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Defining optimal brightness temperature simulation adjustment parameters to improve Metop-A/AVHRR SST over the Mediterranean Sea
Tomazic, Igor; Le Borgne, Pierre; Roquete, Hervé
2013The joint 2013 EUMETSAT Meteorological Satellite Conference and the 19th American Meteorological Society (AMS) Satellite Meteorology & Oceanography Conference
 

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Abstract :
[en] Sea surface temperature (SST) multispectral algorithms applied to infrared (IR) radiometer data exhibit regional biases due to the intrinsic inability of the SST algorithm to cope with the vast range of atmospheric types, mainly influenced by water vapor and temperature profiles. Deriving a SST correction from simulated brightness temperatures (BT), obtained by applying a Radiative Transfer Model (RTM) to Numerical Weather Prediction (NWP) atmospheric profiles and first guess SST, is one of the solutions to reduce regional biases. This solution is envisaged in the particular case of Metop-A Advanced Very High resolution (AVHRR) derived SST. Simulated BTs show errors, linked to RTM, atmospheric profiles or guess field errors. We investigated the conditions of adjusting simulated to observed BTs in the particular case of the Mediterranean Sea over almost one year. Our study led to define optimal spatio/temporal averaging parameters of the simulation observation differences, both during day and night and summer and colder season. Each BT adjustment has been evaluated by comparing the corresponding corrected AVHRR SST to the AATSR SST, that we adopted as validation reference. We obtained an optimized result across all defined conditions for a spatial smoothing of 15 deg and a temporal averaging between 3 and 5 days. Specifically, time series analyses showed that a standard deviation based criterion favors spatial smoothing above 10 deg for all temporal averaging, while a bias based criterion favors shorter temporal averaging during daytime (< 5 days) and higher spatial smoothing (>10 deg) for nighttime. This study has shown also the impact of diurnal warming both in deriving BT adjustment and in validation results, leading to more appropriate separate BT adjustment for day and night in areas and seasons of intensive diurnal warming conditions.
Research center :
AGO/GHER
Disciplines :
Earth sciences & physical geography
Author, co-author :
Tomazic, Igor ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Le Borgne, Pierre;  Météo-France > Centre de Meteorologie Spatiale, Lannion, France
Roquete, Hervé;  Météo-France > Centre de Météorologie Spatiale
Language :
English
Title :
Defining optimal brightness temperature simulation adjustment parameters to improve Metop-A/AVHRR SST over the Mediterranean Sea
Publication date :
2013
Event name :
The joint 2013 EUMETSAT Meteorological Satellite Conference and the 19th American Meteorological Society (AMS) Satellite Meteorology & Oceanography Conference
Event place :
Vienna, Austria
Event date :
from 16-09-2013 to 20-09-2013
Audience :
International
Name of the research project :
BELSPO STEREO II Inter-sensor Bias Estimation in Sea Surface Temperature (BESST) SR/12/158 and EUMETSAT Visiting Scientist program OSI_AS12_02
Commentary :
oral presentation
Available on ORBi :
since 12 April 2014

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