Eastern Equatorial Pacific Deglacial Atmospheric Dust Flux Data McGee, D.; Marcantonio, F.; Lynch-Stieglitz, J. McGee, D. Marcantonio, F. Lynch-Stieglitz, J. earth science/paleoclimate/paleoceanography (delta 13C,Trilobatus sacculifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (delta 18O,Trilobatus sacculifer,null,per mil PDB,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (232Th,sediment,null,parts per billion,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (238U,sediment,null,parts per billion,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (depth,null,null,centimeter,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleoceanography (230Th,sediment,null,parts per billion,null,paleoceanography,null,null,N,null) earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean earth science/paleoclimate/paleocean (ODP 852A>LATITUDE 5.28>LONGITUDE -110.07) (ODP 848B>LATITUDE -2.98>LONGITUDE -110.47) (ODP 849A>LATITUDE .17>LONGITUDE -110.52) (ODP 853B>LATITUDE 7.2>LONGITUDE -109.75) (ODP 850A>LATITUDE 1.3>LONGITUDE -110.52) (ODP 851E>LATITUDE 2.77>LONGITUDE -110.57) Atmospheric dust levels may play important roles in feedbacks linking continental source areas, tropical convection, marine productivity, and global climate. These feedbacks appear to be particularly significant in the tropical Pacific, where variations in local convection and productivity have been demonstrated to have impacts on climate at higher latitudes. Modeling of past dust levels and related feedbacks has been limited, however, by a paucity of observational data. In this study we present a temporal and spatial survey of dust fluxes to the eastern equatorial Pacific over the past 30 kyr. Glacial and Holocene fluxes of 232Th, a proxy for continental material, were calculated by normalization to 230Th from a northŋsouth transect of cores along 110°W between 3°S and 7°N (ODP sites 848ŋ853). Fluxes were 30ŋ100% higher during the last glacial, suggesting increased dustiness in both hemispheres during the glacial period. In both time periods, dust fluxes decrease towards the south, reflecting scavenging of Northern Hemisphere dust by precipitation at the ITCZ. The Holocene meridional dust flux gradient between 7°N and 3°S is characterized by a steep drop in dust levels at the southern edge of the modern range of the ITCZ, while the gradient is shallower and more nearly linear during the last glacial. This change may indicate that the glacial ITCZ in this region was a less effective barrier to inter-hemispheric dust transport, most likely due to a decrease in convective intensity and precipitation during the last glacial; alternatively, the change in gradient may be explained by increased variability in the location of the glacial ITCZ. Our data do not appear to require a mean southerly displacement of the glacial ITCZ, as suggested by the results of other studies. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : McGee, D. Investigator : Marcantonio, F. Investigator : Lynch-Stieglitz, J. 2007-07-01 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/5592 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp849a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp848b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp852a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp851e-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp850a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp853b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcgee2007 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp849a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp848b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp852a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp851e-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp850a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp853b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcgee2007 English https://www.ncdc.noaa.gov/paleo/study/5592 https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp849a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp848b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp852a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp851e-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp850a-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp853b-tab.txt https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcgee2007 McGee, D., F. Marcantonio, and J. Lynch-Stieglitz. 2007. Deglacial changes in dust flux in the eastern equatorial Pacific. Earth and Planetary Science Letters, 257(1-2), 215-230. -110.57 -2.98 -109.75 7.2