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Seasonal And Diurnal Variation Of Surface Energy Fluxes And Surface Characteristics Over A Semiarid Grassland In West Africa

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  • Ayoola O., Oluwadare
  • Harald, Kunstmann
  • Esolomo J., Oluwadare
  • Jan, Bliefernicht

Abstract

Radiative fluxes and surface energy fluxes computed using the eddy covariance method from January to December 2013 were used to investigate the partition of energy and energy exchange over degraded grassland in the Sudanian savannah region of West Africa. In Sumbrungu Agunsi, (10.841°N, 0.918°W), in Ghana’s upper east area, an Eddy Covariance station was erected near to the Ghana–Burkina-Faso border. The fluctuations in radiation components, energy fluxes, and surface characteristics components were studied on a seasonal and daily basis. The Incoming shortwave radiation, out-going shortwave radiation, incoming long wave radiation and out-going long wave radiation all varied annually, resulting in a seasonal variation in net radiation. The soil moisture content, evaporative fraction, and the surface albedo were found to be low during the dry season but high during the wet season, while, the Bowen ratio was found to be high during the dry season but low during the wet season. During the wet season, majority of the available energy were converted to latent heat, but, during the dry season, majority of the available energy was transformed to sensible heat. The station’s energy balance closure was investigated; slope of the regression found was 0.67 with an intercept of 33 Wm-2 . The reasons for the station’s energy balance not being closed were investigated.

Suggested Citation

  • Ayoola O., Oluwadare & Harald, Kunstmann & Esolomo J., Oluwadare & Jan, Bliefernicht, 2022. "Seasonal And Diurnal Variation Of Surface Energy Fluxes And Surface Characteristics Over A Semiarid Grassland In West Africa," International Journal of Agriculture and Environmental Research, Malwa International Journals Publication, vol. 8(1), February.
    • Handle: RePEc:ags:ijaeri:333821
    DOI: 10.22004/ag.econ.333821
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    References listed on IDEAS

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    1. Christopher M. Taylor & Richard A. M. de Jeu & Françoise Guichard & Phil P. Harris & Wouter A. Dorigo, 2012. "Afternoon rain more likely over drier soils," Nature, Nature, vol. 489(7416), pages 423-426, September.
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    Environmental Economics and Policy;

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