chlorophyll-a, phycocyanin and phytoplankton type...
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User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Mariano Bresciani, Monica Pinardi, Claudia Giardino – CNR IREA – [email protected]
Chlorophyll-a, Phycocyanin and Phytoplankton type products
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
• Implementation of algorithms dedicated to phytoplankton's
• Integrate semi-empirical approaches and bio-optical modeling
• Exploitation of hyperspectral sensors
• Producing useful maps for users • Qualification of Sentinel 2/3 for
phytoplankton
Aims
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Case studies: from blue to green waters
MANTUA
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
The parametrization was based on inherent optical properties measured
in the study areas.
Algorithm concept
An adaptive choice of wvl was adopted to consider the shift of Rrs features
depending on pigment concentration. Regression lines for calibrating the 2-band algorithm for estimating Chl-a
merging all the samples.
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Specific absorption spectra of four phytoplankton classes characterised by
different algal pigments (color lines) and specific backscattering spectra of three
different water types used to parametrise the model (dotted lines).
List of scale and spectral parameters for running bio-
optical model.
Bio-optical modelling
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
An adaptive choice of wvl with a relative maximum and minimum in the regions which are sensitive to pigments variations was adopted to consider the shift of Rrs features depending on pigment concentration.
Semi-empiric
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Validation
Chl-a APEX
Curonia Mantua Match-up of in situ Chl-a and imagery data
Chl-a Sentinel-2 and Sentinel-3
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Validation Match-up of satellite
imagery Southern lake Garda
Dolichospermum lemmermanni In situ Chl-a 4.8 (±0.7 mg/m3)
17-08-2016 Sentinel-2
17-08-2016 Sentinel-3
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Chlorophyll-a concentration map for the Mantua lakes system (APEX, 21
September 2011).
Chlorophyll-a concentration map for the Mantua lakes
system (APEX, 27 September 2014).
Mantua Lakes Chl-a from APEX
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Mantua Lakes Chl-a from S2 mg/m3
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Time series
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Mantua Lakes Phytoplankton types from APEX
PC index 21-09-2011
RS: WGS84 / UTM zone 32N
A proxy of PFT map of the Superior Lake derived from APEX 2014: Diatoms are mapped in turquoise;
Cryptophyta species and Planktothrix sp., a cyanobacteria specie dominated by phycoerythrin (PE)
pigments, are depicted in red.
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Mantua Lakes Phytoplankton Type maps from S2
In situ
In situ
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
APEX, 27 September 2014
(Sentinel-2, 18 June 2016) (Sentinel-2, 9 September 2016)
Mantua Lakes WFD maps
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Curonian Lagoon PC and Chl-a from APEX
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
0
150 mg m-3
Sentinel-2 17/08/2015
0
100 mg m-3
Curonian Lagoon Chl-a from S2 and S3 Sentinel-3
03/09/2017 Sentinel-2 24/08/2016
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Cyanobacteria scum presence during June-October 2013-2016.
From 30 cloud free Landsat 8 MCI images in 13 images (corresponding
100%) cyanobacteria scum was detected.
Curonia Lagoon SCUM
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Sentinel-2 Sentinel-3 Landsat-8
Chl-a
WFD
Garda Lake products
User Uptake Workshop
16-17 November 2017
European Environment Agency, Copenhagen, Denmark
Conclusions • The results confirm the robustness of bio-optical model and
adaptive semi-empirical algorithms for Chl-a retrieval in oligo-mesotrophic and in meso-eutrophic waters, respectively.
• The results show that remote sensing data can help to monitor water quality.
• High spatial and spectral resolutions data were useful to recognize phytoplankton blooms
• Although not specifically designed for water quality, S2 is providing comparable result to ground truth.
• S3 needs more matchups data but it we expect that it will provide level 2 products in continuity with MERIS.