摘要
呼伦湖是我国内陆高纬度半干旱地区的第一大草原型湖泊,对于草原生产和草原–湖泊生态系统维持具有重要意义。水体固有光学量(InherentOptical Properties,IOPs)是指仅由水体本身的光学特性决定,而与周围环境光场无关的量,包括吸收系数(a)、散射系数(b)、后向散射系数(bbp)、衰减系数(c)等参数,有助于估计水体的光学活性物质等相关水体及水环境参数。本文基于从准分析算法(quasi-analytical algorithm,QAA)发展来的适用于内陆水体的QAA-750E吸收系数反演算法,以Sentinel-3/OLCI Level-1B数据为基础,生产了2016–2020年间呼伦湖的浮游植物吸收系数aph(675)和后向散射系数bbp(560)数据产品。利用实测数据对产品进行了验证分析(N=15),得到bbp(560)的相关系数为0.59,均方根误差为0.55,平均相对误差为0.54,验证结果表明产品具有一定的可靠性,可为呼伦湖的水质监测和生态环境保护等研究工作提供数据支持。
Hulun Lake,the largest steppe lake in the high latitude semi-arid region of inland China,holds great significance for grassland production and steppe-lake ecosystem.The absorption coefficient of water constitutes is indicative of the optically active components in water,thus conducive to estimating the optically active substances and other related bio-optical parameters of waters.In this study,we used the quasianalytical algorithm(QAA),a QAA-750E absorption coefficient inversion algorithm suitable for inland waters.Based on Sentinel-3/OLCI remote sensing reflectance data,we produced a dataset of monthly mean phytoplankton absorption coefficient aph(675)and backscattering coefficient bbp(560)of Hulun Lake during 2016-2020.Validation analysis results show that the model-derived b_bp(560)has an R2 value of 0.59,RMSE of 0.55,and MRD of 0.54(N=15),indicating a high level of reliability of the dataset.The dataset is expected to offer data support for water quality monitoring and ecological environment protection of Hulun Lake.
作者
隗晓琪
许金朵
黄泽晖
李含含
马荣华
WEI Xiaoqi;XU Jinduo;HUANG Zehui;LI Hanhan;MA Ronghua(State Key Laboratory of Lake Science and Environment,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210008,P.R.China;University of Chinese Academy of Science,Nanjing 210008,P.R.China;Lake-Watershed Science Data Center,National Earth System Science Data Center,Beijing 100049,P.R.China;School of Remote Sensing and Geomatics Engineering,Nanjing University of Information Science and Technology,Nanjing 210044,P.R.China;Collaborative Innovation Center for Grassland Ecological Security(Jointly Supported by the Ministry of Education of China and Inner Mongolia Autonomous Region),Hohhot 010021,P.R China)
基金
全球变化背景下中国区域湖泊响应数据库(CAS-WX2021SF-0306)
中国科学院网络安全和信息化专项(CAS-WX2022SDC-SJ05)
中国科学院STS项目(KFJ-STS-QYZD-2021-01-002)
内蒙古自治区科技成果转化专项资金项目(2021CG0013)。
关键词
呼伦湖
固有光学参数
吸收系数
后向散射系数
Hulun Lake
inherent optical properties
absorption coefficient of phytoplankton
backscattering coefficient
