Monitoring and understanding chlorophyll-a concentration changes in lakes in northeastern China using MERIS and OLCI satellite data

Zhang, Lu1,2,3; Xin, Zhuohang1,4; Guan, Qi5; Feng, Lian6; Hu, Chuanmin3; Zhang, Chi1,4; Zhou, Huicheng1

2024-12-31

10.1080/15481603.2023.2285166

GISCIENCE & REMOTE SENSING   影响因子和分区

1548-1603

1943-7226

Lakes in the Northeast Plains-Mountain Lake Region (NPLR) of China face severe risks of eutrophication due to climate change and intensive anthropogenic pressures. As a vital indicator for eutrophication status, the dynamics of chlorophyll-a (Chl-a) concentrations in NPLR lakes were, for the first time, comprehensively investigated in this study. A support vector regression (SVR)-based model was established and applied to the MERIS (2003-2011) and OLCI (2016-2019) observations to derive a long-term Chl-a record for 33 NPLR lakes. The NPLR lakes exhibited a climatological annual mean Chl-a of 12.3 mg m(-3), ranging from 6.8 to 18.6 mg m-3 among the 33 studied lakes. During the study period, 11 lakes exhibited statistically significant increases in Chl-a concentrations (p < 0.05), and 3 lakes showed significantly decreasing trends. Spatially, lakes in lowland regions had higher Chl-a than those in mountainous regions. This study quantified the relative importance of seven explanatory factors in influencing interannual Chl-a changes for each lake. Results showed statistically significant impacts of agricultural fertilizer (10 lakes), wastewater (4 lakes), runoff (7 lakes), and wind (5 lakes) in affecting the interannual variations of Chl-a. The decreases in Chl-a were primarily attributed to the reduced livestock excrement. Compared to hydro-climatic factors, anthropogenic pressures (i.e. agriculture fertilizer, livestock excrement, and wastewater discharge) had more significant impacts on the interannual variations of Chl-a, accounting for more than 50% of 18 lakes. This study enhances our understanding of the long-term Chl-a dynamics in NPLR lakes and their responses to hydro-climatic factors and anthropogenic forcing. These findings are valuable for basin-scale water environment protection and sustainable development.

Chlorophyll-a reservoirs and lakes human activity MERIS OLCI northeastern China

SCI

英语

其他

National Natural Science Foundation of China["51925902","U21A20155","52279007"]

Physical Geography ; Remote Sensing

Geography, Physical ; Remote Sensing

WOS:001148097200001

TAYLOR & FRANCIS LTD

Web of Science

1.Dalian Univ Technol, Fac Infrastructure Engn, Dalian, Liaoning, Peoples R China
2.China Three Gorges Corp, Inst Sci & Technol, Beijing, Peoples R China
3.Univ S Florida, Coll Marine Sci, St Petersburg, FL USA
4.Dalian Univ Technol, State Key Lab Coastal & Offshore Engn, Dalian, Liaoning, Peoples R China
5.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Nanjing, Peoples R China
6.Southern Univ Sci & Technol, Sch Environm Sci & Engn, Shenzhen, Guangdong, Peoples R China

Zhang, Lu,Xin, Zhuohang,Guan, Qi,et al. Monitoring and understanding chlorophyll-a concentration changes in lakes in northeastern China using MERIS and OLCI satellite data[J]. GISCIENCE & REMOTE SENSING,2024,61(1).

Zhang, Lu.,Xin, Zhuohang.,Guan, Qi.,Feng, Lian.,Hu, Chuanmin.,...&Zhou, Huicheng.(2024).Monitoring and understanding chlorophyll-a concentration changes in lakes in northeastern China using MERIS and OLCI satellite data.GISCIENCE & REMOTE SENSING,61(1).

Zhang, Lu,et al."Monitoring and understanding chlorophyll-a concentration changes in lakes in northeastern China using MERIS and OLCI satellite data".GISCIENCE & REMOTE SENSING 61.1(2024).