Large‐scale variabilities of wintertime wind stress curl field in the North Pacific and their relation to atmospheric teleconnection patterns
Large‐scale variabilities of wintertime wind stress curl field in the North Pacific and their relation to atmospheric teleconnection patterns
复制标题
北太平洋冬季风应力旋度场大尺度变量及其与大气遥相关型的关系
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
K. Hanawa
中科院分区：
文献类型：
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作者：
Y. Ishi;K. Hanawa
本文研究了北太平洋冬季风应力旋度（WSC）场的大尺度变化及其与大气遥相关型的关系。研究发现，冬季WSC异常的主导经验正交函数（α）和接下来的三个旋转正交模与大气遥相关型的模式对应良好，即，太平洋/北美（PNA）、西太平洋（WP）、热带/北方半球（TNH）和东太平洋（EP）遥相关型。第一模态的时间系数与北太平洋指数有较好的相关性，与太平洋年代际振荡指数也有一定的相关性。Sverdrup输送在25°N-30°N和42.5°N-47.5°N两个纬向带中具有很强的负相关性，这种变化可以用第一模态的强迫场来表示：PNA强迫使副极地和副极地涡旋同时自旋上升/自旋下降。
Wintertime wind stress curl (WSC) field in the North Pacific is investigated to reveal large‐scale variabilities and their relation to atmospheric teleconnection patterns. It is found that the leading empirical orthogonal function (EOF) and the next three rotated‐EOF modes of wintertime WSC anomalies well correspond to those of atmospheric teleconnection patterns, i.e., Pacific/North American (PNA), Western Pacific (WP), Tropical/Northern Hemisphere (TNH), and Eastern Pacific (EP) teleconnection patterns, respectively. Time coefficient of the first EOF mode well correlates with the North Pacific Index, and does with the Pacific Decadal Oscillation Index, to some degree. It is also found that Sverdrup transports in the two zonal bands of 25°N–30°N and 42.5°N–47.5°N have highly negative correlation and these variations can be represented by the forcing field of the first EOF mode: the PNA forcing makes both subtropical and subpolar gyres spin‐up/spin‐down simultaneously.