noaa-ocean-10891
Emerald Basin MC-29D 1600 Year Multiproxy Sediment Data
Keigwin, L.D.; Sachs, J.P.; Rosenthal, Y.
Emerald Basin MC-29D 1600 Year Multiproxy Sediment Data
2011-04-22
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10891
Investigator
L.D.
Keigwin
Investigator
J.P.
Sachs
Investigator
Y.
Rosenthal
earth science
paleoclimate
paleoceanography
alkenone,sediment,null,parts per billion,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,Neogloboquadrina pachyderma,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,calendar year before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,benthic foraminifer,null,per mil,null,paleoceanography,averaged,null,N,Cibicidoides lobatulus
earth science
paleoclimate
paleoceanography
delta 18O,Neogloboquadrina pachyderma,null,per mil,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,alkenone unsaturation index,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,on Cibicidoides sp.
earth science
paleoclimate
paleoceanography
delta 13C,benthic foraminifer,null,per mil,null,paleoceanography,averaged,null,N,Cibicidoides lobatulus
earth science
paleoclimate
paleoceanography
Neogloboquadrina pachyderma,null,null,percent,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,benthic foraminifer,null,dimensionless,null,paleoceanography,averaged,null,N,Cibicidoides lobatulus
earth science
paleoclimate
paleoceanography
magnesium/calcium,Cibicidoides pachyderma,null,dimensionless,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)
Sea Surface Temperature Reconstruction
1599 cal yr BP
0 cal yr BP
Complete
45.885
45.885
-62.795
-62.795
-250
-250
Ocean
Atlantic Ocean
North Atlantic Ocean
MC-29>LATITUDE 45.885>LONGITUDE -62.795
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
Keigwin, L.D., J.P. Sachs, and Y. Rosenthal. 2003.
A 1600-year history of the Labrador Current off Nova Scotia.
Climate Dynamics, Vol. 21, pp. 53-62.
DOI: 10.1007/s00382-003-0316-6
A multicore from Emerald Basin, on the continental margin off
Nova Scotia, has a modern 14C age at the top, and other 14C dates
indicate a linear sedimentation rate of ~30 cm/ka to 1600 calendar
years BP. This rate is great enough to record century-to-millennial
scale changes in the surface and deep (~250 m) waters in the basin
that are influenced by the Labrador Current. We applied five proxies
for seawater temperature changes to the sediments of Emerald Basin,
including the percent abundance and the oxygen isotope ratio (d18O)
of the polar planktonic foraminifer N. pachyderma (s.), the
unsaturation ratio of alkenones (Uk'37) produced by prymnesiophyte
phytoplankton, and the d18O and Mg/Ca of benthic foraminifera.
All five proxies indicate the ocean warmed suddenly sometime in
the past 150 years or so. The exact timing of this event is
uncertain because 14C dating is inaccurate in recent centuries,
but this abrupt warming probably correlates with widespread evidence
for warming in the Arctic in the nineteenth century. Because the
Canadian Archipelago is one of the two main sources for the Labrador
Current, warming and melting of ice caps in that region may have
affected Labrador Current properties. Before this recent warming,
sea surface temperature was continually lower by 1-2°C, and bottom
water was colder by about 6°C in Emerald Basin. These results suggest
that there was no Medieval Warm Period in the coastal waters off
Nova Scotia. Because there is also no evidence of medieval warming
in the Canadian archipelago, it seems likely that coastal waters
from Baffin Bay to at least as far south as Nova Scotia were
continually cold for ~1500 of the past 1600 years.
STUDY NOTES: High resolution multiproxy sediment data from Emerald Basin,
offshore Nova Scotia, Canada covering the last 1600 years.
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2003/keigwin2003.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/keigwin2003/keigwin2003.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11