circulation in the tropical Pacific over the last glacial cycle. Studies have been hampered by the fact that sediment cores suitable for study were concentrated in the western and eastern parts of the tropical Pacific, with little information from the central tropical Pacific. Here we present information from a suite of sediment cores collected from the Line Islands Ridge in the central tropical Pacific, which show sedimentation rates and stratigraphies suitable for paleoceanographic investigations. Based on the radiocarbon and oxygen isotope measurements on the planktonic foraminifera Globigerinoides ruber, we construct preliminary age models for selected cores and show that the gradient in the oxygen isotope ratio of G. ruber between the equator and 8{\textdegree}N is enhanced during glacial stages relative to interglacial stages. This stronger gradient could reflect enhanced equatorial cooling (perhaps reflecting a stronger Walker circulation) or an enhanced salinity gradient (perhaps reflecting increased rainfall in the central tropical Pacific).},
	doi = {10.1002/2014PA002746},
	url = {http://doi.wiley.com/10.1002/2014PA002746},
	author = {Lynch-Stieglitz, Jean and Polissar, Pratigya J. and Jacobel, Allison W. and Hovan, Steven A. and Pockalny, Robert A. and Lyle, Mitchell and Murray, Richard W. and Ravelo, A. Christina and Bova, Samantha C. and Dunlea, Ann G. and Ford, Heather L. and Hertzberg, Jennifer E. and Wertman, Christina A. and Maloney, Ashley E. and Shackford, Julia K. and Wejnert, Katherine and Xie, Ruifang C.}
}
