Effects of the Pacific diapycnal mixing and wind stress on the global and Pacific meridional overturning circulation
Effects of the Pacific diapycnal mixing and wind stress on the global and Pacific meridional overturning circulation
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DOI：
10.1175/jpo2792.1
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发表时间：
2005-10
影响因子：
3.5
通讯作者：
R. Furue;M. Endoh
中科院分区：
文献类型：
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作者：
R. Furue;M. Endoh
利用一个理想的盆地进行了数值试验，研究了太平洋深层垂直扩散率和风应力在全球和太平洋经向翻转环流中的作用。太平洋中深层扩散系数增强了全球经向翻转环流，当这部分扩散系数减小到背景值时，不仅太平洋的层状环流大大减弱，而且北大西洋深水(NADW)和南极底层水(AABW)的产量也显著减少。在模式中，太平洋扩散率的较深部分增强了AABW的生产。当太平洋风应力关闭时，太平洋深部经向翻转环流减少，NADW和AABW的产量也显著减少。这可能是由于亚极区和赤道地区的风增强上升流减少所致。这些结果表明，太平洋的昼夜扩散和海面状况不仅对太平洋内部环流，而且对全球经向翻转环流都具有重要意义。
Numerical experiments are conducted using an idealized basin to investigate roles of the deep vertical diffusivity and wind stress of the Pacific Ocean in the global and Pacific meridional overturning circulation. The Pacific middepth diffusivity is found to be enhancing the global meridional overturning circulation; when this part of diffusivity is reduced to the background value, not only is the layered circulation of the Pacific greatly weakened, but also the production of the North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW) is significantly reduced. The deeper part of the Pacific diffusivity is found to be enhancing the production of the AABW in the model. When the wind stress is turned off in the Pacific, the deep meridional overturning circulation of the Pacific is reduced and the production of the NADW and AABW is also significantly reduced. This is likely due to the reduction of the wind-enhanced upwelling in the subpolar and equatorial regions. These results suggest the importance of the diapycnal diffusion and sea surface conditions in the Pacific not only to the circulation within the Pacific but also to the global meridional overturning circulation.