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用辐射传输方程改进算法反演LandSAT8海表温度的效果检验和适用条件分析
黄路,邵浩,张彩云,夏文杰,杨星晨
0
(国家海洋技术中心漳州基地筹建办公室, 福建 厦门 361007;厦门大学海洋与地球学院, 福建 厦门 361102;91039部队, 北京 102401;声场声信息国家重点实验室、中国科学院声学研究所, 北京 100190)
摘要:
为检验辐射传输方程改进算法推广用于反演LandSAT8 海表温度(SST)的可行性及适用条件,本研究在修订算法部分参数的基础上,分别反演出算法改进前后的LandSAT8 SST并进行比较。MODIS SST验证表明改进算法对大气透过率偏差和SST偏差均有明显改善,除2019-08-21图像外,其他3景图像SST偏差在0.5℃左右;浮标SST验证表明改进算法在近岸海域对SST偏差改善效果同样显著,其平均偏差bias和均方根误差rmse分别减少到0.14、0.18℃,基本可以忽略不计;进一步研究发现,改进算法SST反演精度与研究海域大气透过率分布均匀程度呈显著的正相关关系,R2[bias(SST)]=0.920 7,R2[rmse(SST)]=0.934 0。使用改进算法遥感监测电厂温排水:嵩屿电厂表层海水温升羽流不明显;而后石电厂表层温升现象最显著,温升幅度和扩散影响范围最大,在其排水口附近存在稳定的高温水体(温升>3℃);晋江电厂表层温升羽流呈扇形分布,流轴短,主要集中在排水口附近。
关键词:  海洋遥感学  辐射传输方程改进算法;LandSAT8 SST;MODIS SST;大气透过率;温排水
DOI:10.3969/J.ISSN.2095-4972.2021.04.019
基金项目:国家重点研发计划资助项目(2016YFE0202100); 国家自然科学基金重点资助项目(U1805241)
Accuracy assessment and applicable condition analysis for applying Improved Radiative Transfer Equation Algorithm to retrieve LandSAT8 sea surface temperature
HUANG Lu,SHAO Hao,ZHANG Caiyun,XIA Wenjie,YANG Xingchen
(Preparatory Office of Zhangzhou Base, National Ocean Technology Center, Xiamen 361007, China; College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China;Unit No. 91039 of PLA, Beijing 102401, China; State Key Laboratory of Sound Field and Sound Information, Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China)
Abstract:
To verify the feasibility and applicable conditions of extending the Improved Radiative Transfer Equation Algorithm the differences of LandSAT8 SST parameters retrieved by Unimproved Algorithm and Improved Algorithm are compared, in this paper respectively. MODIS SST validation shows that the Improved Algorithm has significantly improved the atmospheric transmittance deviation and SST deviation except for the 2019-08-21 image while the SST deviation of the other three images is around 0.5 ℃. Buoy SST validation shows that the Improved Algorithm also has significant improvement effect on SST deviation in the nearshore sea, its bias and rmse are reduced to 0.14 ℃ and 0.18 ℃, respectively. Further research find that the SST retrieval accuracy of Improved Algorithm has a significant positive correlation R2[bias(SST)]=0.920 7, R2[rmse(SST)]=0.934 0 with the uniformity of atmospheric transmittance distribution in the study area. Using the Improved Algorithm to monitor the thermal discharge of the power plants, the surface temperature rise plume of Songyu Power Plant is not obvious. However, the surface temperature rise of Houshi Power Plant is the most significant in that it has the largest temperature rise amplitude and diffusion range, as well as the presence of a stable high temperature (>3 ℃) water body near its outlet. The surface temperature rise plume of Jinjiang Power Plant is a fan-shape distribution with a short flow axis and mainly concentrated near the outlet.
Key words:  marine remote sensing  Improved Radiative Transfer Equation Algorithm  LandSAT8 SST  MODIS SST  atmospheric transmittance  thermal discharge

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