Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Owoicho, Audu Moses; Nneka, Okeke Francisca

doi:10.22161/ijaers.5.9.39

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…It could be observed that TOC increases from the coastal region to the north eastern region of the country (Figure 1). This distribution is opposite to the rainfall pattern across Nigeria based on the two seasons experienced in the country [22]. The lowest value (259.1 -259.8 DU) for the period under study was observed in stations such as Calabar, Oyo, Port Harcourt, Delta, etc.…”

Section: Resultscontrasting

confidence: 68%

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Preliminary Investigation of Total Ozone Column and Its Relationship with Atmospheric Variables

Audu¹,

Emmanuel²,

Abi³

et al. 2023

ACS

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This study attempts to investigate the interaction between lower and upper atmosphere, employing daily data of Total Ozone Column (TOC) and atmospheric parameter (cloud cover) over Nigeria from 1998-2012; in order to study the dynamic effect of ozone on climate and vice versa. This is due to the fact that ozone and climate influence each other and the understanding of the dynamic effect of the interconnectivity is still an open research area. Monthly mean daily TOC and cloud cover data were obtained from the Earth Probe Total Ozone Mass Spectroscopy (EPTOMS) and the International Satellite Cloud Climatology Project (ISCCP)-D2 datasets respectively. Bivariate analysis and Mann Kendall trend tests were used in data analysis. MATLAB and ArcGIS software were employed in analyzing the data. Results reveal that TOC increased spatially from the coastal region to the north eastern region of the country. Seasonally, the highest value of TOC was observed at the peak of rainy season when cloud activity is very high, while the lowest value was recorded in dry season. These variations were attributed to rain producing mechanisms and atmospheric phenomena which influence the transport and distribution of ozone. Furthermore, the statistical analysis reveals significant relationship between TOC and low and middle cloud covers in contrast to high cloud cover. This relationship is consistent with previous studies using other atmospheric variables. This study has given scientific insight which is useful in understanding the coupling of the lower and upper atmosphere.

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Section: Resultscontrasting

confidence: 68%

“…It is pertinent to note that the seasonal variation of TOC (Figure 2) is similar to the variations of rainfall across Nigeria [22]. That is, heavy rainfall during the rainy season (April -October) with little or no rainfall during the dry season (November to March).…”

Section: Resultsmentioning

confidence: 56%

Preliminary Investigation of Total Ozone Column and Its Relationship with Atmospheric Variables

Audu¹,

Emmanuel²,

Abi³

et al. 2023

ACS

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Investigation of possible connections between solar activity and climate change in Nigeria

Audu

Okeke

2019

SN Appl. Sci.

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Over the years, several attempts were made to establish the possible link by which solar activity influenced climate change. However, the physical mechanism for these relationships has been the major challenge. In this research, we investigate the relationship between solar/geomagnetic activity and cosmic rays, the connection between cosmic rays and cloud covers and finally, cloud covers and climatic parameters. This is the proposed physical mechanism used in this study to investigate how solar activity influenced climate change in Nigeria. Sunspot number, aa index, galactic cosmic rays (GCRs), rainfall and maximum temperature data were used in this study. The time period under investigation in this study spanned for 63 years (1950-2012). Spearman's rank correlation technique was employed in analyzing the data. Results reveal that sunspot number and aa index varied in the opposite direction with GCRs based on the 11-year solar cycle. This inverse relationship was confirmed from the correlation analysis. This depicts that solar and geomagnetic activities modulate cosmic rays penetrating into the Earth's atmosphere. Furthermore, the relationship between cosmic rays and cloud covers is yet to be fully ascertained in this study. This has limited the proposed physical mechanism that this study hoped to establish. However, the variations of cloud covers with rainfall and temperature show that changes in cloud covers are associated with changes in rainfall and temperature. This study has given useful information on the possible links by which solar activity could influence climate change.

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Investigating the influence of cosmic ray and solar activities on atmospheric weather dynamics within the equatorial electrojet region (Nigeria)

Oloketuyi,

Omole

2024

Discov Atmos

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The association between atmospheric weather conditions along the equatorial electrojets and complexity in emergence flux in solar magnetic activity involved in the weather fluctuation processes may be substantial such that it affect the weather conditions particularly in the earth’s equatorial regions. In this study, we have analysed relevant parameters influencing the atmospheric weather conditions across the major cities and zones in Nigeria with solar magnetic activity and cosmic ray intensity covering five solar cycles from 19 to 24. Our investigation was principally based on solar magnetic activity which include solar parameters; flare index, cosmic ray, and atmospheric weather parameters including temperature, relative humidity, and precipitation. We utilized the cross-correlation and wavelet coherence techniques. The study found that the Northern region (Guinea and Sahel Savannah) located along 8.92 to 13.70 degrees latitudes and the Southern regions (Coastal and Derived) located within latitudes 4.5 and 8.9 degree latitudes responded differently to various atmospheric and solar parameters. The temperature and relative humidity in the northern parts is comparatively higher than in the southern region, while the southern region experienced higher precipitation. The flare index and cosmic ray exhibit different patterns as well negatively correlated. The relationships between the precipitations and relative humidity across Nigeria show a distinct behaviour which could be attributed to concentrations of ions influencing cloud properties across the country. There are strong and positive correlations between the two indices, with high coefficients specifically during the examined solar cycles. The difference in responses between Southern and Northern Nigeria could be attributed to mechanism driving the atmospheric weather through the Earth latitudinal couplings.

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Seasonal Variability of Rainfall and its Decadal Anomaly over Nigeria: Possible Role of Solar and Geomagnetic Activities

Cited by 6 publications

References 7 publications

Preliminary Investigation of Total Ozone Column and Its Relationship with Atmospheric Variables

Preliminary Investigation of Total Ozone Column and Its Relationship with Atmospheric Variables

Investigation of possible connections between solar activity and climate change in Nigeria

Investigating the influence of cosmic ray and solar activities on atmospheric weather dynamics within the equatorial electrojet region (Nigeria)

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