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- W4386619118 abstract "Over recent decades, the Southern Ocean (SO) has experienced multi-decadal surface cooling despite global warming. Earlier studies have proposed that recent SO cooling has been caused by the strengthening of surface westerlies associated with a positive trend of the Southern Annular Mode (SAM) forced by ozone depletion. Here we revisit this hypothesis by examining the relationships between the SAM, zonal winds and SO sea-surface temperature (SST). Using a low-frequency component analysis, we show that while positive SAM anomalies can induce SST cooling as previously found, this seasonal-to-interannual modulation makes only a small contribution to the observed long-term SO cooling. Global climate models well capture the observed interannual SAM-SST relationship, and yet generally fail to simulate the observed multi-decadal SO cooling. The forced SAM trend in recent decades is thus unlikely the main cause of the observed SO cooling, pointing to a limited role of the Antarctic ozone hole." @default.
- W4386619118 created "2023-09-12" @default.
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- W4386619118 date "2023-09-11" @default.
- W4386619118 modified "2023-09-26" @default.
- W4386619118 title "Recent multi-decadal Southern Ocean surface cooling unlikely caused by Southern Annular Mode trends" @default.
- W4386619118 doi "https://doi.org/10.22541/essoar.169447433.33762344/v1" @default.
- W4386619118 hasPublicationYear "2023" @default.
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