Centre for Atmospheric and Oceanic Sciences (CAOS)
Recent Submissions
-
A model-based investigation of the long-term climate and carbon cycle consequences of fossil fuel emissions, land use changes and negative emissions
In this thesis, we investigate the effects of anthropogenic perturbations such as fossil fuel emissions, deforestation, afforestation and negative emissions on the long-term climate and carbon cycle using simulations from ... -
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 ... -
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 ... -
Impact of 3D distribution of Black Carbon aerosols in the atmosphere on aerosol radiative forcing over the Indian region
Black Carbon (BC) aerosols are produced by the incomplete combustion of carbonaceous materials. While they constitute an insignificant mass-fraction of the composite atmospheric aerosols, their measurement is essential in ... -
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. ... -
A Tropical Survey of Mid-Tropospheric Cyclones, their Classification and Genesis over the Arabian Sea
Middle Tropospheric Cyclones (MTCs) are moist synoptic tropical systems with vorticity maxima in the middle troposphere and weak signature in the lower troposphere. We begin with a tropical survey of MTCs; in South Asia, ... -
Stirring and mixing driven by mesoscale eddies in the stratified Bay of Bengal
The stirring of passive tracers driven by altimetry-derived daily surface geostrophic currents is studied on subseasonal timescales in the Bay of Bengal. Advection of latitudinal and longitudinal bands highlights the chaotic ... -
Dynamics of river plumes in the Bay of Bengal
The Bay of Bengal (BoB) receives a large amount of freshwater through runoff from sev- eral rivers along its border. This large freshwater gain has severe implications on the dynamics and thermodynamics of the BoB as ... -
On the spatial extent of extreme rainfall events over India during the summer monsoon
The spatial extent of extreme rainfall events directly affects the damages caused and impacts of such events. However, it has been less explored in the literature. This thesis examines extreme rainfall events of different ... -
Estimation of Glacier Mass Balance at Basin Scale in the Himalaya for Recent Decades and Future
The Himalayan glaciers are a major source of perennial river systems which support the livelihood of millions of people in south Asia. Therefore, it is important to understand changes in water resources due to changes in ... -
Influence of Western Ghats Orography on Temporal and Spatial Distribution of Rainfall over South Asia
The Western Ghats (WG) orography that runs along the western coast of peninsular India, is a long and narrow mountain chain with an average height of about 1200 meters. The orientation of this orography is approximately ... -
Ab initio Quantum Chemical Studies on Kinetic Fractionation during the analysis of Carbonates for the Clumped Isotope Thermometry
Stable and clumped isotopic compositions of molecules and minerals carry the signatures of temperatures and other physical and chemical conditions of the time of their formation. Isotopic compositions of such precipitate ... -
Extremes of Indian Summer Monsoon Rainfall and Equatorial Indian Ocean Oscillation
Our studies suggest that the equatorial Indian Ocean Oscillation, which is the atmospheric component of Indian Ocean Dipole, is as important as El Nino and Southern Oscillation for the interannual variation of Indian Summer ... -
Bay of Bengal Freshwater in the tropical Indian Ocean
The annual total continental runoff into the Bay of Bengal (BoB) is more than half the runoff into the entire tropical Indian Ocean. The net freshwater (FW) content in the Bay of Bengal mixed layer increases from a minimum ... -
Moist and Dry Dynamics in Shallow Water and General Circulation Models
Various aspects of dry and moist atmospheric dynamics are explored through systems of varying complexity, ranging from a 2-D shallow water model to a more complex 3-D general circulation model. First, we examine the response ... -
Impact of Atmospheric Aerosols on Free-Space Optical Communication Systems
Free–space optical (FSO) communication is a wireless technology with an unguided laser signal carrying a large volume of data through the atmosphere. Numerous advantages such as higher bandwidth, high security, easy ... -
Multi-Scale Modeling of Moist Convection Over India
Clouds exist on all scales from turbulent processes to global scale and are organized on all the scales in between. They truly are multi-scale in nature. This makes them a very challenging simulation problem for atmospheric ...
RSS 1.0