Original scientific paper
COMPARATIVE ASSESSMENT OF GROUND AND SATELLITE AEROSOL OBSERVATIONS OVER LAGOS-NIGERIA
MOSES ETERIGHO EMETERE
orcid.org/0000-0002-2968-8676
; Department of Physics, Covenant University Canaan land, P.M.B 1023, Otta, Nigeria
MOHAMMAD VALIPOUR
; Young Researchers and Elite Club, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran
Abstract
The performance of ground and satellite measuring sensors or devices in the West
Africa climate system is worrisome. These challenges had resulted in the loss of large volume of useful data on notable database e.g. Aerosol Robotic Network (AERONET), Multi-angle Imaging SpectroRadiometer (MISR), Modern-Era Retrospective Analysis for Research and Applications (MERRA) e.t.c. With only about 47% of data available to scientists, it is evident that accurate nowcast or forecast can no longer be guaranteed. The frequent failures of ground measuring
devices over West Africa are more systemic than error due to device fabrication. The optical state over Lagos-Nigeria was investigated using the aerosol model. Fourteen years aerosol dataset from MISR and two years aerosol dataset from AERONET were used for the study. The optical state over Lagos is significant due to the massive human population. Lagos is located within the latitude of 6.465 °N and longitude of 3.406 °E. The regression analysis and Mann-Kendall (MK) test show no significant trend and considerable relationship between satellite and ground data. The standard deviations of the optical state via satellite and ground observations are 0.131 and 0.233, respectively. The average optical state predictability of the satellite and ground observation was 14.2% and 53.1%, respectively. The atmospheric constants in Lagos are: a 1 = 1.175, a 2 = 0.8227,
n 1 = 0.2926, n 2 = 0.3573, and a = b = π/2.
Keywords
atmospheric constant; dispersion model; satellite observation; ground observation; aerosols; Lagos
Hrčak ID:
231264
URI
Publication date:
26.12.2019.
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