A5054041415- Climate variability and models
- Precipitation Measurement and Analysis
- Meteorological Phenomena and Simulations
- Atmospheric aerosols and clouds
- Hydrology and Drought Analysis
- Atmospheric chemistry and aerosols
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- Atmospheric Ozone and Climate
- Flood Risk Assessment and Management
- Underwater Vehicles and Communication Systems
- Solar Radiation and Photovoltaics
- Science and Climate Studies
- Underwater Acoustics Research
- Energy Load and Power Forecasting
- Soil Geostatistics and Mapping
- Landslides and related hazards
- Air Quality Monitoring and Forecasting
- Delphi Technique in Research
- Opportunistic and Delay-Tolerant Networks
- Oceanographic and Atmospheric Processes
- Plant Water Relations and Carbon Dynamics
- Computational Physics and Python Applications
- Remote Sensing in Agriculture
- Soil Moisture and Remote Sensing
Karlsruhe Institute of Technology
2017-2025
Obafemi Awolowo University
2019
Ghana Meteorological Agency
2019
Nigerian Meteorological Agency
2019
Abstract The European Union (EU)-funded project Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) investigates the relationship between weather, climate, and air pollution southern Africa—an area with rapid population growth, urbanization, an increase anthropogenic aerosol emissions. over this region contains a unique mixture of natural gases, liquid droplets, particles, emitted environment which multilayer clouds frequently form. These exert large influence on local...
Abstract. In June and July 2016 the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project organised a major international field campaign southern (SWA) including measurements from three inland ground supersites, urban sites Cotonou Abidjan, radiosondes, research aircraft. A significant range of different weather situations were encountered during this period, monsoon onset. The purpose paper is to characterise large-scale setting for as well synoptic mesoscale...
Southern West Africa (SWA) is characterised by a wide range of rainfall types, the relative importance which have never been quantified on regional level. Here, we use 16 years three‐dimensional reflectivity data from Tropical Rainfall Measuring Mission–Precipitation Radar (TRMM‐PR) to objectively distinguish between seven different types in three subregions SWA. Highly organized Mesoscale Convective System (MCS) events are dominating rain‐bearing systems They tend occur highly sheared...
Abstract Using a two-year dataset (2016–17) from 17 one-minute rain gauges located in the moist forest region of Ghana, performance Integrated Multisatellite Retrievals for GPM, version 6b (IMERG), is evaluated based on subdaily time scale, down to level underlying passive microwave (PMW) and infrared (IR) sources. Additionally, spaceborne cloud product Cloud Property Dataset SEVIRI, edition 2 (CLAAS-2), available every 15 min, used link IMERG rainfall cloud-top properties. Several important...
Abstract Rain gauge data sparsity over Africa is known to impede the assessments of hydrometeorological risks and skill numerical weather prediction models. Satellite rainfall estimates (SREs) have been used as surrogate fields for a long time are continuously replaced by more advanced algorithms new sensors. Using unique daily dataset from 36 stations across equatorial East period 2001–18, this study performs multiscale evaluation gauge-calibrated SREs, namely, IMERG, TMPA, CHIRPS, MSWEP...
Abstract. During the monsoon season, pollutants emitted by large coastal cities and biomass burning plumes originating from central Africa have complex transport pathways over southern West (SWA). The Dynamics–Aerosol–Chemistry–Cloud Interactions in (DACCIWA) field campaign has provided numerous dynamical chemical measurements around super-site of Savè Benin (≈185 km away coast), which allows quantification relative contribution advected pollutants. Through combination situ ground with...
Abstract An intense mesoscale convective system (MCS) in the Guinea Coast region caused one of highest ever recorded daily rainfall amounts at Nigerian station Abakaliki on 12 June 2016 (223.5 mm). This paper provides a detailed analysis meso- and synoptic-scale factors leading to this event, including some so far undocumented dynamical aspects for southern West Africa. The MCS formed over Darfur Mountains due diurnal heating, then moved southwestward along mid- lower-tropospheric trough,...
Due to its vast size, Lake Victoria in East Africa significantly impacts the region’s climate through lake breezes, which influence convective activity, and thus precipitation, as well air pollution quality coastal cities. These with their leading edges known lake-breeze fronts (LBF), affect local regional weather by initiating deep moist convection, even during dry months of December-February (DJF) June-August (JJA). This can lead heavy precipitation inland or over lake, resulting...
Abstract Precipitation gauging networks have been declining in many developing countries such as South Africa. Satellite precipitation and reanalysis data products (SPPs) shown vast improvements over the last 5 years are postulated to mitigate lack of ground-based observations. The Western Cape Africa has recently experienced a devastating drought (2015–2018) consecutive local floods (2023/2024) but lacks sufficient observations fully conceptualize impacts these climatic extremes. Using...
Abstract During the DACCIWA (Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa) field campaign ∼900 radiosondes were launched from 12 stations southern Africa 15 June to 31 July 2016. Subsequently, data‐denial experiments conducted using Integrated Forecasting System of European Centre for Medium‐range Weather Forecasts (ECMWF) assess radiosondes' impact on quality analyses and forecasts. As observational reference, satellite‐based estimates rainfall outgoing long‐wave radiation...
After an exceptionally wet October 2019, the city of Bafoussam in Cameroon Highlands was hit by a devastating landslide on 29 October, resulting around 50 deaths. This study examines atmospheric drivers leading up to this fatal event sub-monthly scale. Leveraging long-term station rainfall data from and nearby Dschang, three marked spells during 2019 are identified, multi-day amounts which exceed maximum value within historical stations. Using ERA5 reanalysis European Centre for Medium-Range...
Abstract Reliable and accurate weather forecasts, particularly those of rainfall its extremes, have the potential to improve living conditions in densely populated southern West Africa (SWA). The limited availability observations has long impeded a rigorous evaluation current state‐of‐the‐art forecast models. field campaign Dynamics‐Aerosol‐Chemistry‐Cloud Interactions (DACCIWA) project June–July 2016 created an unprecedentedly dense set measurements from surface stations radiosondes. Here...
<p>Using a two-year dataset (2016–17) from 17 one-minute rain gauges located in the moist forest region of Ghana, performance Integrated Multisatellite Retrievals for GPM, version 6b (IMERG), is evaluated based on subdaily time scale, down to level underlying passive microwave (PMW) and infrared (IR) sources. Additionally, spaceborne cloud product Cloud Property Dataset Using SEVIRI, edition 2 (CLAAS-2), available every 15 minutes, used link IMERG rainfall...
Abstract Heatwaves and droughts increasingly impact public health societal system in a world subject to global warming. Several studies reported these phenomena all around the world, but there is dearth of research specifically West Africa. This study fills that gap by comparing heatwave/heat stress drought occurrence three climate zones (Guinea, Sudan Sahel) Africa from 1981 2020. The analysis focuses on comparison station gridded datasets. Cumulative Excess Heat (CumHeat) Universal Thermal...
Abstract The spatial description of high-resolution extreme daily rainfall fields is challenging because the high and temporal variability rainfall, particularly in tropical regions due to stochastic nature convective rainfall. Geostatistical simulations offer a solution this problem. In study, geostatistical simulation technique based on spectral turning bands method presented for modeling extremes data-scarce Ouémé River basin (Benin). This uses meta-Gaussian frameworks built Gaussian...
Abstract Current numerical weather prediction models show limited skill in predicting low-latitude precipitation. To aid future improvements, be it with better dynamical or statistical models, we propose a well-defined benchmark forecast. We use the arguably best currently high-resolution, gauge-calibrated, gridded precipitation product, Integrated Multi-Satellite Retrievals for GPM (Global Precipitation Measurement) (IMERG) “final run” ± 15-day window around date of interest to build an...
Abstract. In June and July 2016 the Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa (DACCIWA) project organised a major international field campaign southern (SWA) including measurements from three inland ground supersites, urban sites Cotonou Abidjan, radiosondes research aircraft. A significant range of different weather situations was encountered during this period, monsoon onset. The purpose paper is to characterise large-scale setting for as well synoptic mesoscale systems...
Abstract. During the monsoon season, pollutants emitted by large coastal cities and biomass burning plumes originating from Central Africa have complex transport pathways over Southern West (SWA). The Dynamics–Aerosol–Chemistry–Cloud–Interactions in (DACCIWA) field campaign has provided numerous dynamical chemical measurements around super site of Savè Benin (≈ 185 km away coast), which allows quantifying relative contribution advected pollutants. Through combination in-situ...
Abstract Despite the enormous potential of precipitation forecasts to save lives and property in Africa, low skill has limited their uptake. To assess improve performance forecast, validation postprocessing should continuously be carried out. Here, we evaluate quality reforecasts from European Centre for Medium-Range Weather Forecasts over equatorial East Africa (EEA) against satellite rain gauge observations period 2001–18. The 24-h rainfall accumulations are analyzed short- medium-range...
Abstract Using half-hourly rainfall data from 14 automated weather stations over central Africa, events [≥0.1 mm (30 min) −1 ] characteristics are explored. A total of 10 096 wet (WEs) were identified and classified into six storm types (STs), mostly discretized by their duration intensity. ST 1 is very short (<1.5 h) with low intensities a small area contributes the least to (7%) but far most frequent (70% WEs). 2 (∼1.5 sudden intense rains medium spatial scale (<200 km). 3 too...
&lt;p&gt;Rainfall variability over West Africa remains a major challenge for numerical weather prediction (NWP). Due to the largely stochastic and sub-grid nature of tropical convection, current NWP models still fail provide reliable precipitation forecasts &amp;#8211; even 1-day leadtime are barely more skillful than climatology-based forecasts. Thus, several recent studies have investigated presumably predictable influence waves on environmental conditions convection found...
West Africa is one of the most data-poor regions in world. In-situ precipitation observations are not available for many sites or contain data gaps, thus leading to uncertainties and biases hydrological studies this region. To address fundamental problem, we present a straightforward stochastic approach based on turning bands simulate daily fields. Our meta-Gaussian frameworks that generate Gaussian random fields, which transformed into "real-world" fields using transfer functions. The...
Tropical waves, particularly convectively coupled equatorial waves (CCEWs), are known to modulate rainfall in tropical Africa on intraseasonal down convective time scales, the latter of which includes dynamics heavy events. Data scarcity large parts Africa, especially has long prevented a clearer picture regional variability extreme rainfall. Thus, making use globally gridded satellite data and unique in-situ dataset for Cameroon, this study aims systematic comparison role occurrence intense...