南黄海有色可溶有机物日变化分析

摘要

用高时间分辨率的韩国静止海洋水色仪(GOCI)影像,分析了2015年10月2日及2016年9月22日南黄海有色可溶有机物(CDOM)的时空分布特征及影响因素.结果表明,南黄海近岸CDOM浓度高于中央海域,江苏沿岸含量最高;近岸水体以陆源输入为主,远岸水体以微生物现场生产为主.结合叶绿素(chl-a)浓度采样数据分析发现,CDOM日变化时间、空间特征与chl-a日变化一致,回归分析的R2高于0.88,验证了二者时空变化的正相关关系.在深水区,CDOM随悬浮物浓度增加而增加,且线性趋势明显.与提取的潮汐、潮流数据的对比分析发现,潮流是近岸水体(山东半岛南岸与江苏沿岸)表层CDOM变化的主要动力因素.%The temporal-spatial distribution of the colored dissolved organic matter ( CDOM) and the influencing factors to it in the South Yellow Sea on October 2 ,2015 and September 22 ,2016 were analyzed based on the high temporal resolution images of Geostationary Ocean Color Imager ( GOCI) .The analyzing results indicate that the CDOM con-centration in the nearshore area is higher than that of the central area of the sea , and the maximum value is located in the coastal area of Jiangsu Province .The nearshore water is dominated by terrestrial input , while offshore water is mainly dominated by microbial production .Given the existence of oceanic fronts , the boundary between areas with high value and low value range is obvious .The temporal and spatial characters of CDOM are found to coincide with that of chlorophyll-a.The regression analysis shows that the fitting coefficient is higher than 0.88, which veri-fies the positive correlation between CDOM and chlorophyll-a.In deep water , CDOM increases with total suspended matter, of which the linear trend is significant .A contrastive analysis of tide and tidal current finds that tide-driven sub-surface water substance changes little on surface CDOM .Tidal current is a main dynamic factor of CDOM varia-tion in coastal waters ( Shandong peninsula south coast and Jiangsu coast ) .