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Terms of |
Richard Hall provides the graph above with the following comments:
These results are in the process of being published (soon I hope). We want to share the results with the ice charting community first partly for feedback, and partly as an advertisement (for funding and access to ships-of-opportunity).
The graph shows sea ice concentrations derived from SSM/I (red) and IceCam data (green) along the cruise track of RV Jan Mayen in the Greenland Sea on 26th February 2000.
Web site: http://www.spri.cam.ac.uk/people/neh25/IceCam.html
The resolutions of the two systems are very different. This explains why the SSM/I line is smooth, while the IceCam line is highly variable. The averaged IceCam data (blue) removes the extreme values and has a trend very similar to the SSM/I data.
There are three main reasons why the SSM/I data and the averaged IceCam data do not exactly match.
Firstly, the ships course was the easiest course available, i.e where ice concentration was lowest. So on either side of the ship the ice concentration could be as high as 100% but the forward view could be as little as 0%. Secondly, SSM/I decreases in accuracy below 15%. Finally, the satellite data are collected instantaneously while the IceCam data is collected throughout the day (daylight hours) so there can be a temporal error as well.
Your comments would be much appreciated.
Richard J. Hall
Sea Ice & Polar Oceanography
Scott Polar Reseach Institute
Cambridge
CB2 1ER
United Kingdom
e-mail: rjh55@cam.ac.uk
