medspiration user meeting, dec 4-6 use of medspiration and ghrsst data in the northern seas jacob l....
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Medspiration user meeting, dec 4-6
Use of Medspiration and GHRSST data in the Northern Seas
Jacob L. Høyer & Søren Andersen
Center for Ocean and Ice,
Danish Meteorological Institute
Medspiration user meeting, dec 4-6
Outline
1. Existing operational SST analysis for the North Sea and Baltic Seas
2. New SST analysis for North Atlantic, with focus on the Greenland waters
3. Conclusions and recommendations to Medspiration
Medspiration user meeting, dec 4-6
SST analysis for the North Sea/Baltic Sea
• SST analysis using optimal interpolation• Developed under the FP 5 project ODON. • Operational for 3 years • Local covariances, in x.y and time • Multiplatform with satellite dependent error
estimates• Only nighttime data• Bias corrections from in situ comparisons• Current spatial resolution: 0.03 degrees• Data ingested: O&SI-SAF, AVHRR 2 km,
AATSR 1 km, (AMSR-E) • Future: to be delivered within the Mersea
project in netcdf format on an opendap server
Medspiration user meeting, dec 4-6
Regional covariances-Spatial correlations -+50 km in x and y, averaged for
100x100 km bins-Contour intervals 0.1
Medspiration user meeting, dec 4-6
OI validation
Predictions compared against independent satellite and in situ observations:
OI RMS erroroC
Number of observations
Satellite data
(every 36 obs)
0.69 30290
In situ data 0.80 16810
Theoretical OI error
0.77 All grid points
Satellite validation
In situ validationReference: Høyer & She, JMS, 2006
Medspiration user meeting, dec 4-6
Satellite error correlations
The satellite error is correlated in space, not in time
Satellite correlation
In situ correlation
SpaceTime
In situ correlation
Satellite correlation
Correlations are calculated where both satellite and in situ observations are available
German Bight test case:
Daily real-time corrections based on bouy observations show RMS error improvements of more than 0.2oC
Medspiration user meeting, dec 4-6
Applications of North Sea/Baltic Sea SST analysis
• Used for NWP high resolution setup• Used for assimilation into a North Sea/Baltic Sea 3D model. • Several assimilation schemes tried out, Ensemble Kalman,
simplified Kalman, simplified Kalman+OI SST• Best combination was a simplified Kalman filter + OI SST fields
Reference: Larsen, Høyer & She, JMS, 2006
Medspiration user meeting, dec 4-6
Extension of OI scheme to other areas
• To support the round the world danish expedition, Galathea 3, a high resolution 0.05 degrees analysis has been made to cover the cruise track.
• Onboard research is guided by SST fields
• Focus area is the Greenland waters
• Based on the OSI-SAF, Medspiration and GHRSST data (ATSR, AVHRR, AMSR-E, TMI, SEVIRI 5km, (MODIS high res ).
• Very easy to set up new areas
• Static bias corrections based upon comparisons with in situ observations
• Individual satellite errors from in situ comparisons
• Experimenting with temporal bias corrections
• Weekly reruns to include delayed data
Medspiration user meeting, dec 4-6
Galathea 3 route covered with high resolution SST analysis products
Areas with high resolution SST analysis
Aug. 2006 -> April 2007
Medspiration user meeting, dec 4-6
Presentation in Java and GoogleEarth
• www.satelliteeye.dk
•Todays analysis + other data
• ocean.dmi.dk
•30 days archive and animations
Medspiration user meeting, dec 4-6
Validation of the SST observations and the analysis
• Validation period: 2 months, Sep, Oct, 2006, North Atlantic Area
• In situ observations: Argo floats and buoy obs from GTS network.
• Nighttime satellite data
• Daily validation statistics produced
SST product N matchups
Bias Stderr
ATSR 330 0.12 0.36
SAF, NAR 28985 -0.22 0.77
AMSR-E 25121 -0.02 0.72
MODIS-A 36359 -0.76 1.2
NAVO-LAC 25583 -0.02 0.72
NAVO_GAC 16628 -0.02 0.67
OI SST NATL 47110 0.02 0.70
Medspiration user meeting, dec 4-6
Applications and future Applications• ”Assimilated” into the HYCOM
model of the North AtlanticFuture• Compare with OSTIA and
Medspiration analysis using DDS • Improve statistics near ice• Reference all satellite data to
one satellite (AATSR ?) • to make a very high resolution
Greeland/Arctic product
Medspiration user meeting, dec 4-6
MCS L4 SST products ? Arctic L4 from DMI and met.no
• Challenging with L4 SST analysis in the presence of ice and close to ice edges, with temporally dependent statistics along with changing ice extent
• Met.no and DMI have expertise and observations from the operational ice mapping services and with high latitude SST and level 4 generation
• Full arctic coverage with special emphasis on the Nordic Seas, Greenland waters (DMI) and around Svalbard + Barents Sea (Met.no)
• Data in full resolution from SAF O&SI and Medspiration/GHRSST follow on: AVHRR, AATSR, METOP, AMSRE and ice products
• Include Sea ice temperature ? when/if level 2 data will be available.
• Need for coordination and sharing of knowledge with other regional level 4 products
Medspiration user meeting, dec 4-6
Conclusions and Feedback
• Important with regional high resolution level 4 analysis, using regional covariances and error statistics.
• Ice information important and statistics in vicinity of ice
Feedback• Very nice with the common data format, continue please !! • Delay of several days on the AMSRE data • Elevated errors on Modis Aqua data ? • AATSR data look very good, but few measurements• Different quality flags, AATSR vs. e.g. AVHRR • Seviri 5 km hourly nighttime data look good