Synergy between Satellite Altimetry and Optical Water Quality Data towards Improved Estimation of Lakes Ecological Status
Laen...
Kuupäev
2021
Kättesaadav alates
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
MDPI
Abstrakt
European countries are obligated to monitor and estimate ecological status of lakes under
European Union Water Framework Directive (2000/60/EC) for sustainable lakes’ ecosystems in
the future. In large and shallow lakes, physical, chemical, and biological water quality parameters
are influenced by the high natural variability of water level, exceeding anthropogenic variability,
and causing large uncertainty to the assessment of ecological status. Correction of metric values
used for the assessment of ecological status for the effect of natural water level fluctuation reduces
the signal-to-noise ratio in data and decreases the uncertainty of the status estimate. Here we
have explored the potential to create synergy between optical and altimetry data for more accurate
estimation of ecological status class of lakes. We have combined data from Sentinel-3 Synthetic
Aperture Radar Altimeter and Cryosat-2 SAR Interferometric Radar Altimeter to derive water level
estimations in order to apply corrections for chlorophyll a, phytoplankton biomass, and Secchi disc
depth estimations from Sentinel-3 Ocean and Land Color Instrument data. Long-term in situ data
was used to develop the methodology for the correction of water quality data for the effects of
water level applicable on the satellite data. The study shows suitability and potential to combine
optical and altimetry data to support in situ measurements and thereby support lake monitoring and
management. Combination of two different types of satellite data from the continuous Copernicus
program will advance the monitoring of lakes and improves the estimation of ecological status under
European Union Water Framework Directive.
Kirjeldus
Märksõnad
ecological status class of lake, European Union Water Framework Directive (2000/60/EC), water quality parameters, water level, Sentinel-3, Cryosat-2, shallow lakes, synergy, altimetry data, optical data, articles