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首页> 外文期刊>Journal of Physical Oceanography >Covariability of Near-Surface Wind Speed Statistics and Mesoscale Sea Surface Temperature Fluctuations
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Covariability of Near-Surface Wind Speed Statistics and Mesoscale Sea Surface Temperature Fluctuations

机译：近地表风速统计和中尺度海面温度波动的协变性

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摘要

The atmospheric (ABL) and ocean (OBL) boundary layers are intimately linked via mechanical and thermal coupling processes. In many regions over the world's oceans, this results in a strong covariability between anomalies in wind speed and SST. At oceanic mesoscale, this coupling can be driven either from the atmosphere or the ocean. Gridded SST and wind speed data at 0.25 degrees resolution show that over the western North Atlantic, the ABL mainly responds to the OBL, whereas in the eastern North Pacific and in the Southern Ocean, the OBL largely responds to wind speed anomalies. This general behavior is also verified by in situ buoy observations in the Atlantic and Pacific. A stochastic, nondimensional, 1D coupled air-sea boundary layer model is utilized to assess the relative importance of the coupling processes. For regions of little intrinsic SST fluctuations (i.e., most regions of the world's oceans away from strong temperature fronts), the inclusion of cold water entrainment at the thermocline is crucial. In regions with strong frontal activities (e.g., the western boundary regions), the coupling is dominated by the SST fluctuations, and the frontal variability needs to be included in models. Generally, atmospheric and ocean-driven coupling lead to an opposite relationship between SST and wind speed fluctuations. This effect can be especially important for higher wind speed quantiles.
机译：大气（ABL）和海洋（OBL）边界层通过机械和热耦合过程紧密相连。在世界海洋的许多地区，这导致风速和SST异常之间具有很强的协变性。在海洋中尺度上，这种耦合既可以来自大气，也可以来自海洋。网格SST和0.25度分辨率的风速数据显示，在北大西洋西部，ABL主要对OBL做出响应，而在北太平洋东部和南大洋，OBL在很大程度上对风速异常做出响应。大西洋和太平洋的原位浮标观测也证实了这种一般行为。利用随机的，无量纲的一维耦合海海边界层模型来评估耦合过程的相对重要性。对于SST内在波动很小的区域（即，世界上大部分海洋都远离强温度前沿），在温跃层中夹带冷水至关重要。在锋线活跃度较高的区域（例如西部边界区域），耦合主要受SST涨落的影响，并且模型中需要包括锋线变异性。通常，大气和海洋驱动的耦合导致海表温度和风速波动之间的关系相反。对于较高的风速分位数，此效果可能尤其重要。

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