Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO
ABSTRACT The present study examines trends in extreme temperature absolute indices [warmest day ( TXx ), coldest day ( TXn ), warmest night ( TNx ) and coldest night ( TNn )] using the newly homogenized daily minimum and maximum temperature series from 21 stations in Nigeria for the period 1971–2012...
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crwiley:10.1002/joc.5196 2024-09-15T18:23:57+00:00 Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO Abatan, Abayomi A. Abiodun, Babatunde J. Gutowski, William J. Rasaq‐Balogun, Saidat O. U.S. National Science Foundation Earth System Modeling (EaSM) Federal University of Technology 2017 http://dx.doi.org/10.1002/joc.5196 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.5196 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.5196 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor International Journal of Climatology volume 38, issue 2, page 593-612 ISSN 0899-8418 1097-0088 journal-article 2017 crwiley https://doi.org/10.1002/joc.5196 2024-07-09T04:11:42Z ABSTRACT The present study examines trends in extreme temperature absolute indices [warmest day ( TXx ), coldest day ( TXn ), warmest night ( TNx ) and coldest night ( TNn )] using the newly homogenized daily minimum and maximum temperature series from 21 stations in Nigeria for the period 1971–2012. The indices provide an understanding of the characteristics of changing temperature, in light of the present anthropogenic global warming. Trends in the indices and the statistical significance are obtained using the modified Mann–Kendall test in the R‐package. The results show that many of the stations have significant increasing trends in the absolute indices, with the warming most pronounced in Southern Nigeria. Averaged over the country, the TXx , TXn , TNx and TNn have absolute warming trends of 0.59, 0.17, 0.67and 0.97 °C, respectively, for the 42 years since 1971. The warming rate is highest during the winter ( DJF ) season for TNn . The present study also examines the possible influence of large‐scale teleconnection patterns on extreme temperature variations by determining the correlation between the absolute indices and the North Atlantic Oscillation ( NAO ) index on monthly, seasonal and annual timescales. Our results show that warming over Nigeria during the dry season months from November to February is significantly correlated with NAO . The NAO has significant correlation with TXx and TXn in the north, and with TNx and TNn in the south. The analysis is repeated with ERA ‐20C‐gridded data set, and similar correlations are found. The warming nights, in particular, in Nigeria can lead to sleeplessness and widespread mosquito‐related diseases as the mosquito population and its parasites thrive in warmer conditions. The results of the analyses are relevant for decision‐making process, especially for the development of early warning systems for extreme heat events. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Wiley Online Library International Journal of Climatology 38 2 593 612 |
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Open Polar |
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Wiley Online Library |
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English |
description |
ABSTRACT The present study examines trends in extreme temperature absolute indices [warmest day ( TXx ), coldest day ( TXn ), warmest night ( TNx ) and coldest night ( TNn )] using the newly homogenized daily minimum and maximum temperature series from 21 stations in Nigeria for the period 1971–2012. The indices provide an understanding of the characteristics of changing temperature, in light of the present anthropogenic global warming. Trends in the indices and the statistical significance are obtained using the modified Mann–Kendall test in the R‐package. The results show that many of the stations have significant increasing trends in the absolute indices, with the warming most pronounced in Southern Nigeria. Averaged over the country, the TXx , TXn , TNx and TNn have absolute warming trends of 0.59, 0.17, 0.67and 0.97 °C, respectively, for the 42 years since 1971. The warming rate is highest during the winter ( DJF ) season for TNn . The present study also examines the possible influence of large‐scale teleconnection patterns on extreme temperature variations by determining the correlation between the absolute indices and the North Atlantic Oscillation ( NAO ) index on monthly, seasonal and annual timescales. Our results show that warming over Nigeria during the dry season months from November to February is significantly correlated with NAO . The NAO has significant correlation with TXx and TXn in the north, and with TNx and TNn in the south. The analysis is repeated with ERA ‐20C‐gridded data set, and similar correlations are found. The warming nights, in particular, in Nigeria can lead to sleeplessness and widespread mosquito‐related diseases as the mosquito population and its parasites thrive in warmer conditions. The results of the analyses are relevant for decision‐making process, especially for the development of early warning systems for extreme heat events. |
author2 |
U.S. National Science Foundation Earth System Modeling (EaSM) Federal University of Technology |
format |
Article in Journal/Newspaper |
author |
Abatan, Abayomi A. Abiodun, Babatunde J. Gutowski, William J. Rasaq‐Balogun, Saidat O. |
spellingShingle |
Abatan, Abayomi A. Abiodun, Babatunde J. Gutowski, William J. Rasaq‐Balogun, Saidat O. Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
author_facet |
Abatan, Abayomi A. Abiodun, Babatunde J. Gutowski, William J. Rasaq‐Balogun, Saidat O. |
author_sort |
Abatan, Abayomi A. |
title |
Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
title_short |
Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
title_full |
Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
title_fullStr |
Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
title_full_unstemmed |
Trends and variability in absolute indices of temperature extremes over Nigeria: linkage with NAO |
title_sort |
trends and variability in absolute indices of temperature extremes over nigeria: linkage with nao |
publisher |
Wiley |
publishDate |
2017 |
url |
http://dx.doi.org/10.1002/joc.5196 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fjoc.5196 https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/joc.5196 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
International Journal of Climatology volume 38, issue 2, page 593-612 ISSN 0899-8418 1097-0088 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/joc.5196 |
container_title |
International Journal of Climatology |
container_volume |
38 |
container_issue |
2 |
container_start_page |
593 |
op_container_end_page |
612 |
_version_ |
1810464239489384448 |