Surface ozone characterization at Larsemann Hills and Maitri, Antarctica

Area of Science:

• Atmospheric Chemistry
• Antarctic Science
• Ozone Layer Research

Background:

• Ozone concentration and variability are crucial for understanding atmospheric processes.
• Antarctic coastal regions present unique conditions for studying ozone dynamics.
• Previous research has highlighted the sensitivity of polar ozone to various environmental factors.

Purpose of the Study:

• To investigate the daily and diurnal variability of surface ozone at two Indian Antarctic stations.
• To analyze the relationship between ozone levels and meteorological parameters.
• To explore potential mechanisms driving ozone production and destruction in the Antarctic summer.

Main Methods:

• Analysis of daily average ozone concentrations and diurnal variations.
• Measurement of meteorological parameters including temperature, pressure, and wind speed.
• Data collection during the 28th Indian Scientific Expedition of Antarctica (2008-09).

Main Results:

• Daily average ozone concentration ranged from ~13-20 ppb at Larsemann Hills and ~16-21 ppb at Maitri.
• Photochemistry occasionally contributed to surface ozone, with halogen-induced destruction and advective transport playing roles.
• Ozone levels decreased during blizzards due to reduced production and increased removal processes.
• No significant diurnal variation in ozone concentration was observed at either station.

Conclusions:

• Surface ozone levels in coastal Antarctica are influenced by a complex interplay of photochemistry, halogen chemistry, and meteorological factors.
• Diurnal ozone cycles are not a prominent feature in these Antarctic summer coastal environments.
• Understanding these ozone dynamics is vital for monitoring atmospheric health in polar regions.