Time‐lagged effects of spring Tibetan Plateau soil moisture on the monsoon over China in early summer
Time‐lagged effects of spring Tibetan Plateau soil moisture on the monsoon over China in early summer
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DOI：
10.1002/joc.1511
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发表时间：
2007-05
期刊：
影响因子：
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通讯作者：
K. Chow;J. Chan;Xueli Shi;Yiming Liu;Yihui Ding
中科院分区：
文献类型：
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作者：
K. Chow;J. Chan;Xueli Shi;Yiming Liu;Yihui Ding
本文研究了青藏高原春季初始土壤湿度（ISMTP）对随后几个月当地和区域气候的影响。利用一个区域气候模式，对1998年4月1日至6月30日不同的ISMTP模式进行了数值试验。这是一个多雨的一年，中国夏季降水量异常高。1995年是中国夏季降水正常的年份，我们也进行了同样的实验。在这两年中，青藏高原（TP）的降雪量高于正常的前一个冬季/春季。试验结果表明，ISMTP的增加可能会导致6月TP的空气温度，垂直速度和地面加热的减少。除了局地影响外，ISMTP的增加还可能导致初夏某些偏远地区气候的改变，如中国东部长江中下游地区季风降水量增加，华南地区季风降水量减少。这些降水的差异，由于在ISMTP的变化是一致的，由于异常积雪在TP在冬季或春季。物理上，随着ISMTP的增强，青藏高压减弱，导致亚洲夏季风强度的变化。版权所有© 2007皇家气象学会
The objective of the present study is to investigate the effect of initial soil moisture in the Tibetan Plateau (ISMTP) during the spring period on the local and regional climate in subsequent months. Numerical experiments with different ISMTP are made from 1 April to 30 June for the year 1998 using a regional climate model. This was a wet year with anomalously high summer precipitation over China. The same experiments have also been done for the year 1995, which was a normal year with respect to the summer rainfall over China. In both years, the snow amount over the Tibetan Plateau (TP) was higher than normal in the preceding winter/spring. The results of the experiments indicated that an increase in the ISMTP may lead to decreases in the air temperature, vertical velocity, and surface heating over the TP in June. In addition to the local effects, an increase in the ISMTP may also lead to modifications of the climate in some remote regions in early summer, such as an increase in the amount of monsoon precipitation over the mid to lower reaches of the Yangtze River region in eastern China and a decrease over the south China region. These precipitation differences due to the changes in ISMTP are consistent with those due to anomalous snow cover over the TP in winter or spring. Physically, the Tibetan High is weakened with an increase in ISMTP, which leads to a change in the strength of the Asian summer monsoon. Copyright © 2007 Royal Meteorological Society