Arctic Multiyear Ice Concentration Retrieval from SSM/I Data Using the NASA Team Algorithm with Dynamic Tie Points - Towards an Interdisciplinary Approach in Earth System Science - page 97

Fig. 3 Total sea ice extent retrieved with NASA Team algorithm, multiyear ice extent retrieved
with NASA Team algorithm and dynamic NASA Team algorithm from 1989 to 2012. SI-NT: total
sea ice extent retrieval with NASA Team algorithm, MYI-NT: multiyear ice extent retrieved with
NASA Team algorithm, MYI-NTD: multiyear ice extent retrieval with dynamic NASA Team
algorithm

Fig. 4 Arctic sea ice out fl ow through Fram Strait (October May) (Kwok 2009 ) and multiyear ice

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reduction (November April) from 1988 to 2007

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4 Sensitivity Study and Conclusion

A sensitivity study was conducted to see the in uence of each tie point on the

multiyear ice concentration retrieval. The standard deviation T B ; std and average
difference T B ; diff are introduced to measure the stability of the dynamic tie points
and the difference from fixed tie points. T B ; diff is calculated as:

fl