In this paper,we present a new approach to the detection of Sea Breeze Fronts(SBF)in the Gulf of Guinea using automated methods.The study focuses on southern West Africa,where SBFs play a crucial role in local weather...In this paper,we present a new approach to the detection of Sea Breeze Fronts(SBF)in the Gulf of Guinea using automated methods.The study focuses on southern West Africa,where SBFs play a crucial role in local weather.The re-search demonstrates that the dynamic of SBFs exerts a significant influence on local weather conditions and acts as a favourable mechanism for convection.The aim of this study is to improve the effectiveness of conventional SBF de-tection techniques by applying an automated methodology through the analy-sis of images obtained by the second generation Meteosat(MSG)satellite.Our method,based on an active contour technique called morphological snake,is capable of automatically detecting the cumulus lines that are associated with SBF in a relatively short period of time using a substantial number of MSG images taken every 15 min.To delineate the SBFs and to model their inland propagation by isochrones,several regression methods were employed.Among these,the kernel-weighted local polynomial regression(kwLPR)provided the greatest accuracy in modeling the SBF propagation,with an average spatial root mean square error(RMSE)of only 0.0034˚.The SBF penetrated as far as 100 to 146.3 km inland at certain longitudes.Its average penetration along the coast is 103.17 km.The algorithm is highly robust and has a wide range of practical ap-plications,including automatic pattern recognition and dynamic imaging.Fur-thermore,it has significant potential for future research into other complex phe-nomena,such as the propagation of pollutants and other atmospheric particles.展开更多
基金the BMBF(“Bundesministerium für Bildung und Forschung”)for funding the PhD research of Thomas D.Allagbe through FURIFLOOD Research Project(“Current and future risks of urban and rural flooding in West Africa”,Grant No.:01LG2086B)under the West African Science Service Center on Climate Change and Adapted Land Use(WASCAL)programWe would like to thank the advisors and examiners for their valuable contributions and comments,in particular Prof Andreas H.Fink and Dr Marlon Maranan from Karlsruhe Institute of Technology(Germany),and the anonymous researchers of FURIFLOOD.
文摘In this paper,we present a new approach to the detection of Sea Breeze Fronts(SBF)in the Gulf of Guinea using automated methods.The study focuses on southern West Africa,where SBFs play a crucial role in local weather.The re-search demonstrates that the dynamic of SBFs exerts a significant influence on local weather conditions and acts as a favourable mechanism for convection.The aim of this study is to improve the effectiveness of conventional SBF de-tection techniques by applying an automated methodology through the analy-sis of images obtained by the second generation Meteosat(MSG)satellite.Our method,based on an active contour technique called morphological snake,is capable of automatically detecting the cumulus lines that are associated with SBF in a relatively short period of time using a substantial number of MSG images taken every 15 min.To delineate the SBFs and to model their inland propagation by isochrones,several regression methods were employed.Among these,the kernel-weighted local polynomial regression(kwLPR)provided the greatest accuracy in modeling the SBF propagation,with an average spatial root mean square error(RMSE)of only 0.0034˚.The SBF penetrated as far as 100 to 146.3 km inland at certain longitudes.Its average penetration along the coast is 103.17 km.The algorithm is highly robust and has a wide range of practical ap-plications,including automatic pattern recognition and dynamic imaging.Fur-thermore,it has significant potential for future research into other complex phe-nomena,such as the propagation of pollutants and other atmospheric particles.
