EGU General Assembly 2008
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  Information - AS3.21 The dry deposition process at the substrate- to global scale (co-sponsored by ILEAPS; co-listed in BG & OS)

Event Information
Recent findings indicate the importance of a realistic representation of gaseous and aerosol deposition processes in large-scale models to secure a fair model evaluation and the role of dry deposition in the global burden of gases and aerosols. It has also been demonstrated that commonly applied approaches to calculate dry deposition in large-scale models, providing first-order estimates of the efficiency of removal by substrates (e.g., cuticle, soils, snow) for those gases for which no measurements are available, should be revisited. Deploying recently developed measurement technology has resulted in direct observations of surface exchanges of a selection of compounds. These observations do not only suggest a different uptake efficiency compared to the commonly applied approach but have also indicated about the important role of emission and dry deposition interactions urging for a more coupled model representation of surface exchanges. The observations are generally conducted over vegetation with a limited number of observations of ocean-, cryosphere and bare soil- atmosphere exchanges. This measurement bias poses a serious limitation to the implementation of dry deposition in- and use of Earth system models to assess the potential consequences of anticipated climate- and global change on atmospheric chemistry and climate.

This session aims at reviewing the current status of the knowledge concerning the dry deposition process and establishing the needs and activities within different research communities such as IGBPs iLEAPS, SOLAS and IGAC and the ACCENT and air quality community. We particularly invite presentations that focus on the introduction of more mechanistic representations of substrate- to global scale removal processes, studies that address interactions between surface emissions and removal, and in particular but not exclusively, presentations that address dry deposition- or surface exchange fluxes of gases and aerosols over non-vegetated surfaces.

Preliminary List of Solicited Speakers
Senior Scientist Dr. Lise Lotte Soerensen, Denmark

Co-Sponsorship
iLEAPS, the Integrated Land Ecosystem-Atmosphere Processes Study of IGBP

General Statement
The information contained hereafter has been compiled and uploaded by the Session Organizers via the "Organizer Session Form". The Session Organizers have therefore the sole responsibility that this information is true and accurate at the date of publication, and the conference organizer cannot accept any legal responsibility for any errors or omissions that may be made, and he makes no warranty, expressed or implied, with regard to the material published.



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