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 2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations Measure Chemical O 3 loss rate  SLIMCAT 3D CTM  Ozone and loss rate comparison.

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Presentation on theme: " 2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations Measure Chemical O 3 loss rate  SLIMCAT 3D CTM  Ozone and loss rate comparison."— Presentation transcript:

1  2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations Measure Chemical O 3 loss rate  SLIMCAT 3D CTM  Ozone and loss rate comparison  Correction factors Marambio Rotherara Davis Syowa Neumayer Belgrano South Pole McMurdo Dumont d’Urville Comparison of Observations During the First Antarctic Match Campaign with a 3D CTM W. Feng 1, M.P. Chipperfield 1 School of Earth and Environment, University of Leeds, UK Acknowledgments H.K. Roscoe 2, M. Rex 3, P. von der Gathen 3, M. Streibel 3, F.Goutail 4, G. Konig-Langlo 3, T. Deshler 5, B. Johnson 6, J. Easson 7, M. Yela 8, P. Taalas 9, K. Sato 10 Supported by NERC and SCOUT-O3 project

2 SLIMCAT/TOMCAT 3D CTM Off-line chemical transport model [Chipperfield, JGR, 1999] Extends to surface using hybrid  -  levels (SLIMCAT version). Variable horizontal/vertical resolution. Horizontal winds and temperatures from analyses (e.g. UKMO, ECMWF (ERA-40 or operational)). Vertical motion from diagnosed heating rates or divergence. Tropospheric physics: convection, PBL mixing etc. Chemistry: ‘Full’ stratospheric chemistry scheme (41 species, 160 reactions) with heterogeneous chemistry on liquid/solid aerosols/PSCs and an equilibrium denitrification scheme. NAT-based denitrification scheme included. http://www.env.leeds.ac.uk/slimcat

3 Arctic Ozone loss versus V PSC Chipperfield M.P., W. Feng and M. Rex(GRL, 2005) SLIMCAT now gives a realistic representation of ozone and inferred ozone loss for Arctic winters under different meteorological conditions New T42 run Obs Old T15 run New T15 run

4 Comparison with Observation Good agreement between Ozonesondes measurements and SLIMCAT 425K 460K 495K

5 Ozone loss rate at 450K Models reproduce the observed O 3 loss rate very well SLIMCAT Match CLAMS FMI Reprobus

6 The Mean and correction factors Mean ratio Correction factors  SLIMCAT is very consistence with observations between 400-650K but gives too much O3 below 400K  SLIMCAT can be used as a transfer standard to expose systematic differences between observations from the different ozonesonde sites and can provide corrections between them.

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