期刊
ATMOSPHERIC RESEARCH
卷 226, 期 -, 页码 240-254出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.atmosres.2019.04.027
关键词
Light precipitation events; Consecutive light precipitation; Atmospheric circulation; Huai River Eco-economic Corridor
资金
- Open Project of Huai River Ecoeconomic Corridor Research Institute [HHKF201909]
- MOE (Ministry of Education in China) Project of Humanities and Social Sciences [19YJCZH259]
- National Key Research and Development Program of China [2016YFA0601700]
- National Natural Science Foundation of China [41471425]
- Huai'an Xiangyu Talent Foundation [31ZYQ01]
Light precipitation events generally occur much more frequently than events of other precipitation intensities. Changes in light precipitation amounts and days (length) over time have profound implications for climate change. There is a lack of quantitative monitoring indicators or in-depth analysis techniques for atmospheric circulation mechanisms of regional light precipitation events, especially in climate transitional zones. The Huai River Eco-economic Corridor (HREC) served as a case area in this study as we assessed trends in light precipitation events and their possible atmospheric circulation mechanisms. A significant decreasing trend in the light precipitation events is observed and appears to be mainly concentrated in the lower intensities (0.1 <= P < 2 mm/day). The decreasing trend is more obvious for consecutive than discrete light precipitation events. The mutation points for annual consecutive light precipitation events were found in 1977/1978, and averages in the later years of the observation period (1978-2014) fell significantly below those of the earlier period (1961-1977). Atmospheric circulation variables corresponding to the light precipitation days with intensity of 0.1-2 mm/day revealed that the decreasing trends in water vapor transport budgets, low cloud cover, and total column cloud liquid water may be the primary causes of decreased light precipitation events. The decreasing trends in light precipitation events were also likely attributable to increases in water vapor flux divergence, air temperature, and vertical velocity values.
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