气候变化领域集成服务门户(CCPortal): Spatial patterns of long-term trends in thunderstorms in India

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DOI	10.1007/s11069-021-04644-6
	Spatial patterns of long-term trends in thunderstorms in India
	Sen Roy S.; Roy S.S.
发表日期	2021
ISSN	0921030X
起始页码	1527
结束页码	1540
卷号	107 期号:2
英文摘要	Long-term trends in the frequency of thunderstorm days are investigated using fifty years of data recorded by weather observatories throughout India. An attempt has been made to identify whether the trends are spatially cohesive and collocated with regions with maximum of thunderstorm days. This analysis of trends is significant, since most of the weather over India is of convective origin and has devastating impact on life and property. There are three thunderstorm maximum regions (a) northwest Indian Himalayas and adjoining Pakistan, (b) east India and (c) extreme southern parts of peninsular India. The results of the study revealed on a monthly scale, the frequency of thunderstorm days has a consistent spatially cohesive decreasing trend over east central and northeast India, collocated with the intra-annually shifting maximum of thunderstorm activity. The trend is more diffused for the thunderstorm maxima over north and south peninsular India. Comparison with rainfall trends from previous studies indicates that this decreasing trend of thunderstorm days is in phase with decreasing trends in rainfall activity over east central and northeast Indian regions. Detailed analysis indicates that frequency of thunderstorm days over these regions decreased during the latter half of the twentieth century followed by gradually increasing trend. This corresponds to a global warming hiatus and matches similar findings around the world. It seems likely that the decreasing moisture inflow from the surrounding oceans into the Indian subcontinent throughout the year due to weakening of the land-sea thermal gradient is causing a decreasing trend in the convection during this period. Over north and south peninsular India, where circum-global planetary waves play an important role in triggering convection, the strengthening of these waves offsets the effect of the generally decreasing moisture. © 2021, The Author(s), under exclusive licence to Springer Nature B.V. part of Springer Nature.
关键词	Extremes India Monsoon Thunderstorm Trends
英文关键词	atmospheric convection; atmospheric moisture; comparative study; extreme event; global warming; monsoon; rainfall; spatial data; storm deposit; thunderstorm; trend analysis; India
语种	英语
来源期刊	Natural Hazards
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/206552
作者单位	India Meteorological Department, New Delhi, India; Department of Geography and Regional Studies, University of Miami, Coral Gables, FL, United States
推荐引用方式 GB/T 7714	Sen Roy S.,Roy S.S.. Spatial patterns of long-term trends in thunderstorms in India[J],2021,107(2).
APA	Sen Roy S.,&Roy S.S..(2021).Spatial patterns of long-term trends in thunderstorms in India.Natural Hazards,107(2).
MLA	Sen Roy S.,et al."Spatial patterns of long-term trends in thunderstorms in India".Natural Hazards 107.2(2021).