Ozone and Chlorine Chemistry in the Stratosphere

Ozone has been vital for sustaining life and making earth habitable. Without Ozone
life on earth would be restricted only to the oceans. Ozone provided the shield and
allowed life to leave ocean and populate land.

Anthropogenic activities during the
Industrial revolution led to emissions of certain ozone destructing gases such as
CFCs and other chlorine and bromine containing species in the atmosphere.
Results were significant decrease in stratospheric ozone levels, especially over
Antarctic during spring.

My research explores the chemistry and dynamics of
stratospheric ozone layer. I am examining long-term changes in the Earth’s ozone
layer and how such changes may influence climate. I analyse different satellite and
ground based observations seeking for signs of recovery in ozone levels. My
research focus is on estimation and attribution of long-term trends of stratospheric
trace species like O3, HCl, ClO measured from various satellite observations.

I am closely investigating chlorine as an ozone destructing species, as well. This is
because a single chlorine atom has the capacity to destroy thousands of ozone


My vision is to gain an understanding on the science of ozone evolution during the “ Anthropocene” and when it is expected to recover to pre- industrial levels. I hope to understand present and future of ozone during our times.


Humans have altered the composition of the atmosphere. Human-induced changes
in the global climate system and in stratospheric ozone pose a range of health risks.
Stratospheric ozone changes can impact climate by changing the large-scale
atmospheric state. Stratospheric ozone acts as a sponge, absorbing the very harmful
UV rays from Sun.

Changes in ozone means change in the amount of UV radiation
that reaches the surface, both impacting surface temperatures and biogenic
processes. Thirty years after the worldwide ban on Ozone depleting substances
(ODSs) following the Montreal Protocol 1987, it is important to
ensure that the International agreement and its subsequent revisions are still
accomplishing their objectives. My focus is on understanding the current status of
this protective shield of the atmosphere. Also, I am motivated to understand the
major factors expected to control stratospheric ozone in the rest of this century.

Hopefully through my research, I can contribute to the scientific community and
every living species on planet Earth.


• Utpal Kanti Mukhopadhyay, Richa N. K. Sharma, Shamama Anwar, Atma Deep Dutta:
Correlating Thermal Anomaly with Earthquake Occurrences Using Remote Sensing. AMLTA
2019: 863-875 DOI: 10.1007/978-3-030-14118-9_85