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Observation of Semiannual and Annual Oscillation in Equatorial Middle Atmospheric Long Term Temperature Pattern : Volume 27, Issue 11 (16/11/2009)

By Guharay, A.

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Book Id: WPLBN0003973803
Format Type: PDF Article :
File Size: Pages 8
Reproduction Date: 2015

Title: Observation of Semiannual and Annual Oscillation in Equatorial Middle Atmospheric Long Term Temperature Pattern : Volume 27, Issue 11 (16/11/2009)  
Author: Guharay, A.
Volume: Vol. 27, Issue 11
Language: English
Subject: Science, Annales, Geophysicae
Collection: Periodicals: Journal and Magazine Collection
Subcollection: Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Description: Aryabhatta Research Institute of observational scienES (ARIES), Nainital, India. Extensive measurement of middle atmospheric temperature with the help of lidar data of more than 10 years (1998–2008) and TIMED/SABER data of 7 years (2002–2008), has been carried out from a low latitude station, Gadanki, India (13.5° N, 79.2° E), which exhibits the presence of semiannual oscillation (SAO) and annual oscillation (AnO). The AnO component is stronger in the mesospheric region (80–90 km) and the SAO is dominant at stratospheric altitudes (30–50 km). Overall, the AnO possesses higher amplitude ~6–7 K, and the SAO shows less amplitude ~1–2 K. The AnO present at 90 km finds crest near summer solstice, and the same at 80 km shows peak near winter solstice with a downward progression speed ~1.7 km/month. The SAO propagates downward with an average phase speed ~9 km/month and phase maximizes around equinox and solstice at 50 and 30 km, respectively. The observed SAO has also shown seasonal asymmetry in peaks.

Observation of semiannual and annual oscillation in equatorial middle atmospheric long term temperature pattern

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