【作者】 潘德炉； 毛天明； 尹中林； Kiyoshi Kawasaki；

【Author】 Pan Delu,Mao Tianming ,Yin Zhonglin,Kiyoshi KawasakiSecond Institute of Oceanography, State Oceanic Administration, Hangzhou 310012Key Lab of Ocean Dynamic Processes and Satellite Oceanography, State Oceanic Administration, Hangzhou 310012National Research Institute of Fisheries Science, Japan

【机构】 国家海洋局第二海洋研究所国家海洋局动力过程和卫星海洋学重点实验室； 日本中央水产研究所；

【摘要】 由海洋水色空间卫星遥感仪器如美国Nimbus-7卫星的海岸带水色扫描仪CZCS、海洋水色卫星SeaSTAR的专门海洋宽视场的扫描仪SeaWiFS,日本的ADEOS卫星的海岸水色水温扫描仪OCTS和我国的风云1号FY-1卫星的高分辨率扫描辐射计AVRSR,从空间观察得到的资料反演成海面叶绿素浓度过程的两大关键技术:一是卫星资料的大气校正,二是反演的算法.本研究集中解决海区水体的反演算法.首先,利用历史上船测的光谱和叶绿素等资料,建立起由船测光谱反演出海面叶绿素浓度的算法.其次,通过理论计算得到在SeaWiFS卫星观察条件下大气的透过率以及到达水面的太阳照度,并把船测的光谱规范化为SeaWiFS测量条件下的离水出射率光谱,从而用SeaWiFS卫星资料反演推导副热带环流海区的叶绿素浓度反演算法.采用了1996年12月中日合作第四航次的船测资料进行了验证,用得到的算法对美国SeaWiFS二级产品中多波段的离水辐射率产品进行叶绿素浓度的反演,并制成系列的叶绿素浓度分布图用于副热带环流海区叶绿素浓度时空变化的研究.结果证明,研究得到的算法精度已相当于国际水平.虽然中日合作调查海区在1997年9月至1998年5月期间严重受到云的影响,但每个季度的卫星叶绿素浓度分布图仍足以呈现出该海区良好的时空变化,充分显示了水色遥感的作用和前景.更多还原

【Abstract】 The apace satellite program, such as CZCS/Nimbus - 7, VHRSR/FY - 1,OCTS/ADBOS and SeaWiFS/SeaStar,has been demonstrated and proved that ocean color remote sensing is a useful tool for understanding the spatial and temporal chlorophyll distribution of water surface. In general,there are two main keys in application of ocean color remote sensing data: one is the atmospheric correction and the other is inversion of radiance to chlorophyll concentration quantitatively. The algorithm of inverting the radiance measured by SeaWiFS to the chlorophyll a of water subsuface (abbereviated as chlorophyll in the following text)for subtropic circulation zone is focused on .First ,the normalized upward radiance of subsurface water measured by ship is applied to derive the chlor phyll algorithm for in situ radiometric data. Second, the irradiance arriving at water surface under SeaWiFS obeervation condition is applied to normalize the in situ radiometric data,then the normalized data are used to derive the algorithm for inversion of SeaWiFS data to the chlorophyll image.Thirdly,the accuracy of improved algorithm derived from the in situ radiometric data is evaluated by the cruise data of oceanographic survey during December 6-19,1997.Finally,the series of chlorophyll imagery are produced from Level 1-2 SeaWiFS data by the improved algorithm,and applied to analyze the spatial and temporal chlorophyll distribution.The results show that even though the cloud over severely restricts the coverage of SeaWiFS in the study area, the spatial distribution pattern and temporal variation of the water surface chlorophyll in the subtropic circulation zone are clear.更多还原