干旱区生态环境知识资源中心(Arid): Assessments of the night-time and daytime radiative fluxes balance on seasonal timescale over West Africa

Arid

DOI	10.1016/j.jastp.2019.05.012
	Assessments of the night-time and daytime radiative fluxes balance on seasonal timescale over West Africa
	Ojo, O. S.; Adeyemi, B.; Ogolo, E. O.
通讯作者	Ojo, O. S.
来源期刊	JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS
ISSN	1364-6826
EISSN	1879-1824
出版年	2019
卷号	191
英文摘要	The main aim of this paper is to assess the impact of climate change on variations and trends of the net radiation flux over West Africa during night and day time. West Africa was sub-divided into six climatic zones as classified by the World Meteorological Organization such as Hyper-Arid (HAR), Arid (ARD), Semi-Arid (SAR), Semi-Humid Dry (SHD), Semi-Humid Humid (SHH) and Humid (HUM) zones. To achieve this aim, thirty-six years' surface data of shortwave and longwave radiations between 1980 and 2015 were obtained from the Archives of the Modern-Era Retrospective Analysis for Research and Application, Version 2 (MERRA-2) database. Analyses showed that the maximum values of net radiative fluxes during the nighttime and daytime have the magnitude in watt per square metres of -70.00 and 225.82 in HAR zone, -62.46 and 248.99 in ARD zone, -51.71 and 304.88 in SAR zone, -40.55 and 334.58 in SHD zone, -34.32 and 352.62 in SHH zone and -30.49 and 362.68 in HUM zone respectively. The effect of population density, emission of greenhouse gas and surface albedo on net radiation was investigated over the climatic zones using the multivariate linear regression analysis. The results of the regression analysis showed that they have significant effects on net radiation. Also, the monotonic trend analysis between 1980 and 2015 was carried out using the non-parametric Mann- Kendall statistical test. The results of the trend test revealed that net radiation showed decreasing trends mainly in the humid zones at over 95% significance level while population density, emission of greenhouse gas and surface albedo showed significant increasing trends at the 99.9% level of significance. The analyses showed that the humid zones have higher values of net radiation, radiative cloud forcing, carbon-dioxide emission, population density and lower surface albedo than arid zones. Therefore, as signatures of climate change, it can be concluded that increase in population density, cloud amount and anthropogenic activities such as land use/land cover and emission of greenhouse gas have contributed greatly to the significant decreasing trends of the radiative flux balance especially in the humid zones of West Africa.
英文关键词	Net radiation Climatic zones Albedo Variations Statistics Trend Anthropogenic
类型	Article
语种	英语
国家	Nigeria
收录类别	SCI-E
WOS记录号	WOS:000480376200009
WOS关键词	ESTIMATING NET-RADIATION ; TROPICAL LOCATION ; ASSIMILATION ; SURFACE ; ATMOSPHERE ; CLIMATE ; NIGERIA ; GSI
WOS类目	Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences
WOS研究方向	Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216812
作者单位	Fed Univ Technol Akure, Dept Phys, PMB 704, Akure, Nigeria
推荐引用方式 GB/T 7714	Ojo, O. S.,Adeyemi, B.,Ogolo, E. O.. Assessments of the night-time and daytime radiative fluxes balance on seasonal timescale over West Africa[J],2019,191.
APA	Ojo, O. S.,Adeyemi, B.,&Ogolo, E. O..(2019).Assessments of the night-time and daytime radiative fluxes balance on seasonal timescale over West Africa.JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS,191.
MLA	Ojo, O. S.,et al."Assessments of the night-time and daytime radiative fluxes balance on seasonal timescale over West Africa".JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS 191(2019).