Satellite remote sensing of ultraviolet irradiance on the ocean surface

1.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China
2.
State Key Laboratory of Satellite Ocean Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;Institute of Remote Sensing and Earth Science, Hangzhou Normal University, Hangzhou 311121, China
3.
Key Laboratory of Tropical Marine Bio-resources and Ecology, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou 510301, China
4.
Institute of Marine Geology and Chemistry, College of Marine Sciences, National Sun Yat-Sen University, Kaohsiung 80424, Taiwan, China
5.
State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361005, China
6.
Institute of Remote Sensing and Earth Science, Hangzhou Normal University, Hangzhou 311121, China

摘要

摘要: 紫外辐射(Ultraviolet radiation, UVR)对海洋生物活动和海洋初级生产力有重要影响。而现有的海洋水色传感器还没有包含紫外辐射探测波段。通过海气耦合辐射传输模型(COART)建立了海表紫外辐射波段积分(280-400nm)辐照度查找表, 在此基础上,利用Aqua卫星反演的大气遥感产品(气溶胶550nm光学厚度、臭氧浓度、液态云水路程及总可降水量)和计算得到的太阳天顶角反演得到中低纬度海表紫外辐射辐照度时空分布。与实测数据的验证结果表明,10天滑动平均的卫星过境时刻和一天积分紫外辐射剂量的遥感反演及实测结果的平均相对偏差分别为8.20%和 13.95%;30天滑动平均的卫星过境时刻和一天积分紫外辐射剂量的遥感反演及实测结果之间存在较好的相关性,其平均相对偏差分别为6.87%和8.43%。敏感性分析表明,代表云信息的液态云水路程对反演结果的影响最大,臭氧和气溶胶的影响相对较弱,总可降水量对反演结果的影响不显著。在反演得到海表紫外辐射强度的基础上,结合海洋初级生产力遥感反演模型,简单评估了紫外辐射对海洋初级生产力的影响。结果显示,紫外辐射对海洋初级生产力估算的影响是不容忽视的。
- 紫外辐射 /
- 遥感 /
- 辐射传输 /
- 海洋初级生产力
Abstract: Ultraviolet (UV) radiation has a significant influence on marine biological processes and primary productivity; however, the existing ocean color satellite sensors seldom contain UV bands. A look-up table of wavelengthintegrated UV irradiance (280-400 nm) on the sea surface is established using the coupled ocean atmosphere radiative transfer (COART) model. On the basis of the look-up table, the distributions of the UV irradiance at middle and low latitudes are inversed by using the satellite-derived atmospheric products from the Aqua satellite, including aerosol optical thickness at 550 nm, ozone content, liquid water path, and the total precipitable water. The validation results show that the mean relative difference of the 10 d rolling averaged UV irradiance between the satellite retrieval and field observations is 8.20% at the time of satellite passing and 13.95% for the daily dose of UV. The monthly-averaged UV irradiance and daily dose of UV retrieved by satellite data show a good correlation with the in situ data, with mean relative differences of 6.87% and 8.43%, respectively. The sensitivity analysis of satellite inputs is conducted. The liquid water path representing the condition of cloud has the highest effect on the retrieval of the UV irradiance, while ozone and aerosol have relatively lesser effect. The influence of the total precipitable water is not significant. On the basis of the satellite-derived UV irradiance on the sea surface, a preliminary simple estimation of ultraviolet radiation's effects on the global marine primary productivity is presented, and the results reveal that ultraviolet radiation has a non-negligible effect on the estimation of the marine primary productivity.
- ultraviolet radiation /
- remote sensing /
- radiative transfer /
- marine primary productivity

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基于遥感的海表紫外辐射强度反演方法

doi: 10.1007/s13131-015-0690-z

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Satellite remote sensing of ultraviolet irradiance on the ocean surface

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