Pictures of ice floes tilted by the ship's hull for the illustration of the ship-based snow depth on sea ice estimation from, e.g., aboard the research icebreaker Polarstern.
This data set is a collection of visual ship-based sea-ice observations carried out from the ship's bridge while the ship cruises through the sea ice. These observations have been standardized according to the ASPeCt protocol. These observations contain the ship's position, the day and time of the observation (hourly, with an observation radius around the ship of about 1 km), the total sea ice concentration, the partial concentrations of the three thickest sea ice types, and for these, respectively, thickness, type, degree of deformation, floe size, and snow properties and depth.
For more information see: http://www.aspect.aq
A tutorial allows to learn how sea-ice observations are carried out according to the ASPeCt protocol.
The two pictures at the top illustrate how the snow depth on sea ice is estimated by looking at the tilted ice floe and a scale attached to the ship's hull (in this case the research icebreaker Polarstern).
Coverage, spatial and temporal resolution
Period and temporal resolution:
Coverage and spatial resolution:
The header of the data files informs about the parameters included and in which column they are given in the data file. Data of different cruises are given in chronological order; the beginning of a new (cruise) data set is indicated at the first line of the respective data set (see references).
This data indicate the mean, typical sea ice thickness along the ship's cruise track; this data can not be recommended for a point validation.
This data is based on a visual estimation of the mentioned parameters and/or the parameters given in the data file and the tutorial.
The accuracy is therefore quite low: sea ice concentrations are given in 10% intervals; the snow depth given in 10 cm intervals - unless the ice is thin.
Name: Stefan Kern
Institute: CliSAP / KlimaCampus / ICDC
email: stefan.kern@ zmaw.de
Name: Anthony Worby
Institute: Australian Antarctic Division and ACE CRC, University of Tasmania
email: A.Worby@ utas.edu.au
Should this data be used in a publication / report / presentation it is asked to cite as follows:
The ship-based sea ice and snow thickness data were provided by the SCAR Antarctic Sea Ice Processes and Climate (ASPeCt) program (www.aspect.aq)