noaa-lake-5475
Deep Lake Minnesota 12,000 Year Sediment Data
Hu, F.S.
Deep Lake Minnesota 12,000 Year Sediment Data
2000-01-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5475
Investigator
F.S.
Hu
earth science
paleoclimate
paleolimnology
delta 13C,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
varve thickness,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
age,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 18O,carbonate,null,per mil VPDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
oxygen isotopes
earth science
paleoclimate
paleolimnology
age control
earth science
paleoclimate
paleolimnology
population abundance
earth science
paleoclimate
paleolimnology
physical properties
earth science
paleoclimate
paleolimnology
lake level
geoscientificInformation
11910 cal yr BP
7480 cal yr BP
Complete
47.68389
47.68389
-95.39944
-95.39944
Continent
North America
United States Of America
Minnesota
Deep Lake>LATITUDE 47.68389>LONGITUDE -95.39944
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
Hu, F.S.. 1999. Abrupt changes in North American climate during early Holocene times. Nature Vol. 400, pp. 437-440
Recent studies of the Greenland ice cores have offered many insights into Holocene climatic dynamics at decadal to century timescales. Despite the abundance of continental records of Holocene climate, few have sufficient chronological control and sampling resolution to compare with the Greenland findings. Butannually laminated sediments (varves) from lakes can provide high-resolution continental palaeoclimate data with secure chronologies. Here we present analyses of varved sediments from Deep Lake in Minnesota, USA. Trends in the stable oxygen-isotope composition of the sedimentary carbonate indicate a pronounced climate cooling from 8.9 to 8.3 kyr before present, probably characterized by increased outbreaks of polar air, decreased precipitation temperatures, and a higher fraction of the annual precipitation falling as snow. The abrupt onset of this climate reversal, over several decades, was probably caused by a reorganization of atmospheric circulation and cooling of the Arctic airmass in summer that resulted from the final collapse of the Laurentide ice near Hudson Bay and the discharge of icebergs from the Quebec and Keewatin centres into the Tyrell Sea. The timing and duration of this climate reversal suggest that it is distinct from the prominent widespread cold snap that occurred 8,200 years ago in Greenland and other regions. No shifts in the oxygen-isotope composition of sediment carbonate occurred at 8.2 kyr before present at Deep Lake, but varve thickness increased dramatically, probably as a result of increased deposition of aeolian dust. Taken together, our data suggest that two separate regional-scale climate reversals occurred between 9,000 and 8,000 years ago, and that they were driven by different mechanisms.
STUDY NOTES: Deep Lake Minnesota Sediment Data, used for Abrupt Holocene Climate Change analysis by Hu et al.
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https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/deeplake_isotopes.txt
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https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/readme_hu1999.txt
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https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/deeplake_pollen.txt
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https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/deeplake_varves.txt
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https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/deeplake_hu1999.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/greatplains/deeplake/deeplake_c14.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11