Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island
This paper explores practical applications of bivariate modelling via copulas of two likely dependent random variables, i.e., of the North Atlantic Oscillation (NAO) coupled with extreme rainfall on the small island of Madeira, Portugal. Madeira, due to its small size (∼740 km <math xmlns="h...
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ftdoajarticles:oai:doaj.org/article:eec1cf3ac1a04b7da0e98100c320e303 2023-05-15T17:26:12+02:00 Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island Luis Angel Espinosa Maria Manuela Portela João Dehon Pontes Filho Martina Zelenakova 2021-05-01T00:00:00Z https://doi.org/10.3390/cli9050086 https://doaj.org/article/eec1cf3ac1a04b7da0e98100c320e303 EN eng MDPI AG https://www.mdpi.com/2225-1154/9/5/86 https://doaj.org/toc/2225-1154 doi:10.3390/cli9050086 2225-1154 https://doaj.org/article/eec1cf3ac1a04b7da0e98100c320e303 Climate, Vol 9, Iss 86, p 86 (2021) North Atlantic Oscillation winter extreme rainfall Madeira Island copulas teleconnection climate variability Science Q article 2021 ftdoajarticles https://doi.org/10.3390/cli9050086 2022-12-31T06:57:46Z This paper explores practical applications of bivariate modelling via copulas of two likely dependent random variables, i.e., of the North Atlantic Oscillation (NAO) coupled with extreme rainfall on the small island of Madeira, Portugal. Madeira, due to its small size (∼740 km <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>2</mn></msup></semantics></math> ), very pronounced mountain landscape, and location in the North Atlantic, experiences a wide range of rainfall regimes, or microclimates, which hamper the analyses of extreme rainfall. Previous studies showed that the influence of the North Atlantic Oscillation (NAO) on extreme rainfall is at its largest in the North Atlantic sector, with the likelihood of increased rainfall events from December through February, particularly during negative NAO phases. Thus, a copula-based approach was adopted for teleconnection, aiming at assigning return periods of daily values of an NAO index (NAOI) coupled with extreme daily rainfalls—for the period from December 1967 to February 2017—at six representative rain gauges of the island. The results show that (i) bivariate copulas describing the dependence characteristics of the underlying joint distributions may provide useful analytical expressions of the return periods of the coupled previous NAOI and extreme rainfall and (ii) that recent years show signs of increasing climate variability with more anomalous daily negative NAOI along with higher extreme rainfall events. These findings highlight the importance of multivariate modelling for teleconnections of prominent patterns of climate variability, such as the NAO, to extreme rainfall in North Atlantic regions, especially in small islands that are highly vulnerable to the effects of abrupt climate variability. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Directory of Open Access Journals: DOAJ Articles Climate 9 5 86 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
North Atlantic Oscillation winter extreme rainfall Madeira Island copulas teleconnection climate variability Science Q |
spellingShingle |
North Atlantic Oscillation winter extreme rainfall Madeira Island copulas teleconnection climate variability Science Q Luis Angel Espinosa Maria Manuela Portela João Dehon Pontes Filho Martina Zelenakova Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
topic_facet |
North Atlantic Oscillation winter extreme rainfall Madeira Island copulas teleconnection climate variability Science Q |
description |
This paper explores practical applications of bivariate modelling via copulas of two likely dependent random variables, i.e., of the North Atlantic Oscillation (NAO) coupled with extreme rainfall on the small island of Madeira, Portugal. Madeira, due to its small size (∼740 km <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mrow></mrow><mn>2</mn></msup></semantics></math> ), very pronounced mountain landscape, and location in the North Atlantic, experiences a wide range of rainfall regimes, or microclimates, which hamper the analyses of extreme rainfall. Previous studies showed that the influence of the North Atlantic Oscillation (NAO) on extreme rainfall is at its largest in the North Atlantic sector, with the likelihood of increased rainfall events from December through February, particularly during negative NAO phases. Thus, a copula-based approach was adopted for teleconnection, aiming at assigning return periods of daily values of an NAO index (NAOI) coupled with extreme daily rainfalls—for the period from December 1967 to February 2017—at six representative rain gauges of the island. The results show that (i) bivariate copulas describing the dependence characteristics of the underlying joint distributions may provide useful analytical expressions of the return periods of the coupled previous NAOI and extreme rainfall and (ii) that recent years show signs of increasing climate variability with more anomalous daily negative NAOI along with higher extreme rainfall events. These findings highlight the importance of multivariate modelling for teleconnections of prominent patterns of climate variability, such as the NAO, to extreme rainfall in North Atlantic regions, especially in small islands that are highly vulnerable to the effects of abrupt climate variability. |
format |
Article in Journal/Newspaper |
author |
Luis Angel Espinosa Maria Manuela Portela João Dehon Pontes Filho Martina Zelenakova |
author_facet |
Luis Angel Espinosa Maria Manuela Portela João Dehon Pontes Filho Martina Zelenakova |
author_sort |
Luis Angel Espinosa |
title |
Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
title_short |
Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
title_full |
Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
title_fullStr |
Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
title_full_unstemmed |
Bivariate Modelling of a Teleconnection Index and Extreme Rainfall in a Small North Atlantic Island |
title_sort |
bivariate modelling of a teleconnection index and extreme rainfall in a small north atlantic island |
publisher |
MDPI AG |
publishDate |
2021 |
url |
https://doi.org/10.3390/cli9050086 https://doaj.org/article/eec1cf3ac1a04b7da0e98100c320e303 |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_source |
Climate, Vol 9, Iss 86, p 86 (2021) |
op_relation |
https://www.mdpi.com/2225-1154/9/5/86 https://doaj.org/toc/2225-1154 doi:10.3390/cli9050086 2225-1154 https://doaj.org/article/eec1cf3ac1a04b7da0e98100c320e303 |
op_doi |
https://doi.org/10.3390/cli9050086 |
container_title |
Climate |
container_volume |
9 |
container_issue |
5 |
container_start_page |
86 |
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1766117788623044608 |