基于HY-1C/D卫星CZI的海洋、湖泊中漂浮藻藻华的光谱分析与识别  

Spectral analysis and identification of floating algal blooms in oceans and lakes based on HY-1C/D CZI observations

作　　者：齐琳 胡传民[1] 陆应诚[2] 马荣华[3] QI Lin;HU Chuanmin;LU Yingcheng;MA Ronghua(College of Marine Science,University of South Florida,St.Petersburg 33701,USA;International Institute for Earth System Science,Nanjing University,Nanjing 210023,China;Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 210046,China)

机构地区：[1]美国南佛罗里达大学海洋科学学院,美国圣彼得斯堡33701 [2]南京大学国际地球系统科学研究所,南京210023 [3]中国科学院南京地理与湖泊研究所,南京210046

出　　处：《遥感学报》2023年第1期157-170,共14页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家自然科学基金(编号:42076180,41806208)。

摘　　要：近年来,全球多个区域都有大量关于海洋和湖泊中漂浮藻藻华暴发的相关报道,主要包括浒苔“绿潮”、马尾藻“金潮”、夜光藻“赤潮”以及蓝藻水华等等。这些藻华的暴发不仅会给其所处的海洋、湖泊生态环境带来多方面的影响,还可能造成经济损失甚至危及人类的身体健康。HY-1C/D CZI等高分辨率新型水色传感器的发射可以提高针对漂浮藻藻华的监测能力。根据全球海洋和湖泊中主要漂浮藻藻华的种类和分布范围,本文使用HY-1C/D CZI影像数据(50 m分辨率,重访周期3 d)获取了不同区域、不同类型漂浮藻的信息,并分析了典型像元的光谱特征。基于光谱特征分析,并结合不同种类藻华暴发的环境特征,应该可以利用HY-1C/D CZI影像进行针对典型像素漂浮藻类型的区分和识别。针对中国近海出现的浒苔、马尾藻和夜光藻等“多潮齐发”的现象,CZI的这个特点对于提高精细化监测具有重要的意义。In recent years, various types of floating algal blooms have been reported in oceans and lakes around the world. These include “green tides” of Ulva, “golden tides” of Sargassum, “red tides” of Noctiluca, and cyanobacterial blooms, among others. These floating algal blooms not only represent hazards to the marine and lake ecosystems, but also cause economic losses and human health problems. The launch of new satellite ocean color sensors can improve the monitoring capability of existing satellites for floating algal blooms.to evaluate the capacity of HY-1C/D CZI sensors(50 m resolution, 3-day revisit) in detecting and differentiating various types of floating algal blooms, and to analyze the spectral characteristics of blooms of several major floating algae using CZI data. Based on the types and distributions of major floating algal blooms in the global oceans and lakes, CZI data are obtained and analyzed for their spectral characteristics from the visually identified bloom features in the CZI false-color Red-Green-Blue images. The spectral characteristics are presented from the difference spectra between the identified image features and the surrounding waters, thus minimizing the impact of atmospheric signals and water signals on the spectra. All floating algal blooms show elevated reflectance in the near infrared wavelengths. In the visible wavelength range, the spectral shapes of Ulva prolifera, Sargassum horneri, and red Noctiluca scintillas are different and therefore can be differentiated from each other. Other blooms, for example Trichodesmium blooms or Microcystis blooms, can also be differentiated once some ancillary information is available. Based on the spectral features and combined with the environmental characteristics, the multi-band Hy-1C/D CZI images are found to be able to detect and differentiate different floating algal blooms. This capacity is important for monitoring floating algal blooms in the Yellow Sea and East China Sea where “multi-tide outbreaks” of Ulva, Sargassum, a

关 键 词：卫星遥感 HY-1C/D CZI 漂浮藻 浒苔 马尾藻 夜光藻 束毛藻 蓝藻 

分 类 号：P2[天文地球—测绘科学与技术]