ASCOS-60GHzScanRadar-01

ASCOS was an interdisciplinary expedition to the central Arctic on the icebreaker Oden from 1 August to 9 September 2008. The expedition focused on processes relating to cloud formation in the summer Arctic and included observations of marine biology and chemistry, atmospheric chemistry, physical oceanography, aerosol chemistry and physics, and meteorology.File ASCOS_60GHz_data_6h_v1a contains the 60 GHz scanning radiometer temperature profiles, from 30 m to 1 km and with 5-minute resolution from Aug. 1 to Sep. 16 during ASCOS. It replaces ASCOS_60GHz_data_6h_v1 because of some minor timing and low-level errors found in latter. Only the scans from the right-hand-side of the ship are used (over the ice); those from the left-hand-side (over the bow) are not used. The retrieval technique follows Trokhimovski et al 1998 (IEEE Trans) and others and uses a linear interpolation of the 6-hourly soundings as a first guess. In the linear retrieval, a value of gamma=.05
is used. This is a compromise value to allow deviations from the first guess but to minimize the amount of spurious superadiabatic lapse rates obtained at low levels. Validations against independent sondes show root-mean-square-errors typically less than 1.0 K. Future versions of this data set will try to allow greater deviations by applying additional numerical constraints on the retrieval. Additional information can be found in the tables in the readme file.