中国近海多传感器合并叶绿素数据集检验与分析

Validation and analysis of multi-sensor merged chlorophyll datasets in offshore China

针对欧洲航天局(ESA)发布的OC-CCI和GlobColour叶绿素a数据集在中国近海的验证空白,该研究利用中国近海六个航次的现场观测资料,对1998—2020年OC-CCI以及GlobColour叶绿素a产品(包括基于加权平均的AVW产品和基于半分析模型的GSM产品)分海区进行精度检验和长期一致性分析.验证结果表明,OC-CCI数据集的叶绿素a浓度与实测值之间相关系数最高且误差最小,r达0.918,RMSE约为0.497μg·L^(-1);在长期一致性方面,OC-CCI与GlobColour AVW叶绿素a产品长期一致性高于其与GSM叶绿素a产品的一致性,且均在叶绿素a浓度较低的南海一致性较高,在渤海和黄东海,OC-CCI与GC AVW和GC GSM叶绿素a产品一致性的年际变化趋势相似,而月度变化趋势存在明显差异.

On account of the fact that OC-CCI and GlobColour chlorophyll datasets published by the European Space Agency(ESA)have not been validated in offshore China,in-situ observations from six cruises were used to conduct accuracy tests and long-term consistency analysis.The results showed that the correlation coefficient between the chlorophyll concentration in OC-CCI dataset and the measured values was the highest and the error was the lowest,with r of 0.918 and RMSE of 0.497μg·L^(-1).In terms of long-term consistency,the consistency between OC-CCI and GlobColour AVW chlorophyll products was higher than that between OC-CCI and GSM chlorophyll products.And the consistency was higher in the South China Sea where the chlorophyll concentration is relatively lower.In Bohai Sea,Yellow Sea and East China Sea,the interannual variations of consistency between OC-CCI and GC AVW/GC GSM chlorophyll products were similar,but the monthly variations were significantly different.