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2016 Monsoon convection and its place in the large-scale circulation using doppler radars

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Doyle, A. J., Stein, T. H. M. orcid id iconORCID: https://orcid.org/0000-0002-9215-5397 and Turner, A. G. orcid id iconORCID: https://orcid.org/0000-0002-0642-6876 (2021) 2016 Monsoon convection and its place in the large-scale circulation using doppler radars. Journal of Geophysical Research: Atmospheres, 126 (22). e2021JD035496. ISSN 2169-8996 doi: 10.1029/2021JD035496

Abstract/Summary

Convective cloud development during the Indian monsoon helps moisten the atmospheric environment and drive the monsoon trough northwards each year, bringing a large amount of India’s annual rainfall. Therefore, an increased understanding of how monsoon convection develops from observations will help inform model development. In this study, 139 days of India Meteorological Department Doppler weather radar data is analysed for 7 sites across India during the 2016 monsoon season. Convective cell-top heights (CTH) are objectively identified through the season, and compared with near-surface (at 2 km height) reflectivity. These variables are analysed over three time scales of variability during the monsoon: monsoon progression on a month-by-month basis, active-break periods and the diurnal cycle. We find a modal maximum in CTH around 6–8 km for all sites. Cell-averaged reflectivity increases with CTH, at first sharply, then less sharply above the freezing level. Bhopal and Mumbai exhibit lower CTH for monsoon break periods compared to active periods. A clear diurnal cycle in CTH is seen at all sites except Mumbai. For south-eastern India, the phase of the diurnal cycle depends on whether the surface is land or ocean, with the frequency of oceanic cells typically exhibiting an earlier morning peak compared to land, consistent with the diurnal cycle of precipitation. Our findings confirm that Indian monsoon convective regimes are partly regulated by the largescale synoptic environment within which they are embedded. This demonstrates the excellent potential for weather radars to improve understanding of convection in tropical regions.

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Item Type Article
URI https://reading-clone.eprints-hosting.org/id/eprint/101167
Item Type Article
Refereed Yes
Divisions Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Publisher American Geophysical Union
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