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Satellite assessment of the coupling between in water suspended particulate matter and mud banks dynamics over the French Guiana coastal domain

机译：卫星评估法属圭亚那沿海地区悬浮颗粒物与泥浆动力学之间的耦合

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摘要

Particulate suspended matter concentration (SPM) were estimated over a 8 year time period (2002-2010) in the coastal waters of French Guiana from a regional algorithm applied to the MODIS monthly reflectance measurements. Comparison between SPOT images and MODIS-SPM maps revealed the strong spatio-temporal coupling between in water SPM and the dynamics of local (i.e. Kourou and Cayenne) mud banks. Highest MODIS SPM values (>13 g m~(-3) approximately) can be significantly associated with the subtidal part of the banks as well as to the related turbid plume. The migration of these mud banks induces strong interannual changes in SPM reaching up to 6% year~(-1) within increasing and decreasing patchy areas distributed alternatively along the coastline of French Guiana. Mud banks migration rates derived from MODIS SPM data reach in average about 2 km year~(-1) in agreement with previous studies. The MODIS time series have allowed for a detailed description of the seasonality and interannual variations in the in-water SPM loads. Seasonal changes in SPM are related to the onset of the trade wind season. Marked non-linear patterns including a sharp evolution in the SPM values around 2005 as well as additional high frequency modulations have been emphasized within the upward and downward SPM trend regions. Concurrent temporal variations in the frequency of northward swells (favoring mud banks migration and reworking) as well as interannual changes in the amount of sediment delivered by the Amazon River have been shown to play a major role in the SPM temporal patterns observed in the French Guiana coastal waters. Our results clearly demonstrate the advantage for ocean color data to describe mud banks dynamics through the assessment of in water SPM temporal variability.
机译：根据适用于MODIS月度反射率测量的区域算法，在法属圭亚那沿海水域的8年时间段（2002年至2010年）中估计了颗粒悬浮物浓度（SPM）。 SPOT图像和MODIS-SPM图之间的比较表明，水SPM与局部（即Kourou和Cayenne）泥浆动力学之间存在强烈的时空耦合。最高的MODIS SPM值（大约> 13 g m〜（-3））可能与堤岸的潮下部分以及相关的浑浊羽状流明显相关。这些泥浆库的迁移在法属圭亚那沿海岸线交替分布的不断增加和减少的斑块区域内引起SPM的年际变化达到6％〜（-1）。由MODIS SPM数据得出的泥浆库迁移率平均达到每年约2 km〜（-1），与先前的研究一致。 MODIS时间序列允许对水中SPM负荷的季节性和年际变化进行详细描述。 SPM的季节性变化与贸易风季节的开始有关。在向上和向下的SPM趋势区域内，已强调了明显的非线性模式，包括2005年左右SPM值的急剧变化以及其他高频调制。在法国圭亚那观测到的SPM时空模式中，北涌频率的同时性时空变化（有利于泥浆库迁移和返工）以及亚马逊河输沙量的年际变化起着重要作用。沿海水域。我们的结果清楚地表明，通过评估水中SPM的时间变异性，海洋颜色数据可以描述泥浆动力学，具有优势。

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  • 来源
    《Journal of South American earth sciences》 |2013年第7期|25-34|共10页
  • 作者

    V. Vantrepotte; E. Gensac; H. Loisel; A. Gardel; D. Dessailly; X. Meriaux;

  • 作者单位

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

    INSU-CNRS, UMR 8187, LOG, Laboratoire d'Oceanologie et des Geosciences, Universite Lille Nord de France, ULCO, 32 avenue Foch, 62930 Wimereux, France;

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  • 正文语种 eng
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  • 关键词

    Suspended matter; Mud banks; Ocean color; MODIS; French Guiana;

    机译：悬浮物;泥浆库;海洋颜色;MODIS;法属圭亚那;

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