Dendro-provenancing of Arctic driftwood

0474821 - BÚ 2018 RIV GB eng J - Journal Article
Hellmann, L. - Tegel, W. - Geyer, J. - Kirdyanov, A. V. - Nikolaev, A. N. - Eggertsson, O. - Altman, Jan - Reinig, F. - Morganti, S. - Wacker, L. - Büntgen, Ulf
Dendro-provenancing of Arctic driftwood.
Quaternary Science Reviews. Roč. 162, 15 April 2017 (2017), s. 1-11. ISSN 0277-3791. E-ISSN 1873-457X
R&D Projects: GA ČR(CZ) GA17-07378S
Institutional support: RVO:67985939 ; RVO:67179843
Keywords : Driftwood * Arctic ocean * Boreal forest
OECD category: Climatic research; Climatic research (UEK-B)
Impact factor: 4.334, year: 2017

Arctic driftwood may represent a cross-disciplinary proxy archive at the interface of marine and terrestrial environments, which will likely gain in importance under future global climate change. Circumpolar network analyses that systematically consider species-specific boreal origin areas, transport routes and deposition characteristics of Arctic driftwood, are, however, missing. Here, we present treering width (TRW) measurements of 2412 pine, larch and spruce driftwood samples from Greenland, Iceland, Svalbard, the Faroe Islands, and the Lena Delta in northeastern Siberia. Representing the largest Arctic driftwood TRW compilation, these data are compared against 495 TRW reference chronologies from the boreal forests of Eurasia and North America. The southern Yenisei region is the main source for recent pine driftwood at all Arctic sampling sites, whereas spruce mainly originates in western Russia and central Siberia, as well as in northern North America. Larch driftwood is, for the first time, dendroprovenanced to central and eastern Siberia. A new larch driftwood chronology extends the middle Lena River reference chronology back to 1203 CE. Annually resolved radiocarbon measurements further date six larch driftwood chronologies between 1294 and 2013 CE. Although being highly replicated, our study emphasizes the importance of interdisciplinary research efforts including radiocarbon dating, isotopic tracing and aDNA processing for improving Arctic driftwood provenancing in space and time. If successful, Arctic driftwood studies will contribute to the reconstruction of past boreal summer temperature variations and ocean current dynamics, as well as changes in sea ice extent and relative sea level over the
last centuries to millennia.
Permanent Link: http://hdl.handle.net/11104/0273497