Recursos de colección

ETD at Indian Institute of Science (2.800 recursos)

Repository of Theses and Dissertations of Indian Institute of Science, Bangalore, India. The repository has been developed to capture, disseminate and preserve research theses of Indian Institute of Science.

Centre for Atmospheric and Oceanic Sciences (caos)

Mostrando recursos 1 - 3 de 3

  1. Role of Aerosols in Modulating the Intraseasonal Oscillations of Indian Summer Monsoon

    Bhattacharya, Anwesa
    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 coupled with Chemistry (WRF-Chem) simulations. The Tropical Rainfall Measurement Mission (TRMM) based Microwave Imager (TMI) estimates (2A12) have been used to compare and contrast the characteristics of cloud liquid water and ice over the Indian land region and the surrounding oceans, during the pre-monsoon (May) and monsoon (June–September) seasons. Based on the spatial homogeneity of rainfall, we have selected five regions for our study (three over ocean,...
    - 06-dic-2017

  2. A Tale of Two Gradients : Atmospheric Dynamics in an Inhomogeneous Background

    Monteiro, Joy Merwin
    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 in a mid-latitude -plane. We begin by a consistent derivation of the forced quasi-geostrophic equations on a -plane to understand the constraints placed by geostrophy on the time scale of condensation. We see that the presence of meridional gradients of moisture results in a slowdown of the waves. On the introduction of zonal gradients of moisture, the waves become unstable, and for certain parameters which are representative...
    - 30-nov-2017

  3. Modeling of Solar Radiation Management : A Comparison of Simulations using Reduced Solar Constant and Stratospheric Aerosols

    Sirisha, K
    The climatic effects of Solar Radiation Management (SRM) geoengineering have been often modeled by simply reducing the solar constant. This is most likely valid only for space sunshades and not for atmosphere and surface based SRM methods. In this thesis, a global climate model is used to test if the climate response to SRM by stratospheric aerosols and uniform solar constant reduction are similar. Our analysis shows that when global mean warming from a doubling of CO2 is nearly cancelled by both these methods, they are similar when important surface and tropospheric climate variables are considered. However, a difference of...
    - 22-nov-2017

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