Browsing Centre for Atmospheric and Oceanic Sciences (CAOS) by Title
Now showing items 78-97 of 115
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Radiative effects of aerosols over land and ocean
The last two centuries have witnessed tremendous growth on all fronts (especially industrial) compared to what had occurred in the past thousands of years. This growth brought along, in addition to the awareness of safety ... -
The Retrieval of Aerosols above Clouds and their Radiative Impact in Tropical Oceans
(2018-03-01)Aerosols affect the global radiation budget which plays an important role in determining the state of the Earth's climate. The heterogeneous distribution of aerosols and the variety in their properties results in high ... -
Retrieval Of Dust Aerosols Using METEOSAT Infrared Radiance
(2011-05-04) -
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 ... -
Role of Aerosols in Modulating the Intraseasonal Oscillations of Indian Summer Monsoon
(2017-12-05)In this thesis, we have presented a systematic analysis of the change of cloud properties due to variation in aerosol concentration over Indian region using satellite observations, and Weather Research and Forecasting Model ... -
Role of buoyancy in driving upper ocean mixing across timescales
This thesis explores the response of the upper ocean to surface buoyancy fluxes on different timescales using theory, numerical simulations and observation-based datasets. First, we investigate the role of evaporation in ... -
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 ... -
Role Of Sea Surface Temperature Gradient In Intraseasonal Oscillation Of Convection In An Aquaplanet Model
(2016-11-15)In this thesis we examine intra-seasonal oscillations (ISO) in the aqua-planet setup of the Community Atmospheric Model (CAM) version 5.1, mainly based on July and January climatological sea surface temperature (SST). We ... -
Satellite derived chlorophyll a distribution in the Bay of Bengal during northeast monsoon
The Bay of Bengal is a semi-enclosed tropical ocean basin driven by the monsoon winds. The Bay receives a large quantity of freshwater from river discharges and rainfall, which leads to very low salinity values in the ... -
Scaling Characteristics Of Tropical Rainfall
(2016-11-15)We study the space-time characteristics of global tropical rainfall. The data used is from the Tropical Rainfall Measuring Mission (TRMM) and spans the years 2000-2009. Using anomaly fields constructed by removing a single ... -
Seasonal and Intraseasonal Variation of Tropical Climate in NCAR CCM2 General Circulation Model : Sensitivity to Cumulus and Surface Processes
In this thesis, we have undertaken a detailed study of the role of surface processes and the effect of changes in cumulus parameterization on the simulation of tropical climate by the CCM2 model of NCAR. We have examined ... -
Seasonal cycle of the hydrography and circulation of the Bay of benga
The Bay of Bengal is the smaller of the two semi-enclosed basins of the North Indian Ocean. Due to the impact of monsoons, the Bay exhibits strong seasonal changes in the circulation and in salinity of its surface layer. ... -
The Seasonal ENSO Transition Mode of the Southern Hemisphere: Definition, Characteristics and Impact
Decadal climate variability (DCV) exerts a profound influence on the global climate system by shaping background oceanic and atmospheric conditions. It drives long-term changes in sea surface temperatures (SSTs), monsoon ... -
Sensitivity of Sea Surface Temperature Intraseasonal Oscillation to Diurnal Atmospheric Forcings in an OGCM
(2018-04-05)Abstract The diurnal cycle is a dominant mode of sea surface temperature (SST) variability in trop-ical oceans, that influences air-sea interaction and climate processes. Diurnal variability of SST generally ranges from ... -
Short to Medium Range Forecasting Skills of the GFS Model
The reliable prediction of the South Asian monsoon rainfall and its variability is crucial for various hydrological applications and early warning systems. This study analyzes Global Fore- cast System (GFS) model generated ... -
Simulations of Aerosol Species over the Indian Region: Evaluation and Improvements
Increasing aerosol loading over the south Asian region, holds a potential of, perturbing the south Asian monsoon system and the Himalayan glacial coverage, and thus affecting lives of (1/4)th of the world’s population. ... -
Simulations of tropical surface sinds : Seasonal cycle and International variability
Tropical climate variability is strongly influenced by coupled ocean-atmosphere interactions. The sea surface temperature (SST) influences the atmospheric heating through evaporation and convergence of moisture. The ...