North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period
This study analyzed rainfall variability in Southeast region of Nigeria using graphical models, as well as using statistical approach to investigate any significant relationship between the global North Atlantic Oscillation (NAO) Index and the regional rainfall variability in region. The study was c...
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ftbilinugalpubl:oai:ojs.bbwpublisher.com:article/3843 2023-05-15T17:29:44+02:00 North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period Fidelis Chinazor, Okorie 2021-10-29 application/pdf https://ojs.bilpublishing.com/index.php/jasr/article/view/3843 https://doi.org/10.30564/jasr.v4i4.3843 eng eng BILINGUAL PUBLISHING CO. https://ojs.bilpublishing.com/index.php/jasr/article/view/3843/3236 https://ojs.bilpublishing.com/index.php/jasr/article/view/3843 doi:10.30564/jasr.v4i4.3843 Copyright © 2021 Author(s) https://creativecommons.org/licenses/by-nc/4.0 CC-BY-NC Journal of Atmospheric Science Research; Vol 4, No 4 (2021); 42-49 2630-5119 NAO Rainfall variability Relationship Statistical analysis Southeastern Nigeria info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2021 ftbilinugalpubl https://doi.org/10.30564/jasr.v4i4.3843 2022-02-15T18:28:36Z This study analyzed rainfall variability in Southeast region of Nigeria using graphical models, as well as using statistical approach to investigate any significant relationship between the global North Atlantic Oscillation (NAO) Index and the regional rainfall variability in region. The study was conducted in three States of Southeastern Nigeria namely, Abia, Ebonyi and Imo States that lie between Latitudes 40 40’ and 80 50’N and Longitudes 60 20’ and 80 50’E. Data for the study included 30 years (1988 - 2017) archival time-series monthly rainfall values for the three study States, acquired from Nigerian Meteorological Agency (NIMET), offices in the states, and Standardized values of NAOI (North Atlantic Oscillation Index) for the same period, which were collected from a website, on the NOAA Data Center, USA. In the data analyses, the first method was adopted by using graphs to illustrate mean annual rainfall values for thirty years. Coefficient of variability was employed in evaluating the degree of variability of values from the mean rate. The second analysis was accomplished using correlation models to ascertain any relationship between NAOI and rainfall in Southeast Nigeria. The results showed a significant variability of rainfall in the region from January to December (mean monthly) within the study period. A negative correlation value of 0.7525 was obtained from the correlation analysis, showing that the global NAO index and rainfall variability deviate in the opposite direction. Coefficient of multiple determinations (CMD) subsequently showed value of 0.031%, being the variation in rainfall as influenced by the global teleconnectivity, and this means that the NAO index has zero or no influence on rainfall variability in Southeast region of Nigeria. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Bilingual Publishing Co. (BPC): E-Journals Journal of Atmospheric Science Research 4 4 |
institution |
Open Polar |
collection |
Bilingual Publishing Co. (BPC): E-Journals |
op_collection_id |
ftbilinugalpubl |
language |
English |
topic |
NAO Rainfall variability Relationship Statistical analysis Southeastern Nigeria |
spellingShingle |
NAO Rainfall variability Relationship Statistical analysis Southeastern Nigeria Fidelis Chinazor, Okorie North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
topic_facet |
NAO Rainfall variability Relationship Statistical analysis Southeastern Nigeria |
description |
This study analyzed rainfall variability in Southeast region of Nigeria using graphical models, as well as using statistical approach to investigate any significant relationship between the global North Atlantic Oscillation (NAO) Index and the regional rainfall variability in region. The study was conducted in three States of Southeastern Nigeria namely, Abia, Ebonyi and Imo States that lie between Latitudes 40 40’ and 80 50’N and Longitudes 60 20’ and 80 50’E. Data for the study included 30 years (1988 - 2017) archival time-series monthly rainfall values for the three study States, acquired from Nigerian Meteorological Agency (NIMET), offices in the states, and Standardized values of NAOI (North Atlantic Oscillation Index) for the same period, which were collected from a website, on the NOAA Data Center, USA. In the data analyses, the first method was adopted by using graphs to illustrate mean annual rainfall values for thirty years. Coefficient of variability was employed in evaluating the degree of variability of values from the mean rate. The second analysis was accomplished using correlation models to ascertain any relationship between NAOI and rainfall in Southeast Nigeria. The results showed a significant variability of rainfall in the region from January to December (mean monthly) within the study period. A negative correlation value of 0.7525 was obtained from the correlation analysis, showing that the global NAO index and rainfall variability deviate in the opposite direction. Coefficient of multiple determinations (CMD) subsequently showed value of 0.031%, being the variation in rainfall as influenced by the global teleconnectivity, and this means that the NAO index has zero or no influence on rainfall variability in Southeast region of Nigeria. |
format |
Article in Journal/Newspaper |
author |
Fidelis Chinazor, Okorie |
author_facet |
Fidelis Chinazor, Okorie |
author_sort |
Fidelis Chinazor, Okorie |
title |
North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
title_short |
North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
title_full |
North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
title_fullStr |
North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
title_full_unstemmed |
North Atlantic Oscillation and Rainfall Variability in Southeastern Nigeria: A Statistical Analysis of 30 Year Period |
title_sort |
north atlantic oscillation and rainfall variability in southeastern nigeria: a statistical analysis of 30 year period |
publisher |
BILINGUAL PUBLISHING CO. |
publishDate |
2021 |
url |
https://ojs.bilpublishing.com/index.php/jasr/article/view/3843 https://doi.org/10.30564/jasr.v4i4.3843 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Journal of Atmospheric Science Research; Vol 4, No 4 (2021); 42-49 2630-5119 |
op_relation |
https://ojs.bilpublishing.com/index.php/jasr/article/view/3843/3236 https://ojs.bilpublishing.com/index.php/jasr/article/view/3843 doi:10.30564/jasr.v4i4.3843 |
op_rights |
Copyright © 2021 Author(s) https://creativecommons.org/licenses/by-nc/4.0 |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.30564/jasr.v4i4.3843 |
container_title |
Journal of Atmospheric Science Research |
container_volume |
4 |
container_issue |
4 |
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1766124516397809664 |