Evolutionary Features of Marine Atmospheric Boundary Layer (MABL) over the Arabian Sea and the Onset of Monsoon over Kerala during ARMEX-2003 |
| |
Authors: | S G Nagar A R Dhakate P Seetaramayya |
| |
Institution: | (1) Indian Institute of Tropical Meteorology, Dr. Homi Bhabha Road, Pune, 411 008, India;(2) D4, Niranjan Complex, Pashan, Pune, 411 021, India |
| |
Abstract: | In this study an attempt has been made to examine the evolutionary features of the dynamic and thermodynamic characteristics
of the marine atmosphere over the South-East Arabian Sea near 9.22°N, 74.51°E just two to three days prior to the onset of
southwest monsoon over Kerala during 2003 and seek the linkages with the large-scale flow in the lower and middle troposphere
at that time over the region. The marine meteorological data collected onboard ORV Sagarkanya as part of the experiment ARMEX-2003
for 4–8 June, 2003 are used. The monsoon onset over Kerala occurred on 8 June, 2003. The observed changes in the marine atmospheric
boundary layer (MABL) characteristics just two days prior to the onset are discussed. It is observed that the MABL increased
in height up to 4 km on 6 June from an initial height 2.8 km on 5 June. The top of the MABL dried up (Relative Humidity RH
~ 30–40%) with weak and variable winds throughout the day on 6 June while the air at 850 hPa is relatively humid (RH ~ 50–80%)
but not saturated. A sequential increase in RH is associated with a change in the winds from southwesterly to westerly from
6 June onwards until the onset date. The changes in the lower and middle troposphere flow patterns over the Arabian Sea and
Indian region are highlighted. |
| |
Keywords: | ARMEX onset of monsoon conserved variables deep convection |
本文献已被 SpringerLink 等数据库收录! |
|