Gopikrishnan G S

Prime Minister's Research Fellow,

Atmospheric and Climate Science Laboratory (ATMOS Lab)

Centre for Ocean, River, Atmosphere and Land Sciences (CORAL)

Indian Institute of Technology Kharagpur

Breath of Fresh Air:

Combating Tropospheric Ozone for a Cleaner Tomorrow!

Unmasking the Global Climate Crisis: Science, Impacts and Actions.

The Enigmatic World of Tropospheric Ozone: Atmospheric Chemistry - Climate Interactions

Ozone is a gas made up of three oxygen atoms. It occurs naturally in small (trace) amounts in the upper atmosphere (the stratosphere). Ozone protects life on Earth from the Sun’s ultraviolet (UV) radiation. In the lower atmosphere (the troposphere) near the Earth’s surface, ozone is created by chemical reactions between air pollutants from vehicle exhaust, gasoline vapors, and other emissions. At ground level, high concentrations of ozone are toxic to people and plants.

My Ph.D Academic Journey

SELECTED PUBLICATIONS

Aerosol inhibition on photochemical surface ozone formation under future climate and air quality scenarios

G.S. Gopikrishnan, D.M. Westervelt and J. Kuttippurath

Higher aerosol uptake enhances radical sinks, increasing surface ozone levels by 40–60% in 2018.
North America, Europe and East-Asia remain under an aerosol-inhibited photochemical regime (AIR) in future scenarios.
However, total AIR extent reduces in both near and distant future simulations.

No severe ozone depletion in the tropical stratosphere in recent decades

J. Kuttippurath, G.S. Gopikrishnan, R. Muller, S. Godin-Beekmann, J. Brioude

Stratospheric ozone is an important constituent of the atmosphere. Significant changes in its concentrations have great consequences for the environment in general and for ecosystems in particular
The amount of column ozone in the tropics is relatively small (250–270 DU) compared to high and mid-latitudes
In addition, the tropical total ozone trend is very small , as estimated for the period 1998–2022.
The current understanding and observational evidence do not provide any support for the possibility of an ozone hole occurring outside Antarctica today with respect to the present-day stratospheric halogen levels.

Global tropical and extra-tropical tropospheric ozone trends and radiative forcing deduced from satellite and ozonesonde measurements for the period 2005–2020

G.S. Gopikrishnan and J. Kuttippurath

Tropospheric ozone (TPO) is significantly rising in the global tropics (0.2–0.4 DU/yr).
TPO shows regional insignificant negative trends in the southern hemisphere (0.1–0.2 DU/yr).
Multi-Linear Regression can explain 95% variability of tropical tropospheric ozone.
Ozone induced radiative forcing (RF) in the tropics is within the range ±0.5 W/m2.
Ozone-driven RF makes a temperature rise of 0.2–0.3 °C from 2006 to 2020.

Validation of INSAT-3D and INSAT-3DR temperature profile retrievals using ground-based, satellite and reanalysis data

G.S. Gopikrishnan, J. Kuttippurath, P.K. Thapliyal and M.V. Shukla

This study makes use of collocated measurements of INSAT-3D and INSAT-3DR with those from 18 radiosondes, Atmospheric Infrared Sounder (AIRS), and reanalysis data within the troposphere (1,000–100 hPa) to validate INSAT temperature profiles
Daytime temperature retrievals from INSAT‐3DR have been improved by 0.5–1 K
Nighttime observations have a similar bias (1–2 K) and RMSD for both INSAT‐3D and 3DR