ASPeCt bridge-based sea-ice observations - 2007 to 2013

The Antarctic Sea ice Processes and Climate [ASPeCt] data sets submitted here have been collected systematically from the bridge of an icebreaker, while it transited through the pack ice. Quantifiable observations of sea ice thickness and related characteristics of the sea ice, snow, ocean and surface atmosphere are recorded hourly while the vessel moves through the sea ice. If the vessel is stopped or has not moved at least 6nm since the previous observation, no observation will be conducted. The observation protocol has been endorsed by the Scientific Commission for Antarctic Research (under their ASPeCt programme) as the preferred method for conducting ship-based observations of sea-ice characteristics. Details can be found in Worby and Allison [1999]The spreadsheet information below is also included in the word document in the download file.The relevant spreadsheets (xls files) contain the following information: Header name    Physical parameter    UnitYear    Year    Date    Day/Month/Year    Julian Day    Day of year    Time (UT)    Time of day in Universal time: Hours/Minutes/Seconds    Lat (oN)    Latitude    oNLon(oE)        oEConc    Total ice concentration    TenthOW    Open-water classification    See Worby and Allison [1999]c1    Ice concentration of primary ice category    Tenthty1    Ice type of primary ice category    See Worby and Allison [1999]iz1    Thickness of primary ice category    cmf1    Floe size of primary ice category    See Worby and Allison [1999]t1    Topography of primary ice category    See Worby and Allison [1999]s1    Snow type on primary ice category    See Worby and Allison [1999]sz1    Snow thickness on primary ice category    cmc2    Ice concentration of secondary ice category    Tenthty2    Ice type of secondary ice category    See Worby and Allison [1999]iz2    Thickness of secondary ice category    cmf2    Floe size of secondary ice category    See Worby and Allison [1999]t2    Topography of secondary ice category    See Worby and Allison [1999]s2    Snow type on secondary ice category    See Worby and Allison [1999]sz2    Snow thickness on secondary ice category    cmc3    Ice concentration of tertiary ice category    Tenthty3    Ice type of tertiary ice category    See Worby and Allison [1999]iz3    Thickness of tertiary ice category    cmf3    Floe size of tertiary ice category    See Worby and Allison [1999]t3    Topography of tertiary ice category    See Worby and Allison [1999]s3    Snow type on tertiary ice category    See Worby and Allison [1999]sz3    Snow thickness on tertiary ice category    cmSea    Sea-surface temperature    oCAir    Surface-air temperature    oC