Transcript oiswww.eumetsat.org

APPLICATIONS OF
METEOSAT SECOND
GENERATION (MSG)
Sea Surface temperature (SST)
Author: Pirkko Pylkkö (Finnish Meteorological Institute)
[email protected]
Sep 2005
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Sea Surface Temperature (SST)
background
MSG channels 3.9, 10.8 and 12.0 µm are used in the SST
algorithms.
OSI SAF SST definition (see http://www.osi-saf.org/) :
Subskin SST : Comparable to in situ (buoy) measurements at
night.
• Relation to bulk SST : equivalent to bulk SST by night. By
day, a bias of several Kelvin may be found under favourable
diurnal heating conditions.
• Relation to skin SST : by day and by night the subskin SST
is convertible to skin temperature by subtracting 0. 2K.
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Examples
of OSI SAF products
There are vast
areas of missing
information in the
3 hourly product
due to the cloud
cover
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Examples of OSI SAF products
12-hourly (combination of several timesteps) Mediterranean product.
• Meteosat-8 resolution is enough to show the SST in broad terms, but
not in detail
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Examples of OSI SAF products
12-hourly SST of Southern
Africa
• Meteosat-8 resolution is
favourable to Africa; some
of the largest eddies are seen
in the SST product
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Examples of MPEF SST products
MPEF SST South
Atlantic
Ocean and Indian Ocean
-Largest eddies can be
seen,
- Cloudiness is the cause
of large areas without
data
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Examples of MPEF SST products
• Example of MPEF
SST over the
Atlantic
• Two 3 hourly
timesteps of 3
hourly field
averages
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Examples of MPEF SST products
The SST is not
changing
dramatically, but the
apparent change in
the images is due to
the change in the
weather systems
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