ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 46 Issue 4 > 2020,46(4):566-574. DOI:10.7519/j.issn.1000-0526.2020.04.011 Prev Next
Features and Possible Causes of the Climatic Anormaly in China in Autumn 2019
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Abstract:
During the autumn of 2019, the surface air temperatures were above normal in most areas in China, and it was the third warmest in the same period after 1961. The distribution of precipitation over China was more in the west and north, and less in the east and south of China. By analyzing the causes for the climatic anomaly, we found that in autumn, activities of ridges and troughs in middle and high latitudes of Eurasia were seen frequently, the cold air activity was near normal, and the western Pacific subtropical high (WPSH) was stronger and more northwestward than normal. The western part of WPSH was located over the west of the South China Sea, which was conducive to the southwest water vapor transportation to the western part of China. The northeast 〖JP2〗of the Philippines was under the control of strong cyclonic anomaly〖JP〗 circulation, making the southern part of China controlled by the northerly air flow and resulting in poor water vapor condition. Further studies show that the sea surface temperature (SST) anomaly was the major external forcing factor for the climatic anomalies in the autumn of 2019. In July 2019, the weak central Pacific type El Ni〖AKn~D〗o event ended, and the autumn SST distribution was inclined to the central type. The subtropical circulation in East Asia showed a clear response.
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