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The extent of perennial sea ice in the East Arctic Ocean (0–180°E) decreased by nearly one half with an abrupt reduction of 0.95 × 10 6 km 2 , while the West Arctic Ocean (0–180°W) had a slight gain of 0.23 × 10 6 km 2 between 2004 and 2005, as observed by satellite scatterometer data during November–December. The net decrease in the total perennial ice extent is 0.72 × 10 6 km 2 , about the size of Texas. Perennial ice in the East Arctic Ocean continued to be depleted with an areal reduction of 70% from October 2005 to April 2006. With the East Arctic Ocean dominated by seasonal sea ice, a strong summer melt may open a vast ice‐free region with a possible record minimum ice extent largely confined to the West Arctic Ocean. Simultaneous scatterometer measurements of sea ice and winds will be crucial for sea ice monitoring and forecasts.
Nghiem et al. (Fri,) studied this question.
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