Effect of bottom slope in northeastern North Pacific on deep-water upwelling and overturning circulation
Effect of bottom slope in northeastern North Pacific on deep-water upwelling and overturning circulation
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北太平洋东北部底坡对深水上升流和翻转环流的影响
DOI：
10.1007/s10872-011-0094-4
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发表时间：
2012
影响因子：
2.3
通讯作者：
Fujio
中科院分区：
文献类型：
--
作者：
Kawabe;Fujio
水文资料显示，北太平洋东北部47°N经向深流较弱且南移；预计在平底海洋中出现上升流的强劲北流并不存在。这可能意味着东北太平洋盆地东升的底坡有助于翻转环流。在对观测数据进行分析后，我们使用深水进入下深层、上升到上深层、然后横向退出的模型来检验底坡效应。分析模型基于地转静水平衡、Sverdrup 关系和密度垂直平流扩散平衡，并包含小底部坡度和向东增加的上升流。由于底部倾斜，下深层水流向底增强，垂直涡扩散系数（KV）越大，层结作用越弱，上升流向东增加幅度越小，增强作用越弱。改变KV的值会改变电流的垂直结构和方向；随着 KV 的增加，洋流变得更加正压并进一步向东流动。向东的水流是用数值模型再现的，该模型结合了实际的底部坡度梯度并包括边界水流。内流主要向东流动，沿底部斜坡向上流动，并产生上升流。东向洋流具有与净流入相似的真实体积输送，这与平底的大北向洋流不同。上深层的上升水流先向南流动，然后在南部地区向西流动，但也可能部分上涌至中层。
Hydrographic data show that the meridional deep current at 47°N is weak and southward in northeastern North Pacific; the strong northward current expected for an upwelling in a flat-bottom ocean is absent. This may imply that the eastward-rising bottom slope in the Northeast Pacific Basin contributes to the overturning circulation. After analysis of observational data, we examine the bottom-slope effect using models in which deep water enters the lower deep layer, upwells to the upper deep layer, and exits laterally. The analytical model is based on geostrophic hydrostatic balance, Sverdrup relation, and vertical advection–diffusion balance of density, and incorporates a small bottom slope and an eastward-increasing upwelling. Due to the sloping bottom, current in the lower deep layer intensifies bottomward, and the intensification is weaker for larger vertical eddy diffusivity (KV), weaker stratification, and smaller eastward increase in upwelling. Varying the value ofKVchanges the vertical structure and direction of the current; the current is more barotropic and flows further eastward asKVincreases. The eastward current is reproduced with the numerical model that incorporates the realistic bottom-slope gradient and includes boundary currents. The interior current flows eastward primarily, runs up the bottom slope, and produces an upwelling. The eastward current has a realistic volume transport that is similar to the net inflow, unlike the large northward current for a flat bottom. The upwelling water in the upper deep layer flows southward and then westward in the southern region, although it may partly upwell further into the intermediate layer.
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影响因子：
2.3
作者：
Kawabe, Masaki;Fujio, Shinzou
通讯作者：
Fujio, Shinzou
关于北太平洋北部边界深流的一些初步结果
DOI：
--
发表时间：
1985
期刊：
影响因子：
--
作者：
B. Warren;W. Owens
通讯作者：
W. Owens
穿过北太平洋皇帝海山链主峡的深循环流
DOI：
--
发表时间：
2009
期刊：
Deep-Sea Research Part1 56
影响因子：
--
作者：
Komaki K.;Kawabe M.
通讯作者：
Kawabe M.
地形对热带北大西洋西部底层水环流的影响
DOI：
10.1016/0967-0637(93)90137-r
发表时间：
1993
期刊：
--
影响因子：
--
作者：
M. Kawase
通讯作者：
M. Kawase
从上方均匀加热、从下方非均匀冷却的水平流体层中的稳定对流运动
影响因子：
2
作者：
H. Stommel;G. Veronis
通讯作者：
G. Veronis