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Gravity Wave Activities Associated With Convective Phenomena at a Tropical Location Near Land‐Sea Boundary
Author(s) -
Jana Soumyajyoti,
Rakshit Gargi,
Maitra Animesh
Publication year - 2020
Publication title -
radio science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.371
H-Index - 84
eISSN - 1944-799X
pISSN - 0048-6604
DOI - 10.1029/2019rs006952
Subject(s) - radiosonde , gravity wave , tropical cyclone , climatology , atmospheric sciences , environmental science , stratosphere , convection , african easterly jet , outgoing longwave radiation , meteorology , geology , gravitational wave , tropical wave , physics , astrophysics
Abstract The seasonal analysis of gravity wave activity has been made for the present tropical location, Kolkata (22.5726°N, 88.3639°E) using radiosonde and European Centre for Medium‐Range Weather Forecasts 60 model level data. Gravity wave generated due to intense tropical cyclone Aila has also been investigated using European Centre for Medium‐Range Weather Forecasts 91 model level data over the Indian region. The gravity wave energy calculated from temperature and wind perturbation profiles show a significant enhancement during convective activities as indicated by a low outgoing longwave radiation. The pattern of zonal and meridional wind shears plays an important role in determining the seasonal variation of gravity wave activities. An intrusion of water vapor into the lower stratosphere over the cyclone affected region is detected from European Centre for Medium‐Range Weather Forecasts 91 model level data. The dominant vertical wavelengths of gravity waves in the range of 2.5–3.2 km are found from spectral analysis of wind and temperature perturbations during the tropical cyclone.