ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 48 Issue 7 > 2022,48(7):925-935. DOI:10.7519/j.issn.1000-0526.2022.061701 Prev Next
Characteristics of Climate Anomalies over China in Winter 2021/2022 and Causes for Precipitation Anomalies over Southern China
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Abstract:
The East Asian winter monsoon and the Siberian high were both stronger than normal during the 2021/2022 winter. Temperature over China was colder than normal in winter, and the overall spatial feature was “warmer in Northern China and colder in Southern China”. Precipitation over China was more than normal, especially in the Qinghai-Tibetan Plateau, Southwest China and South China. The Arctic Oscillation maintained a positive phase for a long time in winter, in favorable for the weak Ural Mountain blocking high. The Okhotsk blocking high was abnormally active, and the center of the positive anomaly at the 500 hPa height field extended westward from the Sea of Okhotsk to Lake Baikal-Lake Balkhash. In addition, the positive phase of the Arctic Oscillation in winter also affected East Asia by an indirect way of the southern Eurasian teleconnection, leading to a stronger Middle East jet stream and a persistently lower height field in Tibetan Plateau. Coordinated with the La Ni〖AKn~D〗a event, the 500 hPa height field over East Asia presented a “higher in the north and lower in the south” pattern, thus temperature over China showed an anomalous distribution of “warmer in the Northern China and colder in Southern China”, and precipitation over Southern China was more than normal. Temperature over China was “warmer in the earlier winter and colder in the later winter”, which was closely related to the intraseasonal variation of the East Asian winter monsoon, which was “weaker in the earlier winter and stronger in the later winter”.
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