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2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations

Marambio. Rotherara. Belgrano. Neumayer. South Pole. McMurdo. Syowa. Dumont d’Urville. Davis. 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.

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2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations

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  1. Marambio Rotherara Belgrano Neumayer South Pole McMurdo Syowa Dumont d’Urville Davis Comparison of Observations During the First Antarctic Match Campaign with a 3D CTMW. Feng1, M.P. Chipperfield1School of Earth and Environment, University of Leeds, UK • 2003 Antarctic Match campaign June-Oct 2003 nine Ozonesonde stations Measure Chemical O3 loss rate • SLIMCAT 3D CTM • Ozone and loss rate comparison • Correction factors Acknowledgments H.K. Roscoe2, M. Rex3, P. von der Gathen3, M. Streibel3, F.Goutail4, G. Konig-Langlo3, T. Deshler5, B. Johnson6, J. Easson7, M. Yela8, P. Taalas9, K. Sato10 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 VPSC New T42 run Obs New T15 run Old T15 run 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

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

  5. Ozone loss rate at 450K Match SLIMCAT CLAMS FMI Models reproduce the observed O3 loss rate very well Reprobus

  6. Correction factors The Mean and correction factors Mean ratio • 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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