Assessing water clarity status and long-term trends in North America's largest lakes using ESA's Ocean Colour Climate Change Initiative (OC-CCI) products

被引：0

作者：

Binding, Caren ^{[1
]}

Morison, Matt ^{[2
]}

Sayers, Michael ^{[3
]}

Bosse, Karl ^{[3
]}

Zhu, Xinhua ^{[4
]}

Zeng, Chuiqing ^{[1
]}

Theenathayalan, Varunan ^{[1
]}

机构：

[1] Environment and Climate Change Canada, Canada Centre for Inland Waters, 867 Lakeshore Road, Burlington,ON,L7S1A1, Canada

[2] Manitoba Environment and Climate Change, 14 Fultz Blvd, Winnipeg,MB,R3Y 0L6, Canada

[3] Michigan Tech Research Institute, Michigan Tech University, Ann Arbor,MI, United States

[4] Fisheries and Oceans Canada, Freshwater Institute, 501 University Crescent, Winnipeg,MB,R3T 2N6, Canada

来源：

Journal of Great Lakes Research | 2024年 / 50卷 / 06期

基金：

美国海洋和大气管理局;

关键词：

Tropics;

D O I：

10.1016/j.jglr.2024.102454

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

Water clarity, as measured by Secchi disk depth (ZSD) or diffuse attenuation (Kd), is an important indicator of a lake's ecosystem state and can be reliably retrieved using satellite remote sensing. By combining data from multiple satellite missions, the European Space Agency's Ocean Colour Climate Change Initiative (OC-CCI) aims to deliver stable, long-term, satellite data products suitable for trend assessments. Here we demonstrate the value of OC-CCI products for reporting on water clarity status and long-term trends in North America's largest lakes. Extensive matchups between the OC-CCI Kd at 490 nm (Kd490) and in situ ZSD observations spanning 25 years enabled robust multi-lake validation of ZSD retrievals over a wide range of water clarity conditions (R2 = 0.9, MAPE = 29.6 %, BIAS = 6.6 %, N = 4297) providing a transferable model for large-scale mapping of inland water clarity. Significant differences in ZSD retrieval uncertainty were observed between years, missions, and specific periods marking changes in the sensor datasets contributing to the OC-CCI products. Bias-correction of the OC-CCI Kd490 provided confidence in the assumption of seamless continuity in this multi-mission dataset, thereby allowing long-term time-series analyses. Seasonal, inter-annual and inter-decadal variability and trends in lake-wide average ZSD were subsequently evaluated for nine large lakes across Canada and the U.S. over the 1998–2023 period, capturing the timing and magnitude of significant shifts in water clarity conditions. Observations agree well with documented periods of ecosystem change in response to the cumulative impacts from harmful algal blooms, nutrient status, invasive species, and hydrological events. © 2024

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