noaa-ocean-10488
North Atlantic RAPiD Deglacial Paired Mg/Ca-d18O and d18Osw-SST Reconstructions
Thornalley, D.J.R.; McCave, I.N.; Elderfield, H.
North Atlantic RAPiD Deglacial Paired Mg/Ca-d18O and d18Osw-SST Reconstructions
2010-01-18
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/10488
Investigator
D.J.R.
Thornalley
Investigator
I.N.
McCave
Investigator
H.
Elderfield
earth science
paleoclimate
climate reconstructions|paleoceanography
depth at sample start,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
depth at sample end,null,null,centimeter,null,climate reconstructions|paleoceanography,null,null,N,null
earth science
paleoclimate
climate reconstructions|paleoceanography
age,null,null,calendar kiloyear before present,null,climate reconstructions|paleoceanography,null,null,N,present defined as 2000 CE
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,corrected,null,N,0.6 per mil subtracted
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globigerina bulloides,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,Globorotalia inflata,null,per mil VPDB,null,paleoceanography,null,null,N,corrected for ice volume
earth science
paleoclimate
paleoceanography
Neogloboquadrina pachyderma sinistral,null,null,percent,null,paleoceanography,null,null,N,150-250 microns
earth science
paleoclimate
paleoceanography
delta 18O,Globigerina bulloides,null,per mil VPDB,null,paleoceanography,null,null,N,corrected for ice volume
earth science
paleoclimate
climate reconstructions|paleoceanography
depth,null,null,centimeter,null,climate reconstructions|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,based on G. bulloides
earth science
paleoclimate
paleoceanography
ice rafted debris,null,null,count per gram,null,paleoceanography,null,null,N,excluding volcanics; 150-250 microns; count per gram of dry sediment + 1
earth science
paleoclimate
climate reconstructions|paleoceanography
sea water temperature,magnesium/calcium,null,degree Celsius,null,climate reconstructions|paleoceanography,null,null,N,based on G. inflata
earth science
paleoclimate
paleoceanography
delta 18O,Globorotalia inflata,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
magnesium/calcium,Globorotalia inflata,null,millimole per mole,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
geochemistry
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
reconstruction
geoscientificInformation
Sea Surface Temperature Reconstruction
abrupt climate change
21292 cal yr BP
7004 cal yr BP
Complete
62.08
62.2994
-17.82
-17.1344
-2133
-1938
Ocean
Atlantic Ocean
North Atlantic Ocean
RAPiD-12-1K>LATITUDE 62.08>LONGITUDE -17.82
Ocean
Atlantic Ocean
North Atlantic Ocean
RAPiD-15-4P>LATITUDE 62.2994>LONGITUDE -17.1344
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
Thornalley, D.J.R., I.N. McCave, and H. Elderfield. 2010.
Freshwater input and abrupt deglacial climate change
in the North Atlantic.
Paleoceanography, 25, PA1201, doi:10.1029/2009PA001772.
Greenland ice core records indicate that the last deglaciation
(~7-21 ka) was punctuated by numerous abrupt climate reversals
involving temperature changes of up to 5°C-10°C within decades.
However, the cause behind many of these events is uncertain.
A likely candidate may have been the input of deglacial meltwater,
from the Laurentide ice sheet (LIS), to the high-latitude North
Atlantic, which disrupted ocean circulation and triggered cooling.
Yet the direct evidence of meltwater input for many of these
events has so far remained undetected. In this study, we use
the geochemistry (paired Mg/Ca-d18O) of planktonic foraminifera
from a sediment core south of Iceland to reconstruct the input
of freshwater to the northern North Atlantic during abrupt
deglacial climate change. Our record can be placed on the same
timescale as ice cores and therefore provides a direct comparison
between the timing of freshwater input and climate variability.
Meltwater events coincide with the onset of numerous cold intervals,
including the Older Dryas (14.0 ka), two events during the Allerød
(at ~13.1 and 13.6 ka), the Younger Dryas (12.9 ka), and the 8.2 ka
event, supporting a causal link between these abrupt climate changes
and meltwater input. During the Bølling-Allerød warm interval,
we find that periods of warming are associated with an increased
meltwater flux to the northern North Atlantic, which in turn induces
abrupt cooling, a cessation in meltwater input, and eventual climate
recovery. This implies that feedback between climate and meltwater
input produced a highly variable climate. A comparison to published
data sets suggests that this feedback likely included fluctuations
in the southern margin of the LIS causing rerouting of LIS meltwater
between southern and eastern drainage outlets, as proposed by
Clark et al. (2001).
STUDY NOTES: Paired Mg/Ca and d18O measurements from foraminifera plus
reconstructed d18Oseawater and SST from RAPiD cores collected
in the North Atlantic south of Iceland.
Data collected by David J.R. Thornalley (Univ. of Cambridge)
Principal Investigator: I. Nick McCave (Univ. of Cambridge)
Cruise CD-159, funded by UK RAPID program
Stable isotope values relative to VPDB standard,
run in Godwin Laboratory, Univ. of Cambridge
Temperature calculated using Mg/Ca = B exp (0.1 × T)
B = 0.794 and 0.675 for G. bulloides and G. inflata, respectively
d18Osw calculated using Kim and O'Neil (1997),
including a 0.6‰ offset for G. bulloides,
and VPDB to SMOW conversion of 0.27‰
"Ice-volume corrected" for whole ocean changes using Fairbanks (1989)
sea-level curve, assuming a LGM to late Holocene shift of 1 ‰
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010/thornalley2010.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/thornalley2010/thornalley2010.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11