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首页> 外文学位 >Coastal oceanography applications of spaceborne synthetic aperture radar (SAR) in the Middle Atlantic Bight (MAB).
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Coastal oceanography applications of spaceborne synthetic aperture radar (SAR) in the Middle Atlantic Bight (MAB).

机译：星空合成孔径雷达（SAR）在中大西洋大西洋（MAB）中的沿海海洋学应用。

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摘要

This study provides basic interpretative tools necessary to understand spaceborne synthetic aperture radar (SAR) observations of ocean surface signatures in the Middle Atlantic Bight (MAB). The research focuses on SAR imaged features related to dynamical processes over the continental shelf and near-shelf region. Particular attention is given to signatures acquired during summer upwelling. Other processes and features addressed include the detection of coastal plumes and fronts, oceanic internal waves, bathymetric features, as well as ocean surface atmospheric signatures prevalent in SAR imagery.; The ability of SAR to detect upwelling conditions and track their evolution in the MAB is demonstrated. The connection between localized low backscatter and seasonal upwelling in the coastal zone is established for the first time using spaceborne SAR together with supporting in situ and satellite thermal and ocean color data. Reduced backscatter over areas of active upwelling is attributed to a combination of factors including water viscosity, atmospheric stability, and the presence of biogenic slicks. Low backscatter patterns imaged by SAR are found to match upwelling patterns in satellite sea surface temperature (SST) observations. The abundance of slick filaments within upwelling areas is frequently indicated by SAR and supports satellite ocean color observations of enhanced biological activity resulting from upwelling-enhanced nutrient availability.; Backscatter sensitivity to SST under slick-free conditions is investigated. A coefficient of thermal stability is defined using a simplified thermal front model. The coefficient parameterizes the change in backscatter as a function of boundary layer stability and wind speed. Its dependence on wind speed and on the atmospheric diabatic state is found to be similar to that of the drag coefficient. Values for the coefficient of thermal stability are also in general agreement with previous results based on tower radar observations.; The ability of SAR sea surface roughness observations to capture outflow patterns from multiple estuarine sources along the MAB coast is documented. In particular, the spaceborne imaging of a Delaware Bay twin-front plume is shown and its recurrent nature confirmed. Spaceborne SAR imaging of estuarine outflow patterns is found to be consistent with available airborne data and historical in situ salinity observations.
机译：这项研究提供了必要的基本解释工具，以了解太空合成孔径雷达（SAR）对中大西洋大西洋（MAB）海洋表面特征的观测。这项研究的重点是与大陆架和近陆架区域动力学过程相关的SAR成像特征。特别注意在夏季上升期间获得的签名。解决的其他过程和特征包括探测沿海羽流和锋面，海洋内部波浪，测深特征以及SAR图像中普遍存在的海洋表面大气特征。 SAR具有检测上升流条件并跟踪其在MAB中的演化的能力。首次使用星载SAR结合支持的“原位”和“卫星”热卫星和海洋颜色数据，首次建立了沿海地区局部低反向散射与季节性上升之间的联系。主动上升流区域内反向散射的减少归因于多种因素的综合作用，包括水的粘度，大气稳定性和生物浮油的存在。 SAR成像的低反向散射图样与卫星海面温度（SST）观测中的上升流图相匹配。 SAR经常表明上升流区域内的光滑丝丰富，并支持卫星海洋颜色观测，即上升流增强了养分的利用率，从而增强了生物活性。研究了在无光滑条件下对SST的反向散射灵敏度。使用简化的热锋模型定义热稳定性系数。该系数将反向散射的变化参数化为边界层稳定性和风速的函数。发现其对风速和大气绝热状态的依赖性与阻力系数的依赖性相似。热稳定性系数的值也通常与基于塔式雷达观测的先前结果一致。记录了SAR海面粗糙度观测值以捕获来自MAB海岸的多个河口源的流出模式的能力。特别是，显示了特拉华湾双前羽的空间成像，并证实了其反复性。研究发现，河口流出模式的星载SAR成像与可用的机载数据和历史盐度观测结果一致。

著录项

  • 作者

    Clemente-Colon, Pablo.;

  • 作者单位

    University of Delaware.;

  • 授予单位 University of Delaware.;
  • 学科 Physical Oceanography.; Remote Sensing.
  • 学位 Ph.D.
  • 年度 2002
  • 页码 233 p.
  • 总页数 233
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋物理学;遥感技术;
  • 关键词

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