Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record
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 w...
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ftpubmed:oai:pubmedcentral.nih.gov:5658435 2023-05-15T17:33:50+02:00 Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record Cleary, Daniel M. Wynn, Jonathan G. Ionita, Monica Forray, Ferenc L. Onac, Bogdan P. 2017-10-26 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5658435/ http://www.ncbi.nlm.nih.gov/pubmed/29075012 https://doi.org/10.1038/s41598-017-14488-5 en eng Nature Publishing Group UK http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5658435/ http://www.ncbi.nlm.nih.gov/pubmed/29075012 http://dx.doi.org/10.1038/s41598-017-14488-5 © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. CC-BY Article Text 2017 ftpubmed https://doi.org/10.1038/s41598-017-14488-5 2017-11-05T01:34:20Z 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. Text North Atlantic North Atlantic oscillation PubMed Central (PMC) Guano ENVELOPE(141.604,141.604,-66.775,-66.775) Scientific Reports 7 1 |
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Article Cleary, Daniel M. Wynn, Jonathan G. Ionita, Monica Forray, Ferenc L. Onac, Bogdan P. Evidence of long-term NAO influence on East-Central Europe winter precipitation from a guano-derived δ15N record |
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description |
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 |
Text |
author |
Cleary, Daniel M. Wynn, Jonathan G. Ionita, Monica Forray, Ferenc L. Onac, Bogdan P. |
author_facet |
Cleary, Daniel M. Wynn, Jonathan G. Ionita, Monica Forray, Ferenc L. Onac, Bogdan P. |
author_sort |
Cleary, Daniel M. |
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 Publishing Group UK |
publishDate |
2017 |
url |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5658435/ http://www.ncbi.nlm.nih.gov/pubmed/29075012 https://doi.org/10.1038/s41598-017-14488-5 |
long_lat |
ENVELOPE(141.604,141.604,-66.775,-66.775) |
geographic |
Guano |
geographic_facet |
Guano |
genre |
North Atlantic North Atlantic oscillation |
genre_facet |
North Atlantic North Atlantic oscillation |
op_relation |
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5658435/ http://www.ncbi.nlm.nih.gov/pubmed/29075012 http://dx.doi.org/10.1038/s41598-017-14488-5 |
op_rights |
© The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
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CC-BY |
op_doi |
https://doi.org/10.1038/s41598-017-14488-5 |
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