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Characterisation and Quantification of Regional Diurnal Sst Cycles from Seviri : Volume 11, Issue 2 (07/04/2014)

By Karagali, I.

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Book Id: WPLBN0004020771
Format Type: PDF Article :
File Size: Pages 36
Reproduction Date: 2015

Title: Characterisation and Quantification of Regional Diurnal Sst Cycles from Seviri : Volume 11, Issue 2 (07/04/2014)  
Author: Karagali, I.
Volume: Vol. 11, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Høyer, J. L., & Karagali, I. (2014). Characterisation and Quantification of Regional Diurnal Sst Cycles from Seviri : Volume 11, Issue 2 (07/04/2014). Retrieved from

Description: DTU Wind Energy, Technical University of Denmark, Risø Campus, Building 125, Roskilde, 4000, Denmark. Hourly SST 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 the SEVIRI dataset are validated against the polar orbiting Advanced Along Track Scanning Radiometer (AATSR) archive to identify biases in the SEVIRI data. Identification of the diurnal signal requires a night-time SST field representative of foundation temperatures, i.e. well-mixed conditions and free of any diurnal signal. Such fields are generated from the SEVIRI archive and are validated against pre-dawn SEVIRI SSTs and night-time SSTs from drifting buoys. 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. 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 smallest diurnal signals are found in the Tropics. Longer diurnal warming duration is identified in the high latitudes compared to the Tropics. The mean diurnal signal of monthly mean SST can be up to 0.5° in specific regions.

Characterisation and quantification of regional diurnal SST cycles from SEVIRI

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