Raindrop size distributions of north indian ocean tropical cyclones observed at the coastal and inland stations in South India

Balaji Kumar Seela, Jayalakshmi Janapati, Chirikandath Kalath Unnikrishnan, Pay Liam Lin, Jui Le Loh, Wei Yu Chang, Utpal Kumar, K. Krishna Reddy, Dong In Lee, Mannem Venkatrami Reddy

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Abstract

The current study summarizes the raindrop size distributions (RSDs) characteristic of the North Indian Ocean (NIO) tropical cyclones (TCs) measured with ground-based disdrometers installed at the coastal (Thiruvananthapuram, 8.5335°N, 76.9047°E) and inland (Kadapa, 14.4742°N, 78.7098°E) stations in south India. The NIO TCs observed at the coastal station showed more midand large-size drops (>1 mm) than the inland station. On the other hand, for both inland and coastal stations, small and mid-size drops (<3 mm) primarily contributed to the total number concentration and rainfall rate. The RSDs of the NIO TCs segregated into precipitation types (stratiform and convective) demonstrated the presence of more mid- and large-size drops at the coastal station. The RSD relations of the NIO TCs, which are used in rain retrieval algorithms of remote sensing (global precipitation measurement) radars, exhibited contrasts between the coastal and inland station. Further, the NIO TCs’ rainfall kinetic energy relations, which are crucial in rainfall erosivity studies, estimated for the coastal station revealed dissimilar characteristics to that of the inland station. The conceivable thermo-dynamical and microphysical processes that are accountable for the disparities in the NIO TC RSDs measured at the coastal and inland stations are also elucidated in this work.

Original languageEnglish
Article number3178
JournalRemote Sensing
Volume13
Issue number16
DOIs
StatePublished - 2 Aug 2021

Keywords

  • Disdrometer
  • North Indian Ocean (NIO)
  • Raindrop size distributions (RSDs)
  • Rainfall kinetic energy
  • Rainfall rate
  • Tropical cyclones (TCs)

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