Data were compiled in campaign mode and were obtained over the ice of the Amundsen Gulf, using the OOTI (Out On The Ice) mobile laboratory mounted on a specially manufactured Arctic sled and running on a bank of 12 VDC batteries. Chemical and meteorological variables were collected with commercial instrumentation, as detailed below. Mercury (Hg): Gardis (atomic absorption spectroscopy) instrumentation displayed strong dependence of the cell desorption with battery voltage, thus data are not archived. Bromine monoxide (BrO): Measurements were made with a hybrid MAXDOAS (multi-axis differential optical absorption) instrument built by the University of Heidelberg and Hoffmann Messtechnik GmbH, and integrated scan head built by University of Alaska Fairbanks. Bromine monoxide and oxygen dimer data were taken at variable temporal resolution based on available light intensity and are all included in one file for the entire campaign. Ozone (O3): One-minute averages are taken with two 2B technology monitors at two different heights and archived data are merged with meteorological variables in daily combined data files. Atmospheric turbulence was characterised by Sonic anemometer; Data were recorded at 10Hz, 1 Hz, 1 minute sampling frequency and archived at one-minute resolution. Wind, temperature, atmospheric pressure, relative humidity, and radiation: Campbell Scientific instrumentation data are archived at one-minute intervals. Position: GPS was recorded at 10Hz resolution by NovaTel GPS receiver built into the OOTI system. One-minute frequency record is included with combined ozone and meteorological data daily files. Environmental survey (photos): Logitech webcam taking snap shots at five-minute intervals are archived. Carbon dioxide measurements made with Licor instrument indicated strong dependence on temperature and input voltage thus are not archived.
