light attenuation and euphotic depth products · 2017. 11. 23. · user uptake workshop 16-17...
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User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Dimitry Van der Zande – RBINS Contributions from Ustirling, CNR, DELTARES, MTA ÖK, Klaipeda University
Light attenuation and euphotic depth products
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Photic Zone
Photic Zone
Irradiance (Ed)
Depth
Introduction: Light attenuation/extinction
Kd(z,λ) = -1 dEd(z, λ) Ed(z, λ) dz
Ze = depth at which 1% of surface PAR remains
Ze
Ze
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Resp.
Photic Zone
Photic Zone
Irradiance
Depth
Introduction: impact on primary production
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
To develop/adapt algorithms for Sentinel-2, EnMAP/PRISMA and APEX taking water reflectance data and auxillary data as input and
provide Kd, KdPAR and Ze.
Light attenuation
(Lee et al., 2005)
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Quasi-Analytical Algorithm (QAA) • Start from Multi-band
QAAv6
• Derive a and bbp by inverting Rrs(λ)
• Originally developed for marine application using OC-missions (MERIS, MODIS,..)
Adapt QAAv6 to L8, S2
QAAv6: a(670)
QAAv5: a(55x)
Rrs(670) > 0.0015 sr-1 Rrs(670) < 0.0015 sr-1
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 Algorithm Development (1) Adapt QAAv6 to band characteristics
• Central wavelengths do not differ greatly
between different sensors
• SRFs show considerable differences between Ocean color and land sensors
Rrs490 (S3/MERIS/MODIS) != Rrs490 (S2/L8) Quantify the impact of these differences on the QAAv6 and adapt the algorithm
S3-OLCI
S2-MSI
L8-OLI
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
• 5000 simulated Rrs(λ) for different water types (*CCRRv1 dataset)
• 4-component model: pure water, CHL, MIN, CDOM
• CHL, MIN, CDOM are co-varied
• All concentrations constant with depth
• Water column is infinitely deep
*Dataset available at PANGAEA: Nechad, B et al. (2015): CoastColour Round
Robin datasets, Version 1. doi:10.1594/PANGAEA.841950,
T5.2.1-3 HydroLight dataset
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Input • IOPs: atot, btot, bbtot • aphy, bb /(a+ bb) • 3 sun zenith angles (0°,40°,60°) Output • hyperspectral outputs (350 nm to 900
nm, 5 nm step) • Multispectral outputs
(MODIS/MERIS/SEAWIFS) Rhow, Kd • EdPAR, KdPAR
T5.2.1 HydroLight dataset
L8-OLI and S2-MSI bandsets were simulated using their respective SRFs and hyperspectral Rhow
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 Rrs between sensors
Rrs443 S2-MSI 2.10% L8-OLI 1.00% Rrs490 S2-MSI 6.60% L8-OLI 7.20% Rrs560 S2-MSI 1.80% L8-OLI 6.00% Rrs665 S2-MSI 10.40% L8-OLI 16.00%
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 Spectral shift – S2 443nm 560nm
490nm 665nm
mape 6.00%
mape 7.20%
mape 16.00%
mape 2.10%
mape 6.60%
mape 10.40%
Rrs443 S2-MSI 0.60% L8-OLI 0.30% Rrs490 S2-MSI 6.50% L8-OLI 0.80% Rrs560 S2-MSI 1.70% L8-OLI 1.10% Rrs665 S2-MSI 5.90% L8-OLI 3.00%
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 Adapted QAAv6 Spectral shift
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 QAAv6 results
a490 bbp490 Kd490
L8
S2
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
T5.2.1 KdPAR
Nechad et al. KdPAR = a*log(1+Kd(500nm)+b
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Lake Balaton
The lake is very shallow (mean depth 3.3 m) and does not stratify. It is characteristically turbid due to wind-driven resuspension of fine bottom sediments. Phytoplankton is highly variable both spatially and temporally, with a gradient in total biomass along the main NE-SW longitudinal axis. Diatoms tend to dominate the phytoplankton composition during the spring bloom, while cyanobacteria is dominant in summer-autumn.
Lake Balaton in Hungary is the largest lake in central Europe covering 596 km2. It is also one of the region’s foremost tourist destinations.
The Zala River in the south western region of the lake provides the largest inflow of water. Sió in the north eastern region is the only outflow.
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Kd products Balaton 16/7/2014 -rayleigh corrected RGB
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Kd products Balaton 16/7/2014 -SPM product Nechad665
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Kd products Balaton 16/7/2014 -Kd490
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Sentinel-2 Landsat 8
KdPAR
Kd490
Lake Balaton- PRODUCTS
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Lake Marken
Lake Marken (Markermeer) is a 700 km2 large, artificial, shallow lake in the Netherlands.
In the last 20 years waterfowl and fish populations in Lake Marken decreased drastically. As a measure to improve the ecology of the lake, a swamp area named ‘Marken Wadden’, is currently constructed in the eastern part of the lake. In 2020 an archipel of 5 islands should be ready.
It is part of a former brackish, 4000 km2 inland sea (Zuiderzee) that was dammed and turned into Lake IJssel in 1932. About ten years after closure of the dam an equilibrium between erosion and sedimentation developed, resulting in a more or less stable amount of suspended sediment, with a gradient of relatively low concentrations on average in the west to higher concentrations in the east.
08/09/2016 21/04/2016
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
KdPAR map for the Lake Marken (S2-MSI, 1 April 2016).
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Sentinel-2 Landsat 8
KdPAR
Kd490
Lake Marken - PRODUCTS
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Validation KdPAR product
Raw data • Exclude ship shadow • bin per m • QC by plotting in log
scale
• Least Square Regression fit
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
KdPAR (1/m) retrieval from S2-MSI and L8-OLI and validation
Statistics for the validation of S2 and L8 derived KdPAR products for Mantua lakes, Lake Balaton, Lake Garda, Lake Iseo and Lake Maggiore. MAE = Mean Absolute Error; MAPE=Mean Absolute Percentage
Error; rRMSE= relative Root Mean Square Error; R2=correlation coefficient; N=validation sampling size.
In-situ data for validation was gathered during multiple field campaigns (2013 – 2016) organised by the project partners in different European inland waters: Lake Balaton, Lake Mantua, Lake Garda, Lake Maggiore and Lake Iseo. During these multi-instrument campaigns, depth profiles of downwelling PAR irradiance data was collected using a LiCOR sensor
Details can be found in the INFORM validation report
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Kd and Zeu product for Landsat-8 and Sentinel-2 data available through ACOLITE software
Details can be found in the INFORM validation report
Currently at version ‘2070718’ Binary distribution of L8/S2 AC processor for Windows, Linux and MAC Simple and fast processing of L8/S2 images for marine and inland water applications AC is image based, no need for external Inputs!! Freely available @ Google ‘ACOLITE REMSEM’ or https://odnature.naturalsciences.be/remsem/software-and-data/acolite
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Any Questions?
S2 10m resolution 16/1/2016
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
slack low tide high tide
Introduction: Scheldt Estuary (dynamic system)