Propagation of North Pacific interdecadal subsurface temperature anomalies in an ocean GCM
Propagation of North Pacific interdecadal subsurface temperature anomalies in an ocean GCM
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DOI：
10.1029/2000gl011488
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发表时间：
2000-11
影响因子：
5.2
通讯作者：
M. Nonaka;S. Xie
中科院分区：
文献类型：
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作者：
M. Nonaka;S. Xie
利用观测到的海温异常强迫的海洋环流模式，研究了次表层北太平洋年代际变化的传播。副热带北太平洋中部俯冲的次表层温度异常比被动的“温度”示踪器更偏西，到达分叉纬度以北的西部边界。这阻止了它们向赤道延伸。另一方面，在副热带涡旋和亚北极涡旋的交界处，500m高空热含量异常以Rossby波的高垂直模的形式向东传播，受平均东向流的影响。这一观点得到了地下温度异常的反转迹象的支持。
Propagation of subsurface North Pacific interdecadal variations is investigated with an ocean general circulation model forced by observed sea surface temperature anomalies. Subsurface temperature anomalies subducted in the central subtropical North Pacific take a more westward pathway than a passive “temperature” tracer and reach the western boundary to the north of the bifurcation latitude. This prevents them from extending into the equator. On the boundary between the subtropical and the subarctic gyres, on the other hand, the upper 500 m heat content anomaly is found to propagate eastward as high vertical modes of Rossby waves advected by the mean eastward current. This notion is supported by a sign reversal in temperature anomaly underneath.