ausblenden:
Schlagwörter:
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Zusammenfassung:
Antarctic sea ice is a complex essential climate variable, primarily measured by satellite measurements that begin in 1979. The relatively short satellite record details significant time-varying trends, with increases in total Antarctic sea ice extent through 2016, in stark contrast to the Arctic. Recently, both 2022 and 2023 were consecutively marked with record lows in total Antarctic sea ice extent. To place these trends in a longer historical perspective, several reconstructions of Antarctic sea ice extent have been completed. One approach uses ice core information to reconstruct regional (or, when used in a climate model, total) historical variations of Antarctic sea ice extent or ice edge. Another recent approach uses statistical relationships with climate across the Southern Hemisphere to reconstruction seasonally- and sectorally-resolved Antarctic sea ice extent.
While these two approaches provide a much longer historical context, there are notable differences between the various reconstructions, and unfortunately their interannual correlations are very low. In this vein, this presentation will 1) place the recent record conditions in a century-scale historical perspective given by reconstructions; 2) pinpoint the differences in the various reconstructions, and provide some explanation as to why these differences exist; and 3) examine the possibility of sea ice concentration reconstructions to further understand the seasonal spatiotemporal variations in Antarctic sea ice over the last century. The ultimate goal is to provide researchers the knowledge they need when utilizing these reconstructions so that they can be used and interpreted appropriately.
