基于空间自相关分析方法的渤海湾赤潮遥感叶绿素浓度研究  

Study on the remote sensing chlorophyll concentration of red tide in the Bohai Bay based on spatial autocorrelation analysis methods

作　　者：向先全[1,2] 路文海[1,3] 许艳[1] 曾容[1] 陶建华[2] 

机构地区：[1]国家海洋信息中心,天津300171 [2]天津大学环境科学与工程学院,天津300072 [3]中国海洋大学信息学院,山东青岛266100

出　　处：《海洋通报》2015年第3期344-352,共9页Marine Science Bulletin

基　　金：海洋公益性行业科研专项(201405007);天津市科技兴海项目(KJXH2012-28)

摘　　要：引入地学统计学中的空间数据分析方法,利用探索性分析、全局空间自相关和局部空间自相关分析对渤海湾赤潮爆发前后的遥感叶绿素浓度数据进行了研究。结果表明,渤海湾叶绿素浓度在相邻空间位置上具有高度的正空间自相关性;赤潮前渤海湾叶绿素浓度整体较低,但局部地区的叶绿素浓度表现出较大的上升随后几天又出现下降的异常现象;叶绿素浓度的全局空间自相关指数Moran's I值在赤潮爆发前变化幅度不大,在赤潮期间表现出一些不规则的异常变化;局部Moran's I的高-高型聚集在赤潮前主要分布在渤海湾南半部,赤潮期间出现分散并逐步转移到离岸区域,赤潮后期聚集在近岸区域。分析了其中的一些变化特征及异常情况,这些异常现象有可能是赤潮发生的预兆性信号,可为赤潮预报与应急提供一种新的尝试性模式。In this paper, space data analysis methods of geo-statistics were introduced, and through the exploratory analysis, global spatial autocorrelation, and local spatial autocorrelation analysis, the remote sensing chlorophyll concentration of red tide in the Bohai Bay were studied during pre-bloom, bloom and post consequences of the bloom. The results showed that：a） chlorophyll concentration in the Bohai Bay had a high positive spatial autocorrelation with adjacent spaces; b）chlorophyll concentrations in the Bohai Bay was relatively low during pre-bloom, but the chlorophyll concentration in some areas showed the abnormal phenomenon, i.e. a greater rise at the beginning and a decline phenomenon in the next few days;c）global spa-tial autocorrelation index Moran＇s Ⅰ value of chlorophyll concentration changed slightly before the outbreak of the red tide, and some irregular abnormal changes appeared during the red tide period;d）local Moran＇s Ⅰ high- high type gathered was mainly distributed in the southern half of the Bohai Bay during pre-bloom, dispersed and gradually transferred to the offshore area during bloom, and gathered in the coastal area during post consequences of the bloom. In this paper, some characteristics of the abnormal situation were analyzed. These abnormal phenomena are likely to be the harbinger signal of the red tide oc-currence, which will provide a new attempt model for the prediction of red tide and emergency.

关 键 词：空间自相关分析 赤潮 遥感叶绿素浓度 探索性分析 渤海湾 

分 类 号：P76[天文地球—海洋科学] X171[环境科学与工程—环境科学]