An algorithm to retrieve absorption coefficient of chromophoric dissolved organic matter from ocean color

An algorithm to retrieve absorption coefficient of chromophoric dissolved organic matter from ocean color
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从海洋颜色反演发色溶解有机物吸收系数的算法

DOI:
10.1016/j.rse.2012.10.013
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发表时间:
2013-01
影响因子:
13.5
通讯作者:
Zhongping Lee
Zhongping Lee
中科院分区:
工程技术1区
文献类型:
--
作者:
Qiang Dong;Shaoling Shang;Zhongping Lee

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我们扩展了准解析算法(QAA)架构,解析推导出的吸收系数的发色溶解有机物(ag)。具体来说,我们使用基于总吸收和颗粒后向散射系数的经验公式来估计并去除碎屑吸收系数(ad),并开发了使用三个波长(412、443和490 nm)的吸收系数来分离agand aph(浮游植物吸收系数)的方案。利用在南海和台湾海峡收集的原位数据集和全球原位数据集-美国宇航局生物光学海洋算法数据集(NOMAD)的算法进行了测试。结果表明,该算法对ag(412)的平均绝对百分误差约为45%,对近海和大洋沃茨的平均绝对百分误差也较好。最后,以台湾海峡和密西西比河三角洲附近陆架区的MODIS数据为例,简要说明了该算法在一般海洋学研究中的适用性。然而,还需要对现场和卫星数据进行更多的独立测试,以进一步验证和改进这一创新方法。
We extended the quasi-analytical algorithm (QAA) architecture to analytically derive absorption coefficient of chromophoric dissolved organic matter (ag). Specifically, we used an empirical formula based on total absorption and particle backscattering coefficients to estimate and then remove detritus absorption coefficient (ad), and developed a scheme to use absorption coefficients at three wavelengths (412, 443, and 490nm) for the separation of agand aph(absorption coefficient of phytoplankton). The algorithm was tested using an in situ data set collected in the South China Sea and the Taiwan Strait and a global in situ data set—the NASA Bio-Optical Marine Algorithm Data set (NOMAD). Our results indicated that this new analytical algorithm for retrieving agperformed reasonably well with a mean absolute percentage error of approximately 45% for ag(412), while it also presented a satisfactory performance for aphand adin both coastal and oceanic waters. Furthermore, the applicability of this new algorithm for general oceanographic studies was briefly illustrated by applying it to MODIS measurements over the Taiwan Strait and the shelf region near the Mississippi River delta. Nevertheless, more independent tests with in situ and satellite data are needed to further validate and improve this innovative approach.
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