Diurnal variation over the tropical monsoon regions during northern summer 1991

Download
Author
Jiminez, Greg M
Date
1997-03Advisor
Chang, Chih-Pei
Chu, Peter C.
Metadata
Show full item recordAbstract
This study examines diurnal variation of convection over western India, the Bay of Bengal, Indochina and the northern South China Sea during the 1991 northern summer monsoon using combined Japanese (GMS) and Indian (INSAT) geostationary satellite data, ECMWF 850 hPa wind data, and NCEP sea surface temperature analyses. The diurnal cycle is examined in terms of spatial and temporal structure prior to onset and during the monsoon. The northern South China Sea is examined to determine how different periods of synoptic influences resulted in an anomalously strong diurnal signal during June. The wind and SST data are used to examine the relationship between the diurnal variation of convection and both low level convergence and vertical latent heat fluxes. Convection over west India is most common during May and June and starts as a diurnal system over land that becomes organized and propagates westward over the east Arabian Sea. The Bay of Bengal follows the classic land-sea breeze model and convection is modulated by convergence between the land breeze and large- scale monsoon flow. The diurnal cycle is generally enhanced over the ocean during active phases of convective activity. The maximum latent heat fluxes generally occurs prior to maximum convection due to strong monsoon flow enhancing evaporation
Collections
Related items
Showing items related by title, author, creator and subject.
-
A composite study of the Madden-Julian Oscillation (MJO) and northeasterly cold-surges during the northern winter monsoon
Simms, John W. (Monterey, California. Naval Postgraduate School, 2000-03-01);During the northern winter monsoon, the Madden-Julian Oscillation (MJO) and northeasterly cold-surges are active over the eastern Indian Ocean and western Pacific. The MJO consists of an active (wet) phase and inactive ... -
A Theory for the Tropical Tropospheric Biennial Oscillation
Chang, C.-P.; Li, Tim (2000-07-15);The key questions of how the tropospheric biennial oscillation (TBO) maintains the same phase from northern summer in South Asia to southern summer in Australia, and how the reversed phase can last through three locally ... -
Low-Frequency Transitions of a Simple Monsoon System
Webster, Peter J.; Chou, Lang C. (1979);Seasonal, diurnal and synoptic time scales, plus a subseasonal modulation" of synoptic events, appear to dominate the temporal structure of monsoon systems. Observational studies indicate that the latter low-frequency ...