Working Group on Surface FluxesReport
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")
• 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)
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
SURFA: Wind and Temperature Comparisons: Oct 2008
ECMWF – green; DWD – blue; Buoy – red dots.
10m wind speed
Zonal wind
Meridional wind
SST
Air temperature
ECMWF – green; magenta + warm layerDWD – blue; Buoy – red dots.
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
Intensive work to improve measurements
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.QuickTime™ and a
TIFF (Uncompressed) decompressorare needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
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
Priority to extend observations to high latitudes
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
QuickTime™ and aTIFF (Uncompressed) decompressor
are needed to see this picture.
Hi-lat Issues:Severe motion correctionsContamination by saltFlow distortionSurface boundary conditions Extreme cold, icing, frost formation, fog/rain impactPoor signal to noise, weak stratified turbulenceA lack of field programs focused on parameterization
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