noaa-ocean-5592
Eastern Equatorial Pacific Deglacial Atmospheric Dust Flux Data
McGee, D.; Marcantonio, F.; Lynch-Stieglitz, J.
Eastern Equatorial Pacific Deglacial Atmospheric Dust Flux Data
2007-07-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5592
Investigator
D.
McGee
Investigator
F.
Marcantonio
Investigator
J.
Lynch-Stieglitz
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
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
cal yr BP
cal yr BP
Complete
-2.98
7.2
-110.57
-109.75
-3860
-3714
Ocean
Pacific Ocean
North Pacific Ocean
ODP 852A>LATITUDE 5.28>LONGITUDE -110.07
Ocean
Pacific Ocean
South Pacific Ocean
ODP 848B>LATITUDE -2.98>LONGITUDE -110.47
Ocean
Pacific Ocean
North Pacific Ocean
ODP 849A>LATITUDE .17>LONGITUDE -110.52
Ocean
Pacific Ocean
North Pacific Ocean
ODP 853B>LATITUDE 7.2>LONGITUDE -109.75
Ocean
Pacific Ocean
North Pacific Ocean
ODP 850A>LATITUDE 1.3>LONGITUDE -110.52
Ocean
Pacific Ocean
North Pacific Ocean
ODP 851E>LATITUDE 2.77>LONGITUDE -110.57
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
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.
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.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp849a-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp848b-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp852a-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp851e-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp850a-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleocean/sediment_files/complete/odp853b-tab.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/mcgee2007
USA/NOAA
DIF
Version 9.8.4
2019-04-29
2019-04-29