珠江口海域<em>a</em><sub>g</sub>(440)遥感模式研究及应用

黄妙芬; 王迪峰; 邢旭峰; 韦济安; 刘东; 赵祖龙; 王伟轩; 刘阳

珠江口海域a_g(440)遥感模式研究及应用

1.
大连海洋大学海洋科技与环境学院, 辽宁大连 116023
2.
国家海洋局第二海洋研究所国家海洋局海洋动力过程与卫星海洋学实验室, 浙江杭州 310012

基金项目: 国家科技支撑计划项目——粤港澳水量与水环境遥感监测应用系统(2012BAH32B01-4);国家自然科学基金项目——石油类污染水体固有光学特性研究与反演(41271364);国家海洋公益性行业科研专项——海洋生态环境监测仪器产业化及示范应用研究(201005025-04).

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- 收稿日期: 2014-07-20
- 修回日期: 2014-12-22

The research on remote sensing mode of retrieving a_g(440) in Zhujiang River Estuary and its application

1.
School of Marine Engineering, Dalian Ocean University, Dalian 116023, China
2.
The Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

摘要

摘要: 有色可溶性有机物质(Coloured Dissolved Organic Matter,CDOM)直接影响着海水的光学性质,为水体有机污染物含量遥感反演的基础参数之一.在水色遥感研究领域,一般用440 nm波长位置的吸收系数a_g(440)来表示其浓度,因而建立a_g(440)遥感反演模式,对于掌握相关海域CDOM浓度的空间变化规律及进一步提取其他水环境参数具有重要的作用.利用2013年11月和2014年2月两个航次在珠江口海域现场采集的表观光学量及固有光学量数据,建立了基于HJ-1/CCD卫星传感器的a_g(440)遥感反演模型,并应用于珠江口海域,得到该区域2012年1月至2014年6月晴天CDOM浓度空间动态分布图.研究结果表明:(1)现场测定的珠江口海域a_g(440)在0.1~0.3 m^-1,且不同断面a_g(440)呈现出一定的规律性变化;(2)利用现场实测数据对遥感模式估算值进行验证,计算出估算值的相对误差为9%,表明所建立模式具有较高的准确率;(3)遥感反演的CDOM空间分布数据与实测数据得到的分布特征基本吻合,整个珠江口及其邻近海域a_g(440)的数值范围为0.07~0.31 m^-1,而且珠江口西部海域a_g(440)高于中部和东部海域.
- 珠江口海域 /
- CDOM /
- a_g(440) /
- 遥感模式
Abstract: Colored dissolved organic matters(CDOM) directly affect the optical characteristics of sea water. As one of the fundamental parameters of inverse modeling the water organic pollution content water color remote sensing,the concentration of CDOM in the water is usually indexed by the absorption coefficeient at 440 nm wavelength,a_g(440). Therefore,in order to obtain the spatial variability of the CDOM concentration in the relevant areas and to extract other water environmental paramenters,it is essential to establish a remote sensing inverse model of a_g(440). Applying the in-site measured apparent and inherent optical properties of Zhujiang River Estuary of southern China in November 2013 and February 2014,respectively,we established a remote sensing inverse model of a_g(440) based on the HJ-1/CCD satellite. The model is then applied to Zhujiang River Estuary to obtain the spatial distribution of CDOM concentration under the clear sky between January 2012 and June 2014. The results that,(1) the in-situ measured a_g(440) in Zhujiang River Estuary varied between 0.1 and 0.3 m^-1,the value is obviously larger in the areas with high influence of land and river runoff than those with low influence of land and river runoff. It also shows some regular variation with differene sections; (2) the validation of the model by the in-situ data givers a relative error of 9%,indicating a high accuracy of the inverse model; (3) the CDOM spatial distribution data from the inverse model are in good agreement with the observation,in the whole Zhujiang River Estuary and the adjacent areas,a_g(440) varies between 0.07 and 0.31 m^-1,and the value is higher in the western part of the estuary than the eastern part.
- Zhujiang River Estuary /
- CDOM /
- a_g(440) /
- remote senseing

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珠江口海域a_g(440)遥感模式研究及应用

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The research on remote sensing mode of retrieving a_g(440) in Zhujiang River Estuary and its application

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The research on remote sensing mode of retrieving ag(440) in Zhujiang River Estuary and its application

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珠江口海域a_g(440)遥感模式研究及应用

The research on remote sensing mode of retrieving a_g(440) in Zhujiang River Estuary and its application