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| Titel |
Characterisation and quantification of regional diurnal SST cycles from SEVIRI |
| VerfasserIn |
I. Karagali, J. L. Høyer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 10, no. 5 ; Nr. 10, no. 5 (2014-09-02), S.745-758 |
| Datensatznummer |
250117065
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| Publikation (Nr.) |
 copernicus.org/os-10-745-2014.pdf |
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| Zusammenfassung |
| Hourly SST (sea surface temperature) fields from the geostationary Spinning Enhanced Visible
and Infrared Imager (SEVIRI) offer a unique opportunity for the
characterisation and quantification of the diurnal cycle of SST in
the Atlantic Ocean, the Mediterranean Sea and the northern European
shelf seas. Six years of SST fields from SEVIRI are
validated against the Advanced Along-Track Scanning Radiometer (AATSR)
Reprocessed for Climate (ARC) data set. The overall SEVIRI–AATSR bias is
−0.07 K, and the standard deviation is 0.51 K,
based on more than 53 × 106 match-ups.
Identification of the diurnal signal requires an SST foundation
temperature field representative of well-mixed conditions which
typically occur at night-time or under moderate and strong winds.
Such fields are generated from the SEVIRI archive and are validated
against pre-dawn SEVIRI SSTs and night-time SSTs from drifting buoys.
The different methodologies tested for the foundation temperature
fields reveal variability introduced by averaging night-time SSTs
over many days compared to single-day, pre-dawn values. Diurnal
warming is most pronounced in the Mediterranean and Baltic seas
while weaker diurnal signals are found in the tropics. Longer
diurnal warming duration is identified in the high latitudes
compared to the tropics. The maximum monthly mean diurnal signal
can be up to 0.5 K in specific regions. |
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