EarthRef.org Reference Database (ERR)
Development and Maintenance by the EarthRef.org Database Team

Detailed Reference Information
Jagannadha Rao et al. 2002
Jagannadha Rao, V.V.M., Venkat Ratnam, M. and Narayana Rao, D. (2002). Study of mean vertical motions over Gadanki (13.5°N, 79.2°E), a tropical station, using Indian MST radar. Radio Science 37: doi: 10.1029/2001RS002505. issn: 0048-6604.

Long-term mean vertical velocities observed by the Mesosphere-Stratosphere-Troposphere (MST) radar over a tropical station, Gadanki, India (13.5¿N, 79.2¿E), are presented for the first time in this paper. Profiles of mean vertical velocities show wave like structure with a vertical wavelength of ~6 km, and the observed values range from 3 to 20 cm s-1 on average. During monsoon and postmonsoon seasons, larger magnitudes are observed up to 20 cm s-1. From the present study, an interesting feature, reversal in vertical velocities from downward to upward between 5 and 10 km during the monsoon season, is observed. This upward motion in long term averaged vertical velocity is thought to be due to reversal in wind direction around this height range and also due to horizontal velocity convergence, which is frequently observed over this region. One more reversal is observed near the Tropical Easterly Jet (TEJ) (around 16 km), which is from downward to upward and always showing minimum vertical velocities close to zero. This reversal can be attributed to instabilities associated with the jet streams. Large negative values are observed in the lower troposphere below 6 km, which are attributed to large vertical wind variances observed in this region indicating gravity wave activity.

BACKGROUND DATA FILES

Abstract

Keywords
Meteorology and Atmospheric Dynamics, General circulation, Meteorology and Atmospheric Dynamics, Middle atmosphere dynamics (0341, 0342), Meteorology and Atmospheric Dynamics, Tropical meteorology
Journal
Radio Science
Publisher
American Geophysical Union
2000 Florida Avenue N.W.
Washington, D.C. 20009-1277
USA
1-202-462-6900
1-202-328-0566
service@agu.org
Click to clear formClick to return to previous pageClick to submit