气候变化领域集成服务门户(CCPortal): Influence of ENSO on frequency of wintertime fog days in Eastern China

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DOI	10.1007/s00382-018-4437-3
	Influence of ENSO on frequency of wintertime fog days in Eastern China
	Yu H.; Li T.; Liu P.
发表日期	2019
ISSN	0930-7575
起始页码	5099
结束页码	5113
卷号	52 期号:2020-09-10
英文摘要	The influence of El Niño–Southern Oscillation (ENSO) on wintertime fog days in eastern China was investigated through the analysis of fog station data in China and the National Centers for Environmental Prediction reanalysis data during the period of 1954–2007. A composite analysis shows distinctive anomaly patterns of fog days in early and late winter during ENSO. More frequent fogs appear in Central and North China (around 30°–40°N) in November–December (ND), while more frequent fogs occur over Middle Reach of Yangtze River (27°–32°N) and less frequent fogs appear over 32°–40°N in January–February (JF) during El Niño. The cause of this distinctive sub-seasonal evolution feature is discussed as the following. Actually we analyzed all meteorological fields during El Niño and La Niña, and found that they are approximately in a mirror image. To reduce the number of figures, we presented the difference fields in most of cases. We found that anomalous southwesterlies associated with El Niño penetrate into North China (up to 40°N) in ND. The northward moisture transport leads to near-surface air saturation over the region. Moreover, atmosphere becomes convectively unstable in South China (20°–30°N), which leads to a positive precipitation anomaly there. The local convergence leads to an anomalous divergence and subsidence north of 30°N. Both the saturated air and stable stratification lead to more frequent fog days in 30°–40°N. Compared to ND, anomalous southwesterly flow in JF is weaker, and can only transport moisture up to Central China (near 30°N). As maximum precipitation anomaly is confined near the southeastern coast of China, anomalous divergence and subsidence appear north of 27°N. This stable stratification together with the anomalous moisture transport causes the increase of fog over Central China but decrease of fog in North China (33°–38°N) due to the subsidence induced dryness. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	ENSO; Fog days; Moisture transport; Stability
语种	英语
scopus关键词	El Nino; El Nino-Southern Oscillation; fog; La Nina; moisture transfer; precipitation (climatology); winter; China
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/146362
作者单位	Key Laboratory of Meteorological Disaster, Ministry of Education (KLME)/Joint International Research Laboratory of Climate and Environmental Change (ILCEC)/Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters (CIC-FEMD), Nanjing University of Information Science and Technology, Nanjing, China; Department of Atmospheric Sciences and International Pacific Research Center, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI 96822, United States
推荐引用方式 GB/T 7714	Yu H.,Li T.,Liu P.. Influence of ENSO on frequency of wintertime fog days in Eastern China[J],2019,52(2020-09-10).
APA	Yu H.,Li T.,&Liu P..(2019).Influence of ENSO on frequency of wintertime fog days in Eastern China.Climate Dynamics,52(2020-09-10).
MLA	Yu H.,et al."Influence of ENSO on frequency of wintertime fog days in Eastern China".Climate Dynamics 52.2020-09-10(2019).