Centre for Atmospheric and Oceanic Sciences (CAOS): Recent submissions
Now showing items 1-20 of 125
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Study of deep clouds over the indian region using insat-1B pixel data
In Earth’s atmosphere, a variety of clouds exist, and the present thesis is about the study of deep convective clouds, whose tops extend up to and beyond the mid troposphere. Deep convective clouds are often organized in ... -
Comparison of RADIATIVE FLUXES from INSAT and ERBE
Accurate knowledge of radiative fluxes at the top of the atmosphere (TOA) is necessary to study the variability of climate. The Indian geostationary satellite INSAT has been measuring radiative fluxes in a narrow spectral ... -
Comparison of microwave radiative transfer models and Retrieval of Humidity using Satellite Microwave Data
Water vapor plays an important role in tropical climate through its impact on Earth’s radiation budget. Accurate knowledge of the spatial and temporal distribution of water vapor is a fundamental requirement for understanding ... -
Vertical structure of convective clouds using the TRMM PR data
Very small fractional area (0.1%) occupied by the cumulonimbus (Cb) clouds belies their importance in Earth's hydrological cycle and climate. For example, Riehl and Malkus (1958) estimated that the vertical transport of ... -
Outflow of continental aerosols from peninsular India to Bay of Bengal
Aerosols are complex entities to assess in the atmosphere. This complexity arises due to their high variability both spatially and temporally, because of the different types of sources at different locations and their ... -
Annual cycle of sea surface temperature in the North Indian Ocean
Sea surface temperature (SST) plays a pivotal role in determining Earth’s climate and its variability through air-sea interaction. Therefore, understanding the variation of SST on different spatio-temporal scales is one ... -
Empirical Prediction and Predictability of Dry and Wet Spells of the Indian Summer Monsoon
n active (break) phase of intraseasonal oscillation (ISO) of the Indian summer monsoon is associated with a wet (dry) spell over the monsoon trough region and a dry (wet) spell over the equatorial Indian Ocean. Prediction ... -
Experimental investigation of turbulent bursts in the atmospheric surface layer over the tropics
Turbulence, an important characteristic of the atmospheric boundary layer (ABL), is mainly responsible for the transport of heat, moisture, momentum, pollutants, etc., in the atmosphere. As with any turbulent flow, our ... -
Impact of water mass forcing on the general circulation model simulations
The mass continuity equation traditionally used in atmospheric models does not take into account the local sources and sinks. The mass of the atmosphere varies due to the moisture variation arising from evaporation and ... -
Seasonal variation of the zonally symmetric tropical circulation in a simple climate ,model
A low-order model of the zonally symmetric tropical circulation is developed. The model equations are linearized about a resting basic state and are solved on an equatorial beta-plane. The circulation is forced by the solar ... -
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 ... -
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 ... -
Intraseasonal oscillations and interannual variability of the Indian summer monsoon
Several modeling studies show that the predictability of the seasonal mean Indian summer monsoon is limited due to a significant fraction of the interannual variability of the seasonal mean being governed by internal chaotic ... -
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 ... -
Patterns of variability of Indian monsoon Rainfall
The study of variability of southwest monsoon (SWM) rainfall is of considerable scientific importance. The complexities in understanding the behaviour of SWM rainfall are due to the strong space–time variation involved in ... -
New parameterization of atmospheric heating for simple models of relelvance to ENSO
The El Niño Southern Oscillation (ENSO) phenomenon, which is one of the strongest signals of interannual variability in the tropics, arises out of strong interactions between the tropical ocean and the atmosphere. ... -
Impact of changes in temporal resolution and convective parameterization on the simulation of tropical climate in NCAR CAM3 GCM
In this thesis, the simulation of tropical climate by the Community Atmospheric Model (CAM) developed at National Center for Atmospheric Research (NCAR) has been discussed. Although the model successfully simulates many ... -
Structure and Dynamics of the Inter-tropical Convergence zones
The east-west oriented cloud bands in the tropics are called the Inter-tropical Convergence Zones (ITCZ). Until recently, the ITCZ has been assumed to have a simple vertical structure with convergence near the surface ... -
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. ...