An estimate of the suspended particulate matter (SPM) transport in the southern North Sea using SeaWiFS images, in situ measurements and numerical model results
An estimate of the suspended particulate matter (SPM) transport in the southern North Sea using SeaWiFS images, in situ measurements and numerical model results
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DOI：
10.1016/j.csr.2007.01.017
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发表时间：
2007-06-01
影响因子：
2.3
通讯作者：
Van den Eynde, Dries
中科院分区：
文献类型：
--
作者：
Fettweis, Michael;Nechad, Bouchra;Van den Eynde, Dries
本文提出了一项研究，其中卫星图像（SeaWiFS），现场测量（潮汐周期和快照）和二维流体动力学数值模型相结合，计算了通过多佛海峡和北海南部的长期悬浮颗粒物（SPM）运输。经多佛海峡输送到北海的SPM总量估计为31.74 x 10(6) t。卫星图像提供了SPM浓度分布的概观视图，但不能消除SPM输送计算的不确定性。这是由于SPM浓度随潮汐、风、春小潮周期和季节的变化而变化。短期变化（潮汐，春季小潮周期）在卫星图像中没有发现，但是季节变化是清晰可见的。此外，卫星图像中的SPM浓度通常低于现场测量值。因此，通过比较现场测量所得的SPM浓度变异性与遥感数据所得的SPM浓度变异性，对用于计算长期输送的卫星SPM浓度图的代表性进行了研究。卫星图像最重要的制约因素是卫星数据是晴空条件的证据，而船舶的现场测量也可以在恶劣的气象条件下进行，而且由于卫星图像的时间分辨率太低，经常错过SPM浓度峰值。在高浊度地区，应至少在一个潮汐周期内进行SPM浓度测量，以获得具有代表性的SPM浓度值。(c) 2007 Elsevier Ltd.版权所有。
A study is presented where satellite images (SeaWiFS), in situ measurements (tidal cycle and snapshot) and a 2D hydrodynamic numerical model have been combined to calculate the long term SPM (Suspended Particulate Matter) transport through the Dover Strait and in the southern North Sea. The total amount of SPM supplied to the North Sea through the Dover Strait is estimated to be 31.74 x 10(6) t. The satellite images provide synoptic views of SPM concentration distribution but do not take away the uncertainty of SPM transport calculation. This is due to the fact that SPM concentration varies as a function of tide, wind, spring-neap tidal cycles and seasons. The short term variations (tidal, spring-neap tidal cycle) have not been found in the satellite images, however seasonal variations are clearly visible. Furthermore the SPM concentration in the satellite images is generally lower than in the in situ measurements. The representativness of SPM concentration maps derived from satellites for calculating long term transports has therefore been investigated by comparing the SPM concentration variability from the in situ measurements with those of the remote sensing data. The most important constraints of satellite images are related to the fact that satellite data is evidence of clear sky conditions, whereas in situ measurements from a vessel can be carried out also during rougher meteorological conditions and that due to the too low time resolution of the satellite images the SPM concentration peaks are often missed. It is underlined that SPM concentration measurements should be carried out during at least one tidal cycle in high turbidity areas to obtain representative values of SPM concentration. (c) 2007 Elsevier Ltd. All rights reserved.