Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass
Evidence that satellites sense the cross-sectional area of suspended particles in shelf seas and estuaries better than their mass
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DOI：
10.1007/s00367-011-0259-6
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发表时间：
2012-04
影响因子：
2.1
通讯作者：
D. Bowers;K. Braithwaite
中科院分区：
文献类型：
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作者：
D. Bowers;K. Braithwaite
在陆架海和河口悬浮沉积物遥感定量算法传统上试图将卫星辐射计感测到的信号与悬浮颗粒的质量联系起来。然而，本文提出的现场测量表明，在海面上的辐照反射系数是更密切相关的thecross-sectional areaof悬浮颗粒比它们的质量。因此，其他光学性质（在浑浊的水中取决于颗粒面积）可以直接与反射系数相关。为了从质量浓度的角度解释卫星数据（例如，为了测试悬浮泥沙输运的数值模型），必须知道颗粒的面积和质量之间的关系。对于2008-2009年英国西部沿海沃茨的数据集，对于给定尺寸和质量的颗粒，颗粒横截面积的变化系数为5。这种变化的原因目前知之甚少。
Quantitative algorithms for the remote sensing of suspended sediments in shelf seas and estuaries have traditionally sought to relate the signal sensed by the satellite radiometer to themassof particles in suspension. In situ measurements presented in this paper, however, show that the irradiance reflection coefficient at the sea surface is more closely related to thecross-sectional areaof particles in suspension than to their mass. Other optical properties (which in turbid water depend on particle area) can therefore be related directly to the reflection coefficient. To interpret satellite data in terms of mass concentration (for testing numerical models of suspended sediment transport, for example), it is necessary to know the relationship between the area and mass of the particles. For the 2008–2009 dataset presented here for western UK coastal waters, the particle cross-sectional area varies by a factor of 5 for particles of a given size and mass. The causes of this variation are currently poorly understood.