OASIS-CANADA-OOTI COBRA: Atmospheric composition and structure during the COBRA campaign near Kuujjuarapik/Whapmagoostui, Québec

Data were compiled in campaign mode and obtained over the ice of the frozen Hudson Bay near Kuujjuarapik/Whapmagoostui, Québec 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 state of the art instrumentation, as detailed below. Position: records of location were taken on each new site by hand-held Garmin GPS receiver and included in each data file. Bromine monoxide (BrO): Measurements were taken by an hybrid MAXDOAS (multi-axis differential optical absorption) instrument built by the University of Heidelberg, Hoffmann Messtechnik GmbH with an integrated scanning head built by University of Alaska Fairbanks. Bromine monoxide and oxygen dimer data were taken at variable temporal resolution depending on light intensity are included in one file for the entire campaign with corresponding GPS locations. Ozone (O3): one-minute averages are taken with 2B Technology ozone monitors at 2 heights and merged with meteorological variables and GPS location in combined daily data files. Wind, temperature, pressure, relative humidity, and radiation meteorological variables: Campbell Scientific data logger and instrumentation were used to collect data which were archived at one-minute intervals. Environmental survey (photos): Logitech webcam taking snap shots at five-minute intervals are archived. Existing gaps in the data are due to instrumentation maintenance or power interruption.