북극 온난화에 따른 겨울철 대기 변동성 분석 연구
Analysis on Winter Atmosphereic Variability Related to Arctic Warming
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초록
The “Barents Oscillation (BO)”, first designated by Paul Skeie (2000), is an anomalousrecurring atmospheric circulation pattern of high relevance for the climate of the NordicSeas and Siberia, which is defined as the second Emperical Orthogonal Function (EOF) ofmonthly winter sea level pressure (SLP) anomalies, where the leading EOF is the Arctic Oscillation(AO). BO, however, did not attracted much interest. In recent two decades, variability ofBO tends to increase. In this study, we analyzed the spatio-temporal structures of Atmosphericinternal modes such as Arctic Oscillation (AO) and Barents Oscillation (BO) and examinedhow these are related with Arctic warming in recent decade. We identified various aspects ofBO, not dealt in Skeie (2000), such as upper-level circulation and surface characteristics forextended period including recent decade and examined link with other surface variables suchas sea-ice and sea surface temperature. From the results, it was shown that the BO showedmore regionally confined spatial pattern compared to AO and has intensified during recentdecade. The regional dipolelar structure centered at Barents sea and Siberia was revealed inboth sea-level pressure and 500 hPa geopotential height. Also, BO showed a stronger link (correlation)with sea-ice and sea surface temperature especially over Barents-Kara seas suggestingit is playing an important role for recent Arctic amplification. BO also showed highcorrelation with Ural Blocking Index (UBI), which measures seasonal activity of Ural blocking. Since Ural blocking is known as a major component of Eurasian winter monsoon and canbe linked to extreme weathers, we suggest deeper understanding of BO can provide a missinglink between recent Arctic amplification and increase in extreme weathers in midlatitude inrecent decades.
Abstract
The “Barents Oscillation (BO)”, first designated by Paul Skeie (2000), is an anomalousrecurring atmospheric circulation pattern of high relevance for the climate of the NordicSeas and Siberia, which is defined as the second Emperical Orthogonal Function (EOF) ofmonthly winter sea level pressure (SLP) anomalies, where the leading EOF is the Arctic Oscillation(AO). BO, however, did not attracted much interest. In recent two decades, variability ofBO tends to increase. In this study, we analyzed the spatio-temporal structures of Atmosphericinternal modes such as Arctic Oscillation (AO) and Barents Oscillation (BO) and examinedhow these are related with Arctic warming in recent decade. We identified various aspects ofBO, not dealt in Skeie (2000), such as upper-level circulation and surface characteristics forextended period including recent decade and examined link with other surface variables suchas sea-ice and sea surface temperature. From the results, it was shown that the BO showedmore regionally confined spatial pattern compared to AO and has intensified during recentdecade. The regional dipolelar structure centered at Barents sea and Siberia was revealed inboth sea-level pressure and 500 hPa geopotential height. Also, BO showed a stronger link (correlation)with sea-ice and sea surface temperature especially over Barents-Kara seas suggestingit is playing an important role for recent Arctic amplification. BO also showed highcorrelation with Ural Blocking Index (UBI), which measures seasonal activity of Ural blocking. Since Ural blocking is known as a major component of Eurasian winter monsoon and canbe linked to extreme weathers, we suggest deeper understanding of BO can provide a missinglink between recent Arctic amplification and increase in extreme weathers in midlatitude inrecent decades.
참고문헌 (47)
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