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Working Group on Surface Fluxes Report Elizabeth Kent National Oceanography Centre, Southampton

Working Group on Surface Fluxes Report Elizabeth Kent National Oceanography Centre, Southampton. WGSF Report. Appointments of all WG members have expired However recent activities include: OceanObs'09 (report in Session 9 under " in situ issues")

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Working Group on Surface Fluxes Report Elizabeth Kent National Oceanography Centre, Southampton

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  1. Working Group on Surface FluxesReportElizabeth Kent National Oceanography Centre, Southampton

  2. WGSF Report • Appointments of all WG members have expired • However recent activities include: • OceanObs'09 (report in Session 9 under "in situ issues") • Community White Paper organized by WGSF, also contributions to other CWP and Plenary papers. • Participation in Joint SEAFLUX/US CLIVAR Working Group on High Latitude Surface Fluxes Meeting: Surface Fluxes: Challenges for High Latitudes, March 2010 • Also article for Bull. American Met. Soc. • The SURFA Project - working to increase involvement, led by Andy Brown at Met Office • Work on solar flux calibration/intercomparison measurement meeting BSRN standards • Imminent submission of review article on on surface production of sea spray aerosols (Rev. Geophys)

  3. WGSF Report: SURFA • Archive of model output archived by NCDC, presently • ECMWF & DWD model output • OceanSITES observations • Project to obtain data from several centres for 2008/2009

  4. SURFA: Wind and Temperature Comparisons: Oct 2008 SST 10m wind speed Zonal wind Air temperature Meridional wind ECMWF – green; DWD – blue; Buoy – red dots. ECMWF – green; magenta + warm layer DWD – blue; Buoy – red dots.

  5. WGSF: Radiation measurement • Extremely hard to meet standards set by GEWEX Baseline Surface Radiation Network (BSRN) from marine platforms • Work to improve accuracy • Calibration • Intercomparision • Improved sensors and mountings • If BSRN-standard measurements are to be made over the ocean, this sort of work is essential

  6. Intensive work to improve measurements Guidelines * Yearly calibrations * Ensemble comparisons useful * Ventilation and/or quartz domes * Microvolt accuracy on data logger * Pyranometer –calibration coefficient is critical * Pyrgeometer –dome/case temperature calibration is critical (0.1˚C = 3 W/m^2) * Sun tracking * Pitch/roll leveling

  7. Priority to extend observations to high latitudes Satellites are key to give sampling, but in situ desperately needed for cal/val Activity led by SEAFLUX and US CLIVAR Hi-lat Flux WG Hi-lat Issues: Severe motion corrections Contamination by salt Flow distortion Surface boundary conditions Extreme cold, icing, frost formation, fog/rain impact Poor signal to noise, weak stratified turbulence A lack of field programs focused on parameterization

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