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Interannual and interdecadal variations in the North Atlantic Oscillation spatial shift

ISSN号：1000-0240
期刊名称：《冰川冻土》
时间：0
分类：P732.6[天文地球—海洋科学] P425.42[天文地球—大气科学及气象学]
作者机构：[1]Key Laboratory of Western China's Environmental Systems (Ministry of Education), Lanzhou University, Lanzhou 730000, China, [2]Institute of Geosciences, University ofKiel, Kiel D-24118, Germany
相关基金：This work was supported by the National Basic Research Program of China （2010CB950204）, the Innovation Team Project of the National Natural Science Foundation of China （40721061）, and the 111 Project （B06026）. The 20th Century Reanalysis V2 data used in this study are from NOAA/ OAR/ESRL PSD, Boulder, Colorado, USA （http：//www.esrl.noaa.gov/psd/）.

作者： ZHANG XiaoJian[1], JIN LiYa[1,2], CHEN ChunZhu[1], GUAN DongSheng[1], LI MingZhi[1]

关键词：北大西洋涛动, 年际时间尺度, 空间转移, 年代际变化, ROSSBY波, 审计署, NAO, 压力异常, North Atlantic Oscillation, spatial shift, interannual variation, interdecadal variation, zonal winds

中文摘要：

北方大西洋摆动(NAO ) 的空间移动被使用 2 数据集和识别 NAO 行动在吝啬的海平面的压力(SLP ) 异例印射的冬季直接集中的第二十个世纪分析版本分析。NAO 的空间移动被四个 NAO 空间移动索引描绘：NAO 南部、北的行动中心的带、南方的移动。NAO 行动中心的带、南方的移动趋势沿着西南西北方向的一条路径移动，这被发现。光谱分析证明四个 NAO 空间移动索引有 26 年的频率， NAO 索引以高周波的变化有 23 年的频率。在十的时间规模上， NAO 空间移动索引是仔细(断然) 与 NAO 有关索引，它与在 NAO 索引和 NAO 模式的空间移动之间的关系的以前的研究一致。然而，在 NAO 索引和 interannual 时间规模上的北行动中心的南方的移动之间没有关系。在 NAO 索引和 NAO 空间移动索引的 interannual 可变性之间的重要关系是很可能的与摘要规模的 Rossby 波浪碎被联系，它产生表面压力异例并且因此影响 NAO 的阶段和模式。冬季的关联超过 90 的西的风

英文摘要：

The spatial shift of the North Atlantic Oscillation （NAO） is analyzed by using the Twentieth Century Reanalysis version 2 dataset and identifying NAO action centers directly on winter mean sea-level pressure （SLP） anomaly maps. The spatial shift of the NAO is characterized by four NAO spatial shift indices： the zonal and meridional shifts of the NAO southern and northern action cen- ters. It is found that the zonal and meridional shift trends of the NAO action centers move along a path of southwest-northwest direction. Spectral analysis shows that the four NAO spatial shift indices have periodicity of 2-6 years and the NAO index has periodicity of 2-3 years in terms of high-frequency variations. On a decadal time scale, the NAO spatial shift indices are closely （positively） related to the NAO index, which is in agreement with previous studies of the relationship between the NAO index and the spatial shift of the NAO pattern. However, there is no relationship between the NAO index and the meridional shift of the northern action center on an interannual time scale. The significant relationship between the NAO index and the interannual vari- ability of NAO spatial shift indices is very likely to be associated with synoptic-scale Rossby wave breaking, which generates surface pressure anomalies and thus affects the phase and pattern of the NAO. The correlations of winter westerly winds over 90°W-0° and the NAO index and the NAO spatial shift indices have a ‘＋ - ＋ -＇ structure from the Equator to the North Pole. Although there is close correlation between the NAO spatial shift indices and the strength of the zonal winds in the North Atlantic region, the effect of the zonal winds on the NAO spatial shift differs at different latitudes. Hence, the role of the zonal winds is probably a result of the NAO spatial shifts.

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