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首页> 外文期刊>Journal of Geophysical Research, C. Oceans: JGR >Evidence of upwelling events at the northern Patagonian shelf break
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Evidence of upwelling events at the northern Patagonian shelf break

机译：巴塔哥尼亚北部陆架断裂上升流事件的证据

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摘要

The Patagonian shelf break marks a transition between relative warm-fresh shelf waters and relative cold-salty Subantarctic Water advected northward by the Malvinas Current. From early spring to late autumn, the outer shelf region is characterized by a band of high chlorophyll concentration that sustains higher trophic levels, including significant fisheries. We analyze time series of current and water mass property observations collected at two moorings deployed at the shelf edge at 418S and 43.88S to investigate what mechanisms lead to temperature variability at the shelf break, and their role on the nutrient supply to the upper layer. The in situ data are combined with satellite-derived observations of sea surface temperature and chlorophyll a to analyze a sharp cooling event at the outer shelf that lasted 10 days and extended ~500 km along the outer shelf. The event is consistent with upwelling of cold waters through the base of the mixed layer. The vertical velocity required to explain the observed cooling is 13–29 m d~(-1). Satellite-derived sea surface temperature reveals additional cooling events of similar characteristics. Seventy-five percent of these events are concurrent with surface chlorophyll increase over a 5 day period suggesting that cooling events observed at the shelf break are associated with nutrient fluxes that promote the growth of phytoplankton.
机译：巴塔哥尼亚的陆架断裂标志着马尔维纳斯洋流向北平移的相对温暖的新鲜陆架水和相对冷的亚咸水之间的过渡。从早春到深秋，外部架子区的特征是高叶绿素浓度带，维持较高的营养水平，包括重要的渔业。我们分析了在418S和43.88S在架子边缘部署的两个系泊处收集的当前和水质特性观测值的时间序列，以调查导致架子破裂的温度变化的机理及其对上层养分供应的作用。将原位数据与卫星对海面温度和叶绿素a的观测相结合，以分析持续10天并沿外层架延伸约500 km的外层架的急剧降温事件。该事件与通过混合层底部的冷水上升流一致。解释观测到的冷却所需的垂直速度为13–29 m d〜（-1）。来自卫星的海面温度揭示了具有类似特征的其他降温事件。这些事件中有75％与5天期间表面叶绿素的增加同时发生，这表明在货架期观察到的降温事件与促进浮游植物生长的营养通量有关。

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