ARSF project NL08/01: EUCAARI-Cloud Radiation Interaction Study (EU-CRIS). Led by: Prof. Hugh Coe, University of Manchester, SEAES, Simon Building, Oxford Road, Manchester, M13 9PL, UK. Location: Cabauw, The Netherlands.

Clouds are highly reflective and scatter incoming solar radiation to space, thereby increasing the planetary reflectance, or albedo. The Intergovernmental Panel on Climate Change Fourth Assessment Report (2007) has identified the perturbation of aerosol and cloud bymans activities as the most uncertain part of mans contribution to changes in the Earths radiation balance. EUCAARI is an EU 6th Framework Integrated Programme on Aerosol Cloud Climate and Air Quality Interactions. A major activity in EUCAARI is a multi-aircraft experiment to investigate aerosol properties and processes across Europe and to study the interaction between aerosols and clouds. This latter activity was conducted by the French SAFIRE ATR-42 aircraft, which flew in the region of Cabauw, Netherlands, a major ground station equipped with radiometers and lidar. The current activities were focussed on aerosol-cloud interactions making use of in-situ measurements but including a cloud RADAR and an aerosol lidar. This proposal sought to extend the measurement capability by making a suite of remote radiometric measurements of the short wave and near infra-red reflected radiation from above the cloud. These measurements will be both compared with in situ measurements and also, where possible, with satellite information.