Abstract: Chlorophyll a is an important photosynthetic pigment in plant photosynthesis. Concentration of chlorophyll a in seawater is an important indicator of phytoplankton stocks, which can represent the carbon accumulation capacity of primary producers. The data of chlorophyll a concentration in seawater is always the basic data for the study of marine ecosystem research and important for the assessment of marine biological resources. The Jiaozhou bay is the model bay in the focus of marine ecological environment research in China. The phytoplankton structure of Jiaozhou bay is similar to that of the south yellow sea. The meteorological, physical, chemical, biological and other indicators in Jiaozhou bay have been monitoring for a long time by the Jiaozhou Bay National Marine Ecosystem Research Station, Shandong (the Jiaozhou Bay Station). The dataset is based on the long-term chlorophyll a observation data of 12 fixed station in the Jiaozhou bay from 1997 to 2010 by the Jiaozhou Bay Station. The original data of dataset adopts the Chinese Ecosystem Research Network of Chinese Academy of Sciences (CERN) standardized quality control system and data processing method. Data were removed which failed by 3sigma test combined with the time series comparison of adjacent sites. To meet the needs of different users, the dataset is processed after interpolation and long-time sequence diagrams are made for sharing service on line. The dataset can be used for scientific research on gulf ecological health assessment, long-term change of primary productivity, evolution of gulf ecosystem, remote sensing of water color, etc., and also provide data support for the government to set environmental quality limits effectively and prevention and control measures.
Keywords: The Jiaozhou bay; chlorophyll a; 1997–2010; long-term monitoring