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DOI	10.1007/s00382-018-4458-y
	Widespread fog over the Indo-Gangetic Plains and possible links to boreal winter teleconnections
	Hingmire D.; Vellore R.K.; Krishnan R.; Ashtikar N.V.; Singh B.B.; Sabade S.; Madhura R.K.
发表日期	2019
ISSN	0930-7575
起始页码	5477
结束页码	5506
卷号	52 期号:2020-09-10
英文摘要	Boreal wintertime planetary-scale atmospheric circulations and their possible consequences to widespread fog occurrences over the Indo-Gangetic Plains (IGP) region of the Himalayan valley are investigated in this study. Among the different fog types, radiation fog type seen at night or early morning hours favored by large-scale subsidence aloft and strong near-surface inversion is focused in this study. A composite analysis reveals that upper air circulation associated with 105 fog days over the IGP region show a trail linked to circulation anomalies over the Eurasian continents and the Arctic Circle. The findings suggest that there is a footprint of the Arctic Oscillation (AO) and conventional Eurasian (EU) circulation patterns linked to anticyclonic circulation aloft over the IGP region. Although widespread IGP fog occurrences under the large-scale subsidence environment are seen to occur during both phases of AO, the negative AO phase (high pressure environment over the Arctic Circle) portends a greater likelihood for fog occurrences in the IGP region. A coupling of positive mid-tropospheric height anomalies over western Eurasia and the anticyclonic circulation anomalies over the IGP region is evident during the IGP fog periods concomitant with EU positive (height excess over Siberia) phase. Further, anomalous circulation over the IGP region during the fog periods appears to rely more on the strength of the AO negative phase than the circulation strengths over Eurasia. On the contrary, the Eurasian circulation largely appears to influence the subsidence aloft over the IGP region irrespective of the strength of the AO positive phase. It is also noted that upper-air circulation during non-foggy periods over the IGP region has conformity with positive AO phase and rapidly progressing EU pattern. These planetary-scale teleconnection pathways offer new dynamical insights into comprehending widespread IGP fog scenario, which have been hitherto perceived mostly from a regional context. © 2018, Springer-Verlag GmbH Germany, part of Springer Nature.
语种	英语
scopus关键词	anticyclone; Arctic Oscillation; atmospheric circulation; atmospheric dynamics; fog; teleconnection; troposphere; winter; Eurasia; Gangetic Plain; Siberia
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/146350
作者单位	Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, 411 008, India; Department of Atmospheric and Space Sciences, Savitribai Phule Pune University, Pune, India; National Data Centre, India Meteorological Department, Pune, India; Department of Physics, Modern College of Arts, Sciences and Commerce, Pune, India
推荐引用方式 GB/T 7714	Hingmire D.,Vellore R.K.,Krishnan R.,et al. Widespread fog over the Indo-Gangetic Plains and possible links to boreal winter teleconnections[J],2019,52(2020-09-10).
APA	Hingmire D..,Vellore R.K..,Krishnan R..,Ashtikar N.V..,Singh B.B..,...&Madhura R.K..(2019).Widespread fog over the Indo-Gangetic Plains and possible links to boreal winter teleconnections.Climate Dynamics,52(2020-09-10).
MLA	Hingmire D.,et al."Widespread fog over the Indo-Gangetic Plains and possible links to boreal winter teleconnections".Climate Dynamics 52.2020-09-10(2019).