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Arctic Sea Ice News Fall 2007

From the National Snow and Ice Data Center
Overview of current sea ice conditions
Sea ice extent continues to decline, and is now at 4.24 million square kilometers (1.63 million square miles), falling yet further below the previous record absolute minimum of 5.32 million square kilometers (2.05 million square miles) that occurred on September 20–21, 2005.

Current Sea Ice Conditions: September 9, 2007

The image at left provides the updated map of sea ice extent for September 9, 2007. Sea ice extent now stands at 4.24 million square kilometers (1.63 million square miles). The magenta line shows the median September monthly extent based on data from 1979 to 2000.

The Northwest Passage is still open. The Northeast Passage, along the coast of Siberia, is still closed by a narrow band of sea ice.

Please note that our daily sea ice images, derived from microwave measurements, may
show spurious pixels in areas where sea ice may not be present. These artifacts are
generally caused by coastline effects, or less commonly by severe weather. Scientists
use masks to minimize the number of "noise" pixels, based on long-term extent patterns.
Noise is largely eliminated in the process of generating monthly averages, our standard
measurement for analyzing interannual trends. Data derived from Sea Ice Index data set.
Credit: National Snow and Ice Data Center.
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