ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 46 Issue 1 > 2020,46(1):129-137. DOI:10.7519/j.issn.1000-0526.2020.01.013 Prev Next
Atmospheric Circulation in East Asia in Summer 2019 and Its Influence on Climate of China
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Abstract:
To better understand the basic features and causes of the climate anomalies in summer 2019 (June-July-August 2019) in China, this paper analyzes the spatio-temporal distributions of the precipitation and temperature in the period, as well as the features of the general circulation in East Asia on the basis of the observation data and the NECP/NCAR reanalysis data. The possible reason why less precipitation occurred in the middle and lower reaches of the Yangtze River under an El Ni〖AKn~D〗o event is also diagnosed preliminarily. The results illustrate that in the summer of 2019, the temperature was warmer than normal in most regions in China, and the national averaged precipitation was close to normal, but the distribution of droughts and floods had obvious spatial differences. The main rainfall centers in eastern China were located from the regions south of the Yangtze River (Jiangnan) to South China and in Northeast China, while persistent meteorological droughts occurred in Yunnan Province and the Huanghuai Region. The precipitation in eastern China also showed remarkable intraseasonal variation, especially in the Jiangnan Region. In early summer, the precipitation in Jiangnan occurred in a high frequency, causing serious floods. In late summer, the precipitation decreased rapidly but high temperature developed rapidly. The pre-flood season in South China and the Chinese Meiyu season in the south of the Yangtze River both began earlier and ended late. In the summer of 2019, the atmospheric circulation in Eurasian Continent presented a typical negative-positive-negative pattern. The sustained trough over the Yellow Sea of China and the Japan Sea resulted in a more southward and westward western Pacific subtropical high (WPSH). This trough was also the direct cause for the less rainfall in the middle and lower reaches of the Yangtze River and more rainfall in the south of the Yangtze River. It was obviously by south in the early summer, which is consistent with the evolution of the WPSH. However in the late summer, the trough weakened and moved northward, and the WPSH traveled northward rapidly, which led the rain belt to move rapidly to northern China.
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