Centre for Atmospheric and Oceanic Sciences (CAOS): Recent submissions
Now showing items 21-40 of 89
-
Trends and Variability in Terrestrial Carbon Fluxes and Stocks over India in the 20th and 21st centuries: A Multi-model Based Assessment
Terrestrial ecosystems play an important role in the global carbon cycle by naturally taking up carbon from the atmosphere through photosynthesis and storing this carbon as biomass and soil carbon. There exists a strong, ... -
Physical controls of chlorophyll distribution in the North Indian Ocean
The north Indian Ocean is one of the highly productive regions among the tropical oceans. Being a prominent monsoon regime, the basin exists as a highly dynamic region charac- terised by intense mixing and upwelling and ... -
Energetics of monsoon variability over the last 22,000 years
The interpretation of proxies of paleo monsoons has been based primarily on changes in incident solar radiation. The role of feedbacks has not been examined in depth. In this thesis, we have used a diagnostic model 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 ... -
Effects of aerosols and atmospheric boundary layer dynamics on refractive index fluctuations: implications for Free-Space Optical communication
Laser communication through atmospheric channels is an emerging wireless technology, commonly known as Free-Space Optical (FSO) communication. It facilitates unprecedented channel capacity and very large bandwidth, favouring ... -
Intraseasonal Variability in Aquaplanet Configuration of Community Atmosphere Model
The Intraseasonal Oscillation (ISO) plays an important role to modulate deep convective activity in the tropical region. In this thesis, I aim to understand the role of land and warm oceans in ISO, using a general ... -
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 ... -
Assessment of Direct Radiative Effects of Aerosols using Assimilated Datasets over the Indian Region
Uncertainties in estimation of radiative effects of aerosols, pose the primary challenge for the accurate climate impact assessment of aerosols. Especially, over the Indian region which is characterized by significant ... -
Efficacy of Solar irradiance, Methane and Black carbon aerosols
In climate science literature, the concept of radiative forcing is used to infer the equilibrium temperature change that would occur as a result of changes in the forcing agents such as greenhouse gases and aerosols. ... -
Impact of river runoff into the ocean on climate in a coupled model
In order to study the impact of global runoff, sensitivity experiment (NoRiv) was carried out by shutting down the entire runoff into the ocean for a period of 200 years. The changes in NoRiv, compared to the reference ... -
Impact of Local and Remote Land-Atmosphere Coupling on the Indian Summer Monsoon
India lies on the edge of the Asian summer monsoon domain and receives almost 80% of its annual rainfall during June to September (referred as Indian summer monsoon rainfall: ISMR). The dominant forcing behind inter-annual ... -
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 Earths hydrological cycle and climate. For example, Riehl and Malkus (1958) estimated that the vertical transport of ... -
Characteristics of Convective Clouds Over the Indian Monsoon Zone from Weather Radar Data
Deep convective clouds play an important role in global energy balance through vertical transport of water vapor, momentum and energy, altering radiation and also influence hydrological cycle via precipitation. These clouds ... -
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. ... -
Effect of Rainfall and River Discharge on the North Indian Ocean
In the north Indian Ocean, the Bay of Bengal (BoB or bay) and the Eastern Arabian Sea (EAS) receive a huge amount of rainfall during summer. Several rivers along their boundaries discharge enormous amounts of freshwater ... -
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 ... -
Installation and Operation of Air-Sea Flux Measuring System on Board Indian Research Ships
(2018-07-04)Exchange of mass (water vapor), momentum, and energy between atmosphere andocean has profound influence on weather and climate. This exchange takes place at the air-sea interface, which is part of the marine ... -
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 ... -
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 ... -
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 ...