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RADIATIVE TRANSFER IN SHALLOW CUMULUS CLOUD FIELDS

This study presents the major objectives and findings from the BBC Field Campaign conducted in 2003, which focused on collecting detailed observations of radiative fluxes within shallow cumulus cloud fields. Key parameters such as upwelling and downwelling radiation, actinic flux, and global irradiance were measured as functions of azimuth and zenith angles under both cloudy and clear sky conditions. The data collected are crucial for understanding cloud effects on radiation and improving climate models.

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RADIATIVE TRANSFER IN SHALLOW CUMULUS CLOUD FIELDS

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  1. RADIATIVE TRANSFER IN SHALLOW CUMULUS CLOUD FIELDS HAN VAN DOP and KEITH WILSON BBC FIELD CAMPAIGN 2003 October 2004

  2. MAJOR OBJECTIVES collection of observations of radiative fluxes as a function of azimuth and zenith angle (radiances) in cloudy conditions

  3. OBSERVED PARAMETERS Radiance, R() Upwelling Radiation (integrated /2-, 0-2D Downwelling Radiation (integrated 0-/2, 0-2D Azimuthal irradiance (IA( Actinic Flux (integrated 0-, 0-2F Global Irradiance, G Liquid water content, LWC

  4. TEST CASES • cloudless conditions • cloudy conditions

  5. FLIGHT GEOMETRIES

  6. Clear sky data, 8, 10, 21 May

  7. 10 May UVa blue sky Azimuthally Integrated radiance Flight track 324 s G D D LWC Flight altitude R(

  8. 8 May visible blue sky

  9. 8.47 8.63 8.41 Down-welling radiance, D Blue sky 8.73 8.80 8.98

  10. G 10 May 21May cud D cd D cs LWC ic Clear sky (cs) Cloud up (cu) Cloud dwn (cd) Cloud up&dwn (cud) In Cloud (ic) 21May 21May cd cs cu

  11. 10 May Cloud passings 108 s

  12. In-cloud descent

  13. upper cloud part 2577m lower cloud part 2486m

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