Browsing Centre for Atmospheric and Oceanic Sciences (CAOS) by Title
Now showing items 87-106 of 115
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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 ... -
Space-Time Evolution of the Intraseasonal Variability in the Indian Summer Monsoon and its Association with Extreme Rainfall Events : Observations and GCM Simulations
(2018-03-01)In this thesis, we investigated modes of intraseasonal variability (ISV) observed in the Indian monsoon rainfall and how these modes modulate rainfall over India. We identified a decreasing trend in the intensity of ... -
Space-time variability of near-surface salinity in the Bay of Bengal
Freshwater from monsoon rain and rivers leads to a 5-10 m deep low-salinity layer in the north Bay of Bengal from August to February. The thin fresh layer, with strong stratification at its base, is highly responsive to ... -
Spatio-temporal characteristics of precipitating clouds and rainfall over the Western Ghats of India
One of the heaviest rainfall receiving regions during the Indian summer monsoon season is anchored around the orographic barriers of the Western Ghats (WG) in peninsular India. The high rainfall is attributed to the forced ... -
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 ... -
Structure and Dynamics of the Inter-tropical Convergence zones
(2018-08-13)The east-west oriented cloud bands in the tropics are called the Inter-tropical Con-vergence Zones (ITCZ). Till recently, the ITCZ has been assumed to have a simple vertical structure with convergence near the surface ... -
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 ... -
Surface Energy Budget Over A Land Surface In The Tropics
(2009-05-21)Atmospheric convection is sensitive to the nature of the surface and its temperature. Both dry (without cloud) and moist (with cloud) convections depend on the surface temperature. Surface temperature is of critical ... -
A Tale of Two Gradients : Atmospheric Dynamics in an Inhomogeneous Background
(2017-11-29)The effects of a non-zero background state on atmospheric dynamics is explored through simple models and observations. Firstly, we examine the effects of moisture gradients on the stability and propagation of Rossby waves ... -
Temporal Persistence and Spatial Coherence of Tropical Rainfall
(2018-01-01)The work presented in the thesis focuses on systematically documenting the multi scale nature of the temporal persistence and spatial coherence of tropical rainfall. There are three parts to the thesis: The first two parts ...