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渤海叶绿素浓度时空特征分析及其对赤潮的监测
姜德娟, 张 华
中国科学院 海岸带环境过程与生态修复重点实验室, 中国科学院 烟台海岸带研究所
摘要:
基于2014~2015年MODIS数据分析了渤海表层水体叶绿素浓度的时空特征, 并对赤潮进行了遥感监测。结果表明, 5~10月, 渤海表层叶绿素浓度总体较高, 其中在5月份达到峰值; 空间上, 叶绿素浓度由近岸向渤海中部递减, 其中秦皇岛附近海域、莱州湾、渤海湾、辽东湾叶绿素浓度相对较高。基于16mg/m3的叶绿素浓度阈值和ERGB影像, 成功提取了渤海赤潮信息。秦皇岛附近海域是渤海赤潮的频发区和重灾区, 赤潮发生于5月份, 其分布范围在5月下旬达到最大。渤海赤潮分布与底部两个低氧区位置吻合, 说明赤潮爆发可能对低氧区的形成和发展起重要作用。
关键词:  叶绿素浓度  时空特征  赤潮  渤海
DOI:10.11759/hykx20171215001
分类号:
基金项目:中国科学院战略性先导科技专项(XDA11020305); 中国科学院重点部署项目(KZZD-EW-14)
Analysis of spatial and temporal characteristics of chlorophyll-a concentration and red tide monitoring in Bohai Sea
JIANG De-juan, ZHANG Hua
Abstract:
Affected by intense human activities, Bohai Sea, the largest inland sea of China, has being suffered from serious water pollution, e.g., exacerbated water eutrophication, frequent red tide outbreaks, causing major damages to marine ecology/environment, public health, and economy. Based on MODIS data during 2014-2015, the spatial and temporal characteristics of surface layer chlorophyll-a concentration has been analyzed and then, the red tide has been monitored for Bohai Sea. The results showed that surface layer chlorophyll-a concentration was overall higher from May to October, which reached its peak in May. Spatially, chlorophyll-a concentration decreased from the coastal area to the offshore, which was higher in Qinhuangdao offshore area, Laizhou Bay, Bohai Bay and Liaodong Bay. According to the chlorophyll-a concentration threshold of 16 mg/m3 and ERGB composite, the red tide information has been successfully extracted. In the Qinhuangdao offshore area with the frequent occurrence and worst-hit area of red tide in Bohai Sea, red tide happened in May and its dispersion area reached its maximum in late May. The distribution of red tide agreed with the location of two bottom hypoxia zones in Bohai sea, suggesting that red tide outbreaks may play an important role in the formation and development of bottom hypoxia zone. The results for this study will provide scientific foundation for the red tide prediction and control of Bohai Sea.
Key words:  Chlorophyll-a concentration  spatial and temporal characteristics  red tide  Bohai Sea
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