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Data were acquired from scientist and icebreaker logbooks and contractor records (DACSUSAP2012-13, pers. comm. P. McGillivary USCG, see link below). \u00a0\u00a0See\u00a0deployment:\u00a0McMurdo_IceBreakers_1957-2015\u00a0for a list of icebreakers used.
\nExternal link to more information about\u00a0ice-breaking services at McMurdo Station, Antarctica:
\n* DACSUSAP2012-13 Ice-breaking Services
This dataset contains dates of icebreaker start and arrival at McMurdo Station in McMurdo Sound, Antarctica between austral years 1956/1957 and 2014/2015. \u00a0It also includes the distance\u00a0between the fast ice edge and McMurdo Station on the date of ship arrival at the fast ice edge.
Note: The arrival day \"12\" for the icebreaker Vladimir ignatyuk\u00a0for the 2013 season is uncertain.
\nBlanks indicate no data were collected.
\nBCO-DMO Data Manager Processing Notes:
\n* added a conventional header with dataset name, PI name, version date
\n* modified parameter names to conform with BCO-DMO naming conventions
\n* blank values replaced with no data value 'nd'
\n* added data column \"austral_year\" for clarification when start year is before the austral year.
\n* added approximate latitude and longitude of sampling location near McMurdo Station.