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Characteristics of inertia‐gravity waves over Gadanki during the passage of a deep depression over the Bay of Bengal
Author(s) -
Niranjan Kumar K.,
Ramkumar T. K.
Publication year - 2008
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2008gl033937
Subject(s) - troposphere , hodograph , bay , geology , gravity wave , radar , geodesy , atmospheric sciences , wave propagation , meteorology , oceanography , physics , optics , telecommunications , computer science
Using MST Radar located at the Indian tropical station of Gadanki (13.5°N, 79.2°E; near the eastern coast of India), studies have been made on the characteristics of inertia‐gravity waves generated in the lower troposphere during deep depression developed over the Bay of Bengal on 20–24 June 2007. Filtering and the hodograph analyses of horizontal winds indicate that the low‐pressure system has generated inertia gravity waves, propagating outward from the core of the depression. Strong enhancement of radar reflectivity (SNR) in the heights of ∼4–7 km for a few days around 22 June 2007 and the upward propagation of gravity wave energy above this height range indicate that the source of the waves is located at ∼4–7 km. This is in agreement with earlier theoretical expectations. The vertical and horizontal wavelengths of gravity waves are found to be ∼2.2 km and ∼240 km respectively in the troposphere.