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

Abstract 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...

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Autores principales:	Olga V. Churakova Sidorova, Rolf T. W. Siegwolf, Marina V. Fonti, Eugene A. Vaganov, Matthias Saurer
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/8a3d36c1c6974f9089d71ae54d1f7d66
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spelling	oai:doaj.org-article:8a3d36c1c6974f9089d71ae54d1f7d662021-12-02T18:48:09ZSpring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years10.1038/s41598-021-97911-22045-2322https://doaj.org/article/8a3d36c1c6974f9089d71ae54d1f7d662021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97911-2https://doaj.org/toc/2045-2322Abstract 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 (δ13Ccell and δ18Ocell) 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.Olga V. Churakova SidorovaRolf T. W. SiegwolfMarina V. FontiEugene A. VaganovMatthias SaurerNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Olga V. Churakova Sidorova Rolf T. W. Siegwolf Marina V. Fonti Eugene A. Vaganov Matthias Saurer Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years
description	Abstract 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 (δ13Ccell and δ18Ocell) 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.
format	article
author	Olga V. Churakova Sidorova Rolf T. W. Siegwolf Marina V. Fonti Eugene A. Vaganov Matthias Saurer
author_facet	Olga V. Churakova Sidorova Rolf T. W. Siegwolf Marina V. Fonti Eugene A. Vaganov Matthias Saurer
author_sort	Olga V. Churakova Sidorova
title	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_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_sort	spring arctic oscillation as a trigger of summer drought in siberian subarctic over the past 1494 years
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/8a3d36c1c6974f9089d71ae54d1f7d66
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Spring arctic oscillation as a trigger of summer drought in Siberian subarctic over the past 1494 years

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