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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 28, issue 11
Ann. Geophys., 28, 2149-2159, 2010
https://doi.org/10.5194/angeo-28-2149-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 28, 2149-2159, 2010
https://doi.org/10.5194/angeo-28-2149-2010
© Author(s) 2010. This work is distributed under
the Creative Commons Attribution 3.0 License.

  26 Nov 2010

26 Nov 2010

Seasonal stratospheric intrusion of ozone in the upper troposphere over India

S. Fadnavis, T. Chakraborty, and G. Beig S. Fadnavis et al.
  • Indian Institute of Tropical Meteorology, Pune, India

Abstract. The Model for Ozone and Related chemical Tracers-2 (MOZART-2) is used to examine the evolution of pollutant O3 in the upper troposphere over the Indian region. Vertical profiles of ozone mixing ratio retrieved from Microwave Limb Sounder (MLS) aboard Earth Observing System (EOS) AURA satellite for the period 2005–2009 and Tropospheric Emission Spectrometer (TES) aboard (EOS) AURA for the period 2006–2007 has been analyzed. The satellite observations reveal the evidence of downward propagation of ozone (100–200 ppb) due to stratospheric intrusion during the winter and pre-monsoon seasons. The regular feature of enhancement of ozone in the upper troposphere over India is presented. Results obtained by the MOZART-2 simulations (for years 2000–2005) confirm the observations and indicate stratospheric intrusion of O3 during winter and pre-monsoon seasons. Observed enhanced O3 mixing ratio in the upper troposphere is explained by, variation of Potential Vorticity (PV), tropopause pressure, relative humidity and CO-O3 correlation.

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