Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain

Atmospheric-oceanic circulations (teleconnections) have an important influence on regional climate. In Great Britain, the North Atlantic Oscillation (NAO) has long been understood as the leading mode of climate variability, and its phase and magnitude have been found to influence regional rainfall i...

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Autores principales:	Harry West, Nevil Quinn, Michael Horswell
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	North Atlantic Oscillation (NAO) East Atlantic Pattern (EA) rainfall signatures spatio-temporal analysis Great Britain Meteorology. Climatology QC851-999
Acceso en línea:	https://doaj.org/article/d1a0ba6daa114a4f8ddf5173bdfb3c0d
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spelling	oai:doaj.org-article:d1a0ba6daa114a4f8ddf5173bdfb3c0d2021-11-25T16:45:57ZMonthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain10.3390/atmos121115332073-4433https://doaj.org/article/d1a0ba6daa114a4f8ddf5173bdfb3c0d2021-11-01T00:00:00Zhttps://www.mdpi.com/2073-4433/12/11/1533https://doaj.org/toc/2073-4433Atmospheric-oceanic circulations (teleconnections) have an important influence on regional climate. In Great Britain, the North Atlantic Oscillation (NAO) has long been understood as the leading mode of climate variability, and its phase and magnitude have been found to influence regional rainfall in previous research. The East Atlantic Pattern (EA) is also increasingly recognised as being a secondary influence on European climate. In this study we use high resolution gridded rainfall and Standardised Precipitation Index (SPI) time series data for Great Britain to map the monthly rainfall signatures of the NAO and EA over the period January 1950–December 2015. Our analyses show that the influence of the two teleconnections varies in space and time with distinctive monthly signatures observed in both average rainfall/SPI-1 values and incidences of wet/dry extremes. In the winter months the NAO has a strong influence on rainfall and extremes in the north-western regions. Meanwhile, in the southern and central regions stronger EA-rainfall relationships are present. In the summer months opposing positive/negative phases of the NAO and EA result in stronger wet/dry signatures which are more spatially consistent. Our findings suggest that both the NAO and EA have a prominent influence on regional rainfall distribution and volume in Great Britain, which in turn has implications for the use of teleconnection forecasts in water management decision making. We conclude that accounting for both NAO and EA influences will lead to an enhanced understanding of both historic and future spatial distribution of monthly precipitation.Harry WestNevil QuinnMichael HorswellMDPI AGarticleNorth Atlantic Oscillation (NAO)East Atlantic Pattern (EA)rainfall signaturesspatio-temporal analysisGreat BritainMeteorology. ClimatologyQC851-999ENAtmosphere, Vol 12, Iss 1533, p 1533 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	North Atlantic Oscillation (NAO) East Atlantic Pattern (EA) rainfall signatures spatio-temporal analysis Great Britain Meteorology. Climatology QC851-999
spellingShingle	North Atlantic Oscillation (NAO) East Atlantic Pattern (EA) rainfall signatures spatio-temporal analysis Great Britain Meteorology. Climatology QC851-999 Harry West Nevil Quinn Michael Horswell Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
description	Atmospheric-oceanic circulations (teleconnections) have an important influence on regional climate. In Great Britain, the North Atlantic Oscillation (NAO) has long been understood as the leading mode of climate variability, and its phase and magnitude have been found to influence regional rainfall in previous research. The East Atlantic Pattern (EA) is also increasingly recognised as being a secondary influence on European climate. In this study we use high resolution gridded rainfall and Standardised Precipitation Index (SPI) time series data for Great Britain to map the monthly rainfall signatures of the NAO and EA over the period January 1950–December 2015. Our analyses show that the influence of the two teleconnections varies in space and time with distinctive monthly signatures observed in both average rainfall/SPI-1 values and incidences of wet/dry extremes. In the winter months the NAO has a strong influence on rainfall and extremes in the north-western regions. Meanwhile, in the southern and central regions stronger EA-rainfall relationships are present. In the summer months opposing positive/negative phases of the NAO and EA result in stronger wet/dry signatures which are more spatially consistent. Our findings suggest that both the NAO and EA have a prominent influence on regional rainfall distribution and volume in Great Britain, which in turn has implications for the use of teleconnection forecasts in water management decision making. We conclude that accounting for both NAO and EA influences will lead to an enhanced understanding of both historic and future spatial distribution of monthly precipitation.
format	article
author	Harry West Nevil Quinn Michael Horswell
author_facet	Harry West Nevil Quinn Michael Horswell
author_sort	Harry West
title	Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
title_short	Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
title_full	Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
title_fullStr	Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
title_full_unstemmed	Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain
title_sort	monthly rainfall signatures of the north atlantic oscillation and east atlantic pattern in great britain
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/d1a0ba6daa114a4f8ddf5173bdfb3c0d
work_keys_str_mv	AT harrywest monthlyrainfallsignaturesofthenorthatlanticoscillationandeastatlanticpatterningreatbritain AT nevilquinn monthlyrainfallsignaturesofthenorthatlanticoscillationandeastatlanticpatterningreatbritain AT michaelhorswell monthlyrainfallsignaturesofthenorthatlanticoscillationandeastatlanticpatterningreatbritain
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Monthly Rainfall Signatures of the North Atlantic Oscillation and East Atlantic Pattern in Great Britain

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