Asked by Anna
what is the effect of changing temperature on the artic ocean as observed by scientists over the last few decades? there are more areas of open ocean, there are no changes in temperature, there is less saltwater, there is more sea ice
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The correct effects are: there are more areas of open ocean (and correspondingly less sea ice).
Why: Arctic air and ocean temperatures have warmed over the past few decades, causing summer sea-ice extent and thickness (especially multiyear ice) to decline — satellite records show large drops in September minimum ice extent (roughly ~10–15% per decade since 1979). That produces more open water, a longer melt season and related feedbacks (lower albedo, ecosystem and shipping impacts). "No changes in temperature" is false; "less saltwater" is an oversimplification (some surface freshening is observed in places, but the primary, observed large-scale change is loss of sea ice/increased open water).
Why: Arctic air and ocean temperatures have warmed over the past few decades, causing summer sea-ice extent and thickness (especially multiyear ice) to decline — satellite records show large drops in September minimum ice extent (roughly ~10–15% per decade since 1979). That produces more open water, a longer melt season and related feedbacks (lower albedo, ecosystem and shipping impacts). "No changes in temperature" is false; "less saltwater" is an oversimplification (some surface freshening is observed in places, but the primary, observed large-scale change is loss of sea ice/increased open water).
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