Synoptic systems and weather
Synoptic systems and weather
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DOI：
10.1007/3-540-37722-0_4
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Yihui Ding;D. Sikka
中科院分区：
文献类型：
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作者：
Yihui Ding;D. Sikka
亚洲季风系统的年周期通常分为两个不同的阶段：湿“和干”阶段（韦伯斯特等人，1998年）。湿相是指雨季，在此期间，温暖，潮湿和非常扰动的风从温暖的热带海洋（印度洋和太平洋）吹向内陆。干燥阶段是指一年中的另一半，当风从冬季亚洲大陆带来凉爽干燥的空气时。亚洲季风区具有最明显的年周期变化和干湿季节交替，这与季风环流特征的季节性反转相一致（Qian，2000）。雨季一般从5月开始，10月结束，持续约6个月，旱季从11月到次年4月。然而，对于亚洲季风区的不同地区，旱季和雨季的持续时间可能不同，这取决于其气候区域和亚洲季风的影响程度。例如，在南亚，干湿季分明，而在东亚，四季分明，但干湿季是该地区降水年内变化的主要方式。在东亚中纬度地区，如中国中部沿着的长江、淮河流域和朝鲜半岛，由于这些地区的湿润期短于一个月，因此通常不包括在干湿交替区中（Bao，1987）。这些短暂的雨季主要发生在这些地区的夏季风盛行期间。总降水量和降水强度干湿季差异显著，降水量年际变幅较大，反映了降水量年际变化的幅度。最大的年度范围超过
The annual cycle of the Asian monsoon system has been customarily divided into two distinct phases: thewet'anddry'phases (Webster et al., 1998). The wet phase refers to the rainy season during which warm, moist, and very disturbed wind blows inland from the warm tropical oceans (the Indian and Pacific Oceans). The dry phase refers to the other half of the year when winds bring cool and dry air from the winter Asian continents. The Asian monsoon region assumes the most distinct variation of the annual cycle and the alternation of dry and wet seasons which is in concert with the seasonal reversal of the monsoon circulation features (Qian, 2000). The wet season in general begins from May and ends in October, lasting for about six months, and the dry season spans from November to April of the next year. However, for different parts of the Asian monsoon region, the durations of dry and wet seasons may be different, depending on their climate regions and the degree of effect of the Asian monsoon. For example, in south Asia, the dry and wet seasons are very well-defined while in east Asia, four seasons can be evidently perceived, although the dry and wet seasons are main modes of the annual march of the precipitation in this region. In mid-latitude regions of east Asia, such as central China along the Yangtze and Huaihe River basins and Korean Peninsula, they are not generally included in the dry and wet alternative regions because the wet period for theses regions is shorter than one month (Bao, 1987). These short rainy periods mainly occur during prevalence of the summer monsoon in these regions. The total rainfall amount and rainfall intensity show a remarkable difference between dry and wet seasons, with a quite large annual range of precipitation that measures the amplitude of annual variation. The largest annual range exceeding