noaa-ocean-13214
Orca Basin MD02-2550 Deglacial Paired Mg/Ca, d18O, and d18Osw
Williams, C.; Flower, B.P.; Hastings, D.W.
Orca Basin MD02-2550 Deglacial Paired Mg/Ca, d18O, and d18Osw
2012-08-14
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/13214
Investigator
C.
Williams
Investigator
B.P.
Flower
Investigator
D.W.
Hastings
earth science
paleoclimate
paleoceanography
age,null,null,calendar kiloyear before present,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerinoides ruber white,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,using G. ruber white correction
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerinoides ruber pink,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerinoides ruber white,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,G. ruber white
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,ice-volume corrected; G. ruber white
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,null,null,N,G. ruber pink
earth science
paleoclimate
climate reconstructions|paleoceanography
sea surface temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,using G. ruber pink correction
earth science
paleoclimate
paleoceanography
delta 18O,Globigerinoides ruber pink,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
delta 18O,delta 18O|magnesium/calcium|sea water,null,per mil VSMOW,null,climate reconstructions|paleoceanography,corrected,null,N,ice-volume corrected; G. ruber pink
earth science
paleoclimate
paleoceanography
depth,null,null,centimeter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
geoscientificInformation
18378 cal yr BP
10731 cal yr BP
Complete
26.9463
26.9463
-91.3458
-91.3458
-2248
-2248
Ocean
Atlantic Ocean
North Atlantic Ocean
Gulf Of Mexico
MD02-2550>LATITUDE 26.9463>LONGITUDE -91.3458
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
Williams, C., B.P. Flower, and D.W. Hastings. 2012.
Seasonal Laurentide Ice Sheet melting during the "Mystery Interval"
(17.5-14.5 ka).
Geology, First published on August 9, 2012.
doi:10.1130/G33279.1
The last deglaciation in the Northern Hemisphere was interrupted
by two major stadials, the so-called "Mystery Interval" (17.5-14.5 ka)
and the Younger Dryas (12.9-11.7 ka). During these events, the North
Atlantic region was marked by cold surface conditions, yet simultaneous
glacier and snowline retreat. Rerouting of Laurentide Ice Sheet
meltwater from the Gulf of Mexico to an eastern or northern spillway
may have reduced meridional overturning circulation at the onset of
the Younger Dryas. However, this hypothesis has not been tested for
the Mystery Interval. Paired Mg/Ca and 18O measurements on foraminifera
from laminated Orca Basin sediments in the Gulf of Mexico, constrained
by 35 14C dates, document the timing of meltwater input with
subcentennial resolution. Isolating the 18O of seawater (termed 18OGOM)
reveals three major melting episodes from ca. 17.5 ka until 12.9 ka,
followed by a rapid cessation, consistent with meltwater rerouting
at the onset of the Younger Dryas. Conversely, inferred meltwater
flow to the Gulf of Mexico during the Mystery Interval does not
support a simple routing event, but is consistent with glacier
and snowline retreat. We suggest that summer melting of Northern
Hemisphere ice sheets during this stadial may have been an important
mechanism for enhanced winter sea-ice formation, hypercold winter
conditions, and enhanced seasonality in the North Atlantic region.
STUDY NOTES: High resolution foraminiferal (Globigerinoides ruber) d18OGOM
(ice-volume corrected d18Osw) data from the Orca Basin,
in the northern Gulf of Mexico, are used to reconstruct
Laurentide Ice Sheet meltwater input during the last deglaciation.
Core MD02-2550, Orca Basin, northern Gulf of Mexico:
26°56.78'N, 91°20.75'W, water depth 2248m
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/williams2012/williams2012.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/williams2012/williams2012.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11