The amount of floating sea ice encircling Antarctica reached the lowest level ever recorded, a sign that one of the most remote and mysterious facets of the climate system may, at last, be responding to the overall planetary warming trend.
Scambos and other scientists determine sea ice extent at both poles from satellite data, and their figures count all areas where there is at least a 15 percent concentration of floating sea ice. Because individual daily readings can jump up and down, researchers use a five day average of the satellite data to assess whether a record has been broken.
In the Arctic, the downtrend in the extent of floating sea ice has been clear and pronounced since the late 1970s. Based on annual averages of the ice’s extent, theno clear downtrend in overall sea ice extent has yet emerged. It has even appeared as if ice extent might be rising slightly — despite general expectations that a warmer Earth should feature less ice at both poles.
Scientists say that these vast seasonal swings have made it tough to detect trends in the Antarctic. But with two record lows for Antarctic ice in 2022 and 2023 — and before that a record low in 2017 — it could be that a signal is beginning to emerge, at least in the summer. Scientists with the National Snow and Ice Data Center, which provides the data, also sounded a cautionary note in their announcement.
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