Multiple Influences and Seasonal Differences of Chlorophyll-a Concentration in Southeast Coast of China based on Generalized Additive Model
The concentration of chlorophyll-a is a key indicator for evaluating the eutrophication of coastal wa-ter,and the research on the influencing factors of coastal chlorophyll-a is significant to marine environmental protection.However,the existing studies mostly focus on the effect of natural factors on the concentration of chlorophyll-a in coastal waters,ignoring the human activities.Therefore,this paper uses nighttime light bright-ness to characterize the intensity of human activities,and divides cities on the southeastern coast into three types based on its relationship with coastal chlorophyll-a concentration,and also combines sea surface temperature,wind speed,solar radiation,precipitation and human factors,using the Generalized Additive Model(GAM)to analyze the impact of multiple factors on coastal chlorophyll-a concentration in three types of cities in different seasons.The results show that the change of chlorophyll-a concentration was dominated by natural factors in type Ⅰ cities such as Fuzhou and Shantou,the dominant factor in spring is wind speed,and the sea surface tem-perature in summer,autumn and winter;while human activities have little effect.Type Ⅱ cities such as Zhuhai and Dongguan are dominated by natural factors.The dominant factor is wind speed in spring,autumn and win-ter,and the sea surface temperature in summer;human activities have a greater promoting effect in summer and autumn.Type Ⅲ cities such as Shenzhen and Hongkong are dominated by human factors.Human activities have the greatest impact on chlorophyll-a concentration in spring,summer and autumn and they are a negatively correlated.In winter,sea surface temperature has the greatest impact.
Chlorophyll-ahuman activitiesNatural factorsGeneralized Additive Model(GAM)Southeast coast of China
NETL
NSTL
万方数据
维普
