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引用本文:陶蓉茵,赵巧华,孙德勇,邱辉,钱昊钟,姜雨薇,季春华.太阳天顶角对太湖恰在水面下辐照度比影响的定量分析.湖泊科学,2012,24(1):161-168. DOI:10.18307/2012.0123
TAO Rongyin,ZHAO Qiaohua,SUN Deyong,QIU Hui,QIAN Haozhong,JIANG Yuwei,JI Chunhua.Influence of the solar zenith angle on the irradiance reflectance just beneath the water surface in Lake Taihu. J. Lake Sci.2012,24(1):161-168. DOI:10.18307/2012.0123
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太阳天顶角对太湖恰在水面下辐照度比影响的定量分析
陶蓉茵1, 赵巧华1, 孙德勇1, 邱辉2, 钱昊钟2, 姜雨薇1, 季春华1
1.南京信息工程大学遥感学院, 南京 210044;2.南京信息工程大学大气科学学院, 南京 210044
摘要:
恰在水面下辐照度比变化与吸收系数、散射系数和太阳天顶角存在着密切的关系,而太阳天顶角对太湖恰在水面下辐照度比的定量影响程度尚不明确.为此,本文基于2010年5月太湖27个样点的水体光学参数和理论数值模拟,对太湖水体的情况进行研究.理论数值模拟结果表明:当太阳天顶角分别在0°~25°和70°~89°区间内变化时,对恰在水面下辐照度比增幅影响较小,增幅相差不到10%;而当太阳天顶角在30°~70°之间时,对辐照度比增幅影响很大,增幅为13.13%~52.19%.同时,利用实测数据对理论结果进行线性相关验证表明,此数值研究整体上符合太湖的实际情况.因此,对水体光学特性以及光对水生生态系统驱动作用研究的时候,应充分考虑太阳天顶角的影响.
关键词:  辐照度比  吸收系数  散射系数  太阳天顶角  太湖
DOI:10.18307/2012.0123
分类号:
基金项目:国家自然科学基金项目(41071070);国家水体污染控制与治理科技重大专项项目(2009ZX07101-013)联合资助
Influence of the solar zenith angle on the irradiance reflectance just beneath the water surface in Lake Taihu
TAO Rongyin1, ZHAO Qiaohua1, SUN Deyong1, QIU Hui2, QIAN Haozhong2, JIANG Yuwei1, JI Chunhua1
1.College of Remote Sensing, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China;2.College of Atmospheric Science, Nanjing University of Information Science and Technology, Nanjing 210044, P. R. China
Abstract:
The irradiance reflectance just beneath the water surface is closely related to the absorption coefficient, scattering coefficient and solar zenith angle. However, the effect of solar zenith angle on the irradiance reflectance just beneath the water surface is not clear in Lake Taihu. The influence factors of irradiance reflectance just beneath the water surface in Lake Taihu were analyzed based on the optical parameters and numerical simulates using the data of total 27 sampling sites measured in May, 2010. The results show that while solar zenith angle is in the range of 0°-25ånd 70°-89°, it has little influence on the growth of irradiance reflectance just beneath the water surface which is less than 10%. While solar zenith angle is in the range of 30°-70°, the growth of irradiance reflectance is 13.13%-52.19%. The correlation of theoretical results and measured data show that such numerical study is correct for Lake Taihu. Therefore, full consideration should be given to the effect of solar zenith angle when studying on the optical properties of water and the driving mechanism of the light to aquatic ecosystems.
Key words:  Irradiance reflectance  absorption coefficient  scattering coefficient  solar zenith angle  Lake Taihu
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