CY6115 : Chemistry of the Earth’s atmosphere

Introduction to the Earth’s Atmosphere:

Evaluation of the Earth‘s atmosphere – Layers of atmosphere – Pressure and Temperature variations – Scaling of atmospheric processes.

Role of Chemical Compounds on Ozone budget:

Chemical composition of the Earth‘s atmosphere – Compounds containing Sulfur, Nitrogen, Carbon, Halogens – Atmospheric Ozone – Ozone loss – role of the chemical compounds – Atmospheric lifetimes – Theories – Determination of the lifetimes – Laser Induced Fluorescence Studies (LIF measurements) – Cavity Ring Down method; Radicals in the Earth‘s atmosphere – Ozone generation – Global warming – Global Warming Potential (GWP) – Ozone Depletion Potential (ODP)

Chemistry of Troposphere and Stratosphere:

Troposphere – Chemistry of hydroxyl radicals – Photochemical cycles of NO2, NO and O3 – Chemistry of NOx and carbon monoxide – Methane – Tropospheric reservoir molecules – H2O2, CH3OOH, HONO, PAN, Role of VOC and NO x in the ozone formation – Chemistry of VOCs – sulfur compounds – nitrogen compounds;

Stratosphere – Chapman mechanism – HOx cycle – Halogen cycles – Antarctic ozone hole – Polar stratospheric clouds – Heterogeneous stratospheric chemistry –

Global sulfur and carbon cycles – Role of H2O in both troposphere and the stratosphere.

Atmospheric Radiation and Photochemistry:

Radiation – Terrestrial and solar radiation – Energy balance for Earth and Atmosphere – Radiative flux – Actinic flux; Photochemistry – Absorption of radiation by atmospheric gases – Absorption by O2 and O3 – Photolysis rate as a function of altitude – Photodissociation of O3, NO2.

Aerosols and Other Physical Processes:

Aerosols – formation – Size distribution – Chemical composition – thermodynamics of aerosols; Nucleation – Classical theory of homogeneous nucleation – Experimental measurement of nucleation rates – heterogeneous nucleation; Wet and dry deposition.

Text Books:

  1. Atmospheric chemistry and Physics by John H. Seinfeld, Spyros N. Pandis; Second edition, John Wiley, 1997.
  2. Introduction to Atmospheric Chemistry by Daniel J. Jacob, Princeton University Press, 1999.
  3. Introduction to Atmospheric Chemistry by Peter V. Hobbs, Cambridge University Press, 1st edition, 2000.
  4. Chemistry of Atmospheres: An Introduction to the Chemistry of the Atmospheres of Earth, the Planets, and Their Satellites by Richard P. Wayne, Cambridge University Press, 3rd edition, 1991.