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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 ...
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 ...
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 ...
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 ...
A Method to Derive an Aerosol Composition from Downward Solar Spectral Fluxes at the Surface
(2018-01-01)
Aerosol properties are highly variable in space and time which makes the aerosol study more complex. The sources and production mechanism of aerosols decide the properties of the aerosols. Aerosol radiative forcing is ...
Formation and Maintenance of the Southern Bay of Bengal Cold Pool
(2018-06-11)
Around Sri Lanka and to the south of India sea surface temperatures (SST) are cooler compared to the surrounding region during summer monsoon. This region where SSTs are relatively cooler is known as the cold pool. Owing ...
Effects of Arctic Geoengineering on Precipitation in the Tropical Monsoon Regions
(2018-06-14)
Arctic geoengineering wherein sunlight absorption is reduced only in the Arctic has been suggested as a remedial measure to counteract the on-going rapid climate change in the Arctic. Several modelling studies have shown ...
Mesoscale Turbulence on the Ocean Surface from Satellite Altimetry
(2018-06-26)
The dynamics captured in the ocean surface current data provided by satellite altimetry has been a subject of debate since the past decade. In particular, the contribution of surface and interior dynamics to altimetry ...
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 ...
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 ...