@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 {59,
	title = {Late Holocene sedimentation in a high Arctic coastal setting: Simpson Lagoon and Colville Delta, Alaska},
	journal = {Continental Shelf Research},
	volume = {74},
	year = {2014},
	pages = {11-24},
	abstract = {Arctic coastal environments near major river outfalls, like Simpson Lagoon, Alaska and the adjacent Colville River Delta, potentially contain high-resolution sediment records useful in elucidating late Holocene Arctic sediment transport pathways and coupled terrestrial-ocean evidence of paleoclimate variability. This study utilizes a multi-tracer geochronology approach (137Cs, 239,240Pu, and 14C) tailored for high-latitude environments to determine the age models for cores collected from Simpson Lagoon, and to date seismic boundaries in shallow acoustic reflection data (CHIRP) to examine late Holocene infill patterns. Modern (~100 y) sediment accumulation rates range from 5 m of late Holocene interbedded sediments, likely derived primarily from the Colville River, with onset of accumulation occurring prior to ~3500 y BP. A paleo-high in central Simpson Lagoon, separating the two depocenters, was subaerially exposed prior to ~600 y BP. The millimeters-per-year sedimentation rates across the lagoon, coupled with the undisturbed, interbedded sediment record, indicate that these settings hold great potential to develop new Arctic paleoenvironmental records.},
	issn = {0278-4343},
	doi = {10.1016/j.csr.2013.11.026},
	url = {http://www.sciencedirect.com/science/article/pii/S0278434313004056},
	author = {Hanna, Andrea J. M. and Allison, Mead A. and Bianchi, Thomas S. and Marcantonio, Franco and Goff, John A.}
}
@article {2456,
	title = {Particle sorting during sediment redistribution processes and the effect on <sup>230</sup>               Th-normalized mass accumulation rates},
	journal = {Geophysical Research Letters},
	volume = {41},
	year = {2014},
	month = {Apr-08-2015},
	pages = {5547 - 5554},
	abstract = {The 230Th method of determining mass accumulation rates (MARs) assumes that little to no fractionation occurs during sediment redistribution processes at the seafloor. We examine 230Th inventories in radiocarbon-dated multicore sediments from paired winnowed and focused sites at Cocos and Carnegie Ridges, Panama Basin. Radiocarbon-derived sand MARs, which likely represent the vertical rain of particles poorly transported by bottom currents, are similar at each of the paired sites but are different using 230Th normalization. 230Th-normalized MARs are about 60\% lower at focused sites and likely underestimate vertical MARs, while the reverse is true for winnowed sites. We hypothesize that size fractionation occurs most frequently at lower current velocities, resulting in the coarse fraction being left behind and primarily the fine 230Th-rich grains being transported downslope. 230Th-normalization works well for recording fine-grained (detrital and opal), but not coarse-grained (carbonate), fluxes in regions that have undergone sediment redistribution.},
	doi = {10.1002/2014GL060477},
	url = {http://doi.wiley.com/10.1002/2014GL060477https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002\%2F2014GL060477},
	author = {Marcantonio, Franco and Lyle, Mitchell and Ibrahim, Rami}
}
@article {2455,
	title = {A 28-ka history of sea surface temperature, primary productivity and planktonic community variability in the western Arabian Sea},
	journal = {Paleoceanography},
	volume = {22},
	year = {2007},
	month = {Jan-12-2007},
	pages = {n/a - n/a},
	abstract = {Uranium series radionuclides and organic biomarkers, which represent major groups of planktonic organisms, were measured in western Arabian Sea sediments that span the past 28 ka. Variability in the past strength of the southwest and northeast monsoons and its influence on primary productivity, sea surface temperature (SST), and planktonic community structure were investigated. The average alkenone-derived SST for the last glacial period was \~{}3{\textdegree}C lower than that measured for the Holocene. Prior to the deglacial, the lowest SSTs coincide with the highest measured fluxes of organic biomarkers, which represent primarily a planktonic suite of diatoms, coccolithophorids, dinoflagellates, and zooplankton. We propose that intensification of winter northeast monsoon winds during the last glacial period resulted in deep convective mixing, cold SSTs and enhanced primary productivity. In contrast, postdeglacial (<17 ka) SSTs are warmer during times in which biomarker fluxes are high. Associated with this transition is a planktonic community structure change, in which the ratio of the average cumulative flux of diatom biomarkers to the cumulative flux of coccolithophorid biomarkers is twice as high during the deglacial and Holocene than the average ratio during the last glacial period. We suggest that this temporal transition represents a shift from a winter northeast monsoon-dominated (pre-17 ka) to a summer southwest monsoon-dominated (post-17 ka) wind system.},
	doi = {10.1029/2007PA001502},
	url = {http://doi.wiley.com/10.1029/2007PA001502https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029\%2F2007PA001502},
	author = {Pourmand, Ali and Marcantonio, Franco and Bianchi, Thomas S. and Canuel, Elizabeth A. and Waterson, Elizabeth J.}
}
