A Holocene climatic record denoted by geochemical indicators from Barkol Lake in the northeastern Xinjiang,NW China |
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| Authors: | Wei Zhong Jibin Xue Xiaodong Li Huajun Xu Jun Ouyang |
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| Institution: | 1.School of Geography Science,South China Normal University,Guangzhou,China;2.Key Laboratory of Oasis Ecology (Ministry of Education),Xinjiang University,Urumqi,China;3.School of Tourism,Xinjiang University,Urumqi,China |
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| Abstract: | The Barkol Lake, as a closed inland lake, is located at the northeast Xinjiang in northwest China. A combination of geochemical
indicators including δ18O and δ13C of carbonate, TOC, carbonate contents, as well as grain size proxies and magnetic susceptibility of sediments obtained from
a newly recovered section at this lake, provides a high-resolution history of climatic change in the past 9400 years. Multi-indicators
reflect that Holocene climatic change in the study region generally follows the Westerly Wind pattern of Holocene, and three
climatic periods can be identified. Between 9400 and 7500 cal a B.P., climate was characterized by relatively drier and colder
condition. From 7500 to 5800 cal a B.P., a relatively warmer and moister climate prevailed, but between 5800 and 3500 cal
a B.P., climate shifted towards warmer and drier conditions. A relatively colder and wetter climate prevailed during 3500∼1000
cal a B.P., then it changed towards cold and dry between 1000 and 500 cal a B.P.; after 500 cal a B.P., climate changed towards
warm and dry conditions again. This study reflects that during the Middle Holocene (from ca 7000 to 3500 cal a B.P.), variations
of carbonate δ18O of sediments from several lakes in the northern Xinjiang were synchronous with that of Qinghai Lake, where was strongly
influenced by the South Asian monsoon; however, after 3500 cal a B.P. this consistency was interrupted, possibly resulting
from a re-domination of the Westerly Wind and the retreat of South Asian monsoon in the northern Xinjiang. |
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