REPORT ON THE TOPICAL WORKSHOP

Transcription

1 REPORT ON THE TOPICAL WORKSHOP from the stratosphere to the ionosphere: coupling, boundary conditions and assumptions Paris, November 2012 organised in the framework of the ESSEM COST Action ES1005 TOSCA TOwards a more complete assessment of the impact of Solar variability on the Earth s Climate at University Paris VI, November Atmospheric models are the main tool by which the multiple impacts of solar variability on the Earth s atmosphere can be described and tested. The majority of these models address the lower atmosphere only (troposphere, and sometimes also stratosphere). Higher layers, which range from the stratosphere to the ionosphere, are now also receiving growing attention because of the impact of solar UV radiation and energetic particles. However, the description of the terrestrial atmosphere from the surface up to the thermosphere and ionosphere is a very complex problem when dealing with the solar forcing on the climate. Thanks to numerous new observations and recent progress in our understanding of how the thermosphere/ionosphere reacts to solar forcing, several models have recently improved the description of the middle and upper atmosphere. The prime objective of this workshop was to compare current numerical models for the middle and upper atmospheres and, in the light of the observations, to identify key issues, lacks and roads for future improvement. About 80 participants attended the workshop, coming mostly from Europe but also from the US and Canada. The programme was organised in such a way that each session was followed by ample time for discussion. Among the most significant achievements of this workshop were: The specification of the requirements of solar spectral irradiance for models in terms of spectral resolution, spectral coverage, etc. The various approaches chosen in several teams when describing the extension of the troposphere/stratosphere models up to the thermosphere, their main findings and conclusions on what should be done, The identification of few measurements needed to improve those models, among which a better knowledge of the O concentration in the mesosphere/thermosphere (related to the radiative cooling budget) and high resolution measurements of the electron distribution that precipitate into the atmosphere,

2 This workshop was supported by the French PNST (Programme National Soleil- Terre) and by TOSCA. The latter funded 9 participants, among which there were two young scientists. The meeting was hosted by LATMOS (Laboratoire Atmosphères, Milieux, Observations Spatiales) and held in the premises of the University of Paris VI. The main organisers were François Leblanc (LATMOS) and Jean Lilensten (IPAG). The workshop presentations can still be downloaded from the website with Username Password strattoiono november12 PROGRAMME Monday 26/11/12 9h30 Welcome The Sun Convener: T. Dudok de Wit 9h45-10h15 10h15-10h45 10h45-11h15 11h15-11h45 Natasha Krivova (MPI, Lindau) Models and reconstructions of solar spectral irradiance Gaël Cessateur (PMOD, Davos) Solar Spectral Irradiance: past, present and future Observations G. Thuiller (LATMOS, Paris) Comparison of Different Solar Spectral Irradiance Reconstructions 11h45-12h00 S. Melo (CSA, Quebec) Evaluating the impact of using different SSI reconstructions to calculate atmospheric solar heating rates as a function of altitude 12h00-12h15 12h15-12h45 C. Muller (BISA, Brussels) Solar irradiance measured from space: possible perturbing elements, mitigation and quality control procedures

3 12h45-14h15 14h15-14h45 14h45-15h00 15h00-15h15 15h45-16h15 16h15-16h45 16h45-17h15 17h15 17h30-19h15 From the surface to the upper atmosphere Conveners: S. Bekki, P. Keckhut, A. Hauchecorne F. Lott (LMD, Paris) Gravity Wave parameterizations in the LMDz- GCM Onishi T. et al. (LATMOS, Paris) Simultaneous observations of daytime MSTIDs by DEMETER satellite and GPS- TEC S. Melo (CSA, Quebec) Using airglow as a tool to evaluate atmospheric numerical models performance: results from the extended CMAM H. Schmidt (MPI, Hamburg) Solar- cycle signals in ECHAM- based models from the ocean to the mesosphere A. Hauchecorne (LATMOS, Paris) "Dynamics and chemical variability of the mesosphere: Internal causes and role of solar forcing" End of first day Welcome drink Tuesday 27/11/12 From the surface to the upper atmosphere (cnt d) Conveners: S. Bekki, P. Keckhut, A. Hauchecorne 9h00-9h30 9h30-10h00 10h00-10h30 10h30-11h00 11h00-11h30 11h30-11h45 11h45-12h00 E. Rozanov (PMOD, Davos) "Solar influence on the temperature in the lower tropical stratosphere" U. Berger (Leibniz Institute of Atmospheric Physics, Kühlungsborn) Solar cycle and long- term trends in the middle atmosphere effected by tropo- /stratospheric conditions M. Lopez- Puertas (IAA, Granada) "Non- LTE IR energy budget in the middle/upper atmosphere: Status and implementation in GCMs" D. Marsh (NCAR, Boulder) "Adding Aeronomy to a high- top climate model: lessons learned from the development of WACCM" J. Manners (UKMO) Vertical extension of UKMO model H. Schmidt (MPI, Hamburg) HAMMONIA

4 12h00-12h30 12h30-14h00 14h00-14h30 14h30-14h45 14h45-15h15 15h45-16h15 16h15-16h30 16h30-17h00 17h00 F. Forget (LMD, Paris) Extending a Global Climate Model to the thermosphere and ionosphere: the case of the LMD Mars GCM A. Vlasov (KIT, Karlsruhe) Coupling the thermosphere and the middle- atmosphere: the first experiences with EMAC- CMAT Ilya Usoskin (Univ. Oulu) Atmospheric ionization by cosmic rays: How to choose a proper model? A. Marchaudon (IRAP, Toulouse) A new interhemispheric model of ionosphere Non- sollicited contribution Non- sollicited contribution J.Y. Chaufray et al. (LATMOS, Paris) 3D Model of the Martian Ionospheric dynamics End of second day Wednesday 28/11/12 Particle Precipitation and chemistry Conveners: M. Marchand, F. Lefèvre 9h00-9h30 9h30-10h00 10h00-10h30 10h30-11h00 11h00-11h30 11h30-11h45 A. Seppälä (FMI, Helsinki) "Solar influence on the atmosphere through Energetic Particle Precipitation." K. Semeniuk (York University, Ontario) "Simulating effects of galactic cosmic rays, solar proton events and high energy electron precipitation in the Canadian Middle Atmosphere Model" M. Sinnhuber (KIT, Karlsruhe) "Impact of energetic particle precipitation on the chemical composition of the middle atmosphere: results from global models and comparison to observations" P. Verronen (FMI, Helsinki) "Ion chemistry affecting the minor neutral composition in the middle atmosphere" B. Funke (IAA, Granada) Stratospheric EPP- NO y deposition during as seen by MIPAS- Envisat: Contribution to the global NOy budget and implications for atmospheric modeling

5 11h45-12h00 12h00-12h30 12h30-14h00 14h00-14h15 14h15-14h30 14h30-14h45 14h45-15h00 15h00-15h15 15h45 H. Nieder (KIT, Karlsruhe) NO x production due to energetic particle precipitation in the MLT region results from an ion- chemistry model T. Reddmann (KIT, Karslruhe) Transport of NO x from the lower Thermosphere into the middle Atmosphere in the KASIMA Model P. E. Sheese et al. (University of Toronto) Antarctic night NO densities in the MLT: Odin, ACE, and WACCM K. Perrot et al. (CUT, Göteborg) Data sets for studying direct and indirect effects of high energetic particle precipitation on middle atmospheric composition by the Odin Sub- Millimeter Radiometer Kilifarska N. (NIG, Sofia) Ozone and ion chemistry of the lower stratosphere initiated by Galactic Cosmic Rays» F. Duruisseau (LPC2E, Orléans) One- dimensional numerical modeling of blue- jet and its impact on stratospheric chemistry End of the meeting Thierry Dudok de Wit 21 December 2012