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Comparing Observations and Calculations of Radiation During the RADAGAST Experiment

Nazim Bharmal ESSC, University of Reading
Anthony Slingo University of Reading
Jeffery Settle University of Reading
Gary Robinson Environmental Systems Science Centre
Helen White Environmental Systems Science Centre, University of Reading

Category: Modeling

The Radiative Divergence using ARM Mobile Facility (AMF), Geostationary Earth Radiation Budget (GERB), and African Monsoon Mutidisciplinary Analysis (AMMA) Stations (RADAGAST) experiment offers a joint surface-top-of-the-atmosphere (TOA) dataset of high-time resolution radiative flux (surface) and radiance (TOA) measurements. These measurements are from the ARM Climate Facility (ACRF) AMF deployment to Niamey, Niger, in 2006 (surface) and the GERB instrument (TOA) aboard Meteosat-8. The resulting surface-TOA flux estimates are compared with model calculations, the latter includes moderate-resolution imaging spectroradiometer (MODIS) estimates of surface heterogeneity over the spatial cover of the satellite footprint. The model results are, therefore, a best estimate that avoid systematic biases at the surface. The efficacy of the GERB radiance-to-flux conversion was also studied to understand errors at the TOA. Results are shown from both shortwave (SW) and longwave (LW) wavebands, and the consequences for atmospheric divergence calculations are discussed.

http://radagast.nerc-essc.ac.uk/

This poster will be displayed at ARM Science Team Meeting.

POSTER in PDF: for proper viewing, it should be viewed with Adobe Acrobat Reader. Download the latest version from the Adobe Reader website.