| An Integrated Analysis of Dry-Wet Variability in Western China for the Last 4-5 Centuries |
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| 作者姓名： | 钱维宏 林祥 |
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| 作者单位： | Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871,Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871, Chinese Academy of Meteorology, China Meteorological Administration, Beijing 100081 |
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| 基金项目： | The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) |
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| 摘 要： | The dry-wet variability in western China and its spatiotemporal structure during the last 4-5 centuries was examined using 24 climate proxies from sediments, ice cores, historical documents, and tree rings. Spatial patterns and temporal evolutions of dryness and wetness were not only extracted from the proxy data using rotated empirical orthogonal function (REOF) analysis for the last 4 centuries, but also for instrumental data in the last 40 years. The leading five REOF modes indicate that 5 dry-...
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| 关 键 词： | REOF 潮湿 可变性 大气科学 |
| 收稿时间： | 29 August 2002 |
An integrated analysis of dry-wet variability in western China for the last 4–5 centuries |
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| Weihong?Qian,Xiang?Lin.An Integrated Analysis of Dry-Wet Variability in Western China for the Last 4-5 Centuries[J].Advances in Atmospheric Sciences,2009,26(5):951-961. |
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| Authors: | Weihong Qian Xiang Lin |
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| Institution: | Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871 and Monsoon and Environment Research Group, School of Physics, Peking University, Beijing 100871, Chinese Academy of Meteorology, China Meteorological Administration, Beijing 100081 |
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| Abstract: | The dry-wet variability in western China and its spatiotemporal structure during the last 4--5
centuries was examined using 24 climate proxies from sediments, ice cores, historical documents, and tree
rings. Spatial patterns and temporal evolutions of dryness and wetness were not only extracted from the proxy data
using rotated empirical orthogonal function (REOF) analysis for the last 4 centuries, but also for instrumental
data in the last 40 years. The leading five REOF modes indicate that 5 dry-wet variation centers exist in western
China. Moreover, long-term variability in dryness and wetness is seen on long (centennial) to short (inter-decadal)
timescales. An out-of-phase relationship for the inter-decadal variation was observed between the Hetao-upper Yangtze
River region and north Xinjiang, indicating influences on dry-wet variations of the East Asian summer monsoon and the
westerly winds over the two regions, respectively. A particularly long dry spell was found in the central Tibetan
Plateau in the 19th century. A predominance of wet decades in the last 4 centuries was found in the arid and Hetao
regions. Three regional dry-wet series with annual resolution in north Xinjiang, the upper Yellow River valley, and
the Hetao area were constructed for analyses of the last 500 years. Dry-wet oscillations with periodicities of 16, 50,
and 150 years in north Xinjiang, 50 years in the upper Yellow River valley, and 70--80 years in the Hetao region were
identified by wavelet analysis. In general, these periods correspond to large-scale oscillations found in the climate
system, are mainly related to ocean-atmosphere interaction. |
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| Keywords: | dry-wet variability natural proxy historical documents western China |
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