noaa-lake-6205
Lake Qinghai Surface Sediment Isotope and Geochemical Data
Xu, H.; Ai, L.; Tan, L.; An, Z.
Lake Qinghai Surface Sediment Isotope and Geochemical Data
2008-11-01
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/6205
Investigator
H.
Xu
Investigator
L.
Ai
Investigator
L.
Tan
Investigator
Z.
An
earth science
paleoclimate
paleolimnology
delta 13C,organic matter,null,per mil,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 18O,carbonate,null,per mil PDB,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
depth,null,null,centimeter,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
organic carbon,sediment,null,percent,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
delta 13C,carbonate,null,per mil PDB,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
carbonate,sediment,null,percent,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
age,null,null,year Common Era,null,paleolimnology,null,null,N,null
earth science
paleoclimate
paleolimnology
geochemistry
geoscientificInformation
566 cal yr BP
-49 cal yr BP
Complete
37.058
37.058
100.303
100.303
3192
3192
Continent
Asia
Eastern Asia
China
Qinghai
Lake Qinghai>LATITUDE 37.058>LONGITUDE 100.303
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
Xu, H.,Ai, L.,Tan, L.,An, Z. 2006. Stable isotopes in bulk carbonates and organic matter in recent sediments of Lake Qinghai and their climatic implications. Chemical Geology, 235(3–4), 262–275.
Multi-proxy indices on annual/decadal scales during the past 600 years were developed from the surface sediments of Lake Qinghai based on 210Pb and 137Cs geochronology. The d13Ccarb, d18Ocarb, and total carbonate content are consistent with one another in trends and their variations have been mainly ascribed to regional temperature. It is suggested that the strong evaporation contributes in modifying d18O of lake water and d13C of the dissolved inorganic carbon of the surface water, and appears to be responsible for the covariance between d13Ccarb and d18Ocarb. Photosynthesis of the aquatic plants appears to have played a significant role in determining d15N of organic matter. The discrimination of 14N and 15N during photosynthesis may have triggered a positive linkage between temperatures and d15Norg (after removal of the stratigraphic trend).Variations of total organic carbon (TOC), C/N ratio, and d13Corg have been ascribed to local precipitation. TOC (after removal of the stratigraphic trend) is positively correlated with the C/N ratio (r = 0.45, a < 0.01), and negatively correlated with d13C of organic matter (d13Corg) (r = - 0.55, a < 0.01); while d13Corg is negatively correlated with the C/N ratio (r = - 0.48, a < 0.01). The climatic significance of these multi-proxy indices has been verified by comparing with the meteorological records and the climates inferred from tree rings in adjacent regions.
STUDY NOTES: Stable isotope and geochemical data from near-surface sediments (upper 30 cm., ~600 yrBP) from Lake Qinghai, central China. The indices from surface sediments of Lake Qinghai can be generally divided into two groups. One is dominated by precipitation (TOC, C/N, d13Corg); the other is dominated by
temperature (d13Ccarb, d18Ocarb, total carbonate content).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/qinghai2006.xls
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/qinghai2006.txt
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11