EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Observed variability of Surface Ozone (O3) and its Precursors over the Indian Capital region

Ravi Kumar Kunchala1, Anshika Chandel1, Raju Attada2, Ramesh K Vellore3, and Vijay K Soni4
Ravi Kumar Kunchala et al.
  • 1Centre for Atmospheric Sciences, Indian Institute of Technology, Delhi,India (
  • 2Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research, Mohali, India ( )
  • 3Centre for Climate Change Research, Indian Institute of Tropical Meteorology, Pune, India ( )
  • 4Indian Meteorological Department, New Delhi Branch,Delhi (

Ozone (O3) is a greenhouse gas which plays different roles in stratosphere and troposphere. It also has an important role in radiative and chemical balance of the atmosphere, and thus the changes in O3 have greater climatic implications. Although O3 is present in trace amounts in troposphere, it is adequate to govern the oxidation processes in the Earth’s atmosphere by forming OH radicals, as the atmospheric lifetime of many gases is controlled by OH radicals. Rapidly developing countries in tropics and subtropics have realized the importance of tropospheric O3 studies as these regions have very limited measurements of ozone and its precursor gases. Understand the variability of the surface O3 and their association with precursors are extremely important for the policy decisions to mitigate the impacts of ozone on human health and crops and ozone air quality management issues in the region. This study investigates the variability of surface ozone (O3) its association with its precursors (NO, NO2, NOX, CO) at time scales of annual, seasonal and diurnal scales for the duration of three years using ground-based observations from IMD Ayanagar, IMD Lodhi road, CRRI, CV Raman, IGI Palam stations in the Indian Capital region. Further, we will present the back-trajectory analysis to elucidates the transport mechanisms/ pathways on the variability of ozone for the study region.

How to cite: Kunchala, R. K., Chandel, A., Attada, R., Vellore, R. K., and Soni, V. K.: Observed variability of Surface Ozone (O3) and its Precursors over the Indian Capital region, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-12767,, 2020