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

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QuickTime™ and aTIFF (Uncompressed) decompressor

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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