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The Arctic Gateway

With Walt Meier, Senior Research Scientist/DAAC Scientist, NSIDC

When: 19th January 2022, 11:00AM - 12:00PM MST

Passive microwave sensors provide a long, consistent, and nearly-complete record of sea ice concentration since 1979. This represents one of the longest satellite-derived climate records. The records indicate a substantial decline in Arctic sea ice cover over the past 40+ years while the Antarctic displays large inter-annual variability with only small trends. Several algorithms have been developed to determine concentration from passive microwave sensors. Here, three products archived at NSIDC are inter-compared to assess the long-term trends in sea ice extent and area from the three products. Both hemispheric and regional analyses are done, based on a newly-developed region mask. The hemispheric trends are generally consistent, but differences between the products do have impacts on interpretation of the small trends in the Antarctic. Regional trends largely follow the hemispheric trends, but some regions have unique features.

 

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