noaa-ocean-15068
Caribbean Sea Nitrogen Isotope Data From ODP999 Over the Last 160,000 Years
Straub, M.; Sigman, D.M.; Ren, H.; Martínez-Garcia, A.; Meckler, A.N.; Hain, M.P.; Haug, G.H.
Caribbean Sea Nitrogen Isotope Data From ODP999 Over the Last 160,000 Years
2013-09-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/15068
Investigator
M.
Straub
Investigator
D.M.
Sigman
Investigator
H.
Ren
Investigator
A.
Martínez-Garcia
Investigator
A.N.
Meckler
Investigator
M.P.
Hain
Investigator
G.H.
Haug
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 15N,Globigerinoides ruber,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 15N,Globigerinoides ruber|Trilobatus sacculifer,null,per mil,null,paleoceanography,averaged,null,N,null
earth science
paleoclimate
paleoceanography
delta 15N,Trilobatus sacculifer,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
nitrogen isotopes
geoscientificInformation
157450 cal yr BP
4020 cal yr BP
Complete
12.75
12.75
-78.73
-78.73
-2827
-2827
Ocean
Pacific Ocean
North Pacific Ocean
ODP 999A>LATITUDE 12.75>LONGITUDE -78.73
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
Straub, M., D.M. Sigman, H. Ren, A. Martínez-García, A.N. Meckler, M.P. Hain and G.H. Haug. 2013. Changes in North Atlantic nitrogen fixation controlled by ocean circulation. Nature, 501, 200-203. doi:10.1038/nature12397
In the ocean, the chemical forms of nitrogen that are readily available for biological use (known collectively as ‘fixed’ nitrogen) fuel the global phytoplankton productivity that exports carbon to the deep ocean. Accordingly, variation in the oceanic fixed nitrogen reservoir has been proposed as a cause of glacial–interglacial changes in atmospheric carbon dioxide concentration. Marine nitrogen fixation, which produces most of the ocean’s fixed nitrogen, is thought to be affected by multiple factors, including ocean temperature and the availability of iron and phosphorus. Here we reconstruct changes in North Atlantic nitrogen fixation over the past 160,000 years from the shell-bound nitrogen isotope ratio (15N/14N) of planktonic foraminifera in Caribbean Sea sediments. The observed changes cannot be explained by reconstructed changes in temperature, the supply of (iron-bearing) dust or water column denitrification. We identify a strong, roughly 23,000-year cycle in nitrogen fixation and suggest that it is a response to orbitally driven changes in equatorial Atlantic upwelling, which imports ‘excess’ phosphorus (phosphorus in stoichiometric excess of fixed nitrogen) into the tropical North Atlantic surface. In addition, we find that nitrogen fixation was reduced during glacial stages 6 and 4, when North Atlantic Deep Water had shoaled to become glacial North Atlantic intermediate water, which isolated the Atlantic thermocline from excess phosphorus-rich mid-depth waters that today enter from the Southern Ocean. Although modern studies have yielded diverse views of the controls on nitrogen fixation, our palaeobiogeochemical data suggest that excess phosphorus is the master variable in the North Atlantic Ocean and indicate that the variations in its supply over the most recent glacial cycle were dominated by the response of regional ocean circulation to the orbital cycles.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/straub2013-nat/straub2013-nature.txt
USA/NOAA
DIF
Version 9.8.4
2019-06-07
2019-06-07