Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record

Abstract Currently there is a scarcity of paleo-records related to the North Atlantic Oscillation (NAO), particularly in East-Central Europe (ECE). Here we report δ15N analysis of guano from a cave in NW Romania with the intent of reconstructing past variation in ECE hydroclimate and examine NAO imp...

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Autores principales:	Daniel M. Cleary, Jonathan G. Wynn, Monica Ionita, Ferenc L. Forray, Bogdan P. Onac
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/5e68a35ccde34423b482e340426dd9d6
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spelling	oai:doaj.org-article:5e68a35ccde34423b482e340426dd9d62021-12-02T15:05:16ZEvidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record10.1038/s41598-017-14488-52045-2322https://doaj.org/article/5e68a35ccde34423b482e340426dd9d62017-10-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-14488-5https://doaj.org/toc/2045-2322Abstract Currently there is a scarcity of paleo-records related to the North Atlantic Oscillation (NAO), particularly in East-Central Europe (ECE). Here we report δ15N analysis of guano from a cave in NW Romania with the intent of reconstructing past variation in ECE hydroclimate and examine NAO impacts on winter precipitation. We argue that the δ15N values of guano indicate that the nitrogen cycle is hydrologically controlled and the δ15N values likely reflect winter precipitation related to nitrogen mineralization prior to the growing season. Drier conditions indicated by δ15N values at AD 1848–1852 and AD 1880–1930 correspond to the positive phase of the NAO. The increased frequency of negative phases of the NAO between AD 1940–1975 is contemporaneous with higher δ15N values (wetter conditions). A 4‰ decrease in δ15N values at the end of the 1970’s corresponds to a strong reduction in precipitation associated with a shift from negative to positive phase of the NAO. Using the relationship between NAO index and δ15N values in guano for the instrumental period, we reconstructed NAO-like phases back to AD 1650. Our results advocate that δ15N values of guano offer a proxy of the NAO conditions in the more distant past, helping assess its predictability.Daniel M. ClearyJonathan G. WynnMonica IonitaFerenc L. ForrayBogdan P. OnacNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Daniel M. Cleary Jonathan G. Wynn Monica Ionita Ferenc L. Forray Bogdan P. Onac Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
description	Abstract Currently there is a scarcity of paleo-records related to the North Atlantic Oscillation (NAO), particularly in East-Central Europe (ECE). Here we report δ15N analysis of guano from a cave in NW Romania with the intent of reconstructing past variation in ECE hydroclimate and examine NAO impacts on winter precipitation. We argue that the δ15N values of guano indicate that the nitrogen cycle is hydrologically controlled and the δ15N values likely reflect winter precipitation related to nitrogen mineralization prior to the growing season. Drier conditions indicated by δ15N values at AD 1848–1852 and AD 1880–1930 correspond to the positive phase of the NAO. The increased frequency of negative phases of the NAO between AD 1940–1975 is contemporaneous with higher δ15N values (wetter conditions). A 4‰ decrease in δ15N values at the end of the 1970’s corresponds to a strong reduction in precipitation associated with a shift from negative to positive phase of the NAO. Using the relationship between NAO index and δ15N values in guano for the instrumental period, we reconstructed NAO-like phases back to AD 1650. Our results advocate that δ15N values of guano offer a proxy of the NAO conditions in the more distant past, helping assess its predictability.
format	article
author	Daniel M. Cleary Jonathan G. Wynn Monica Ionita Ferenc L. Forray Bogdan P. Onac
author_facet	Daniel M. Cleary Jonathan G. Wynn Monica Ionita Ferenc L. Forray Bogdan P. Onac
author_sort	Daniel M. Cleary
title	Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
title_short	Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
title_full	Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
title_fullStr	Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
title_full_unstemmed	Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
title_sort	evidence of long-term nao influence on east-central europe winter precipitation from a guano-derived δ15n record
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/5e68a35ccde34423b482e340426dd9d6
work_keys_str_mv	AT danielmcleary evidenceoflongtermnaoinfluenceoneastcentraleuropewinterprecipitationfromaguanoderivedd15nrecord AT jonathangwynn evidenceoflongtermnaoinfluenceoneastcentraleuropewinterprecipitationfromaguanoderivedd15nrecord AT monicaionita evidenceoflongtermnaoinfluenceoneastcentraleuropewinterprecipitationfromaguanoderivedd15nrecord AT ferenclforray evidenceoflongtermnaoinfluenceoneastcentraleuropewinterprecipitationfromaguanoderivedd15nrecord AT bogdanponac evidenceoflongtermnaoinfluenceoneastcentraleuropewinterprecipitationfromaguanoderivedd15nrecord
_version_	1718388891784839168

Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record

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