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Impact of solar UV variability on sudden stratospheric warming with LMDz-Reprobus A. Hauchecorne 1, S. Bekki 1, M. Marchand 1, C. Claud 2, P. Keckhut 1,

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Presentation on theme: "Impact of solar UV variability on sudden stratospheric warming with LMDz-Reprobus A. Hauchecorne 1, S. Bekki 1, M. Marchand 1, C. Claud 2, P. Keckhut 1,"— Presentation transcript:

1 Impact of solar UV variability on sudden stratospheric warming with LMDz-Reprobus A. Hauchecorne 1, S. Bekki 1, M. Marchand 1, C. Claud 2, P. Keckhut 1, F. Lefèvre 1, D. Cugnet 1, S. Lefebvre 1, F. Lott 2, G. Thuillier 1 1)LATMOS, CNRS, UVSQ, UPMC 2)Laboratoire de Météorologie Dynamique, CNRS, UPMC, Ecole Polytechnique

2 Sun-atmosphere link: possible mechanisms Total solar irradiance: change surface and tropospheric temperature Solar UV:O3 production  stratospheric temperature  change in atmospheric circulation: amplification mechanism ? Particle precipitations (SPE, GCR, EPP) - SPE and EPP in auroral zone: NOx and HOx  atmospheric chemistry - GCR modulated by solar wind: condensation nuclei  clouds atmospheric chemistry chemistry

3 J. McCormack, 2004

4 Sudden Stratospheric Warming

5 Dynamics and transport LMDz: Extended version of the LMDz 4th generation GCM (Lott et al.) Tropospheric version largely used in the french community LMDz is the atmospheric component of the IPSL Earth System model (Dufresne et al.) Chemistry Reprobus: Chemistry-transport model (Lefèvre et al.) Chemical families O x, NO x, HO x, ClO x, BrO x et CHO x chemistry. Heterogeneous reactions: on aerosols and PSC particles PSC sedimentation (dehydration and denitrification) : irreversible vertical transfer of HNO 3 and H 2 O CCM LMDz-Reprobus

6 LMDZ-ReprobusMeteorological analysis ERA40 Zonal mean temperature

7 LMDz-Reprobus 30 years simulations: Minimum and maximum solar conditions for the 11-year solar cycle All the other forcings are kept constant: SSTs, sea ice, stratospheric aerosols, CFCs, GHGs

8 Difference in polar temperature (K) MIN MAX DIF 90°S90°N

9 LMDz-Reprobus solar max – solar min January Temperature February Wind

10 LMDz Reprobus solar max – solar min Temperature Ozone

11 Stratosphere -troposphere dynamical coupling From Baldwin and Dunkerton, JASTP, 2005

12 Conclusion The solar UV variability mechanism has been tested in LMDz- Reprobus There is an impact onstratospheric dynamics (sudden stratospheric warming) Future plans - Impact on the troposphere - Comparison with other models CMAM, SOCOL, IGCM-FASTOC - Common work on the evaluation of different solar forcings (TSI, UV, GCR, SPE, EEP)

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