气候变化领域集成服务门户(CCPortal): Summer Regional Daily-Precipitation Extreme Events in Huang-Huai Rivers Region of China and Their Relationships With Rossby Wave Packet Activities

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DOI	10.1029/2020JD034065
	Summer Regional Daily-Precipitation Extreme Events in Huang-Huai Rivers Region of China and Their Relationships With Rossby Wave Packet Activities
	Sun S.; Guan Z.; Ye D.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	The regional daily-precipitation extreme events (RDPEs) have profound societal impacts. Based on NCEP/NCAR reanalysis and datasets of daily basic meteorological elements from China national meteorological stations, the statistical characteristics of RDPEs in the Huang-Huai Rivers (HHR) region in eastern China from 1979 to 2016 and their relationships with Rossby wave activities are investigated. The results show that in the summers (June-August) of 1979–2016, the 95 percentile threshold of regional extreme daily-precipitation in HHR region is 27.32 mm/d. There are 77 RDPEs in total in the past 38 years. When RDPEs occur, HHR region is controlled by an anomalous cyclonic circulation in the middle and lower troposphere and an anomalous anticyclonic circulation in the upper troposphere. The water vapor is mainly transported from the Bay of Bengal and the South China Sea into HHR region. Rossby waves originate near the Caspian Sea and obviously disperse downstream-ward, taking about 4 days to move to HHR region. The eddy kinetic energy at 200 hPa over HHR region reaches its maximum on the day before RDPEs occur and decrease from then on. This decrease is dominated by processes including advection transport of eddy kinetic energy and barotropic energy conversion by time-mean flow. The intensification tendency of baroclinic conversion weakens while barotropic conversion play an important role in the weakening of eddy kinetic energy. The migrations of wave packets, meridional transports of warmer air and momentum over HHR region during 4 days before RDPEs occurrences may provide useful clues to forecasting RDPEs. © 2021. The Authors.
英文关键词	boreal summer; energetic; Huang-Huai Rivers region of China; regional daily-rainfall extreme; Rossby wave
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185379
作者单位	Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Key Laboratory of Meteorological Disaster, Ministry of Education (KLME), International Joint Laboratory on Climate and Environment Change (ILCEC), Nanjing University of Information Science and Technology, Nanjing, China; School of Environment, Tsinghua University, Beijing, China
推荐引用方式 GB/T 7714	Sun S.,Guan Z.,Ye D.. Summer Regional Daily-Precipitation Extreme Events in Huang-Huai Rivers Region of China and Their Relationships With Rossby Wave Packet Activities[J],2021,126(7).
APA	Sun S.,Guan Z.,&Ye D..(2021).Summer Regional Daily-Precipitation Extreme Events in Huang-Huai Rivers Region of China and Their Relationships With Rossby Wave Packet Activities.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Sun S.,et al."Summer Regional Daily-Precipitation Extreme Events in Huang-Huai Rivers Region of China and Their Relationships With Rossby Wave Packet Activities".Journal of Geophysical Research: Atmospheres 126.7(2021).