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首页> 外文期刊>Acta Meteorologica Sinica >Impact of Ocean-Continent Distribution over Southern Asia on the Formation of Summer Monsoon
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Impact of Ocean-Continent Distribution over Southern Asia on the Formation of Summer Monsoon

机译：南亚海洋大陆分布对夏季风形成的影响

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摘要

Using the CCM3/NCAR, a series of numerical experiments are designed to explore the effect of ocean-land interlaced distributions of Africa-Arabian Sea-India Peninsula-Bay of Bengal (BOB)-Indo-China Peninsula-South China Sea on the formation of the Asian summer monsoon circulation (ASMC). The results show that the thermal difference between African or Indian Subcontinent and nearby areas including the Indian Ocean, Arabian Sea, and part of BOB is the primary mechanism that maintains the Indian monsoon circulation. In the experiment getting rid of these two continents, the Indian monsoon system (IMS) members, i.e., the Somali cross-equatorial jet (40°E) and the southwesterly monsoon over the Arabian Sea and BOB, almost disappear. Moreover, the Hadley circulation weakens dominantly. It also proves that Africa has greater effect than Indian Subcontinent on the IMS. However, the existence of Indo-China Peninsula and Australia strengthens the East Asian monsoon system (EAMS). The thermal contrast between Indo-China Peninsula and SCS, Australia and western Pacific Ocean plays an important role in the formation of the tropical monsoon to the south of the EAMS. When the Indo-China Peninsula is masked in the experiment, the cross-equatorial flow (105°E and 125°E) vanishes, so does the southwesterly monsoon usually found over East Asia, and EAMS is enfeebled significantly. In addition, the impacts of these thermal contrasts on the distribution of the summer precipitation and surface temperature are investigated.
机译：使用CCM3 / NCAR，设计了一系列数值实验，以探讨非洲-阿拉伯海-印度半岛-孟加拉湾（BOB）-印度支那半岛-南中国海的海陆交错分布对地层的影响亚洲夏季风环流（ASMC）。结果表明，非洲或印度次大陆与附近地区（包括印度洋，阿拉伯海和部分BOB）之间的热差异是维持印度季风环流的主要机制。在摆脱这两个大陆的实验中，印度季风系统（IMS）成员，即索马里跨赤道急流（40°E）和阿拉伯海和BOB的西南季风几乎消失了。此外，哈德利环流显着减弱。这也证明非洲在IMS方面的影响大于印度次大陆。但是，印度支那半岛和澳大利亚的存在加强了东亚季风系统（EAMS）。印度支那半岛与南海，澳大利亚和西太平洋之间的热对比在EAMS南部热带季风的形成中起着重要作用。在实验中遮盖印度支那半岛时，越过赤道流（105°E和125°E）消失，通常在东亚发现的西南季风也消失，EAMS明显减弱。另外，研究了这些热对比对夏季降水分布和地表温度的影响。

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