AS Atmospheric Sciences
The 2018 Outstanding Student Poster and PICO (OSPP) Awards is awarded to Evgenia Galytska for the poster/PICO entitled:
NO2 and O3 changes in tropical mid-stratosphere during 2004-2012 by means of a chemistry-transport model (Galytska, E.; Rozanov, A.; Chipperfield, M. P.; Dhomse, S.; Burrows, J. P.)
Click here to download the poster/PICO file.
Evgenia Galytska is a PhD student in the working group of Prof. John. P. Burrows FRS in the Institute of Environmental Physics at the University of Bremen, Germany. Her research interests are based on chemistry-transport modelling coupled with observations from different satellite platforms (e.g. SCIAMACHY, SAGE-II, OSIRIS, MIPAS) to test the understanding of the physico-chemical mechanisms determining stratospheric composition. In particular, she studies the conversion of photochemically active species (i.e. NO2), and the attribution of long-term changes in ozone, O3, and nitrogen dioxide, NO2, in the tropical middle stratosphere. Evgenia also collaborates with the working group of Prof. Martyn P. Chipperfield, University of Leeds, UK through using the TOMCAT 3D chemical transport model.
The PICO presented at the EGU 2018 provides a step-by-step explanation of the mystery of ozone decline in the tropical stratosphere at altitudes around 30-35 km, observed by SCIAMACHY measurements during 2004-2012. This ozone decrease had been previously identified by several groups, but the reasons for observed changes remained disputed. In the presented research, the seasonal dynamical control (via the age-of-air diagnostic) of chemical processing has been unambiguously identified as the cause behind the observed variation from the comparisons of TOMCAT model simulations and satellite observations.