Characteristics of inertia-gravity waves over Gadanki during the passage of a deep depression over the Bay of Bengal

• Published in: Geophysical research letters Vol. 35; no. 13; pp. L13804 - n/a
• Main Authors: Niranjan Kumar, K., Ramkumar, T. K.
• Format: Journal Article
• Language: English
• Published: Washington, DC American Geophysical Union 01-07-2008; Blackwell Publishing Ltd
• Subjects: Acoustic-gravity waves; Atmospheric Processes; Convective processes; Earth sciences; Earth, ocean, space; Exact sciences and technology; inertia gravity waves; Marine; Ocean/atmosphere interactions; Synoptic-scale meteorology; Tropical meteorology; Indian Ocean; Asia; Bay of Bengal; India; India, Andhra Pradesh, Gadanki; ISW, Bangladesh, Bengal Bay; inertia gravity waves; wavelength; Hodograph; Gravity inertial wave; low pressure; troposphere; drill cores; depressions; propagation; Gravity wave; winds; Height; filtering; radar methods; energy; Reflectance
• ISSN: 0094-8276; 1944-8007
• DOI: 10.1029/2008GL033937

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.