ISSN 1000-0526
CN 11-2282/P
CN 11-2282/P
Archive > Volume 42 Issue 4 > 2016,42(4):507-513. DOI:10.7519/j.issn.1000-0526.2016.04.015 Prev Next
Possible Causes for the Warmer and Wetter Autumn in 2015 in China
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Abstract:
During the autumn of 2015, the averaged surface air temperature in China was above normal. The mean precipitation in China was much more than normal, ranked as the 3rd since 1951. Thus, the autumn 2015 in China generally featured “warm and wet”. However, the temporal evolution of the precipitation of South and North China exhibited different characteristics. Driven by the different water vapor conditions, the South China was characterized by persistent precipitation, while North China featured several heavy rainfall events. By diagnosing the circulation anomaly, it was found that, the persistent anomalous rainfall over South China was associated with the forcing of the super strong El Ni〖AKn~〗o and warmer tropical Indian Ocean. The continued anomalous warming over the tropical eastern Pacific and Indian Ocean together strengthened the western Pacific subtropical high and pushed it westward. The anomalous southerlies along the western side of western Pacific subtropical high guided more water vapor from the South China Sea and the western Pacific to South China, causing the wetter autumn there. Meanwhile, the amplitudes of ridges and troughs in midlatitude regions were larger than normal, causing several strong cold air processes over North China, along with the water vapor transport from the East China Sea and South China Sea, and further leading to the anomalous precipitation in North China.
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