noaa-lake-5451
Ahung Co, Tibet Holocene Sediment Geochemistry
Morrill, C.; Overpeck, J.T.; Cole, J.E.; Liu, K.-B.; Shen, C.; Tang, L.
Ahung Co, Tibet Holocene Sediment Geochemistry
2006-03-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/5451
Investigator
C.
Morrill
Investigator
J.T.
Overpeck
Investigator
J.E.
Cole
Investigator
K.-B.
Liu
Investigator
C.
Shen
Investigator
L.
Tang
earth science
paleoclimate
paleolimnology
organic carbon,sediment,null,percent,null,paleolimnology,null,carbon coulometry,N,null
earth science
paleoclimate
paleolimnology
delta 18O,carbonate,null,per mil PDB,null,paleolimnology,corrected,isotope ratio mass spectrometry,N,corrected for dolomite
earth science
paleoclimate
paleolimnology
dolomite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,composite depth
earth science
paleoclimate
paleolimnology
principal component,null,null,dimensionless,null,paleolimnology,null,null,N,PC#2 of multiple geochemical proxies
earth science
paleoclimate
paleolimnology
delta 18O,carbonate,null,per mil PDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
delta 13C,carbonate,null,per mil PDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null
earth science
paleoclimate
paleolimnology
delta 13C,organic matter,null,per mil PDB,null,paleolimnology,null,isotope ratio mass spectrometry,N,null
earth science
paleoclimate
paleolimnology
principal component,null,null,dimensionless,null,paleolimnology,null,null,N,PC#1 of multiple geochemical proxies
earth science
paleoclimate
paleolimnology
principal component,null,null,dimensionless,null,paleolimnology,null,null,N,PC#3 of multiple geochemical proxies
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,actual depth
earth science
paleoclimate
paleolimnology
age,null,null,calendar year before present,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
carbonate,sediment,null,percent,null,paleolimnology,null,carbon coulometry,N,null
earth science
paleoclimate
paleolimnology
geochemistry
geoscientificInformation
9494 cal yr BP
3887 cal yr BP
Complete
31.62
31.62
92.06
92.06
4575
4575
Continent
Asia
Eastern Asia
China
Ahung Co>LATITUDE 31.62>LONGITUDE 92.06
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
Morrill, C., J.T. Overpeck, J.E. Cole, K.-B. Liu, C. Shen, L. Tang. 2006. Holocene variations in the Asian monsoon inferred from the geochemistry of lake sediments in central Tibet. Quaternary Research Vol. 65, pp. 232-243
We present a record of monsoon variations for the early and middle Holocene that is inferred from the geochemistry of sediment cores from Ahung Co, a lake in central Tibet. The resolution of this record is better than 50 years and the age model is derived from radiocarbon ages of terrestrial charcoal, which eliminates errors associated with the lake hard-water effect. We made down-core geochemical measurements of: % carbonate, % organic carbon, C/N and d13C of bulk organic matter, d13C and d18O of carbonate, and % dolomite. Proxy calibration and modern water-balance reconstruction show that these are proxies for lake depth and the amount of monsoon precipitation. We find that lake level and monsoon precipitation have been decreasing at Ahung Co since the early Holocene (~7500 cal yr BP). Superimposed on this trend are rapid declines in monsoon rainfall at 7000-7500 and 4700 cal yr BP and seven century-scale wet-dry oscillations. The cores do not contain sediment from the last ~4000 years. Surface sediments from the lake accumulated during the 20th century, however. From this, we argue that lake levels have risen again recently following a late Holocene dry period.
STUDY NOTES: Geochemical data from cores 2A, 3A and 4A from Ahung Co, Tibet
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ahungco2006.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/tibet/ahungco2006.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11