SEVIRI rainfall retrieval and validation using weather radar observations
Identifieur interne : 000328 ( PascalFrancis/Curation ); précédent : 000327; suivant : 000329SEVIRI rainfall retrieval and validation using weather radar observations
Auteurs : R. A. Roebeling [Pays-Bas] ; I. Holleman [Pays-Bas]Source :
- Journal of geophysical research [ 0148-0227 ] ; 2009.
Descripteurs français
- Pascal (Inist)
- Pluie, Validation, Radar météorologique, Observation radar, Algorithme, Nuage, Intensité pluie, Propriété physique, Précipitation atmosphérique, Particule, Rayon effectif, Thermodynamique, Sommet nuage, Hauteur, Pluviomètre, Corrélation, Instrumentation, Dimension particule, Détection, Variance, Pixel, Précision, Erreur systématique, Echantillon référence, Réseau radar météorologique, Pays Bas.
- Wicri :
- topic : Thermodynamique.
English descriptors
- KwdEn :
- Bias, Cloud top, Effective radius, Height, Meteorological radar, Netherlands, Particle size, Pixel, Radar observation, Rain gauge, Rainfall rate, Validation, Variance, Wheather radar network, accuracy, algorithms, atmospheric precipitation, clouds, correlation, detection, instruments, particles, physical properties, rainfall, standard samples, thermodynamics.
Abstract
[1] This paper presents and validates a new algorithm to detect precipitating clouds and estimate rain rates from cloud physical properties retrieved from the Spinning Enhanced Visible and Infrared Imager (SEVIRI). The precipitation properties (PP) algorithm uses information on cloud condensed water path (CWP), particle effective radius, and cloud thermodynamic phase to detect precipitating clouds, while information on CWP and cloud top height is used to estimate rain rates. An independent data set of weather radar data is used to determine the optimum settings of the PP algorithm and calibrated it. For a 2-month period, the ability of SEVIRI to discriminate precipitating from nonprecipitating clouds is evaluated using weather radar over the Netherlands. In addition, weather radar and rain gauge observations are used to validate the SEVIRI retrievals of rain rate and accumulated rainfall across the entire study area and period. During the observation period, the spatial extents of precipitation over the study area from SEVIRI and weather radar are highly correlated (correlation ≃ 0.90), while weaker correlations (correlation ≃ 0.63) are found between the spatially mean rain rate retrievals from these instruments. The combined use of information on CWP, cloud thermodynamic phase, and particle size for the detection of precipitation results in an increase in explained variance (∼10%) and decrease in false alarms (∼15%), as compared to detection methods that are solely based on a threshold CWP. At a pixel level, the SEVIRI retrievals have an acceptable accuracy (bias) of about 0.1 mm h-1 and a precision (standard error) of about 0.8 mm h-1. It is argued that parts of the differences are caused by collocation errors and parallax shifts in the SEVIRI data and by irregularities in the weather radar data. In future studies we intend to exploit the observations of the European weather radar network Operational Programme for the Exchange of Weather Radar Information (OPERA) and extend this study to the entirety of Europe.
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<front><div type="abstract" xml:lang="en">[1] This paper presents and validates a new algorithm to detect precipitating clouds and estimate rain rates from cloud physical properties retrieved from the Spinning Enhanced Visible and Infrared Imager (SEVIRI). The precipitation properties (PP) algorithm uses information on cloud condensed water path (CWP), particle effective radius, and cloud thermodynamic phase to detect precipitating clouds, while information on CWP and cloud top height is used to estimate rain rates. An independent data set of weather radar data is used to determine the optimum settings of the PP algorithm and calibrated it. For a 2-month period, the ability of SEVIRI to discriminate precipitating from nonprecipitating clouds is evaluated using weather radar over the Netherlands. In addition, weather radar and rain gauge observations are used to validate the SEVIRI retrievals of rain rate and accumulated rainfall across the entire study area and period. During the observation period, the spatial extents of precipitation over the study area from SEVIRI and weather radar are highly correlated (correlation ≃ 0.90), while weaker correlations (correlation ≃ 0.63) are found between the spatially mean rain rate retrievals from these instruments. The combined use of information on CWP, cloud thermodynamic phase, and particle size for the detection of precipitation results in an increase in explained variance (∼10%) and decrease in false alarms (∼15%), as compared to detection methods that are solely based on a threshold CWP. At a pixel level, the SEVIRI retrievals have an acceptable accuracy (bias) of about 0.1 mm h<sup>-1</sup>
and a precision (standard error) of about 0.8 mm h<sup>-1</sup>
. It is argued that parts of the differences are caused by collocation errors and parallax shifts in the SEVIRI data and by irregularities in the weather radar data. In future studies we intend to exploit the observations of the European weather radar network Operational Programme for the Exchange of Weather Radar Information (OPERA) and extend this study to the entirety of Europe.</div>
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<fC01 i1="01" l="ENG"><s0>[1] This paper presents and validates a new algorithm to detect precipitating clouds and estimate rain rates from cloud physical properties retrieved from the Spinning Enhanced Visible and Infrared Imager (SEVIRI). The precipitation properties (PP) algorithm uses information on cloud condensed water path (CWP), particle effective radius, and cloud thermodynamic phase to detect precipitating clouds, while information on CWP and cloud top height is used to estimate rain rates. An independent data set of weather radar data is used to determine the optimum settings of the PP algorithm and calibrated it. For a 2-month period, the ability of SEVIRI to discriminate precipitating from nonprecipitating clouds is evaluated using weather radar over the Netherlands. In addition, weather radar and rain gauge observations are used to validate the SEVIRI retrievals of rain rate and accumulated rainfall across the entire study area and period. During the observation period, the spatial extents of precipitation over the study area from SEVIRI and weather radar are highly correlated (correlation ≃ 0.90), while weaker correlations (correlation ≃ 0.63) are found between the spatially mean rain rate retrievals from these instruments. The combined use of information on CWP, cloud thermodynamic phase, and particle size for the detection of precipitation results in an increase in explained variance (∼10%) and decrease in false alarms (∼15%), as compared to detection methods that are solely based on a threshold CWP. At a pixel level, the SEVIRI retrievals have an acceptable accuracy (bias) of about 0.1 mm h<sup>-1</sup>
and a precision (standard error) of about 0.8 mm h<sup>-1</sup>
. It is argued that parts of the differences are caused by collocation errors and parallax shifts in the SEVIRI data and by irregularities in the weather radar data. In future studies we intend to exploit the observations of the European weather radar network Operational Programme for the Exchange of Weather Radar Information (OPERA) and extend this study to the entirety of Europe.</s0>
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<fC07 i1="02" i2="2" l="FRE"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="ENG"><s0>Europe</s0>
<s2>564</s2>
</fC07>
<fC07 i1="02" i2="2" l="SPA"><s0>Europa</s0>
<s2>564</s2>
</fC07>
<fN21><s1>018</s1>
</fN21>
<fN44 i1="01"><s1>OTO</s1>
</fN44>
<fN82><s1>OTO</s1>
</fN82>
</pA>
</standard>
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