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Tropical Teleconnections to the Indian Summer Monsoon in Observations and in a Coupled Model
An accurate seasonal prediction of Indian summer monsoon rainfall (ISMR) holds immense importance for the socio-economic well-being of South-Asian countries, as it directly impacts agricultural output and overall economies. ...
Revisiting the General Circulation of the Tropics
This thesis examines some aspects of the tropical general circulation. First, we consider the zonal momentum budget of the tropical upper troposphere. Our motivation is the zonal inhomogeneity of the Earth that presents ...
Arabian Sea High Salinity Core in the Bay of Bengal
The Summer Monsoon Current (SMC) advects high salinity water from the Arabian Sea into the Bay of Bengal (BoB) during the summer monsoon. This high salinity water subducts and enters the BoB as a subsurface high salinity ...
Extratropical Influence on the Sub-seasonal Rainfall Deficit in Indian Summer Monsoon
The variability of Indian monsoon on a range of timescales - seasonal to interannual to decadal - has been studied and characterised extensively over the past several decades. On the mechanistic front, the role ...
Intense Rainfall Events over the West Coast of India
West coast of the Indian peninsula is one of the regions which receive very heavy
rainfall during the summer monsoon season. Average June-September rainfall over
the parts of coastal Karnataka, Konkan and Goa exceed 250 ...
Investigating controls on intraseasonal convection and the abrupt seasonal transition in the boundary layer during monsoons
As solar insolation increases in the northern hemisphere during boreal summer, it is
accompanied by an abrupt change in the circulation associated with the monsoons as well as
heightened intraseasonal convective activity ...
Poleward propagating Tropical Intraseasonal Oscillations over the Indian Ocean
The mechanisms of poleward propagation of tropical intraseasonal oscillations (ISOs) are not well-understood. In this thesis, we investigate this issue for two such tropical ISOs over the Indian Ocean, namely, the Boreal ...
Role of equatorial convection and moisture in the structure and propagation of Boreal Summer Intraseasonal Oscillations
Boreal Summer Intraseasonal Oscillation (BSISO) is the dominant mode of tropical variability
during Boreal summers. BSISO is manifested by northward propagation of the
Maximum Cloud Zone (MCZ) from the warm equatorial ...
An investigation of the sensitivity of climate feedbacks to the latitudinal distribution of radiative forcing using the radiative kernel approach
It is well known that climate sensitivity, defined as the global mean surface temperature change per unit radiative forcing, depends on the forcing agents (such as CO2, CH4, O3, aerosols, solar radiation, land cover change, ...
An Energetics Perspective for the Response of the Indian Summer Monsoon to Land Processes in a Coupled General Circulation Model
The Indian summer monsoon is a coupled land-ocean-atmosphere phenomenon that supplies about 80% of the annual rainfall that the region receives. The monsoon season typically begins on June 1 st with a steep rise in rainfall ...