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首页> 外文期刊>Dynamics of Atmospheres and Oceans >Surface ocean response to synoptic-scale variability in wind stress and heat fluxes off south-central Chile
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Surface ocean response to synoptic-scale variability in wind stress and heat fluxes off south-central Chile

机译：智利中南部海域海洋对风应力和热通量天气尺度变化的响应

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摘要

The effect of the high frequency (synoptic) variability of wind and heat fluxes upon the surface ocean off south-central Chile (west coast of South America) is investigated using a regional ocean model. We focus our analysis in austral summer, when the regional wind experiences significant day-to-day variability superimposed on a mean, upwelling favorable flow. To evaluate the nature and magnitude of these effects, we performed three identical simulations except for the surface forcing: the climatological run, with long-term monthly mean wind-stresses and heat fluxes; the wind-synoptic run, with daily wind stresses and climatological heat fluxes; and the full-synoptic run, with daily wind-stresses and daily fluxes. The mean currents and surface geostrophic EKE fields show no major differences between simulations, and agree well with those observed in this ocean area. Nevertheless, substantially more ageostrophic EKE is found in the simulations which include synoptic variability of wind-stresses, impacting the total surface EKE and diffusivities, particularly south of Punta Lavapie (37° S), where the lack of major currents implies low levels of geostrophic EKE. Summer mean SSTs are similar in all simulations and agree with observations, but SST variability along the coast is larger in the runs including wind-stress synoptic variability, suggesting a rather linear response of the ocean to cycles of southerly wind strengthening and relaxation. We found that coastal SST variability does not change significantly in the first tenths of kilometers from the shore when including daily heat fluxes, highlighting the prominent role of wind-driven upwelling cycles. In contrast, in the offshore region situated beyond the 50 km coastal strip, it is necessary to include synoptic variability in the heat fluxes to account for a realistic SST variability.
机译：使用区域海洋模型研究了风和热通量的高频（天气）变化对智利中南部（南美西海岸）外海表层海洋的影响。我们将分析的重点放在南方夏季，这时区域风的日变化很大，并且平均上升气流顺风叠加。为了评估这些影响的性质和程度，我们进行了三个相同的模拟，除了表面强迫：气候运行，具有长期每月平均风应力和热通量；风速天气运行，每天有风压力和气候热通量；以及全天候运行，每天都有风压力和每天的通量。平均电流和地面地转EKE场在模拟之间没有显示出主要差异，并且与在该海域观测到的一致。然而，在模拟中发现了明显更多的变质EKE，包括风应力的天气变化，影响了整个表面EKE和扩散率，特别是蓬塔拉瓦皮（Punta Lavapie）以南（37°S），那里缺少大电流就意味着低水平的地转EKE。夏季平均海表温度在所有模拟中均相似，并且与观测结果一致，但沿海岸的海表温度变化在包括风应力天气变化在内的运行中较大，表明海洋对南风增强和松弛周期的线性响应相当大。我们发现，在包括每日热通量在内，离海岸的十分之一公里内，沿海SST的变化并没有显着变化，这突显了风动力上升周期的重要作用。相反，在位于50 km沿海带以外的近海区域，有必要在热通量中包括天气变化，以解决实际的SST变化。

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