A multiproxy evaluation of Holocene environmental change from Lake Igaliku, South Greenland

Massa, Charly; Perren, Bianca B.; Gauthier, Émilie; Bichet, Vincent; Petit, Christophe; Richard, Hervé

doi:10.1007/s10933-012-9594-5

Cited by 39 publications

(53 citation statements)

References 73 publications

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“…This hypothesis is supported by 1) a ~2˚C decrease in CI-MAATs and 2) the synchronous shift in chironomid and diatom assemblages, indicating a significant deepening of the water column (dominance of chironomid taxa preferring deeper, cooler waters and a higher proportion of planktonic diatoms). These results agree with comparable lake records from South and Southwest Greenland (Massa et al, 2012;Perren et al, 2012) and with measures of past temperatures from the Greenland Ice Sheet (GIS; �ummit and Dye 3 boreholes) (Dahl-Jensen et al, 1998), which show the Holocene climatic optimum from 8000 to 5000 BP, followed by the period of Neoglacial cooling from 5000 to about 2000 BP. É. SAULNIER-TALBOT et al NIER-TALBOT et al Overall, we found evidence for reliable chironomidbased inferences of temperature trends for the region, especially from the two headwater lakes.…”

Section: Discussionsupporting

confidence: 87%

Response of Lacustrine Biota to Late Holocene Climate and Environmental Conditions in Northernmost Ungava (Canada)

Saulnier‐Talbot

Larocque‐Tobler²,

Gregory‐Eaves³

et al. 2015

ARCTIC

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ABSTRACT. Sediment cores from three lakes located in the northernmost region of Ungava, Québec (Canada) were examined to define aquatic community and ecosystem variability during the Late Holocene period. A chironomid-based transfer function was used to reconstruct August air temperature trends, and lacustrine primary production was inferred from sedimentary biogenic silica content and siliceous microfossil abundances. Trends in primary production, sediment organic matter content (estimated through loss on ignition), and chironomid-inferred temperature were compared to explore potential effects of environmental change on biotic assemblage composition at centennial to millennial time scales. Although no direct correlation between chironomid-inferred August air temperature and primary production was observed, we found indications that both chironomid and diatom communities were responding to the same overarching regional climatic and environmental processes. Over the last decade, northern Québec has been undergoing notable, rapid warming that contrasts with the relative inertia of the past few millennia. This study provides a baseline against which recent and future environmental changes in this region can be compared.Key words: chironomids; diatoms; biogenic silica; climate; northern lakes; Ungava RÉSUMÉ. Les archives sédimentaires couvrant la période de l'Holocène tardif ont été examinées dans trois lacs situés dans la région du nord de l'Ungava, au Québec (Canada). Un modèle d'inférence basé sur les assemblages de chironomides a été utilisé pour reconstruire la variabilité des températures de l'air du mois d'août, et la production primaire lacustre a été inférée par le contenu sédimentaire en silice biogénique et les abondances des microfossiles siliceux. Les variations historiques de la production primaire, du contenu organique du sédiment (évalué par la perte au feu) et les températures inférées ont été comparées afin d'explorer les effets potentiels des changements environnementaux sur la composition des assemblages à différentes échelles temporelles (centenaires à millénaires). Malgré le fait qu'aucune corrélation directe n'ait été observée entre les températures inférées en août et la productivité primaire, certaines indications suggèrent que les communautés de chironomides et de diatomées répondaient aux mêmes processus climatiques et environnementaux régionaux. Au cours de la dernière décennie, le nord du Québec a connu un réchauffement rapide et marqué, contrastant avec l'inertie relative des derniers millénaires. Cette étude fournit le scénario de référence par rapport auquel les changements environnementaux actuels et futurs pourront être comparés dans cette région.

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Section: Discussionsupporting

confidence: 87%

Response of Lacustrine Biota to Late Holocene Climate and Environmental Conditions in Northernmost Ungava (Canada)

Saulnier‐Talbot

Larocque‐Tobler²,

Gregory‐Eaves³

et al. 2015

ARCTIC

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“…ported to be as late as AD 1900 (e.g., Gunnarson et al, 2011;Isaksson et al, 2005;Linge et al, 2009;Massa et al, 2012) (Fig. 7a and b).…”

Section: Secular Variabilitymentioning

confidence: 99%

Climate variability in the subarctic area for the last 2 millennia

et al. 2018

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Abstract.To put recent climate change in perspective, it is necessary to extend the instrumental climate records with proxy data from paleoclimate archives. Arctic climate variability for the last 2 millennia has been investigated using statistical and signal analyses from three regionally averaged records from the North Atlantic, Siberia and Alaska based on many types of proxy data archived in the Arctic 2k database v1.1.1. In the North Atlantic and Alaska, the major climatic trend is characterized by long-term cooling interrupted by recent warming that started at the beginning of the 19th century. This cooling is visible in the Siberian region at two sites, warming at the others. The cooling of the Little Ice Age (LIA) was identified from the individual series, but it is characterized by wide-range spatial and temporal expression of climate variability, in contrary to the Medieval Climate Anomaly. The LIA started at the earliest by around AD 1200 and ended at the latest in the middle of the 20th century. The widespread temporal coverage of the LIA did not show regional consistency or particular spatial distribution and did not show a relationship with archive or proxy type either. A focus on the last 2 centuries shows a recent warming characterized by a well-marked warming trend parallel with increasing greenhouse gas emissions. It also shows a multidecadal variability likely due to natural processes acting on the internal climate system on a regional scale. A ∼ 16-30-year cycle is found in Alaska and seems to be linked to the Pacific Decadal Oscillation, whereas ∼ 20-30-and ∼ 50-90-year periodicities characterize the North Atlantic climate variability, likely in relation with the Atlantic Multidecadal Oscillation. These regional features are probably linked to the sea ice cover fluctuations through ice-temperature positive feedback.

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“…ka BP in southern Greenland (Dahl-Jensen et al, 1998), and also a range of palaeoclimate data from terrestrial i9 records that suggest cooling began after c. 4.5 cal. ka BP (Kaplan et al, 2002;Larsen et al, 2011;Massa et al, 2012). Although this regional model provides a coherent fit between data and observations in southern Greenland, it relies on tightly prescribed ice margin and thickness data and lacks a physically realistic, 3-D thermo-mechanical model of ice sheet evolution.…”

Section: Regional Ice Sheet Modelsmentioning

confidence: 99%

Using relative sea-level data to constrain the deglacial and Holocene history of southern Greenland

Woodroffe

Long

Lecavalier

et al. 2014

Quaternary Science Reviews

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. (2014) 'Using relative sea-level data to constrain the deglacial and Holocene history of southern Greenland.', Quaternary science reviews., 92 . pp. 345-356. Further information on publisher's website:http://dx.doi.org/10.1016/j.quascirev.2013.09.008Publisher's copyright statement: NOTICE: this is the author's version of a work that was accepted for publication in Quaternary Science Reviews. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Quaternary Science Reviews, 92, 2014Reviews, 92, , 10.1016Reviews, 92, /j.quascirev.2013 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. i2

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A multiproxy evaluation of Holocene environmental change from Lake Igaliku, South Greenland

Cited by 39 publications

References 73 publications

Response of Lacustrine Biota to Late Holocene Climate and Environmental Conditions in Northernmost Ungava (Canada)

Response of Lacustrine Biota to Late Holocene Climate and Environmental Conditions in Northernmost Ungava (Canada)

Climate variability in the subarctic area for the last 2 millennia

Using relative sea-level data to constrain the deglacial and Holocene history of southern Greenland

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