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Quantifying Arctic ozone loss using a chemical transport model and satellite measurements

Advisor’s Name



NCAS Scientist

Professor of Atmospheric Chemistry


NCAS, School of Earth and Environment, University of Leeds, Leeds, LS2 9JT





Research Interests and Current Projects

Stratospheric ozone layer depletion and recovery; Chemistry of the whole atmosphere; Global modelling of stratospheric and tropospheric chemistry and transport; Chemistry-climate interactions; Climate change.

Current Projects:

1)      NCAS (UK National Centre for Atmospheric Science) Climate (2011-

2)      NOx/HOx production & impacts on stratospheric O3 (NOHO): (2013-2016)

3)      NCEO (UK National Centre for Earth Observations) (2013-

4)      Cosmic Dust in the Terrestrial Atmosphere (CODITA): (2012-2017)

5)      Atmospheric impact of close cometary encounter: (2015-2018)

Title of the URP

Quantifying Arctic ozone loss using a chemical transport model and satellite measurements

URP Host

x  Advisor’s Institution          USTC

URP Financial Support

x  No       Living Cost       Traveling Cost    

  Living and Traveling Cost

  Others (please specify):

URP Start Time

18 July 2016



2 September 2016

Brief Description of the URP

The Antarctic ozone hole has been a subject of extensive scientific investigation since its discovery in the mid-1980s because the stratospheric ozone layer shields our planet from damaging UV light. Thus ozone depletion increases solar radiation at the surface thereby increasing the risk of damage to humans, flora and fauna (Chipperfield et al., 2015). Similarly, there is still large stratospheric polar ozone loss (15-35 km) in the colder winters in the Arctic region (Chipperfield et al., 2005). Significant progress has been made in understanding the processes controlling stratospheric ozone changes during the recent decades through measurements and model simulations (e.g. Feng et al., 2011). Recently, Hand (2016) reported that a possible record Arctic ozone hole may occur in the winter/spring 2015/16 due the extreme persistent low stratospheric temperature this year. Therefore, we will investigate the stratospheric Arctic polar ozone depletion for 2015/16 using our off-line 3-D chemical transport model (CTM) TOMCAT/SLIMCAT and satellite observations (e.g., MLS) and compare with previous winters (Feng et al., 2007). TOMCAT/SLIMCAT is a NCAS community CTM which contains a detailed description of stratospheric and tropospheric chemistry as well as a detailed aerosol module. The model has been widely used to study transport and chemistry in the upper troposphere and lower stratosphere (UTLS) (e.g., Mahieu et al., 2014; Dhomse et al., 2015; Hossanini et al., 2015) and also for WMO ozone assessment and described in detail by Chipperfield (2006,


For this project, the student will learn the atmospheric transport and chemistry in the stratosphere and be trained to analyze the model output (large data sets) and satellite observations. The student will also quantify the stratospheric ozone loss for Arctic winter/spring for 2015/16 and compare with previous winters using model simulations and satellite data.


Chipperfield, M.P., W. Feng, and M. Rex, Arctic Ozone Loss and Climate Sensitivity: Updated Three-Dimensional Model Study, Geophys. Res. Lett., Vol. 32, No. 11, L11813, 10.1029/2005GL022674, 2005.

Chipperfield, M.P., New version of the TOMCAT/SLIMCAT off-line chemical transport model: Intercomparison of stratospheric tracer experiments, Q.J.R. Meteorol. Soc., 132, 1179-1203, 10.1256/qj.05.51,2006.

Chipperfield, M.P., S.S. Dhomse, W. Feng, R.L. McKenzie, G. Velders and J.A. Pyle, Quantifying the ozone and ultraviolet benefits already achieved by the Montreal Protocol, Nat. Commun., 6:7233 doi: 10.1038/ncomms8233 (2015). 

Dhomse, S.,M.Chipperfield, W. Feng, R. Hossaini, G. Mann and M. Santee, Revisiting the hemispheric asymmetry in mid-latitude ozone changes following the Mount Pinatubo eruption: A 3-D model study, Geophys. Res. Lett., DOI: 10.1002/2015GL063052, 2015. 

Feng W., M.P. Chipperfield, S. Davies, P. von der Gathen, E. Kyro, C. M. Volk, A. Ulanovsky, G. Belyaev, Large Chemical Ozone Loss in 2004/05 Arctic Winter/Spring, Geophys. Res. Lett., 34, L09803, doi:10.1029/2006GL029098, 2007.

Feng, W., Chipperfield, M. P., Davies, S., Mann, G. W., Carslaw, K. S., Dhomse, S., Harvey, L., Randall, C., and Santee, M. L.: Modelling the effect of denitrification on polar ozone depletion for Arctic winter 2004/2005, Atmos. Chem. Phys., 11, 6559-6573, doi:10.5194/acp-11-6559-2011, 2011. 

Hand, H., Record ozone hole may open over Arctic in the spring, Science, 351, doi:10.1126/science.351.6274.650, 2016.

Hossaini, R., M.P. Chipperfield, S. Montzka, A. Rap, S. Dhomse, and W. Feng, Efficiency of short-lived halogens at influencing climate through depletion of stratospheric ozone, Nat. Geos., doi:10.1038/ngeo2363, 2015.

Mahieu, E.,M. P. Chipperfield,J. Notholt,T. Reddmann,J. Anderson,P. F. Bernath,T. Blumenstock,M. T. Coffey, S. S. Dhomse,W. Feng,B. Franco,L. Froidevaux,D. W. T. Griffith,J. W. Hannigan,F. Hase,R. Hossaini, N. B. Jones,I. Morino,I. Murata,H. Nakajima, M. Palm,C. Paton-Walsh,J. M. Russell III,M. Schneider, C. Servais,D. Smale and K. A. Walker, Recent Northern Hemisphere stratospheric HCl increase due to atmospheric circulation changes, Nature, 515, 104-107, doi:10.1038/nature13857, 2014.

Requirements for Students

and Prerequisite Courses

Good communication skills in EnglishGood computing skillsFortran or IDLStatisticsAtmospheric Sciences