在近海富营养化和全球气候变化的大背景下，黄渤海浮游植物生物量的时空变化规律及影响机制是热点。目前，黄渤海浮游植物生物量研究多聚焦于其叶绿素a浓度量值的变化，而对其生长季的变化研究鲜见涉及。近几年，物候期作为反映生物生长季变化的有效指标，被成功引入到海洋浮游植物时空变化规律及其对气候变化的响应研究中，为海洋浮游植物生长季变化研究提供了新的方法和理论依据。本项目拟利用近20年（1997-2016）叶绿素a浓度遥感数据库，分析黄渤海浮游植物各物候特征指标（年内生长季数量、生长季始期、峰值期、生长季终期和生长季持续时间）的多尺度时空变化规律，并结合水深、温度、风场等海洋环境数据及全球性的气候变化事件，探索浮游植物物候变化对海洋环境变化的响应机制。项目的研究结果，能够加深人们对于黄渤海浮游植浮游植物生物量时空变化规律的认识，对揭示浮游植物长期变化及对气候变化的响应机制提供新的理论依据。

The spatial and temporal pattern of chlorophyll-a concentration is widely concerned topic in Bohai and Yellow Seas (BYS), with the background of coastal eutrophication and global climate change. At present, many studies in phytoplankton biomass in BYS have examined the changes in magnitude of chlorophyll-a concentration, but little has been done to examine the change in the timing of the growing period of phytoplankton biomass. In recent years, phytoplankton phenology has been successfully proposed as a significant indicator to monitor the variability of marine phytoplankton and detect its response to changes of environmental conditions. Many effective methods and theoretical foundations have been provided from the previous successful studies over global and regional scales. In this project, we proposed to extract the typical metrics of phytoplankton phenology (number of growing period, timing of initiation, timing of peak, timing of termination, and duration of growing period) over the BYS from the remotely sensed chlorophyll-a data (1997-2016), and describe the temporal change and geographic pattern of phytoplankton phenology. The environmental conditions such as water depth, sea surface temperature, sea surface wind and global climatic changes will be examined to address the coupling relationships between phenological changes of marine phytoplankton biomass and the changes of marine environmental conditions. The results of this project are supposed to enhance our understanding of variability in phytoplankton biomass in BYS, and provide theory foundations for interpreting climate changes account for long-term variability of phytoplankton biomass.