基于广义相加模型的东南沿海叶绿素a浓度的多重影响与季节差异
Multiple Influences and Seasonal Differences of Chlorophyll-a Concentration in Southeast Coast of China based on Generalized Additive Model
张婧薇 1陈佐旗 1苏华1
作者信息
- 1. 福州大学卫星空间信息技术综合应用国家地方联合工程研究中心、空间数据挖掘与信息共享教育部重点实验室,福建福州 350108;福州大学数字中国研究院(福建),福建福州 350108
- 折叠
摘要
叶绿素a浓度可以评估海水富营养化状况,对沿海叶绿素a浓度影响因素的研究在海洋环境保护方面具有重要意义.而现有研究多关注自然因素对沿海叶绿素a浓度的影响,忽视了人为因素的作用.因此实验以夜间灯光遥感数据表征人类活动强度,根据夜间灯光亮度和沿海叶绿素a浓度间的关系将东南沿海的城市分为3个类型,并同时结合海表温度、风速、太阳辐射、降水等自然因素,通过广义相加模型(GAM)分析不同季节下3类城市中人为和自然等多重因素对沿海叶绿素a浓度的影响.结果表明:在北海、汕头等类型Ⅰ城市中自然因素主导叶绿素a浓度的变化,春季的主导因素为风速,夏、秋、冬季为海表温度;而人类活动对叶绿素a浓度的影响较小且没有显著的影响关系.珠海、东莞等类型Ⅱ城市的叶绿素a浓度受自然因素主导,春、秋、冬季的主导因素为风速,夏季为海表温度;而人类活动在夏、秋季对沿海叶绿素a浓度有较大的促进作用.深圳、香港等类型Ⅲ城市中人为因素主导叶绿素a浓度的变化,春、夏、秋季人类活动对叶绿素a浓度的影响最大且为负相关,冬季海表温度对叶绿素a浓度的影响最大.
Abstract
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.
关键词
叶绿素a/人类活动/自然因素/广义相加模型(GAM)/东南沿海Key words
Chlorophyll-a/human activities/Natural factors/Generalized Additive Model(GAM)/Southeast coast of China引用本文复制引用
基金项目
国家自然科学基金面上项目(41971384)
福建省杰出青年科学基金(2021J06014)
出版年
2024
NETL
NSTL
维普
万方数据