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Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years

Rapid changes in the hydrological and temperature regimes over the past decades at the northern latitudes enhance significantly permafrost degradation accelerating carbon release, increase the frequency of drought events and extensive wildfires. However, the mechanisms and dynamics driving drought e...

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Autores principales: Churakova Sidorova, Olga V., Siegwolf, Rolf T. W., Fonti, Marina V., Vaganov, Eugene A., Saurer, Matthias
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8463678/
https://www.ncbi.nlm.nih.gov/pubmed/34561482
http://dx.doi.org/10.1038/s41598-021-97911-2
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author Churakova Sidorova, Olga V.
Siegwolf, Rolf T. W.
Fonti, Marina V.
Vaganov, Eugene A.
Saurer, Matthias
author_facet Churakova Sidorova, Olga V.
Siegwolf, Rolf T. W.
Fonti, Marina V.
Vaganov, Eugene A.
Saurer, Matthias
author_sort Churakova Sidorova, Olga V.
collection PubMed
description Rapid changes in the hydrological and temperature regimes over the past decades at the northern latitudes enhance significantly permafrost degradation accelerating carbon release, increase the frequency of drought events and extensive wildfires. However, the mechanisms and dynamics driving drought events and their influence on Siberian forests are currently the subject of numerous research activities. Newly developed and annually resolved stable carbon and oxygen isotope chronologies of larch tree-ring cellulose (δ(13)C(cell) and δ(18)O(cell)) for the period 516–2009 CE allowed the reconstruction of July precipitation and Arctic Oscillation (AO) in May, respectively. Unprecedented drought events occurred towards twentieth–twenty-first centuries as indicated by the July precipitation reconstruction. Positive AO phases in May were most pronounced during the second part of the first millennium, but also increased in frequency in the modern period of the twentieth–twenty-first centuries. Negative AO phases are associated with cold anomalies and show a remarkable decrease in the nineteenth century caused by a series of major volcanic eruptions. Our findings help explaining the increased frequency of Siberian forest fires over the past decades in Central Siberia consistent with a reduction of summer precipitation, triggered by a positive phase of the Arctic Oscillation in May.
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spelling pubmed-84636782021-09-29 Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years Churakova Sidorova, Olga V. Siegwolf, Rolf T. W. Fonti, Marina V. Vaganov, Eugene A. Saurer, Matthias Sci Rep Article Rapid changes in the hydrological and temperature regimes over the past decades at the northern latitudes enhance significantly permafrost degradation accelerating carbon release, increase the frequency of drought events and extensive wildfires. However, the mechanisms and dynamics driving drought events and their influence on Siberian forests are currently the subject of numerous research activities. Newly developed and annually resolved stable carbon and oxygen isotope chronologies of larch tree-ring cellulose (δ(13)C(cell) and δ(18)O(cell)) for the period 516–2009 CE allowed the reconstruction of July precipitation and Arctic Oscillation (AO) in May, respectively. Unprecedented drought events occurred towards twentieth–twenty-first centuries as indicated by the July precipitation reconstruction. Positive AO phases in May were most pronounced during the second part of the first millennium, but also increased in frequency in the modern period of the twentieth–twenty-first centuries. Negative AO phases are associated with cold anomalies and show a remarkable decrease in the nineteenth century caused by a series of major volcanic eruptions. Our findings help explaining the increased frequency of Siberian forest fires over the past decades in Central Siberia consistent with a reduction of summer precipitation, triggered by a positive phase of the Arctic Oscillation in May. Nature Publishing Group UK 2021-09-24 /pmc/articles/PMC8463678/ /pubmed/34561482 http://dx.doi.org/10.1038/s41598-021-97911-2 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Churakova Sidorova, Olga V.
Siegwolf, Rolf T. W.
Fonti, Marina V.
Vaganov, Eugene A.
Saurer, Matthias
Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title_full Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title_fullStr Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title_full_unstemmed Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title_short Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
title_sort spring arctic oscillation as a trigger of summer drought in siberian subarctic over the past 1494 years
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8463678/
https://www.ncbi.nlm.nih.gov/pubmed/34561482
http://dx.doi.org/10.1038/s41598-021-97911-2
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