Seasonal to interannual variations of the western boundary current of the subarctic North Pacific by a combination of the altimeter and tide gauge sea levels
Seasonal to interannual variations of the western boundary current of the subarctic North Pacific by a combination of the altimeter and tide gauge sea levels
复制标题
结合高度计和潮汐计海平面得出的亚北极北太平洋西边界流的季节到年际变化
DOI：
10.1029/2005jc003080
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发表时间：
2006
影响因子：
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通讯作者：
H. Kawamura
中科院分区：
文献类型：
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作者：
O. Isoguchi;H. Kawamura
[1]季节年际变化的东堪察加电流（EKC）和Oyashio检查集中在他们的正压响应风强迫高度计派生和验潮仪海平面的组合使用。对9年测高海平面图进行了经验正交函数分析。第二个涡旋（EOF 2）显示了副北极环流的旋转上升和旋转下降，其时间变化几乎是由随时间变化的Sverdrup平衡。在Petropavlovsk-Kamchatsky（PK）验潮仪海平面同意EOF 2和Sverdrup运输方面不仅季节性变化，而且每年的变化在冬季时，亚北极环流旋转了最。我们还检测到两种类型的EKC/Oyashio变化从高度计数据：海平面扰动和地转速度异常的漂移速度。这两个EKC/Oyashio时间变化也是由Sverdrup平衡解释的，并与PK海平面和EOF 2一致。结果表明，PK海平面可以很好地代表亚北极环流和EKC/Oyashio变化。在此基础上，讨论了冬季大气环流的年际变化。PK的44年冬季海平面与冬季Sverdrup运输和日本东北海岸的春季海面温度与十年尺度的变化。这表明，EKC/Oyashio主要是由正压响应大尺度大气强迫和波动的年代际时间尺度几乎与大气变化的相位和影响的海洋条件日本东部。
[1] Seasonal to interannual variations of the East Kamchatka Current (EKC) and the Oyashio are examined by focusing on their barotropic response to wind forcing by a combined use of altimeter-derived and tide gauge sea levels. An empirical orthogonal function (EOF) analysis is performed on the 9-year altimeter sea level maps with thermosteric signals removed. A second EOF (EOF2) shows a spin-up and spin-down of the subarctic gyres, and its temporal variation is almost accounted for by the time-dependent Sverdrup balance. Tide gauge sea levels at Petropavlovsk-Kamchatsky (PK) agree with EOF2 and the Sverdrup transports in terms of not only the seasonal variation but also its year-to-year variability in winter when the subarctic gyre is spun up most. We also detect two types of EKC/Oyashio variations from the altimeter data: drifting velocities of sea level disturbances and geostrophic velocity anomalies. These two EKC/Oyashio temporal variations are also accounted for by the Sverdrup balance and agree with the PK sea levels and EOF2. The results imply that the PK sea levels can be a good representative of the subarctic gyre and EKC/Oyashio variations. On the basis of this relation, interannual variations during winter are discussed. The 44-year wintertime sea levels at PK correlate with the wintertime Sverdrup transport and springtime sea surface temperature off the northeastern coast of Japan with decadal-scale variability. This demonstrates that EKC/Oyashio is primarily explained by a barotropic response to large-scale atmospheric forcing and fluctuates on a decadal timescale almost in phase with atmospheric changes and influences the oceanic condition east of Japan.
影响因子：
5.2
作者：
O. Isoguchi;H. Kawamura
通讯作者：
O. Isoguchi;H. Kawamura
HIRAI,M.：Am.J.Primatol.(1989)
DOI：
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