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  Effect of prevailing meteorological conditions on lightning flash rate: Study over the Western part of India

Gangane, A., Priyadarshini, P., Dhangar, J., Pawar, S. D., Gopalakrishnan, v., Kumar, P. P. (2023): Effect of prevailing meteorological conditions on lightning flash rate: Study over the Western part of India, XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG) (Berlin 2023).
https://doi.org/10.57757/IUGG23-4048

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Item Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021488 Version Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5021488_1
Genre: Conference Paper

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 Creators:
Gangane, Abhijeet1, Author
Priyadarshini, Prajna1, Author
Dhangar, Jayesh1, Author
Pawar, Sunil D.1, Author
Gopalakrishnan, v1, Author
Kumar, P. Pradeep1, Author
Affiliations:
1IUGG 2023, General Assemblies, 1 General, International Union of Geodesy and Geophysics (IUGG), External Organizations, ou_5011304              

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 Abstract: Significant, year-to-year variations in pre-monsoon lightning activity over India have been observed, mainly because of variations in meteorological conditions that bring moisture over the Indian region. Intense surface heating during the pre-monsoon period can provide the required instability and lifting mechanism for thunderstorm formation; therefore, moisture availability plays an important role in India during this season. We have studied the year-to-year lightning variation over western India (15°-22°N, 72.5°-81°E) during 2014-2022 using Lightning Location Network (LLN) data of IITM Pune. The development of isolated thunderstorms and lightning in western India during the pre-monsoon season is generally due to the instability of the lower atmosphere created by the convergence near the ridgeline due to the high-pressure areas over the Bay of Bengal (BOB) and the Arabian Sea regions. This synoptic condition brings moisture over the study region from the BOB with a south-westerly wind circulation. Our observation shows lightning activity in the study region decreased sharply from 2014 to 2022. Earlier research has demonstrated that India's average annual mean wind speed rate decreased by -0.88 kmph/decade, with significant declines found in western India and the southern peninsula. Our observation, too, revealed that the pressure difference weakened between the high-pressure area over the BOB and the study region from 2014 to 2022. It is suggested that the reduction in the lightning activity over the study region may be due to the weakening of the pressure gradient between BOB and Western India, which was responsible for bringing less moisture over the study region.

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Language(s): eng - English
 Dates: 2023-07-112023-07-11
 Publication Status: Finally published
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 Identifiers: DOI: 10.57757/IUGG23-4048
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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Place of Event: Berlin
Start-/End Date: 2023-07-11 - 2023-07-20

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Title: XXVIII General Assembly of the International Union of Geodesy and Geophysics (IUGG)
Source Genre: Proceedings
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Publ. Info: Potsdam : GFZ German Research Centre for Geosciences
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