scholarly journals An experimental study of radiative fluxes in the south Bay of Bengal during BOBMEX 1999

2003 ◽  
Vol 112 (2) ◽  
pp. 267-281
Author(s):  
K. Gopala Reddy ◽  
G. Bharathi ◽  
A. Ravi Kumar ◽  
M. V. Subrahmanyam ◽  
K. Muni Krishna
Keyword(s):  
Experimental Study ◽  
Bay Of Bengal ◽  
The South ◽  
Radiative Fluxes

Characteristics of Precipitating Convective Systems in the South Asian Monsoon

2011 ◽  
Vol 12 (1) ◽  
pp. 3-26 ◽  
Author(s):  
Ulrike Romatschke ◽  
Robert A. Houze
Keyword(s):  
South Asian ◽  
Diurnal Cycle ◽  
Bay Of Bengal ◽  
Arabian Sea ◽  
Asian Monsoon ◽  
South Asian Monsoon ◽  
Western Himalayas ◽  
The South ◽  
Convective Systems ◽  
Large Systems

Abstract Eight years of Tropical Rainfall Measuring Mission (TRMM) Precipitation Radar (PR) data show how convective systems of different types contribute to precipitation of the South Asian monsoon. The main factor determining the amount of precipitation coming from a specific system is its horizontal size. Convective intensity and/or number of embedded convective cells further enhance its precipitation production. The precipitation of the monsoon is concentrated in three mountainous regions: the Himalayas and coastal ranges of western India and Myanmar. Along the western Himalayas, precipitation falls mainly from small, but highly convective systems. Farther east along the foothills, systems are more stratiform. These small and medium systems form during the day, as the monsoon flow is forced upslope. Nighttime cooling leads to downslope flow and triggers medium-sized systems at lower elevations. At the mountainous western coasts of India and Myanmar, small and medium systems are present throughout the day, as an orographic response to the southwesterly flow, with a slight superimposed diurnal cycle. Medium systems are favored over the eastern parts of the Arabian Sea and large systems are favored over the Bay of Bengal when an enhanced midlevel cyclonic circulation occurs over the northern parts of these regions. The systems forming upstream of coastal mountains over the Bay of Bengal are larger than those over the Arabian Sea, probably because of the moister conditions over the bay. The large systems over the bay exhibit a pronounced diurnal cycle, with systems forming near midnight and maximizing in midday.

scholarly journals O3 and CO in the South Asian outflow over the Bay of Bengal: Impact of monsoonal dynamics and chemistry

2020 ◽  
Vol 233 ◽  
pp. 117610
Author(s):  
Imran A. Girach ◽  
Nidhi Tripathi ◽  
Prabha R. Nair ◽  
Lokesh K. Sahu ◽  
Narendra Ojha
Keyword(s):  
South Asian ◽  
Bay Of Bengal ◽  
The South

scholarly journals Influence of upper level troughs and ridges on the formation of post-monsoon cyclones in the Bay of Bengal

MAUSAM ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 7-24
Author(s):  
S. N. SEN
Keyword(s):  
Tropical Cyclones ◽  
Cross Sections ◽  
Bay Of Bengal ◽  
Middle Latitude ◽  
Northeast India ◽  
Contributory Factor ◽  
The South ◽  
Minimum Requirement ◽  
Post Monsoon ◽  
Upper Level

The upper air conditions at the formative stages of several depressions and cyclones in the Indian seas were studied by Desai and Rao in the light of Riehl model for the formation of tropical cyclones. The recent introduction of twice daily radiosonde-rawin ascents at some stations in India provided additional facilities for similar studies in this area. The available upper air conditions associated with the formation of two post-monsoon cyclones of 1955 in the Bay of Bengal  were accordingly studied with the idea of finding how far Riehl's theory of tropical cyclones could be applied in these cases.   The present study of the post-monsoon cyclones of 1955 reveals that two radiosonde ascents a day from a reasonable network of stations should be minimum requirement for studies of this kind, Time cross-sections showing 24-hour changes of heights at intervals of 12 hours are presented to illustrate the sequence of movement of upper troughs and ridges. As postulated by Riehl, the formation of both the cyclones was apparently associated with the passage of troughs in the westerlies across northeast India, i.e., to the north of the area of cyclogenesis. But the upper air data from the available network of stations were too inadequate for drawing any definite conclusion as to whether the initial mass divergence at upper level was caused by the southward extension of the westerly trough and the superposition of its forward portion over the surface incipient low, or by the in-phase superposition of the upper trough in the westerlies with the upper tropospheric vortices moving across the Bay of pour Bengal, Dynamical development to the south of a confluent trough in the westerlies is suggested as a possible , contributory factor for the cyclogenesis in the south Bay of Bengal.   The influence of the middle-latitude trough on the recurvature of one of the cyclones while out at sea and of 453474 another similar cyclone of October 1949 which had recurved only after crossing the coast, and the unexpected weakening of the former while out at sea, have been discussed.

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