Influence of the Meridional Shifts of the Kuroshio and the Oyashio Extensions on the Atmospheric Circulation

被引:210
作者
Frankignoul, Claude [1 ]
Sennechael, Nathalie [1 ]
Kwon, Young-Oh [2 ]
Alexander, Michael A. [3 ]
机构
[1] Univ Paris 06, LOCEAN IPSL, F-75252 Paris 05, France
[2] Woods Hole Oceanog Inst, Woods Hole, MA 02543 USA
[3] NOAA, ESRL, Boulder, CO USA
基金
美国国家科学基金会;
关键词
NORTH-ATLANTIC SST; DECADAL CLIMATE VARIABILITY; AIR-SEA INTERACTION; GULF-STREAM; EL-NINO; PACIFIC; OCEAN; ANOMALIES; FEEDBACK; SCALE;
D O I
10.1175/2010JCLI3731.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The meridional shifts of the Oyashio Extension (OE) and of the Kuroshio Extension (KE), as derived from high-resolution monthly sea surface temperature (SST) anomalies in 1982-2008 and historical temperature profiles in 1979-2007, respectively, are shown based on lagged regression analysis to significantly influence the large-scale atmospheric circulation. The signals are independent from the ENSO teleconnections, which were removed by seasonally varying, asymmetric regression onto the first three principal components of the tropical Pacific SST anomalies. The response to the meridional shifts of the OE front is equivalent barotropic and broadly resembles the North Pacific Oscillation/western Pacific pattern in a positive phase for a northward frontal displacement. The response may reach 35 m at 250 hPa for a typical OE shift, a strong sensitivity since the associated SST anomaly is 0.5 K. However, the amplitude, but not the pattern or statistical significance, strongly depends on the lag and an assumed 2-month atmospheric response time. The response is stronger during fall and winter and when the front is displaced southward. The response to the northward KE shifts primarily consists of a high centered in the northwestern North Pacific and hemispheric teleconnections. The response is also equivalent barotropic, except near Kamchatka, where it tilts slightly westward with height. The typical amplitude is half as large as that associated with OE shifts.
引用
收藏
页码:762 / 777
页数:16
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