Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N 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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ftunisfloridatam:oai:digitalcommons.usf.edu:geo_facpub-2890 2023-05-15T17:33:38+02:00 Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N Record Cleary, Daniel M. Wynn, Jonathan G Ionita, Monica Forray, Ferenc L Onac, Bogdan P 2017-01-01T08:00:00Z application/pdf https://digitalcommons.usf.edu/geo_facpub/1923 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2890&context=geo_facpub unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/geo_facpub/1923 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2890&context=geo_facpub http://creativecommons.org/licenses/by/4.0/ CC-BY School of Geosciences Faculty and Staff Publications Earth Sciences article 2017 ftunisfloridatam 2021-10-09T07:49:28Z 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. Article in Journal/Newspaper North Atlantic North Atlantic oscillation Digital Commons University of South Florida (USF) Guano ENVELOPE(141.604,141.604,-66.775,-66.775) |
institution |
Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Earth Sciences |
spellingShingle |
Earth Sciences 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 δ 15 N Record |
topic_facet |
Earth Sciences |
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 |
Article in Journal/Newspaper |
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 δ 15 N Record |
title_short |
Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N Record |
title_full |
Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N Record |
title_fullStr |
Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N Record |
title_full_unstemmed |
Evidence of Long-Term NAO Influence on East-Central Europe Winter Precipitation from a Guano-Derived δ 15 N Record |
title_sort |
evidence of long-term nao influence on east-central europe winter precipitation from a guano-derived δ 15 n record |
publisher |
Digital Commons @ University of South Florida |
publishDate |
2017 |
url |
https://digitalcommons.usf.edu/geo_facpub/1923 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2890&context=geo_facpub |
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_source |
School of Geosciences Faculty and Staff Publications |
op_relation |
https://digitalcommons.usf.edu/geo_facpub/1923 https://digitalcommons.usf.edu/cgi/viewcontent.cgi?article=2890&context=geo_facpub |
op_rights |
http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
_version_ |
1766132203122589696 |