Journal
CLIMATE DYNAMICS
Volume 54, Issue 7-8, Pages 3751-3764Publisher
SPRINGER
DOI: 10.1007/s00382-020-05203-8
Keywords
Southern China; Heat waves; South China Sea summer monsoon; Pacific subtropical high
Categories
Funding
- National Key Research and Development Program of China [2018YFC1505801, 2016YFA0602703]
- National Natural Science Foundation of China [41690123, 41690120, 91637208]
- Sichuan Science and Technology Program [2018JY0030]
- CMA Guangzhou Joint Research Center for Atmospheric Sciences
Ask authors/readers for more resources
We investigate a record-breaking heat wave in southern China (SC) and explore its association with the South China Sea (SCS) summer monsoon (SCSSM), using station observations and various reanalysis products. This heat wave event started in mid-May 2018 and persisted more than 15 days, when the maximum air temperature anomaly exceeded 6 degrees C. Meanwhile, the onset of the SCSSM was extremely late in 2018, primarily due to the intrusion of easterly winds over the SCS. We show that the anomalous easterlies over the SCS associated with the delayed SCSSM could block the moisture transport from the tropical oceans to SC, which led to decreased rainfall, increased surface radiation, and elevated probability of heat wave in SC during May 2018. Further analysis reveals that both SC heat waves and SCSSM were significantly affected by the Pacific subtropical high (PSH). The westward extension of the PSH can hinder the establishment of SCSSM via inducing easterly anomalies over the SCS, which reduces SC rainfall and results in a drier surface condition. Moreover, the westward displacement of the PSH may cause anomalously high pressures, descending air motions, and divergent winds over SC, which triggers above-normal air temperatures that are conducive to the occurrences of SC heat waves. This study also underlines the importance of Eurasian planetary wave trains in bridging the upstream climate variability and the changes in PSH during boreal spring, which could be used to improve the intra-seasonal predictions of SC heat wave and SCSSM onset.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available