Copernicus Global Land Operations Lot 2 Date August 16, 2020 Copernicus Global Land Operations Cryosphere and Water C-GLOPS2 Framework Service Contract N 199496 (JRC) August 16, 2020 QUALITY ASSESSMENT REPORT LAKE SURFACE WATER TEMPERATURE 1KM PRODUCTS VERSION 1.0.1, 1.0.2 and 1.1.0 ISSUE I1.09 Organization name of lead contractor for this deliverable: Book Captain: Laura Carrea (University of Reading) Contributing Authors: Chris Merchant (University of Reading) Copernicus Global Land Operations Lot 2 Date August 16, 2020 Dissemination Level PU Public X PP Restricted to other programme participants (including the Commission Services) RE Restricted to a group specified by the consortium (including the Commission Services) CO Confidential, only for members of the consortium (including the Commission Services) Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 2 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 Document Release Sheet Book Captain: Laura Carrea (University of Reading) Sign Date Approval: Sign Date Endorsement: Sign Date Distribution: Public Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 3 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 Change Record Issue/Rev Date Page(s) Description of Change Release I1.01: 26.06.2018 21 First Version for QAR Lake Surface Water Tem- perature products Version 1.1.0 I1.02: 09.11.2017 21 Internal review I1.03: 27.06.2018 21 Internal review I1.04: 26.06.2018 33 Internal review I1.05: 22.03.2019 36 Corrections according to Review 4 I1.06: 22.05.2019 34 Final minor corrections according to Review 4 I1.07: 30.11.2019 46 Inclusion of the validation of the LSWT product from Sentinel-3A SLSTR instrument. Update of the C-GLOPS website link at the University of Reading. Introduction of SLSTR-A LSWT v1.0.2 for reprocessed data. I1.08: 22.04.2020 46 Introduction of SLSTR-A/B LSWT v1.1.0. I1.09: 01.08.2020 67 Assessment of the reprocessed SLSTR-A NRT LSWT v1.0.1 product (v1.0.2) and assessment of the SLSTR-AB 10-day product (v1.1.0). Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 4 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 Contents 1 Background of the document 14 1.1 Executivesummary..................................... 14 1.2 Scope and objectives . 14 1.3 Contentofthedocument.................................. 15 1.4 Relateddocuments..................................... 15 1.4.1 Applicable documents . 15 1.4.2 Input ........................................ 15 1.4.3 Output ....................................... 16 1.4.4 Externaldocuments ................................ 16 2 Review of user requirements 16 3 Quality assessment method 16 3.1 Overallprocedure...................................... 16 3.1.1 Advanced Along-Track Scanning Radiometer (AATSR) LSWT . 17 3.1.2 SLSTR-A LSWT . 17 3.1.3 SLSTR-A-Sentinel3-B Sea and Land Surface Temperature Radiometer (SLSTR- B)LSWT...................................... 18 3.2 Satellitereferenceproduct................................. 18 3.3 Insitureferenceproduct.................................. 18 4Results 20 4.1 Validation of L2P LSWT . 20 4.1.1 Validation of L2P AATSR LSWT . 20 4.1.2 Validation of L2P SLSTR-A LSWT . 23 4.1.3 L2P LSWT validation discussion . 25 4.2 Validation of the C-GLOPS 10-day LSWT . 27 4.2.1 Validation of C-GLOPS AATSR LSWT . 27 4.2.2 Validation of C-GLOPS SLSTR-A LSWT . 33 4.2.3 10-day LSWT validation discussion . 38 4.3 Validation of the C-GLOPS LSWT uncertainty . 39 4.3.1 Validation of the C-GLOPS AATSR LSWT uncertainty . 39 4.3.2 Validation of the C-GLOPS SLSTR-A LSWT uncertainty . 39 4.4 Validation of C-GLOPS SLSTR-A NRT LSWT . 41 4.5 Assessment of the SLSTR-A LSWT reprocessed product . 43 4.6 Assessment of the SLSTR-AB LSWT product . 51 4.7 Visual inspection . 58 4.7.1 Spatial AATSR LSWT . 58 4.7.2 Spatial SLSTR-A LSWT . 61 4.7.3 Spatial SLSTR-AB LSWT . 62 5 Summary 63 6 Limitations and known issues 63 7 Recommendation 64 Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 5 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 A In situ data sources 65 Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 6 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 List of Figures 1 Geographical distribution of the in-situ observation sites used for the validation of theC-GLOPSproductfromtheAATSRinstrument. 19 2 Geographical distribution of the in-situ observation sites used for the validation of theC-GLOPSproductfromtheSLSTR-Ainstrument. 19 3 Example of quality control applied to in-situ measurements for Lake Huron in Canada at lat=45.54 lon=-81.01 for year 2002. The red line represents the data provided and the blue line represents the results of the quality control applied within the GloboLakes project and used for the C-GLOPS validation. 20 4 Location of the site of in-situ measurements for Lake Simcoe in Canada. 21 5 L2P LSWT validation for Lake Simcoe in Canada for the year 2009 (left) and 2010 (right) where all the in-situ daily mean temperatures (black line), in-situ matches (white dots), satellite matches (coloured dots according to the quality levels), satellite (AATSR) minus in-situ matches (green line) and the climatology with on standard deviation are reported. 22 6 Location of the site of in-situ measurements for Lake Itumbiara in Brazil and L2P validation for the year 2010 where all the in-situ daily mean temperatures (black line), in-situ matches (white dots), satellite matches (coloured dots according to the quality levels), satellite (AATSR) minus in-situ matches (green line) and the climatology with on standard deviation are reported. 22 7 L2P LSWT validation for Lake Simcoe in Canada for the year 2017 (left) and 2018 (right) where all the in-situ daily mean temperatures (black line), in-situ matches (white dots), satellite matches (coloured dots according to the quality levels), satellite (SLSTR-A) minus in-situ matches (green line) and the climatology with on standard deviation are reported. 24 8 Location of the site of in-situ measurements for Lake Tahoe in USA and L2P validation for the year 2018 where all the in-situ daily mean temperatures (black line), in-situ matches (white dots), satellite matches (coloured dots according to the quality levels), satellite (SLSTR-A) minus in-situ matches (green line) and the climatology with on standard deviation are reported. 24 9 Time series (left hand side) of the 10-day in-situ measurements and the C-GLOPS AATSR product for the two sites shown on the right hand side on the lake Superior in Canada/USA. The left hand side plots show 10-day mean in-situ observations (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erencesatelliteminusin-situobservations(redline). 27 10 Time series (left hand side) of the 10-day in-situ measurements and the 10-day C- GLOPS AATSR product for the two sites shown on the right hand side on the lake Huron in Canada/USA. The left hand side plots show 10-day mean in-situ observa- tions (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erence satellite minus in-situ observations (red line). 28 11 LSWT time series (right hand side) of the 10-day in-situ measurements and the 10-day C-GLOPS AATSR product for site on the Sea of Galilee in Israel shown on the left hand side of the figure. The left hand side plots show 10-day mean in-situ observations (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erence satellite minus in-situ observations (red line). 29 Document-No. CGLOPS2 QAR LSWT 1km v1.0.1 I1.09 c C-CGLOPS2 consortium Issue: I1.09 Page 7 of 67 Copernicus Global Land Operations Lot 2 Date August 16, 2020 12 Time series (left hand side) of the 10-day in-situ measurements and the 10-day AATSR C-GLOPS product for the site shown on the right hand side on the Sea of Galilee in Israel. The left hand side plots show 10-day mean in-situ observations (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erencesatelliteminusin-situobservations(redline). 31 13 Plot of the di↵erence satellite minus in-situ against the in-situ measurements and of the AATSR C-GLOPS product against the in-situ measurements for all the matches andallthequalitylevels. ................................. 32 14 Time series (left hand side) of the 10-day in-situ measurements and the SLSTR-A C- GLOPS product for the two sites shown on the right hand side on the lake Superior in Canada/USA. The left hand side plots show 10-day mean in-situ observations (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erencesatelliteminusin-situobservations(redline). 33 15 Time series (left hand side) of the 10-day in-situ measurements and the 10-day SLSTR- A C-GLOPS product for the two sites shown on the right hand side on the lake Huron in Canada/USA. The left hand side plots show 10-day mean in-situ observations (black line), the C-GLOPS LSWT matches (coloured dots according to quality levels) and the di↵erencesatelliteminusin-situobservations(redline).