Convective Rainfall in Lake Victoria Watershed and Adjacent Equatorial Africa 被引量：2

Convective Rainfall in Lake Victoria Watershed and Adjacent Equatorial Africa

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摘要 An integrated satellite precipitation estimation dataset, namely, the Climate Prediction Center morphing method (CMORPH), was used to analyze precipitation regimes across Equatorial Africa between 3°S - 1°N and 24°E - 42°E from 2000 to 2014. This region includes the Rift Valley, part of the Congo Forest, and the Lake Victoria (LV) basin, the second largest lake in the area of the world. Hovmöller diagrams were obtained for all organized convective systems to estimate their spans, duration, and phase speeds. The analysis included 33,189 episodes of westward propagating convective systems. Within the study area, lake and land breezes tend to trigger convection and precipitation over LV as well as mountain-valley circulation trigger thunderstorms over the mountains east of LV and western Rift Valley. The statistics of convective systems streaks on longitude-time diagrams were obtained for yearly frequencies of starting and ending longitudes and times among other morphologic variables. Results indicate organized precipitation episodes tend to move westward across Rift valley and Congo forest with an average phase speed of 10.3 m·s-1. More than 50% of them are triggered over LV and propagate more than 600 km at an average phase speed of 12.1 m·s-1. These convective systems tend to produce high rainfall rates hundreds of kilometers away into the Congo Forest. Half of all episodes of organized convection analyzed have phase speeds between 8 m·s-1 and 16 m·s-1, lasting 8 hr to 16 hr. Most precipitating systems start east of LV and west of Rift Valley in the afternoon to early morning and propagates less than 400 km. Finally, hourly precipitation accumulation and lightning density analysis indicate three preferable regions for convective initiation: 1) The mountain range east of LV;2) Midwest of LV, and;3) The Congo Forest mountain range. An integrated satellite precipitation estimation dataset, namely, the Climate Prediction Center morphing method (CMORPH), was used to analyze precipitation regimes across Equatorial Africa between 3°S - 1°N and 24°E - 42°E from 2000 to 2014. This region includes the Rift Valley, part of the Congo Forest, and the Lake Victoria (LV) basin, the second largest lake in the area of the world. Hovmöller diagrams were obtained for all organized convective systems to estimate their spans, duration, and phase speeds. The analysis included 33,189 episodes of westward propagating convective systems. Within the study area, lake and land breezes tend to trigger convection and precipitation over LV as well as mountain-valley circulation trigger thunderstorms over the mountains east of LV and western Rift Valley. The statistics of convective systems streaks on longitude-time diagrams were obtained for yearly frequencies of starting and ending longitudes and times among other morphologic variables. Results indicate organized precipitation episodes tend to move westward across Rift valley and Congo forest with an average phase speed of 10.3 m·s-1. More than 50% of them are triggered over LV and propagate more than 600 km at an average phase speed of 12.1 m·s-1. These convective systems tend to produce high rainfall rates hundreds of kilometers away into the Congo Forest. Half of all episodes of organized convection analyzed have phase speeds between 8 m·s-1 and 16 m·s-1, lasting 8 hr to 16 hr. Most precipitating systems start east of LV and west of Rift Valley in the afternoon to early morning and propagates less than 400 km. Finally, hourly precipitation accumulation and lightning density analysis indicate three preferable regions for convective initiation: 1) The mountain range east of LV;2) Midwest of LV, and;3) The Congo Forest mountain range.

作者 Felipe Vemado Augusto José Pereira Filho Felipe Vemado;Augusto José Pereira Filho(Departmento de Ciências Atmosféricas, Instituto de Astronomia, Geofísica e Ciências Atmosféricas, Universidade de São Paulo, São Paulo, Brazil)

机构地区 Departmento de Ciências Atmosféricas o Paulo o Paulo

出处《Atmospheric and Climate Sciences》 2021年第3期373-397,共25页 大气和气候科学（英文）

关键词 Lake Victory Precipitation Deep Convection Diurnal Cycle CMORPH Lake Victory Precipitation Deep Convection Diurnal Cycle CMORPH

分类号 O17 [理学—基础数学]

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1Augusto J. Pereira Filho,Richard E. Carbone,John D. Tuttle,Hugo A. Karam.Convective Rainfall in Amazonia and Adjacent Tropics[J].Atmospheric and Climate Sciences,2015,5(2):137-161. 被引量：2
2Augusto J. Pereira Filho,Richard E. Carbone,John D. Tuttle.Convective Rainfall Systems in the La Plata Basin[J].Atmospheric and Climate Sciences,2014,4(4):757-778. 被引量：1

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1Hugo Abi Karam,Jorge Fernando Soares Gonçalves,Augusto José Pereira Filho.Diurnal Cycle of Heating and Water Vapor in the Metropolitan Area of Porto in Portugal[J].Journal of Geographic Information System,2022,14(1):61-77.

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1Richard Ayodeji Balogun,Vincent Olanrewaju Ajayi,Ifeoluwa Adebowale Balogun.Local Impacts and Surface Characteristics of Cold Pools Wind Gust Observed from Thunderstorm[J].Atmospheric and Climate Sciences,2022,12(4):679-697.
2Hugo Abi Karam,Jorge Fernando Soares Gonçalves,Augusto José Pereira Filho.Diurnal Cycle of Heating and Water Vapor in the Metropolitan Area of Porto in Portugal[J].Journal of Geographic Information System,2022,14(1):61-77.

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