Exploring the potential value of satellite remote sensing to monitor chlorophyll-a for US lakes and reservoirs
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Exploring the potential value of satellite remote sensing to monitor chlorophyll-a for US lakes and reservoirs Michael Papenfus & Blake Schaeffer Pollard & Keith Loftin
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Amina I.
Received: 15 October 2019 / Accepted: 24 September 2020 # This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020
Abstract Assessment of chlorophyll-a, an algal pigment, typically measured by field and laboratory in situ analyses, is used to estimate algal abundance and trophic status in lakes and reservoirs. In situ-based monitoring programs can be expensive, may not be spatially, and temporally comprehensive and results may not be available in the timeframe needed to make some management decisions, but can be more accurate, precise, and specific than remotely sensed measures. Satellite remotely sensed chlorophyll-a offers the potential for more geographically and temporally dense data collection to support estimates when used to augment or substitute for in situ measures. In this study, we compare available chlorophyll-a data from in situ and satellite
M. Papenfus (*) Office of Research & Development, U.S. Environmental Protection Agency, Corvallis, OR 97330, USA e-mail: [email protected] B. Schaeffer Office of Research & Development, U.S. Environmental Protection Agency, Research Triangle Park, NC 27711, USA e-mail: [email protected] A. I. Pollard Office of Water, U.S. Environmental Protection Agency, Washington, DC 20460, USA e-mail: [email protected] K. Loftin U.S. Geological Survey, Kansas Water Science Center, Lawrence, KS 66049, USA e-mail: [email protected]
imagery measures at the national scale and perform a cost analysis of these different monitoring approaches. The annual potential avoided costs associated with increasing the availability of remotely sensed chlorophylla values were estimated to range between $5.7 and $316 million depending upon the satellite program used and the timeframe considered. We also compared sociodemographic characteristics of the regions (both public and private lands) covered by both remote sensing and in situ data to check for any systematic differences across areas that have monitoring data. This analysis underscores the importance of continued support for both field-based in situ monitoring and satellite sensor programs that provide complementary information to water quality managers, given increased challenges associated with eutrophication, nuisance, and harmful algal bloom events. Keywords Chlorophyll . Harmful algal blooms . Water quality monitoring . Remote sensing . Lakes . Economic value
Introduction Chlorophyll-a as an indicator of eutrophication and harmful algal blooms Ecosystem stress in lakes and reservoirs has historically been evaluated based on water quality condition and biological integrity using a suite of laboratory and field
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(in situ) measures. Algae are a critical component of lake food webs and support primary consumers. Owing to its basal position in lake food webs
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