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首页> 外文会议>Conference on remote sensing of the ocean, sea ice, and large water regions >Effects of a frontal passage on surface salinity distribution along the Louisiana-Texas coast, USA from ocean color and model outputs
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Effects of a frontal passage on surface salinity distribution along the Louisiana-Texas coast, USA from ocean color and model outputs

机译：从海洋颜色和模型输出来看，额叶通道对美国路易斯安那州-得克萨斯州沿海地表盐度分布的影响

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Short-term and seasonal estimates of colored dissolved organic matter (CDOM) absorption at 412 nm and surface salinity were derived from the Sea-viewing Wide Field-of-view Sensor (SeaWiFS) satellite data for the Louisiana-Texas coast during 2005 using an empirical CDOM algorithm and a conservative CDOM-salinity relationship. Field measurements obtained during various seasons in 2005 indicated high correlations between field and satellite estimates of CDOM suggesting satellite estimates to be good representation of the surface CDOM and salinity fields. Discharge from the Mississippi and Atchafalaya rivers strongly influenced the seasonal surface CDOM distribution as well as during a frontal passage. Clear satellite imagery obtained before and after the passage of a cold front in March 2005 indicated a general decrease in surface CDOM and an offshore increase of elevated CDOM suggesting that frequent frontal passages contribute to mixing of riverine CDOM and its offshore transport. A comparison of SeaWiFS-derived salinity with the salinity outputs of a three-dimensional Navy Coastal Ocean Model (NCOM) indicated similar salinity trends offshore and a region of freshwater influence along the inner shelf. Following the frontal passage, changes in the surface salinity were observed mainly closer to the coast with a general increase in mid-shelf waters, likely due to mixing of lower salinity surface waters with higher salinity sub-surface waters. Short-term salinity model simulation could be improved with daily assimilation of river discharge data. SeaWiFS derived seasonal salinity estimates provided a synoptic view of the effects of coastal circulation and riverine discharge on shelf variability.
机译：路易斯安那州和得克萨斯海岸2005年的海洋宽视场传感器（SeaWiFS）卫星数据得出了412 nm处有色溶解有机物（CDOM）吸收和表面盐度的短期和季节性估计值，其中使用了经验CDOM算法和保守的CDOM-盐度关系。 2005年各个季节获得的野外测量结果表明，CDOM的野外估计与卫星估计值之间存在高度相关性，这表明卫星估计值可以很好地表示CDOM和盐度表层。密西西比河和阿恰法拉亚河的排放强烈影响了季节性地表CDOM的分布以及在正面通行期间。在2005年3月冷锋通过之前和之后获得的清晰卫星图像表明，地表CDOM总体下降，而高架CDOM则在离岸增加，这表明频繁的锋面通道有助于河流CDOM及其离岸运输的混合。将SeaWiFS衍生的盐度与三维海军沿海海洋模型（NCOM）的盐度输出进行比较，表明近海的盐度趋势相似，并且内架沿岸有淡水影响区域。在通过正面通道之后，主要在靠近海岸的地方观察到地表盐度的变化，中层架水普遍增加，这可能是由于较低盐度的地表水与较高盐度的地表下水混合所致。每日同化河流流量数据可以改善短期盐度模型的模拟。 SeaWiFS得出的季节性盐度估算值提供了沿海环流和河流排放对架子变化的影响的概要视图。

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