The city of Akure has experienced massive growth in population over the past 30 years. The increa... more The city of Akure has experienced massive growth in population over the past 30 years. The increased population has brought about modification in the land use and land cover leading to expansion in the urban area. This expansion has implications on the local climate of the area. This paper evaluates the urban expansion and its impact on Land Surface Temperature (LST) in the city of Akure from 1984 to 2014, using remote sensing and Geographic Information System (GIS) approach. Land use-land cover and change detection analysis were carried out for the period 1984 to 2014. Results showed that the urban settlement increased by 9709.62 hectares while the forested area decreased by 7347.2. The implication of the urban expansion on LST reveals an increase in the mean LST of the area (from 24.96 o C to 26.47 o C) with the highest LST value occurring at the city center due to limited vegetative surfaces within the area. The LST also increased across the different land uses and cover over the thirty years of study. In examining the relation between LST and vegetation, the NDVI and LST revealed a strong negative correlation (value of 0.94 and 0.924) between the two for each study period respectively. It is therefore imperative that with the increase in population and the corresponding increase in urban settlement, policies preserving vegetative surfaces (forested areas) should be implemented at every level.
This study presents the analysis of rainfall and temperature across the climatic zones in Nigeria... more This study presents the analysis of rainfall and temperature across the climatic zones in Nigeria. Data from ten Global Circulation Models (GCM) regridded to a 1° x 1° spatial resolution was used in this study. Model evaluation was carried out for the models using ground observed data from Nigerian Meteorological Agency (NIMET). Based on the comparison of the models with ground observed data, the ability of the models in simulating the seasonal pattern of precipitation and temperature over each climatic zone and the whole of Nigeria differ to different degrees. Of the four periods, June, July, August (JJA) showed the highest deviation. The seasonal variation of rainfall and temperature across the climatic zones revealed the influence of the Intertropical Discontinuity (ITD) in rainfall variation across each zone with dual rainfall peak over the Guinea. The rainfall distribution showed that Sahel recorded the lowest rainfall while guinea recorded the highest rainfall. Further analysis revealed that rainfall and temperature varied mostly in the sahel. The trend analysis of rainfall and temperature showed increasing trend in rainfall over the whole of Nigeria under RCP45 and RCP85. There was general increase in temperature for all RCPs across the zones and the whole of Nigeria. Further analysis revealed that sahel will experience more dry Original Research Article
This study aims at analyzing the influence of rainfall and temperature on Total Column Ozone (TCO... more This study aims at analyzing the influence of rainfall and temperature on Total Column Ozone (TCO) over West Africa. It provides adequate information on the spatial variability of total column ozone concentration, temperature distribution across latitudinal zones, monthly distribution and inter-annual variability of total ozone column and interrelationship between monthly ozone and distribution of precipitation rate over West Africa. The result of this work shows that, there are significant interconnectivities between total ozone column variability with precipitation and temperature. The correlation between Annual coefficient of Relative Variation (ACRV) of Total Column Ozone (TCO) with average annual temperature and average precipitation shows that there is correlation in ACRV of total ozone column trends over West Africa with temperature and precipitation. A strong positive value correlation was observed between the ACRV of ozone and average annual temperature which increases from 25°C to 29°C at the hot arid north of the region and the mean monthly maximum ozone Coincides with the tropical summer rainfall over West Africa between June and September, which showed that there is a significant relationship between rainfall and total ozone column over West Africa. Temperature and ozone tend to increase across the latitude while rainfall decreases across the latitude. These observations suggest significant Original Research Article
The city of Akure has experienced massive growth in population over the past 30 years. The increa... more The city of Akure has experienced massive growth in population over the past 30 years. The increased population has brought about modification in the land use and land cover leading to expansion in the urban area. This expansion has implications on the local climate of the area. This paper evaluates the urban expansion and its impact on Land Surface Temperature (LST) in the city of Akure from 1984 to 2014, using remote sensing and Geographic Information System (GIS) approach. Land use-land cover and change detection analysis were carried out for the period 1984 to 2014. Results showed that the urban settlement increased by 9709.62 hectares while the forested area decreased by 7347.2. The implication of the urban expansion on LST reveals an increase in the mean LST of the area (from 24.96 o C to 26.47 o C) with the highest LST value occurring at the city center due to limited vegetative surfaces within the area. The LST also increased across the different land uses and cover over the thirty years of study. In examining the relation between LST and vegetation, the NDVI and LST revealed a strong negative correlation (value of 0.94 and 0.924) between the two for each study period respectively. It is therefore imperative that with the increase in population and the corresponding increase in urban settlement, policies preserving vegetative surfaces (forested areas) should be implemented at every level.
This study presents the analysis of rainfall and temperature across the climatic zones in Nigeria... more This study presents the analysis of rainfall and temperature across the climatic zones in Nigeria. Data from ten Global Circulation Models (GCM) regridded to a 1° x 1° spatial resolution was used in this study. Model evaluation was carried out for the models using ground observed data from Nigerian Meteorological Agency (NIMET). Based on the comparison of the models with ground observed data, the ability of the models in simulating the seasonal pattern of precipitation and temperature over each climatic zone and the whole of Nigeria differ to different degrees. Of the four periods, June, July, August (JJA) showed the highest deviation. The seasonal variation of rainfall and temperature across the climatic zones revealed the influence of the Intertropical Discontinuity (ITD) in rainfall variation across each zone with dual rainfall peak over the Guinea. The rainfall distribution showed that Sahel recorded the lowest rainfall while guinea recorded the highest rainfall. Further analysis revealed that rainfall and temperature varied mostly in the sahel. The trend analysis of rainfall and temperature showed increasing trend in rainfall over the whole of Nigeria under RCP45 and RCP85. There was general increase in temperature for all RCPs across the zones and the whole of Nigeria. Further analysis revealed that sahel will experience more dry Original Research Article
This study aims at analyzing the influence of rainfall and temperature on Total Column Ozone (TCO... more This study aims at analyzing the influence of rainfall and temperature on Total Column Ozone (TCO) over West Africa. It provides adequate information on the spatial variability of total column ozone concentration, temperature distribution across latitudinal zones, monthly distribution and inter-annual variability of total ozone column and interrelationship between monthly ozone and distribution of precipitation rate over West Africa. The result of this work shows that, there are significant interconnectivities between total ozone column variability with precipitation and temperature. The correlation between Annual coefficient of Relative Variation (ACRV) of Total Column Ozone (TCO) with average annual temperature and average precipitation shows that there is correlation in ACRV of total ozone column trends over West Africa with temperature and precipitation. A strong positive value correlation was observed between the ACRV of ozone and average annual temperature which increases from 25°C to 29°C at the hot arid north of the region and the mean monthly maximum ozone Coincides with the tropical summer rainfall over West Africa between June and September, which showed that there is a significant relationship between rainfall and total ozone column over West Africa. Temperature and ozone tend to increase across the latitude while rainfall decreases across the latitude. These observations suggest significant Original Research Article
Uploads
Papers by Jola Daramola