[Concepts, boundaries, and trade-offs of coastal blue well-being].

Marine ecosystems provide material resources and development space for human production and life, which is crucial to economic development and human well-being. Coastal blue well-being refers to the positive states of human life in coastal areas supported by ecosystem services, including subjective emotional and cognitive dimensions as well as the objective natural, economic, and social dimensions. How to achieve the dual goals of protecting the ocean and improving human well-being is a core issue in ensuring marine sustainable development. When considering the connotation of coastal blue well-being, it is necessary to analyze the relationship between marine ecosystems and human well-being, and identify the coastal blue well-being components related to ecosystem services. Here, we sorted out the linkage framework and trade-off relationship between marine ecosystem services and coastal blue well-being based on the theory of well-being, and clarified the evaluation dimension of coastal blue well-being. This study would provide theoretical supports for dynamic monitoring of coastal blue well-being and the trade-off of related interests, as well as a theoretical basis for the program of improving coastal blue well-being.