西北师范大学学报（自然科学版）2025，Vol.61Issue(6)：74-85,12.DOI:10.16783/j.cnki.nwnuz.2025.06.009
珠江口-江门海域叶绿素a浓度与总磷时空变化特征
The spatiotemporal variation of chlorophyll-a concentration and total phosphorus in the coastal area of Pearl River Estuary-Jiangmen
摘要
Abstract
Monitoring the temporal and spatial distribution of total phosphorus and chlorophyll a concentration can provide a scientific basis for marine ecological protection.Based on the measured data of chlorophyll a and total phosphorus concentrations in 2023,the changes of chlorophyll a and total phosphorus concentrations in the Pearl River Estuary-Jiangmen Sea area from 2018 to 2023 were inverted using the random forest regression model based on the OLCI water color sensor carried by Sentinel-3A satellite,and their spatio-temporal variation characteristics and driving factors were analyzed.The results showed that the chlorophyll a concentration decreased from 2018 to 2023,and then increased after the low point in 2021,and decreased in nearshore and pelagic waters.The concentration of chlorophyll a was the highest in summer and the lowest in winter,and the concentration of chlorophyll a in summer,autumn and winter of 2021 was the lowest in six years,which may be affected by drought.From 2021 to 2023,chlorophyll a gradually increased from January to June,stabilized after the peak in June,and began to decline in October.The total phosphorus concentration increased significantly after 2021,and the increased rate in coastal waters was greater than that in other areas.The total phosphorus concentration was higher in winter and lowest in summer,and fluctuated significantly in spring and summer.The total phosphorus concentration in 2023 was higher than that in the previous two years,showing a low concentration from April to September,a high concentration from October to March of the following year,and a large change range in coastal waters.In spring and summer,sea surface temperature and wind speed increased the concentration of chlorophyll a and dissolved oxygen increased the concentration of total phosphorus.In autumn and winter,sea surface temperature and precipitation were the main promoting factors of chlorophyll a.关键词
珠江口/江门海域/叶绿素a浓度/时空变化/驱动分析Key words
Pearl River Estuary/coastal area of Jiangmen/chlorophyll-a concentration/spatiotemporal variation/driving analysis分类
海洋科学引用本文复制引用
田洪阵,杨佳,张政,刘沁萍..珠江口-江门海域叶绿素a浓度与总磷时空变化特征[J].西北师范大学学报（自然科学版）,2025,61(6):74-85,12.基金项目
粤西水质采样、监测及水文遥感技术服务项目(117082408401) （117082408401）
山东省自然科学青年基金资助项目(ZR2023QD190) （ZR2023QD190）
