Different responses of different altitudes surrounding Taklimankan Desert to global climate change |
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Authors: | E Chongyi Wang Yong Yang Taibao Han Jiankang Hu Hongchang Yang Fengmei |
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Institution: | (1) Key Laboratory of Western China’s Environmental Systems, MOE, Lanzhou University, 730000 Lanzhou, China;(2) College of Biology and Geography, Qinghai Normal University, 810000 Xining, China;(3) Jiangsu Key Laboratory of Meteorogical Disaster, Nanjing University of Information Science & Technology, 210044 Nanjing, China;(4) Research Institute of Environment and Resources, Hunan Normal University, 410081 Changsha, Hunan, People’s Republic of China |
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Abstract: | Chongce Ice Cap (35°14′N, 81°07′E), located in the south margin of Taklimakan Desert, West Kunlun Mts. of China was sampled
by coring in 1992, and this provides us with climate proxy of high altitudes (6,530 m). Through analyzing the weather observation
stations surrounding Taklimakan Desert, the climate record of Hotan station was chosen to be the representative of low altitudes.
Wavelet analysis were used to investigate the climatic variations of patterns, cycles and frequencies of different altitudes
from 1954 to 1992, and different responses of different altitude surrounding Taklimakan Desert to global warming were recorded:
(1) coherent decline of snow accumulation rate and dust deposition of high altitude recorded in Chongce ice core; (2) coherent
increase of summer half-year precipitation and SAT of Hotan; (3) consistent variation tendency between dust deposit recorded
in Chongce ice core and Hotan spring sandstorm days; (4) opposite variation tendency between Hotan precipitation and Chongce
ice core snow accumulation rate and consistent cycles in general. By analyzing the mechanism of different responses, the predominant
factors were determined of different altitudes: (1) at the low altitude, the vapor supply is predominant, and more vapor supplying
means more precipitation; (2) at the high altitude, probably the population of dust aerosols which act as cloud ice nuclei
in high altitude takes advantage over the vapor supply to affect the precipitation, and so the dust aerosol population reducing
results in the wet deposition being reduced, thus the dust aerosol is the predominant factor. |
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Keywords: | Global warming Climatology |
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