noaa-ocean-13668
Arctic Ocean 50KYr Ostracod Mg/Ca-Sr/Ca Intermediate Water Paleotemperatures
Cronin, T.M.; Dwyer, G.S.; Farmer, J.R.; Bauch, H.A.; Spielhagen, R.F.; Jakobsson, M.; Nilsson, J.; Briggs, W.M.; Stepanova, A.
Arctic Ocean 50KYr Ostracod Mg/Ca-Sr/Ca Intermediate Water Paleotemperatures
2012-12-19
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13668
Investigator
T.M.
Cronin
Investigator
G.S.
Dwyer
Investigator
J.R.
Farmer
Investigator
H.A.
Bauch
Investigator
R.F.
Spielhagen
Investigator
M.
Jakobsson
Investigator
J.
Nilsson
Investigator
W.M.
Briggs
Investigator
A.
Stepanova
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,PS1243-Species glac= K. glacialis min= K. minima
earth science
paleoclimate
climate reconstructions|paleoceanography
sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,bottom water temperature
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
sodium/calcium,ostracod,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
strontium/calcium,ostracod,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,PS1243-MgGlac&Min-Corr for Krithe minima corrected for species effect (0.77 x original Mg/Ca ratio)
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Krithe Species
earth science
paleoclimate
paleoceanography
magnesium/calcium,ostracod,null,millimole per mole,null,paleoceanography,corrected,null,N,corrected for species effect (0.77 x original Mg/Ca ratio)
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Krithe Species glac= K. glacialis min= K. minima
earth science
paleoclimate
paleoceanography
collection water depth,null,null,meter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,PS1243 Age
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,PS1243-3-PtSmooth
earth science
paleoclimate
paleoceanography
magnesium/calcium,ostracod,null,millimole per mole,null,paleoceanography,smoothed,null,N,null
earth science
paleoclimate
paleoceanography
strontium/calcium,ostracod,null,millimole per mole,null,paleoceanography,smoothed,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,N,Visual Preservation Index: 1 = translucent best preservation 7 = chalky worst preservation
earth science
paleoclimate
paleoceanography
magnesium/calcium,ostracod,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Core Name Central Arctic Composite Core
earth science
paleoclimate
paleoceanography
notes,null,null,null,null,paleoceanography,null,null,C,Core Name
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Arctic
50000 cal yr BP
0 cal yr BP
Complete
69.38
88.87
-170.5
140.18
-2710
-528
Ocean
Arctic Ocean
Chukchi Sea
Pl-94AR-BC06B>LATITUDE 75.35>LONGITUDE -170.5
Ocean
Arctic Ocean
Pl-94AR-BC28>LATITUDE 88.87>LONGITUDE 140.18
Ocean
Arctic Ocean
PS1243-1/2>LATITUDE 69.38>LONGITUDE -6.53
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
T.M. Cronin, G.S. Dwyer, J. Farmer, H.A. Bauch, R.F. Spielhagen, M. Jakobsson, J. Nilsson, W.M. Briggs Jr and A. Stepanova. 2012.
Deep Arctic Ocean warming during the last glacial cycle.
Nature Geoscience, Vol. 5, No. 9, pp. 631-634.
DOI: 10.1038/ngeo1557
In the Arctic Ocean, the cold and relatively fresh water beneath the sea ice is separated from the underlying warmer and saltier Atlantic Layer by a halocline. Ongoing sea ice loss and warming in the Arctic Ocean have demonstrated the instability of the halocline, with implications for further sea ice loss. The stability of the halocline through past climate variations is unclear. Here we estimate intermediate water temperatures over the past 50,000 years from the Mg/Ca and Sr/Ca values of ostracods from 31 Arctic sediment cores. From about 50 to 11 kyr ago, the central Arctic Basin from 1,000 to 2,500 m was occupied by a water mass we call Glacial Arctic Intermediate Water. This water mass was 1-2°C warmer than modern Arctic Intermediate Water, with temperatures peaking during or just before millennial-scale Heinrich cold events and the Younger Dryas cold interval. We use numerical modelling to show that the intermediate depth warming could result from the expected decrease in the flux of fresh water to the Arctic Ocean during glacial conditions, which would cause the halocline to deepen and push the warm Atlantic Layer into intermediate depths. Although not modelled, the reduced formation of cold, deep waters due to the exposure of the Arctic continental shelf could also contribute to the intermediate depth warming.
STUDY NOTES: Quaternary Arctic Ocean Ostracode Mg/Ca and Sr/Ca ratios and Paleotemperature estimates
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/cronin2012/cronin2012bwt.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/cronin2012/cronin2012mgca.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11