POSTER Session 4
Thursday, October 10
11:10–13:00
Poster Session | 1 | 2 | 3 | 4 | Instructions | Schedule at a Glance
ABSTRACT 801 | POSTER TH-122
CAN WE SHED NEW LIGHT ON THE MURKINESS OF OPTICALLY COMPLEX WATER FROM SPACE?
The diffuse light attenuation coefficient (Kd) defines the penetration of surface light through the water column. For Denmark, it is included as a supporting parameter for assessing good ecological status within the European Waterwork Framework Directive. Variations in Kd are primarily associated with light attenuation from pigments, particles and dissolved organic matter, and their individual absorption and scattering spectra. In practice, Kd is primarily determined in situ by light profile measurements, which makes it possible to approximate a Kd value in the photosynthetically active part of the light spectrum (KdPAR; 400-700 nm). These KdPAR measurements are associated with two uncertainties in particular: 1) A homogeneous (non-stratified) water column is assumed, and 2) KdPAR is usually measured at deeper stations away from the coast. Dynamics and turbulence in near-coastal and shallow waters, however, contribute to KdPAR being considerably higher and more variable in the areas where benthic vegetation grows. In this study, we develop an advanced optical model to estimate KdPAR spectrally using satellite-based (Sentinel-3 OLCI, S3) data. Daily data for absorption and scattering coefficients from pigments, detritus and CDOM, and total suspended matter of light are obtained from S3 to derive estimates of KdPAR. These are aligned with in situ KdPAR monitoring data from Denmark to assess and discuss the applicability of the new method in the future monitoring.
Sanjina Staehr, Aarhus University Danish Centre for Environment and Energy, Denmark, [email protected], https://orcid.org/0000-0003-4968-9649
Andreas Michael Holbach, Aarhus University Danish Centre for Environment and Energy, Denmark, [email protected], https://orcid.org/0000-0002-7665-9341
Peter Anton Upadhyay Staehr, Aarhus University Danish Centre for Environment and Energy, Denmark, [email protected], https://orcid.org/0000-0002-1580-4875
Stiig Markager, Aarhus University Danish Centre for Environment and Energy, Denmark, [email protected], https://orcid.org/0000-0001-5427-2026
Poster Session | 1 | 2 | 3 | 4 |
Instructions | Schedule at a Glance
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