渤海海域表层叶绿素A浓度的分布特征  

Distribution Characteristics of Surface Chlorophyll-A Concentrations in the Bohai Sea

作　　者：钱莉[1] 刘文岭[1] 李伟[1] 郑小慎[1] 

机构地区：[1]天津市海洋资源和化学重点实验室天津科技大学海洋科学与工程学院,天津300457

出　　处：《盐业与化工》2010年第5期20-24,共5页Jounral of Salt and Chemical Industry

基　　金：天津市自然科学基金重点资助项目(09JCZDJC25400)

摘　　要：文章应用宽视场扫描仪SeaWiFS卫星数据获得叶绿素浓度分析其在渤海海域的分布特征,数据时间范围为1998年到2009年跨度12 a。采用经验正交函数(EOF)方法分析叶绿素A时空分布特征;离散功率谱方法分析第1模态的显著性变化周期,处理过程用IDL编程语言实现。实验结果表明;叶绿素A浓度12 a均值空间分布从渤海近岸往渤海中部,叶绿素A浓度呈明显下降趋势,并且最小值位于渤海海峡及北黄海口;叶绿素A浓度的季节性变化表明夏季较低,其余季节较高;EOF的第1模态和第2模态分别占总方差贡献率的22%和11%;95%置信限的离散功率谱分析模态1的时间序列,表明其有10月-12月的显著性变化周期。Chlorophyll concentrations data used in this paper are derived from Sea- view Wide Field -of- View Senor（SeaWiFS） spanning 12 years from 1998 to 2009 in Bohai Sea. Em- pirical orthogonal function（EOF） is used to analyze the spatial - temporal distribution characteris-tics. Discrete power spectral density （PSD） is used to analyze the marked variation periods of the first mode of EOF, which explains 22% of the variation. All the procedures are processed in IDL. The results show that the spatial distribution is characterized by decreasing from coastal - shore to off- shore and the minimum values are located in Bohai Strait and Northern Yellow Sea. The sea- sonal variations show lowest concentration is in summer and higher concentration in other seasons. The mode 1 and mode 2 of EOF explain 22% and 11% of the variance, respectively. The PSD with 95% confidence limit of time series for mode 1 shows it has 10 - 12 months＇ periods.

关 键 词：渤海SeaWiFS 经验正交函数(EOF) 叶绿素A 离散功率谱 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]