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Globcolour, Medspiration application, 21 November 2007 Towards an integrated SST and Ocean Color dataset for coastal applications at Ifremer Bertrand Saulquin.

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Presentation on theme: "Globcolour, Medspiration application, 21 November 2007 Towards an integrated SST and Ocean Color dataset for coastal applications at Ifremer Bertrand Saulquin."— Presentation transcript:

1 Globcolour, Medspiration application, 21 November 2007 Towards an integrated SST and Ocean Color dataset for coastal applications at Ifremer Bertrand Saulquin & Francis Gohin

2 Globcolour, Medspiration application, 21 November 2007 Introduction For the coastal environmental monitoring, different parameters such as the temperature, chlorophyll-a, turbidity are measured regularly on the French coasts since The application of the new Water Framework Directive (WFD), based on these data, tends to increase the number of stations. At the moment satellite data are not systematically used on coastal area. This come from historical problems in the satellite data such as atmospheric corrections (ocean colour), land effects (all sensors) … that led to some lacks in the data on the shores or some problems on the quality of the retrievements. The developpement of regional or dedicated algorithms, associated with the increasing resolution of the sensors, tends to increase the reliability of the satellite in these areas.

3 Globcolour, Medspiration application, 21 November 2007 Chlorophyll Turbidity SST 3 Parameters available in situ and from R/S techniques One of Ifremers objectives is to compare systematically time series of in situ data and satellite data for these parameters at some selected stations. These comparisons will be freely accessible using Web servers such as NAUSICAA and will allow us to validate our global and regional products (SST and Color) and help also our users to evaluate satellite data and in situ data compared to an average situation. Actions supported by : MARCOAST (GMES-Service Element, ESA funded) ECOOP (European Coastal sea Operational Observing and Forecasting System, FP6)

4 Globcolour, Medspiration application, 21 November 2007 Operational satellite products available at Ifremer, mean OC5 Chl-a and turbidity for October Turbidity Chl-a Turbidity, Modis, computed with Ifremer regional algorithm. Chl-a, Modis, computed with Ifremer regional algorithm. Also available SPM, Kpar, secchi depth, radiances… and Meris case1 and case2.

5 Globcolour, Medspiration application, 21 November 2007 Medspiration product: NOAA 18, NAR SST Merged SST products available at Ifremer: -Global Scale: -ODYSSEA Mersea Product. Operational satellite products available at Ifremer, mean SST of October 2007.

6 Globcolour, Medspiration application, 21 November 2007 The Ocean Color satellite / in situ experience at Ifremer for coastal waters.

7 Globcolour, Medspiration application, 21 November 2007 More than 300 stations along the French coasts. -Regular measurements of temperature, chlorophyll, turbidity, salinity, oxygen on all stations. -Phytoplankton determination and toxicity measurments at some of the stations. REPHY: Phytoplankton and Phycotoxins Monitoring Network The network is actually in an updating phase, with some displacements of existing stations regarding the representativeness in the water body, and the creation of new stations. - These coastal in situ data are the base for the coastal environmental policies

8 Globcolour, Medspiration application, 21 November 2007 A privileged link has been established between the in situ networks and the Dyneco/LOS departments at Ifremer for the Water Framework Directive. National in situ networks REPHY: phytoplankton & hydrology / Ifremer SOMLIT: hydrology / CNRS-INSU

9 Regional Chl-a algorithm validation at the network stations Boulogne point 2, SeaWIFS OC5 vs In situ Boulogne point 2, MODIS OC5 vs In situ

10 Cabourg, SeaWIFS OC5 vs In situ Cabourg, MODIS OC5 vs In situ Regional Chl-a algorithm validation at the network stations

11 Cancale, SeaWIFS OC5 vs In situ Cancale, MODIS OC5 vs In situ Regional Chl-a algorithm validation at the network stations Other validation plots and publication available on demand.

12 The latest image 5 days before departure of the CEFAS cruise (11th April 2007) shows events in the eastern North Sea in detail. The Oyster Ground SmartBuoy site is now located on the edge of a bloom, as shown by the increase in chlorophyll fluorescence on the 9th April (trace below). Combined use of GKSS ferry data and Ifremer remote sensing shows in detail the position of a large bloom north of the Dutch-German border (extract from Report CEFAS n°4)

13 A future application for the satellite colour data in coastal area, the WFD directive?

14 Globcolour, Medspiration application, 21 November 2007 The SST experience at Ifremer for coastal waters. Objectives: -Determination of the average situations and trends. -Building an historical interpolated SST data set since Provide some comparisons with the historical and real time coastal in situ data.

15 Globcolour, Medspiration application, 21 November 2007 The average SST(x,t) and trends have been modelled from AVHRR/Pathfinder and coastal stations in situ data (longer series than for ocean color).

16 Globcolour, Medspiration application, 21 November 2007 ROSCOFF 89.6% of the variance explained by 2 harmonics FLAMANVILLE 95.2% of variance explained by 2 harmonics The temporal model for the average SST(x,t).

17 Parameters P0 and P1 calculated from AVHRR data ( ) P1, warming slopeP0, average SST 1986 SST(t)= P0+P1*t - P2*cos[2pi/365(t-P3)]-P4*cos[2pi/182.5(t-P5)]

18 P2, half amplitude of the first harmonicP3, phase of the first harmonic SST(t)= P0+P1*t- P2*cos[2pi/365(t-P3)]-P4*cos[2pi/182.5(t-P5)] Parameters P2 and P3

19 Globcolour, Medspiration application, 21 November 2007 Evaluation of the SST model over the périod Standard deviation satellite SST / model

20 Globcolour, Medspiration application, 21 November 2007 The model is used in the kriging procedure of the AVHRR data ( ) and the Medpiration products (NAR) since the beginning of Example of kriging of a daily SST image (Medspiration NAR 18, 2007/11/07). Time interval for the OI [-4days,+4days]

21 Globcolour, Medspiration application, 21 November 2007 Resulting SST images for the NAR 18 image of the 07/11/2007 Kriged SST Anomaly Daily anomaly Daily SST Recomposed SST

22 Globcolour, Medspiration application, 21 November 2007 Comparison between the SST model and a daily image, sample of the NAR 18 for the 08/11/2007

23 Globcolour, Medspiration application, 21 November 2007 Validation of the satellite interpolated SST on the in situ observations at coastal stations Station of Wimereux Offshore to coastal temperature model.

24 Globcolour, Medspiration application, 21 November 2007 Satellite SSTKriged satellite SST Station (sampling during the day) Nb match- ups Bias Sat-Situ St. dev. Sat-Situ Nb match-upsBias Sat-Situ St. dev Sat- Situ Wimereux Boulogne Roscoff Dunkerque Statistical results, comparisons of kriged SST with in situ data. Satellite SSTKriged satellite SST StationNb match- ups Bias Sat-Situ St. dev. Sat-Situ Nb match-upsBias Sat-Situ St. dev. Sat- Situ Profiles data Thermo- salinograph data

25 Globcolour, Medspiration application, 21 November 2007 Towards the integrated SST, Chl, Turbidity approach for coastal monitoring. A way to increase the users community is to show automatically the comparison of real time data at the stations: a difficult exercice.

26 Globcolour, Medspiration application, 21 November 2007 The solid line when available represent the mean in situ calculated over the period and the dotted line the percentile 90. POINT_3_Boulogne 2003 SST model

27 Globcolour, Medspiration application, 21 November 2007 The solid line when available represent the mean in situ calculated over the period and the dotted line the percentile 90. POINT_3_Boulogne 2005

28 Globcolour, Medspiration application, 21 November 2007 Cabourg 2003

29 Globcolour, Medspiration application, 21 November 2007 Cabourg 2005

30 Globcolour, Medspiration application, 21 November 2007 Conclusions 3 parameters, SST, Chl, Turbidity, are available in situ and by R/S for the monitoring of coastal waters for the WFD and in the spirit of GMES. Daily graphs of SST, Chlorophyll, Turbidity, observations, historical average and Percentile 90, will be available at local stations through Nausicaa. Model outputs will be added to the graphs. Historical SST data are provided by the AVHRR Pathfinder whose data has proven to be reliable even in the coastal waters of the English Channel. Real time SST will be provided through Medspiration. We must develop the interactions with the user community concerned by the coastal waters satellite data. Contact:

31 Globcolour, Medspiration application, 21 November 2007 illustration of the warming for the English channel since 1933.

32 Mean SST derived from the model for years 1986 and 2006.


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