Pre-monsoon to monsoon change in direction of vertical motions in the tropical lower troposphere from UHF radar observations

Details Pre-monsoon to monsoon change in direction of vertical motions in the tropical lower troposphere from UHF radar observations Pre-monsoon to monsoon change in direction of vertical motions in the tropical lower troposphere from UHF radar observations

Aug 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3515808e&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 15, CiteID L15808

Physics

1

Radio Science: Radar Atmospheric Physics (1220), Atmospheric Processes: Tropical Meteorology, Atmospheric Processes: Instruments And Techniques

Scientific paper

Multi-height vertical wind data in the lower troposphere (1.05 - 3.75 km) obtained from Wind Profiler/UHF radar at Pune (18°32'N, 73°51'E), India during June 2003 - May 2006 has been used here to investigate the seasonal evolution in the vertical structure, especially the change taking place from pre-monsoon (March - May) to south west monsoon (June - September) season. Vertical motions are predominantly upward during winter (December - February) and are strongly downward during pre-monsoon. A transition from downward to upward motion takes place around early June coinciding with the local onset of SW monsoon. Kinetic energy computed from zonal and meridional winds is small in magnitude during pre-monsoon but shows an abrupt and explosive increase around the time onset of monsoon. The results thus provide an observational evidence of existence of strong subsidence in the lower troposphere during pre-monsoon which weakens and vertical winds turn upward signaling the arrival of monsoon conditions.

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