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Eddy-induced cross-shelf export of high Chl-a coastal waters in the SE Bay of Biscay
Remote Sensing of Environment ( IF 13.5 ) Pub Date : 2018-02-01 , DOI: 10.1016/j.rse.2017.10.037
Anna Rubio , Ainhoa Caballero , Alejandro Orfila , Ismael Hernández-Carrasco , Luis Ferrer , Manuel González , Lohitzune Solabarrieta , Julien Mader

Abstract Different remote sensing data were combined to characterise a winter anticyclonic eddy in the southeastern Bay of Biscay and to infer its effects on cross-shelf exchanges, in a period when typical along shelf-slope currents depict a cyclonic pattern. While the joint analysis of available satellite data (infrared, visible and altimetry) permitted the characterisation and tracking of the anticyclone properties and path, data from a coastal high-frequency radar system enabled a quantitative analysis of the surface cross-shelf transports associated with this anticyclone. The warm core anticyclone had a diameter of around 50 km, maximum azimuthal velocities near 50 cm s− 1 and a relative vorticity of up to −0.45f. The eddy generation occurred after the relaxation of a cyclonic wind-driven current regime over the shelf-slope; then, the eddy remained stationary for several weeks until it started to drift northwards along the shelf break. The surface signature of this eddy was observed by means of high-frequency radar data for 20 consecutive days, providing a unique opportunity to characterise and quantify, from a Lagrangian perspective, the associated transport and its effect on the Chl-a surface distribution. We observed the presence of mesoscale structures with similar characteristics in the area during different winters within the period 2011–2014. Our results suggest that the eddy-induced recurrent cross-shelf export is an effective mechanism for the expansion of coastal productive waters into the adjacent oligotrophic ocean basin.

中文翻译:

涡流引起的比斯开东南湾高 Chl-a 沿海水域的跨货架出口

摘要 结合不同的遥感数据来表征比斯开湾东南部的冬季反气旋涡流,并推断其对跨大陆架交换的影响,在一个典型的沿陆架坡流描绘气旋模式的时期。虽然对可用卫星数据(红外、可见光和高度计)的联合分析允许对反气旋特性和路径进行表征和跟踪,但来自沿海高频雷达系统的数据能够对与此相关的表面跨架运输进行定量分析反气旋。暖核反气旋直径约为 50 km,最大方位速度接近 50 cm s- 1,相对涡度高达 -0.45f。涡旋产生发生在陆架坡上的气旋风驱动流态松弛之后;然后,涡流保持静止了几个星期,直到它开始沿着架子断裂向北漂移。通过连续 20 天的高频雷达数据观察到该涡流的表面特征,提供了一个独特的机会,可以从拉格朗日的角度表征和量化相关的传输及其对 Chl-a 表面分布的影响。我们在 2011-2014 年期间的不同冬季观察到该地区存在具有相似特征的中尺度结构。我们的研究结果表明,涡流引起的反复跨大陆架输出是沿海生产水域扩展到邻近贫营养海洋盆地的有效机制。通过连续 20 天的高频雷达数据观察到该涡流的表面特征,提供了一个独特的机会,可以从拉格朗日的角度表征和量化相关的传输及其对 Chl-a 表面分布的影响。我们在 2011-2014 年期间的不同冬季观察到该地区存在具有相似特征的中尺度结构。我们的研究结果表明,涡流引起的反复跨大陆架输出是沿海生产水域扩展到邻近贫营养海洋盆地的有效机制。通过连续 20 天的高频雷达数据观察到该涡流的表面特征,提供了一个独特的机会,可以从拉格朗日的角度表征和量化相关的传输及其对 Chl-a 表面分布的影响。我们在 2011-2014 年期间的不同冬季观察到该地区存在具有相似特征的中尺度结构。我们的研究结果表明,涡流引起的反复跨大陆架输出是沿海生产水域扩展到邻近贫营养海洋盆地的有效机制。我们在 2011-2014 年期间的不同冬季观察到该地区存在具有相似特征的中尺度结构。我们的研究结果表明,涡流引起的反复跨大陆架输出是沿海生产水域扩展到邻近贫营养海洋盆地的有效机制。我们在 2011-2014 年期间的不同冬季观察到该地区存在具有相似特征的中尺度结构。我们的研究结果表明,涡流引起的反复跨大陆架输出是沿海生产水域扩展到邻近贫营养海洋盆地的有效机制。
更新日期:2018-02-01
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