Late Quaternary Environmental and Cultural Changes in the Wollaston Forland Region, Northeast Greenland

Bennike, Ole; Sørensen, Mikkel; Fredskild, Bent; Jacobsen, Bjarne H; Böcher, Jens; Amsinck, Susanne Lildal; Jeppesen, Erik; Andreasen, Claus; Christiansen, Hanne H.; Humlum, Ole

doi:10.1016/s0065-2504(07)00003-7

Cited by 40 publications

(58 citation statements)

References 43 publications

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“…Though earlier studies have suggested a deglaciation age of 11.7 to 10.1 ka (Bennike and Weidick, 2001;Bennike et al, 2008), the results of this investigation indicate that the Zackenberg lowlands may have been ice-free as early as 13 to 11 ka (Table 2;Figs. 7 and 8).…”

Section: Deglaciation and Sea-level Highstandcontrasting

confidence: 64%

“…4.5 ka (Bennike et al, 2008;Pedersen et al, 2011). The topography of the glacial and glaciofluvial landscape deposited during the DTST and DHST controlled the delta location.…”

Section: Delta Progradation and Relative Sea-level Fallmentioning

confidence: 99%

“…1), 90 km east of the Greenland Ice Sheet margin. This region was glaciated several times during the Quaternary period (Hjort, 1981;Funder et al, 1994;Bennike et al, 2008). The last glaciation culminated in the LGM during the late Weichselian, when the Greenland Ice Sheet extended across the region (Bennike et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

“…Intervening areas were covered by grounded but non-streaming ice, in some cases preserving pre-existing landforms (Funder et al, 2011). Deglaciation initiated in the coastal areas east of Young Sound between 10.1 and 11.7 ka (Bennike et al, 2008). The inner-fjord areas were ice-free by between 9.5 and 7.5 ka.…”

Section: Introductionmentioning

confidence: 99%

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Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

et al. 2017

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Abstract. The Zackenberg River delta is located in northeast Greenland (74 • 30 N, 20 • 30 E) at the outlet of the Zackenberg fjord valley. The fjord-valley fill consists of a series of terraced deltaic deposits (ca. 2 km 2 ) formed during relative sea-level (RSL) fall. We investigated the deposits using sedimentological and cryostratigraphic techniques together with optically stimulated luminescence (OSL) dating. We identify four facies associations in sections (4 to 22 m in height) exposed along the modern Zackenberg River and coast. Facies associations relate to (I) overriding glaciers, (II) retreating glaciers and quiescent glaciomarine conditions, (III) delta progradation in a fjord valley, and (IV) fluvial activity and niveo-aeolian processes. Pore, layered, and suspended cryofacies are identified in two 20 m deep ice-bonded sediment cores. The cryofacies distribution, together with low overall ground-ice content, indicates that permafrost is predominately epigenetic in these deposits. Fourteen OSL ages constrain the deposition of the cored deposits to between approximately 13 and 11 ka, immediately following deglaciation. The timing of permafrost aggradation was closely related to delta progradation and began following the subaerial exposure of the delta plain (ca. 11 ka). Our results reveal information concerning the interplay between deglaciation, RSL change, sedimentation, permafrost aggradation, and the timing of these events. These findings have implications for the timing and mode of permafrost aggradation in other fjord valleys in northeast Greenland.

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Section: Deglaciation and Sea-level Highstandcontrasting

confidence: 64%

“…4.5 ka (Bennike et al, 2008;Pedersen et al, 2011). The topography of the glacial and glaciofluvial landscape deposited during the DTST and DHST controlled the delta location.…”

Section: Delta Progradation and Relative Sea-level Fallmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

et al. 2017

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“…Similarly, McGowan et al (2005) used fossil time series to demonstrate that shifts between turbid and clear-water states of shallow lakes arise from the combined effects of climate and eutrophication but found no clear evidence that these ''alternative'' states were capable of existing under similar environmental conditions. Likewise, analysis of the sediments of a high Arctic lake shows that dramatic reductions in Daphnia and chironomid abundance during the mid-Holocene warm period (Bennike et al 2008) are more consistent with changes in hydrologic connectivity, colonization by fish, and predator-prey regimes than with the direct effects of E influx. Together, these and other studies demonstrate both that paleoecological studies can benefit from the explicit tests of modern theory and that retrospective studies are capable of generating new insights for the development of predictive theory.…”

Section: Future Challenges and Opportunitiesmentioning

confidence: 98%

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Leavitt

Fritz

Anderson

et al. 2009

Limnology & Oceanography

171

174

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The premise of this article is that climate effects on lakes can be quantified most effectively by the integration of process-oriented limnological studies with paleolimnological research, particularly when both disciplines operate within a common conceptual framework. To this end, the energy (E)-mass (m) flux framework (Em flux) is developed and applied to selected retrospective studies to demonstrate that climate variability regulates lake structure and function over diverse temporal and spatial scales through four main pathways: rapid direct transfer of E to the lake surface by irradiance, heat, and wind; slow indirect effects of E via changes in terrestrial development and subsequent m subsidies to lakes; direct influx of m as precipitation, particles, and solutes from the atmosphere; and indirect influx of water, suspended particles, and dissolved substances from the catchment. Sedimentary analyses are used to illustrate the unique effects of each pathway on lakes but suggest that interactions among mechanisms are complex and depend on the landscape position of lakes, catchment characteristics, the range of temporal variation of individual pathways, ontogenetic changes in lake basins, and the selective effects of humans on m transfers. In particular, preliminary synthesis suggests that m influx can overwhelm the direct effects of E transfer to lakes, especially when anthropogenic activities alter m subsidies from catchments.The structure and function of lake ecosystems is regulated by complex interactions among climate, humans, ecosystem morphology, and catchment characteristics, each of which varies in time and space (Schindler 2001). For example, climatic controls range from daily meteorological variations in local irradiance, temperature, and water fluxes (Keller 2007) through to large-scale interactions of the atmosphere and oceans (Trenberth and Hurrell 1994;Hurrell 1995;Mantua et al. 1997) and millennium-long changes in energy (E) and mass (m) flux around the planet (Williams et al. 1997;Diffenbaugh et al. 2006). Within this framework, chemical, physical, and ecological processes combine to determine the production and composition of aquatic communities, both uniquely and in consort with other mechanisms (Carpenter 1999). In addition, lakes are affected both by human disturbance of biotic communities and biogeochemical cycles (e.g., land use, urbanization, fisheries management) and by creation of novel stressors (e.g., acidic precipitation, toxicants, ozone loss). However, because these factors interact over diverse spatial and temporal scales, it is difficult to determine the relative importance of regulatory processes using only traditional site-based observation and experimentation. Instead, it is the premise of this article that the combined use of limnology and paleoecology represents the best means to quantify and scale interactions between climate and other control mechanisms and to develop a hierarchical understanding of how these regulatory processes are likely to influence lakes pres...

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Interglacial Biotas from the North Atlantic Islands

Bennike

Böcher²

2021

Biogeography in the Sub‐Arctic

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Late Quaternary Environmental and Cultural Changes in the Wollaston Forland Region, Northeast Greenland

Cited by 40 publications

References 43 publications

Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

Cryostratigraphy, sedimentology, and the late Quaternary evolution of the Zackenberg River delta, northeast Greenland

Paleolimnological evidence of the effects on lakes of energy and mass transfer from climate and humans

Interglacial Biotas from the North Atlantic Islands

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