Influence of winter and summer surface wind anomalies on Summer Arctic sea ice extent
Based on a statistical analysis incorporating 925-hPa wind fields from the NCEP/NCAR Reanalyses, it is shown that the combined effect of winter and summer wind forcing accounts for 50 % of the variance of the change in September Arctic sea ice extent from one year to the next ( Δ SIE) and it also ex...
| Main Authors: | , , |
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| Format: | Text |
| Language: | English |
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| Online Access: | http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.167.1378 http://www.jamstec.go.jp/frsgc/research/d2/masayo.ogi/2009GL042356-pip.pdf |
| Summary: | Based on a statistical analysis incorporating 925-hPa wind fields from the NCEP/NCAR Reanalyses, it is shown that the combined effect of winter and summer wind forcing accounts for 50 % of the variance of the change in September Arctic sea ice extent from one year to the next ( Δ SIE) and it also explains roughly 1/3 of the downward linear trend of SIE over the past 31 years. In both seasons meridional wind anomalies to the north and east of Greenland are correlated with September SIE, presumably because they modulate the export of ice through Fram Strait. Anticyclonic wind anomalies over the Beaufort Sea during summer favor low September SIE and have contributed to the record-low values in recent summers, perhaps by enhancing the The dramatic retreat of Arctic sea ice extent (SIE) during recent decades, especially during summer [Serreze et al., 2007; Comiso et al., 2008] has been attributed to changing patterns of surface winds [Rigor et al., 2002; Rigor and Wallace 2004], ocean currents [Polyakov et al., 2005; Shimada et al., 2006], and downward energy |
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