Mark A. Miller, Department of Environmental Sciences, Rutgers, The State University of New Jersey. Peter J. Lamb, Cooperative Institute for Mesoscale Meteorological Studies and School of Meteorology, The University of Oklahoma.
The RADAGAST experiment was led by Tony Slingo and took place in Niamey, Niger, during all of 2006. It examined the Radiative Atmospheric Divergence using Atmospheric Radiation Measurement (ARM) Mobile Facility, Geostationary Earth Radiation Budget (GERB) data, and African Monsoon Multidisciplinary Analysis (AMMA) stations, hence its striking acronym. RADAGAST capitalized on the close geographical proximity of (1) the surface and remotely-sensed measurements made by the ARM Mobile Facility at Niamey (13º 29'N. 2º 10'E) and (2) the GERB broadband radiometer and multichannel Spinning Enhanced Visible and Infrared Imagery (SERVI) measurements made on the Meteostat-8 operational geostationary satellite stationed above 0º longitude. This unique combination of an extended series of broadband measurements both at the surface and from space, backed up by a wide range of observations from passive and active instrumentation, provided a near-continuous record that sampled the entire range of conditions through both the Sahelian dry and wet seasons in 2006. Under the further leadership of Tony Slingo, the principal RADAGAST results were represented in a series of eight papers published in the Journal of Geophysical Research-Atmospheres in 2008-2009. Our Slingo Symposium presentation will summarize the most important results obtained, emphasizing the annual cycle of the radiative flux divergence across the atmospheric column and its meteorological and environmental controls.