Validation of MERIS ocean-color products in the Bohai Sea: A case study for turbid coastal waters
Validation of MERIS ocean-color products in the Bohai Sea: A case study for turbid coastal waters
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MERIS 海洋色产品在渤海的验证：以浑浊的沿海水域为例
DOI：
10.1016/j.rse.2010.05.009
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发表时间：
2010-10-15
影响因子：
13.5
通讯作者：
Sathyendranath, Shubha
中科院分区：
文献类型：
--
作者：
Cui, Tingwei;Zhang, Jie;Sathyendranath, Shubha
利用中分辨率成像光谱仪（MERIS）在渤海海域采集了大量的海洋组分辐射测量数据，对海洋组分的辐射特性和浓度进行了评估。收集的数据包括光谱归一化的离水辐射L-wn（λ）和悬浮颗粒物（SPM）和叶绿素a（Chl-a）的浓度。考虑到浑浊海岸带的复杂性和多变性，采用了严格的时空匹配方法，MERIS L-wn（lambda），SPM和Chl-a估计值分别为13，48和18个匹配。对于MERIS L-wn（lambda），匹配显示412、443、620和665 nm波段的平均绝对百分比差异（APD）为17%-20%，而L-wn（lambda）在490和560 nm波段的APD更好，为15- 16%。卫星数据的L-wn（490）与L-wn（560）的波段比与现场观测的APD为4%的情况吻合得很好。MERIS SPM和Chl-a产品高估了原位值，APD分别约为50%和60%。当匹配标准放宽时，评估结果系统地下降。因此，在浑浊的沿海地区，生物光学特性的时间变异性和空间异质性可能是明显的陆地影响和本地动态的结果，严格的时空匹配的建议。(C)2010年爱思唯尔公司All rights reserved.
An extensive in situ data set in the Bohai Sea of China was collected to assess radiometric properties and concentrations of ocean constituents derived from Medium Resolution Imaging Spectrometer (MERIS). The data collected include spectral normalized water-leaving radiance L-wn(lambda) and concentrations of suspended particulate matter-(SPM) and chlorophyll a (Chl-a). A strict spatio-temporal match-up method was adopted in view of the complexity and variability of the turbid coastal area, resulting in 13, 48 and 18 match-ups for MERIS L-wn(lambda), SPM and Chl-a estimates, respectively. For MERIS L-wn(lambda), the match-ups showed mean absolute percentage differences (APD) of 17%-20% in the 412, 443, 620 and 665 nm bands, whereas L-wn(lambda) at bands from 490 and 560 nm had better APD of 15-16%. The band ratio of L-wn(490) to L-wn(560) of the satellite data was in good agreement with in situ observations with an APD of 4%. MERIS SPM and Chl-a products overestimated the in situ values, with the APD of approximately 50% and 60%, respectively. When match-up criteria were relaxed, the assessment results degraded systematically. Hence, in turbid coastal areas where temporal variability and spatial heterogeneity of bio-optical properties may be pronounced as the result of terrestrial influences and local dynamics, the strict spatio-temporal match-up is recommended. (C) 2010 Elsevier Inc. All rights reserved.