COBRA (impact of COmbined iodine and Bromine Release on the Arctic atmosphere) is a UK IPY (International Polar Year) consortium that aims to investigate the release mechanisms of iodine in the Arctic and the potential combined effects of iodine and bromine on its atmosphere. The team measured reactive inorganic halogens (BrO, IO, OIO, I2), O3, Hg, HOx, HCHO, NOx, VOCs and reactive halocarbons from temporary laboratories located on the eastern shore of Hudson Bay, north of Kuujjuarapik, during February-March 2008. Met balloons and O3 sondes were launched daily. COBRA set up an ice camp and flux chamber experiments ~500 m into the bay to directly measure halogen emissions and ozone deposition, and measured physical, chemical and biological characteristics of the sea-ice (and potentially of frost flowers) at different depths. The project is linked with OOTI, which carried out a simultaneous field experiment at Kuujjuarapik. The dataset measurements come from the British Antartic Survey (BAS) Frost Flower Specific Surface Area (SSA) using a Brunauer-Emmett-Teller (BET) surface area measurement apparatus.

Data were collected on the 27th of November 2008 and on 5th of January 2009 by the University of Manchester multi-angle absorption photometer at Chilbolton site in support of the FAAM campaign in the South-West of the UK. The dataset contains measurements of concentrations of black carbon mass loadings based on aerosol optical absorption. The data were collected for use in the CLOUDS project, which is one of multiple projects within the APPRAISE (Aerosol Properties, PRocesses And Influences on the Earth's climate) programme.