A5078010794- Climate variability and models
- Mathematical and Theoretical Epidemiology and Ecology Models
- Evolution and Genetic Dynamics
- Animal Ecology and Behavior Studies
- Precipitation Measurement and Analysis
- Meteorological Phenomena and Simulations
- Atmospheric chemistry and aerosols
- Plant Water Relations and Carbon Dynamics
- Solar Radiation and Photovoltaics
- Evolutionary Game Theory and Cooperation
- Ecosystem dynamics and resilience
- Hydrology and Drought Analysis
- Geophysics and Gravity Measurements
- Atmospheric and Environmental Gas Dynamics
- Soil Moisture and Remote Sensing
- Polar Research and Ecology
- Climate change impacts on agriculture
- Cryospheric studies and observations
- Air Quality and Health Impacts
- Quality and Supply Management
- Atmospheric aerosols and clouds
- Hydrology and Watershed Management Studies
- Plant responses to elevated CO2
- Agriculture and Rural Development Research
- Wind Energy Research and Development
Kwame Nkrumah University of Science and Technology
2015-2025
National Institute of Meteorology
2022-2025
Uganda National Meteorological Authority
2025
Kwame Nkrumah University
2022-2024
Oregon Health Authority
2017
Clarkson University
2015-2017
Federal University of Technology
2015
Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung
2005
The terrestrial land surface in West Africa is made up of several types savanna ecosystems differing use changes which modulate gas exchanges between their vegetation and the overlying atmosphere. This study compares diurnal seasonal estimates CO2 fluxes from three contrasting ecosystems, a grassland, mixture fallow cropland, nature reserve Sudanian Savanna relate them to water availability characteristics.Over period, for sites, low soil moisture availability, high vapour pressure deficit...
The Ghana Meteorological Agency delineated Ghana’s geographical space into four agro-climatic zones namely the north, transition, forest and coastal zones. Since demarcation in 1960s, previous studies have rarely provided a more dis-aggregated zone map tandem with contemporary climate change variability. continued use of this age-old classified is disservice to public. In study, therefore, we evaluated existing reconstructed it appropriate that reflect current variability impact. This was...
Massive post‐depositional processes alter the nitrate concentration in polar firn where annual snow accumulation is low. This hinders a direct atmospheric interpretation of ice core record. Fractionation isotopes during loss may allow estimating amount past. We measured δ 15 N two Antarctic surface cores from Dome C area. In concert with known decrease depth we observe an increase isotopic signature. Assuming Rayleigh type process find isotope effect ɛ = −54‰. fractionation factor for...
The performances of both sunshine and air temperature dependent models for the estimation global solar radiation (GSR) over Ghana other tropical regions were evaluated a comparison assessment was carried out using measured GSR at Owabi (6°45′0′′N, 1°43′0′′W) in Ashanti region Ghana. Furthermore, an empirical model which also uses hours measurements from study site its environs proposed. results showed that all could predict very well pattern monthly daily mean entire period study. However,...
Abstract Rain‐fed agriculture is predominantly the primary source of livelihood in sub‐Saharan Africa. In Ghana, it employs over 60% population and contributes to about 30% Gross Domestic Product (GDP). Despite relevance rain‐fed socioe‐conomic development country, studies investigating impacts climate variability on crop yield region are limited. This prevents growth relevant policy frameworks address threats posed by production. As a contribution guide planning food security present study...
Climate extreme events affect people whose livelihoods are reliant on the water resources of Volta Basin in West Africa. Therefore, decision-makers and policymakers need reliable predictions these extremes several time scales to develop an Early Warning System (EWS) combat devastating impact climatic events. In that vein, study evaluated performance 41 models from Coupled Model Intercomparison Project Phase 6 (CMIP6) simulating six (6) precipitation developed by Expert Team Change Detection...
Abstract Nitrogen dioxide (NO₂) is a critical air pollutant and key indicator for quality. Due to limited monitoring, we leveraged TROPOMI NO₂ NASA POWER meteorological datasets evaluate the drivers on tropospheric column concentrations develop predictive models levels over Ghana. Employing an 8:2 ratio model training testing, meteorology relationships were assessed by seasonality indices correlation analyses. Results indicate marked seasonal variability in columns, prominent during dry...
Cosmic Ray Neutron Sensors (CRNS) are pivotal in measuring field-scale soil moisture, but uncertainties persist due to traditional methods of scaling parameter estimation, which often fail consider site- and sensor-specific factors. This study integrates novel, data-driven approaches refine parameters for atmospheric pressure, air humidity incoming cosmic ray intensity (β, ψ, ω) using measurement data. We demonstrate the strong potential considerable improvents...
Abstract Methane (CH₄) is a major and potent greenhouse gas (GHG), its emissions from agricultural activities, particularly rice cultivation, are significant concern for climate change. Due to the high demand food security, driven by rapid population growth national initiatives reduce dependency on imports, cultivation intensified in West Africa. However, contribution atmospheric CH4 remains largely understood. Here, first time, cutting-edge eddy covariance tower measurements were conducted...
ABSTRACT Various sectors of the country's economy – agriculture, health, energy, among others largely depend on climate information, hence availability quality data is very essential for climate‐impact studies in these sectors. In this paper, a monthly rainfall database (GMet v1.0) has been developed at 0.5 ° × spatial resolution, from 113 Ghana Meteorological Agency (GMet) gauge network distributed across four agro‐ecological zones Ghana, and spanning 23‐year period (1990–2012). The...
Abstract. The main objective of this work is to investigate at regional scale the variability in burned areas over savannahs West Africa and their links with rainfall large-scale climatic indexes such as Southern Oscillation Index (SOI), Multivariate ENSO (MEI), North Atlantic (NAO) sea surface temperature gradient (SSTG). Daily satellite products (L3JRC) from SPOT Vegetation sensor a moderate spatial resolution 1 km x between 2000 2007 were analyzed African savannah paper. Results seasonal...
A selected number of global climate models (GCMs) from the fifth Coupled Model Intercomparison Project (CMIP5) were evaluated over Volta Basin for precipitation. Biases in computed by taking differences between averages period (1950–2004) and observation, normalized average observed annual seasonal timescales. The Community Earth System Model, version 1-Biogeochemistry (CESM1-BGC), Climate Version 4 (CCSM4), Max Planck Institute Medium Range (MPI-ESM-MR), Norwegian (NorESM1-M), multimodel...
Core Ideas A new hydrometeorological observatory was established for the Sudan Savanna. More than 30 variables in subhourly resolution are provided. Water, energy, and CO 2 fluxes monitored along a land use change gradient. The data form basis an improved impact assessment of environmental changes. It is excellent platform future field modeling studies West Africa. Watersheds with rich equipment still very limited Africa but essential analysis changes their impacts this region. This study...
Cannibalism is an intriguing life history trait, that has been considered primarily in the predator, predator–prey population models. Recent experimental evidence shows prey cannibalism can have a significant impact on dynamics natural communities. Motivated by these results, we investigate ratio-dependent Holling–Tanner model, where occurs simultaneously both predator and species. We show depending parameters, whilst or acting alone leads to instability, their joint effect actually...
Rainfall variability plays an important role in many socio-economic activities such as food security, livelihood and farming Ghana. impact studies are thus very crucial for proper management of these key sectors the country. This paper examines seasonal annual rainfall four agro-ecological zones Ghana from CHIRPS V2 time series spanning a period 1981-2015. The indices were computed with aid FClimDex package whereas trends further tested using Mann Kendall trend test. results show good...
The Pra river catchment in Ghana, West Africa. Knowledge of the spatio-temporal distribution wet and dry spells are crucial for rain-fed agriculture at River catchment. This study characterised their associated atmospheric dynamics Specifically, variability historical future on rainfall spell patterns were studied. Short duration have a higher occurrence as compared to long spells. Seasonally, short most common December–February, whereas expected March–May. Future scenarios show an increase...
Cosmic ray neutron sensors (CRNS) are increasingly used to determine field-scale soil moisture (SM). Uncertainty of the CRNS-derived strongly depends on CRNS count rate subject Poisson distribution. State-of-the-art signal processing averages counts over many hours, thereby accounting for temporal dynamics at daily but not sub-daily time scale. This study demonstrates methods improve accuracy in order observe changes and signal-to-noise ratio overall. In particular, this investigates...