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Assessment of chlorophyll variability along the Louisiana coast using multi-satellite data

机译：使用多卫星数据评估路易斯安那州沿海地区的叶绿素变异性

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摘要

Variability in surface chlorophyll (Chl) concentrations derived from the Sea-Viewing Wide Field-of-View Sensor (SeaWiFS) were examined in conjunction with river discharge, QuikSCAT satellite-derived winds, and sea surface height (SSH) anomaly data along the Louisiana coast, USA. Surface Chl distributions exhibited rapid response to strong northerly winds following a frontal passage. A comparison of time series (1998-2010) river discharge and monthly Chl data indicated Chl variability to be well correlated to seasonal river discharge only for locations near the two river deltas, while offshore, enhancements in Chl during fall-winter was likely due to cross-shelf transport or mixing associated with strong northerly wind stress. Variance in Chl examined using wavelet analysis applied to nearly 10 years (1998-2007) of SeaWiFS data indicated patterns of significant Chl variability due to combined enhanced wind and river discharge, offshore flows associated with Ekman transport and coastal wind convergence, and the effect of Hurricane Rita in 2005. Instances of significant Chl variance were also observed to occur during years of large hypoxic zone size suggesting potential linkages to hypoxia. SSH anomaly imagery indicated the presence of warm-core eddies that were responsible for the offshore dispersal of elevated Chl observed in the monthly SeaWiFS imagery. Overall, the use of multi-satellite data better described the forcing and patterns of Chl distributions along the river-dominated Louisiana coast and shelf.
机译：结合河流流量，QuikSCAT卫星产生的风和路易斯安那州沿岸的海面高度（SSH）异常数据，研究了源自海面宽视场传感器（SeaWiFS）的表面叶绿素（Chl）浓度的变化。美国海岸。正面通道通过后，地面Chl分布表现出对强北风的快速响应。对时间序列（1998-2010）河流流量和每月Chl数据的比较表明，仅在两个河三角洲附近的地区，Chl变异性与季节性河流流量有很好的相关性，而在海上，秋冬季期间Chl的增强可能是由于与强北风有关的跨架运输或混合。使用小波分析对Chl进行的方差分析应用于近10年（1998-2007）的SeaWiFS数据表明，由于风和河流量的共同增强，与埃克曼运输和沿海风汇合有关的近海流量以及在2005年的丽塔飓风中。在大量缺氧区域较大的年份中，也观察到了显着的Chl变化实例，表明可能与缺氧有关。 SSH异常图像表明存在暖核涡流，这些涡流是在每月SeaWiFS图像中观察到的升高的Chl在海上扩散的原因。总体而言，多卫星数据的使用更好地描述了沿河支配的路易斯安那海岸和陆架的Chl分布的强迫和模式。

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