Spatial-temporal variation of Chlorophyll-a concentration based on Moderate Resolution Imaging Spectroradiometer (MODIS-Auqa, aboard Auqa satellite) was analyzed since the starting of MODIS-Auqa mission in July 2002 till December 2009. Statistical methods including anomaly, sliding average, power spectral density were used to analyze the spatial-temporal variation of Chlorophyll-a concentration in the Bohai Sea. Seasonal variation of Chlorophyll-a concentration represented the maximum values in February-March, the minimum values in July. Spatial variation showed the high concentration of Chlorophyll-a in coastal shore and decreased to offshore and the minimum values lay in Bohai strait and northern Huanghai Sea. The monthly anomalies showed about 4-year and 2-year cycle. In 2006, the whole Bohai Sea showed high Chlorophyll-a concentration from 2003 to 2008.%采用离散时间功率谱、距平、滑动平均等统计学方法分析了MODIS反演得到的渤海海域2002-2009年叶绿素浓度的时空变化特征.结果表明,叶绿素浓度多年月平均值的波峰出现在2-3月份,波谷在7月份.叶绿素多年平均值近海明显高于外海,由近海往外递降,最低值出现在渤海海峡和北黄海口附近.通过对叶绿索浓度多年月距平值进行离散时间功率谱的分析并进行F检验,能通过95％显著性检验有7.5年和2.5年两个显著性变化周期.2003-2009年间叶绿索浓度差值图像的空间分布表明,2006年整个渤海海域叶绿素浓度高于7年均值.
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