OASIS-CANADA-OOTI ASCOS: Atmospheric composition measured from the Oden Ice Breaker

Data were compiled in campaign mode and were obtained over the ice of the central Arctic Ocean north of Svalbard, using the OOTI (Out On The Ice) light mobile laboratory powered by a bank of 12 VDC batteries. Chemical variables were collected with instrumentation 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): Data were collected by a hybrid MAXDOAS (multi-axis differential optical absorption spectrometer) which was built by the University of Heidelberg and Hoffmann Messtechnik GmbH with an integrated scan head designed by the University of Alaska Fairbanks. Bromine monoxide and oxygen dimer data were taken at variable temporal resolution depending on ambient light intensity and are all included in one file for the entire campaign. Surface Ozone (O3): 5 minutes averages are taken with 2B technology ozone monitor and all data have been archived in one combined data file. A record of GPS location of the measurements at one minute resolution is archived in one data file. Existing gaps in the data are due to poor ice conditions not permitting deployment over the ice, instrumentation maintenance or power interruption. This study was part of the FPO OASIS-CANADA program and ASCOS, Arctic Summer Cloud Ocean Study.