Retrieval of Arctic Sea Ice Parameters by Satellite Passive Microwave Sensors: A Comparison of Different Sea Ice Algorithms

Speaker: 
Natalia Ivanova
Seminar Date: 
17. January 2013 - 12:30 - 13:15
Location: 
Lecture room, Ground Floor, NERSC

Eleven different passive microwave sea ice algorithms were implemented and inter-compared. The algorithms computing the sea ice concentration are using the same input of SMMR (1978-1987) and SSM/I (1987- ) daily brightness temperatures for the period 1979 – 2010 for low-frequency algorithms and 1992 – 2010 for high-frequency algorithms. Daily, monthly and yearly Arctic sea ice concentration, area and extent were calculated by the algorithms. The differences between the eleven sea ice concentration estimates sometimes called structural uncertainties were analyzed spatially and seasonally. Linear trends were calculated and compared for sea ice concentration, area and extent in order to estimate the Arctic sea ice parameters change during the 32 and 19 years periods including the seasonal change in trends. The algorithms ensemble and in particular the sea ice concentration standard deviation describing part of the uncertainty is suggested in order to provide uncertainties to the users of sea ice concentration data.