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Modulation of thermal structure in the upper troposphere and lower stratosphere (UTLS) region by inertia gravity waves: A case study inferred from simultaneous MST radar and GPS sonde observations

Das, SS and Kumar, KK and Uma, KN and Ratnam, MV and Patra, AK and Das, SK and Ghosh, AK and Jain, AR (2014) Modulation of thermal structure in the upper troposphere and lower stratosphere (UTLS) region by inertia gravity waves: A case study inferred from simultaneous MST radar and GPS sonde observations. Indian Journal of Radio and Space Physics, 43 (1). pp. 11-23.

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Abstract

The observations of multiple layer structures in the MST radar backscattering echoes in the upper troposphere and lower stratosphere (UTLS) region are discussed in this paper. The fact remains same that the enhanced echoes seen in the radar backscattering are due to the strong positive and negative thermal gradients. Simultaneous observations of MST radar (1 hourly) and GPS sonde (6 hourly) over a tropical station Gadanki (13.5°N, 79.2°E) reveal the presence of 1.5-2 km vertical wavelength in the winds, temperature and radar backscattering echoes in the UTLS region during Indian summer monsoon (ISM). The analysis also reveals that the presence of inertia gravity wave (IGW) triggered due to tropical easterly jet (TEJ) associated with ISM is the prime candidate for the observed thermal gradients in the UTLS region.

Item Type: Article
Additional Information: CC Attribution-Noncommercial-No Derivative Works 2.5 India
Uncontrolled Keywords: Radar backscattering echo;Inertia gravity wave (IGW);Temperature gradient;Upper troposphere and lower stratosphere (UTLS);Zonal wind;Meridional wind
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 04 Dec 2014 09:32
Last Modified: 04 Dec 2014 09:32
URI: http://moeseprints.incois.gov.in/id/eprint/922

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