ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 51 Issue 10 > 2025,51(10):1272-1281. DOI:10.7519/j.issn.10000526.2025.101601 Prev Next
Characteristics and Possible Causes of the Climate Anomalies over China in Spring 2025
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Abstract:
During spring (March to May) of 2025, the mean temperature in China was 0.9℃ higher than the climatological mean, ranking as the fourth warmest since 1961. The spring mean precipitation was close to normal, exhibiting distinct intraseasonal variability characteristics. In southern China, due to the less than normal precipitation in the early spring, severe meteorological drought occurred, but precipitation increased in the late spring, leading to flood disasters in some regions. In northern China, from eastern Northwest China to western HuangHuai Region, severe meteorological drought occurred because of much less precipitation from April to May. The intraseasonal transition of precipitation in southern China was mainly caused by the combined effects of the previous winter La Nina state and the intraseasonal warming of the tropical Indian Ocean sea surface temperature in spring. In the early spring, the Indian Ocean sea surface temperature was slightly colder, showing a response to the winter La Nina state. This was conducive to the emergence of an abnormal cyclonic circulation in the Northwest Pacific, leading to less precipitation in southern China. However, in the late spring, the pronounced warming of the Indian Ocean sea surface temperature favored an abnormal anticyclone in the Northwest Pacific, leading to the increased precipitation in southern China. The drought in the Northwest China to HuangHuai regions in April and May was mainly the result of the stable maintenance of the atmospheric Eurasian teleconnection pattern at midtohigh latitudes.
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P461
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