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首页> 外文期刊>Continental Shelf Research: A Companion Journal to Deep-Sea Research and Progress in Oceanography >Surface temperature, chlorophyll and advection patterns during a summer upwelling event off central Portugal
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Surface temperature, chlorophyll and advection patterns during a summer upwelling event off central Portugal

机译：葡萄牙中部夏季夏季上升事件期间的表面温度，叶绿素和对流模式

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摘要

Satellite-derived sea surface temperature (SST) and chlorophyll ([Chl]) concentration maps are used together with numerical models to study the advection patterns observed during a summer upwelling event off central Portugal, a region characterized by a complex coastline and bathymetry. It is shown that the model solutions realistically reproduce the main patterns of spatial and temporal SST variability, namely the 2-2.5 degrees C decrease in the active upwelling areas during the wind intensification phase, the 1-day lag between the peak of the northerlies and minimum SST, and the small SST variability in the sheltered embayments. The expected circulation features are reproduced in the model solutions: the strong along-slope flows, the development of filaments and separated jets, shadow areas downstream of main capes, frontal-scale instabilities and the rapid onset of coastal counter currents along the inshore zone during relaxation. The evolution of the oceanographic conditions, specifically the mixed layer depth and horizontal velocity, and the advection patterns obtained from a Lagrangian model are compared with the observed SST and [Chl] variability. The results imply that the potential phytoplankton accumulation/growth (PPAG) areas are characterized by surface temperatures lower than 16.5 degrees C, mixed layer depth and horizontal velocity less than 30 m and 0.3 m/s, respectively. It is shown that remotely-sensed [Chl] concentration patterns, namely its asymmetric distribution relative to SST during the intense wind phase, is primarily related to the mixed layer depth and secondly to the horizontal velocity. The trajectories obtained with the Lagrangian model confirmed earlier suggestions of the presence of recirculation cells, downstream of the capes where the coastal jet separates from the coast, and revealed that significant vertical displacements occur in these cells.
机译：卫星衍生的海面温度（SST）和叶绿素（[Chl]）浓度图与数值模型一起用于研究葡萄牙中部（以复杂的海岸线和测深为特征的地区）夏季上升流事件期间观测到的对流模式。结果表明，模型解决方案真实地再现了空间和时间SST变异性的主要模式，即在风增强阶段活动上升流区下降了2-2.5摄氏度，北风峰和北风峰之间的1天滞后。 SST最小，并且掩蔽处的SST变异小。预期的环流特征在模型解决方案中得以再现：强烈的顺坡流动，细丝和分离射流的发育，主角下游的阴影区，额尺尺度的不稳定性以及在沿岸地区沿海岸带的逆流迅速开始松弛。将海洋条件的演变，特别是混合层深度和水平速度，以及从拉格朗日模型获得的对流模式与观测到的海温和[Chl]变异性进行了比较。结果表明，潜在的浮游植物积累/生长（PPAG）区域的特征是表面温度低于16.5摄氏度，混合层深度和水平速度分别低于30 m和0.3 m / s。结果表明，遥感[Chl]浓度模式，即在强风阶段相对于SST的不对称分布，主要与混合层深度有关，其次与水平速度有关。用拉格朗日模型获得的轨迹证实了较早的建议，即在沿海急流与海岸分开的海角下游，存在再循环池，并表明在这些池中发生了明显的垂直位移。

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