Yanchi Lake, Northwest China 16,000 Year Geochemical Data Li, Y.; Wang, N.; Li, Z.; Zhou, X.; Zhang, C. Li, Y. Wang, N. Li, Z. Zhou, X. Zhang, C. earth science/paleoclimate/paleolimnology (hydrogen,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (grain size mean,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,grain size volume weighted mean) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,particles greater than 63um) earth science/paleoclimate/paleolimnology (dolomite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (grain size mean,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,grain size surface weighted mean) earth science/paleoclimate/paleolimnology (quartz,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (calcite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (depth,null,null,centimeter,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (nitrogen,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (sulfur,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (carbon/sulfur,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (anorthite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (sample identification,null,null,null,null,paleolimnology,null,null,C,null) earth science/paleoclimate/paleolimnology (organic carbon,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,dimensionless,null,paleolimnology,null,null,N,frequency-dependent magnetic susceptibility) earth science/paleoclimate/paleolimnology (grain size median,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,null) earth science/paleoclimate/paleolimnology (aragonite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (calcium carbonate,sediment,null,percent,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (grain size mode,sediment,null,micrometer,null,paleolimnology,null,laser particle size analysis,N,null) earth science/paleoclimate/paleolimnology (albite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (gypsum,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (halite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (pH,sediment,null,dimensionless,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (chlorite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,clinochlore; ( Mg2.96 Fe1.55 Fe.136 Al1.275 ) ( Si2.622 Al1.376 O10 ) ( O H )8) earth science/paleoclimate/paleolimnology (carbon/nitrogen,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,total organic carbon/total nitrogen) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,particles smaller than 4um) earth science/paleoclimate/paleolimnology (muscovite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (glauberite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (age,null,null,calendar year before present,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (carbon,sediment,null,percent,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,unspecified unit,null,paleolimnology,null,null,N,low-frequency magnetic susceptibility) earth science/paleoclimate/paleolimnology (magnetic susceptibility,sediment,null,unspecified unit,null,paleolimnology,null,null,N,high-frequency magnetic susceptibility) earth science/paleoclimate/paleolimnology (mass magnetic susceptibility,sediment,null,unspecified unit,null,paleolimnology,null,null,N,null) earth science/paleoclimate/paleolimnology (nitrogen/sulfur,sediment,null,dimensionless,null,paleolimnology,null,elemental analysis,N,null) earth science/paleoclimate/paleolimnology (grain size class,sediment,null,percent,null,paleolimnology,null,laser particle size analysis,N,particles between 4um and 63um) earth science/paleoclimate/paleolimnology (thenardite,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,null) earth science/paleoclimate/paleolimnology (orthoclase,sediment,null,percent,null,paleolimnology,null,x-ray diffraction,N,adularia; K ( Al Si3 O8 )) earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology earth science/paleoclimate/paleolimnology (Yanchi Lake>LATITUDE 39.75>LONGITUDE 99.33) Modern climate research has shown that the Asian summer monsoon water vapor transport is limited to the eastern part of the Qilian Mountains. On the Holocene millennial-scale, whether the northwest boundary of the summer monsoon varies according to climate change is a key scientific issue. Yanchi Lake is located in the northern Qilian Mountains and the middle of the Hexi Corridor, where the modern climate is less affected by the Asian summer monsoon. It is a key research area for examining the long-term variations of the Asian summer monsoon. Paleoclimatic data, including AMS 14C dates of pollen concentrates and bulk organic carbon, lithology, grain-size, mineral composition and geochemical proxies were acquired from sediments of Yanchi Lake. The chronological results show that the lower part of the lacustrine section is formed mainly in the Late Glacial and early Holocene period, while the proxies' data indicate the lake expansion is associated with high content of mineral salts. The middle part of this section is formed during the transitional period of the early and middle Holocene. Affected by the reworking effect, the pollen concentrates AMS 14C dates from the middle part of the section are generally older than those from the lower part. Since the mid-Holocene, Yanchi Lake retreated significantly and the deposition rate dropped obviously. The Yanchi Lake record is consistent with the Late Glacial and Holocene lake records in the Qinghai-Tibet Plateau and the climatic records in typical monsoon domain, which indicate the lake expansion and the strong Asian summer monsoon during the Late Glacial and early Holocene. The long-term monsoonal pattern is different from the lake evolution in Central Asia on the Holocene millennial-scale. This study proves the monsoon impacts on the northwestern margin of the summer monsoon, and also proves the fact that the northern boundary of the summer monsoon moves according to millennial-scale climate change. STUDY NOTES: Geochemical and physical properties data from sediments collected in Yanchi Lake, Northwest China for the past 16,000 years. NCDC-Paleoclimatology https://www.ncdc.noaa.gov/data-access/paleoclimatology-data - Bauer Bruce Investigator : Li, Y. Investigator : Wang, N. Investigator : Li, Z. Investigator : Zhou, X. Investigator : Zhang, C. 2017-03-14 ONLINE Files online, ASCII https://www.ncdc.noaa.gov/paleo/study/21991 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013mineral.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013gs.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013geochem.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013mineral.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013gs.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013geochem.txt English https://www.ncdc.noaa.gov/paleo/study/21991 https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013mineral.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013gs.txt https://www1.ncdc.noaa.gov/pub/data/paleo/paleolimnology/asia/china/yanchi2013geochem.txt Yu Li, Nai'ang Wang, Zhuolun Li, Xuehua Zhou, Chengqi Zhang2013Climatic and environmental change in Yanchi Lake, Northwest China since the Late Glacial: A comprehensive analysis of lake sedimentsJournal of Geographical Sciences235932-94610.1007/s11442-013-1053-3https://link.springer.com/article/10.1007/s11442-013-1053-3 START YEAR: 16277 cal yr BP * END YEAR: 34 cal yr BP 99.33 39.75 99.33 39.75