Výsledky vyhledávání - "Á. Geirsdóttir"

Akademický článek

Spatiotemporal variation of modern lake, stream, and soil water isotopes in Iceland

Autor: D. J. Harning, J. H. Raberg, J. M. McFarlin, Y. Axford, C. R. Florian, K. B. Ólafsdóttir, S. Kopf, J. Sepúlveda, G. H. Miller, Á. Geirsdóttir

Publikováno v: Hydrology and Earth System Sciences, Vol 28, Pp 4275-4293 (2024)

As global warming progresses, changes in high-latitude precipitation are expected to impart long-lasting impacts on Earth systems, including glacier mass balance and ecosystem structures. Reconstructing past changes in high-latitude precipitation and

Externí odkaz: https://doaj.org/article/80f3e5c5ccf5474aad06570fa57399fe

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Akademický článek

A Holocene history of climate, fire, landscape evolution, and human activity in northeastern Iceland

Autor: N. Ardenghi, D. J. Harning, J. H. Raberg, B. R. Holman, T. Thordarson, Á. Geirsdóttir, G. H. Miller, J. Sepúlveda

Publikováno v: Climate of the Past, Vol 20, Pp 1087-1123 (2024)

Paleoclimate reconstructions across Iceland provide a template for past changes in climate across the northern North Atlantic, a crucial region due to its position relative to the global northward heat transport system and its vulnerability to climat

Externí odkaz: https://doaj.org/article/309576e025b6402b84729cf2cf2df50a

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Akademický článek

Moss kill dates and modeled summer temperature track episodic snowline lowering and ice cap expansion in Arctic Canada through the Common Era

Autor: G. H. Miller, S. L. Pendleton, A. Jahn, Y. Zhong, J. T. Andrews, S. J. Lehman, J. P. Briner, J. H. Raberg, H. Bueltmann, M. Raynolds, Á. Geirsdóttir, J. R. Southon

Publikováno v: Climate of the Past, Vol 19, Pp 2341-2360 (2023)

Most extant ice caps mantling low-relief Arctic Canada landscapes remained cold based throughout the late Holocene, preserving in situ bryophytes killed as ice expanded across vegetated landscapes. After reaching peak late Holocene dimensions ∼1900

Externí odkaz: https://doaj.org/article/2bddb4b9f9264238939ca132d243cdbd

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Akademický článek

Revised fractional abundances and warm-season temperatures substantially improve brGDGT calibrations in lake sediments

Autor: J. H. Raberg, D. J. Harning, S. E. Crump, G. de Wet, A. Blumm, S. Kopf, Á. Geirsdóttir, G. H. Miller, J. Sepúlveda

Publikováno v: Biogeosciences, Vol 18, Pp 3579-3603 (2021)

Distributions of branched glycerol dialkyl glycerol tetraethers (brGDGTs) are frequently employed for reconstructing terrestrial paleotemperatures from lake sediment archives. Although brGDGTs are globally ubiquitous, the microbial producers of these

Externí odkaz: https://doaj.org/article/77604c7125e44c8d96b1f2867e415a8a

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Akademický článek

Response of biological productivity to North Atlantic marine front migration during the Holocene

Autor: D. J. Harning, A. E. Jennings, D. Köseoğlu, S. T. Belt, Á. Geirsdóttir, J. Sepúlveda

Publikováno v: Climate of the Past, Vol 17, Pp 379-396 (2021)

Marine fronts delineate the boundary between distinct water masses and, through the advection of nutrients, are important facilitators of regional productivity and biodiversity. As the modern climate continues to change, the migration of frontal zone

Externí odkaz: https://doaj.org/article/da77deeb2210472c91c3f8abcdebaffa

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Akademický článek

The onset of neoglaciation in Iceland and the 4.2 ka event

Autor: Á. Geirsdóttir, G. H. Miller, J. T. Andrews, D. J. Harning, L. S. Anderson, C. Florian, D. J. Larsen, T. Thordarson

Publikováno v: Climate of the Past, Vol 15, Pp 25-40 (2019)

Strong similarities in Holocene climate reconstructions derived from multiple proxies (BSi, TOC – total organic carbon, δ13C, C∕N, MS – magnetic susceptibility, δ15N) preserved in sediments from both glacial and non-glacial lakes across Icela

Externí odkaz: https://doaj.org/article/d886e45c28084784aa534d1a06c5224e

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