noaa-ocean-13498
Brazil Margin LGM-Holocene Benthic Stable Isotope Data
Hoffman, J.L.; Lund, D.C.
Brazil Margin LGM-Holocene Benthic Stable Isotope Data
2012-11-06
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13498
Investigator
J.L.
Hoffman
Investigator
D.C.
Lund
earth science
paleoclimate
paleoceanography
delta 13C,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Cibicidoides sp.,null,per mil PDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
Meridional Overturning Circulation (MOC)
22935 cal yr BP
330 cal yr BP
Complete
-29.7833
-27.7667
-46.0333
-43.3333
-4003
-2296
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-5-42JPC>LATITUDE -27.7667>LONGITUDE -46.0333
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-5-120GGC>LATITUDE -28.5833>LONGITUDE -45.2333
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-5-125GGC>LATITUDE -29.5333>LONGITUDE -45.0833
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-5-54GGC>LATITUDE -29.5333>LONGITUDE -43.3333
Ocean
Atlantic Ocean
South Atlantic Ocean
KNR159-5-22GGC>LATITUDE -29.7833>LONGITUDE -43.5833
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
Hoffman, J.L. and D.C. Lund. 2012.
Refining the stable isotope budget for Antarctic Bottom Water: New foraminiferal data from the abyssal southwest Atlantic.
Paleoceanography, 27, PA1213.
doi: 10.1029/2011PA002216
Stable isotope tracer budget results suggest the transport to vertical diffusivity ratio for Antarctic Bottom Water (AABW) in the Atlantic was higher at the Last Glacial Maximum (LGM). Reduced mixing across the upper boundary of AABW is consistent with movement of this surface away from the seafloor and may be a factor in sequestering CO2 in the abyssal Atlantic. Two key unknowns in the budget are the isotopic composition of AABW and the spatial representativeness of isolated vertical profiles of d18O and d13C. Due to a lack of core material below 3 km water depth, Lund et al. (2011) based their Holocene budget on water column data and their LGM budget on extrapolation of isotopic trends from shallower cores. Here we determine d18O and d13C for AABW using new isotopic records from 3 to 4 km water depth at the Brazil Margin. The core top data yield tracer budget parameters consistent with water column data in the broader Southwest Atlantic. At the LGM, benthic d18O reaches 4.9‰ at 4 km water depth, the highest LGM d18O value in the published literature. The corresponding d13C of -0.2‰ is less depleted than expected and >0.5‰ greater than d13C in the Southeast Atlantic. Our Peclet number estimates suggest d13C acted conservatively during both the Holocene and LGM. Both d18O and d13C imply the transport to vertical diffusivity ratio for AABW was an order of magnitude larger during the LGM, due to enhanced AABW transport or reduced mixing across its upper boundary.
STUDY NOTES: The files include age model and stable isotopic data for KNR159-5-42JPC, 125GGC, 22GGC, and 54GGC.
Only stable isotopic data are available for 120GGC.
All calendar ages are based on the MARINE09 calibration curve assuming a deltaR of 0±200 years (1sigma For details see Hoffman and Lund (2012).
In the stable isotopic data benthic d13C and benthic d18O are reported per mil VPDB. Isotopic measurements were based on individual tests of Cibicidoides spp. Bioturbated samples are noted where appropriate. Note that the isotopic data for KNR159-5-42JPC were initially published by Curry and Oppo (2005).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012jpc42.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc125.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc120.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc54.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/hoffman2012/hoffman2012ggc22.txt
USA/NOAA
DIF
Version 9.8.4
2019-06-06
2019-06-06