Poleward Heat Transport in a Barotropic Ocean Model
Poleward Heat Transport in a Barotropic Ocean Model
复制标题
正压海洋模型中的向极热传输
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
J. Marotzke
中科院分区：
文献类型：
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作者：
Xiaoli Wang;P. Stone;J. Marotzke
摘要采用正压海洋环流模式耦合混合层温度方程，研究了水平风驱动洋流向极地的热输送。通过尺度分析，发现了两种不同的热输运模式，其特征分别为λ→∞和λ→0，其中λ为海洋平流时间尺度与海气界面牛顿冷却恢复时间尺度之比。在λ→∞区间，热输运与盆地东西向宽度和风应力旋度的二次幂λ−1成正比。在λ→0状态下，热输运与λ和盆地宽度成正比，对风应力旋度的大小不敏感。在λ的中间值处，热输运最大，数值实验表明，在5个月的恢复时间尺度下，深500 m、宽400 km的正压方形盆地（北大西洋大小）的热输运最大。对应的最大热传递…
Abstract A barotropic ocean circulation model coupled to a mixed-layer temperature equation is used to study the poleward heat transport by the horizontal wind-driven ocean currents. Through scaling analyses, two different regimes of the heat transport are found, characterized by λ→∞ and λ→0, respectively, where λ is the ratio between the ocean advection timescale and the restoring timescale of Newtonian cooling at the air–sea interface. In the regime λ→∞, the heat transport is proportional to λ−1 and to the second power both of the basin east–west width and of the magnitude of wind stress curl. In the regime λ→0, the heat transport is proportional to λ and to the basin width, and insensitive to the magnitude of wind stress curl. The heat transport is a maximum for intermediate values of λ, and the numerical experiments show that a restoring timescale of 5 months maximizes the heat transport for a barotropic square basin 500 m deep and 400 km wide (North Atlantic size). The corresponding maximum heat tran...