Spatial variation of the Arctic Oscillation and its long-term change
Spatial variation of the Arctic Oscillation and its long-term change
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北极涛动的空间变化及其长期变化
DOI：
10.1111/j.1600-0870.2010.00472.x
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发表时间：
2010-01
影响因子：
2
通讯作者：
Cao Yong
中科院分区：
文献类型：
--
作者：
Zhao Jinping;Shi Jiuxin;Cao Yong
摘要 北极涛动（AO）存在空间差异，但缺乏研究。作者将AO的空间变化定义为海平面压力（SLP）在一定时间跨度内与AO指数一致变化的网格集合的时间变化。该系综的区域被称为“AO主导区域”，通过网格SLP与AO指数的运行相关系数来识别。正、负AO主导区表明海平面气压有时在极地和中纬度地区之间振荡，有时在陆地和海洋之间振荡。沿着大西洋—太平洋剖面，北大西洋涛动以稳定的跷跷板偶极子形式存在，而在太平洋一侧，涛动是间歇性的，强度较低，边界摆动。 AO 的三个阶段的长期空间变化可以通过 SLP 异常区域的相对面积清楚地识别。 1970年以前，海压正异常区占主导地位，显示了全球变暖之前的状态。 1971-1995年间，负海平面气压异常区域占主导地位，表明全球变暖的影响在北极变暖之前就已显现。 1996年以来，正、负海平面气压异常区域均较小，可能是北极变暖期间海冰退缩造成的。
Abstract The Arctic Oscillation (AO) is spatially varied, but lack of study. The authors defined the spatial variation of AO as the temporal variation of the ensemble of grids with sea level pressure (SLP) varying consistent with the AO index in certain time span. The region of the ensemble is called as ‘AO-dominant region’, identified by the running correlation coefficient of gridded SLP with the AO index. The positive and negative AO-dominant regions show that the SLP oscillated sometimes between the polar and mid-latitude regions and sometimes between land and ocean. Along the Atlantic—Pacific section, the North Atlantic Oscillation exists as a stationary seesaw-like dipole, while on the Pacific side the oscillation is intermittent with lower intensity and swinging boundary. The long-term spatial variation of the AO with three stages is clearly identified by the relative area of the SLP anomaly regions. Positive SLP anomaly area dominated before 1970, showing the state before the global warming. Negative SLP anomaly area dominated during 1971–1995, indicating the effect of global warming before the Arctic warming being apparent. Since 1996 both positive and negative SLP anomaly areas are all small, being possibly caused by the sea-ice retreat during the Arctic warming.
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影响因子：
3.2
作者：
E. Kalnay;A. Dalcher
通讯作者：
E. Kalnay;A. Dalcher
影响因子：
--
作者：
M. Ogi;K. Yamazaki;Y. Tachibana
通讯作者：
M. Ogi;K. Yamazaki;Y. Tachibana
影响因子：
5.2
作者：
Knight, Jeff R.;Folland, Chris K.;Scaife, Adam A.
通讯作者：
Scaife, Adam A.
DOI：
--
发表时间：
2003
期刊：
--
影响因子：
--
作者：
J. Hurrell;Y. Kushnir;Geir Ottersen;M. Visbeck
通讯作者：
J. Hurrell;Y. Kushnir;Geir Ottersen;M. Visbeck
影响因子：
4.9
作者：
H. Douville;F. Chauvin;H. Broqua
通讯作者：
H. Douville;F. Chauvin;H. Broqua