Holocene aeolian sedimentation and episodic mass-wasting events recorded in lacustrine sediments on Langøya in Vesterålen, northern Norway

Nielsen, Pål Ringkjøb; Dahl, Svein Olaf; Jansen, Henrik Løseth; Støren, Eivind

doi:10.1016/j.quascirev.2016.07.011

Cited by 15 publications

(11 citation statements)

References 97 publications

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“…It is thus likely that this debris flow fan was most active during the Holocene. This is in accordance with a study from Langøya, 60 km southwest of the study showing an intensification in debris flow activity during the latter part of the Holocene (Nielsen et al 2016b). Furthermore, Vasskog et al (2011) argue that most of their records of mass-wasting events show an increasing tend throughout the Holocene.…”

Section: Interpretation Of Lithologysupporting

confidence: 91%

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Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low‐Arctic valley Finnkongdalen, Andøya, northern Norway

Jansen

Dahl

Linge

et al. 2023

Boreas

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Continuous glacier margin and equilibrium‐line altitude fluctuations of a former glacier on central Andøya, northern Norway, are reconstructed during the Lateglacial based on moraines and AMS 14C‐dated sediments from the distal glacier‐fed lake Ner‐Finnkongdalsvatnet. The results indicate that a valley glacier occupied the entire valley during the Last Glacial Maximum (before 21 970±620 cal. a BP). The glacier remained large throughout the early Lateglacial until a significant glacier retreat took place about 14 300±330 cal. a BP. Major advances occurred during the Older Dryas (OD) and during the Younger Dryas (YD), while minor advances are suggested to have taken place during the Intra Allerød Cold Period and the Late Allerød Cooling. Additionally, three smaller glacier retreats/re‐advances within the YD are suggested to have taken place, the latter being the largest. The glacier re‐formations/advances during the Lateglacial are consistent with increases in temperature, and they are thus suggested to be the result of increased winter precipitation. Comparing the results with relevant glacier and sea‐surface temperature records, a south–north migration of storm tracks may have occurred between 12 100–11 810±220 cal. a BP. The high temporal resolution of local glacier activity in Finnkongdalen improves our understanding of the climate forcing of the regional glacier fluctuations of the northwestern sector of the Scandinavian Ice Sheet during the Skarpnes‐ (OD) and Tromsø‐Lyngen (YD) re‐advances.

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Section: Interpretation Of Lithologysupporting

confidence: 91%

“…This is in accordance with a study from Langøya, 60 km southwest of the study showing an intensification in debris flow activity during the latter part of the Holocene (Nielsen et al . 2016b). Furthermore, Vasskog et al .…”

Section: Discussionmentioning

confidence: 99%

Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low‐Arctic valley Finnkongdalen, Andøya, northern Norway

Jansen

Dahl

Linge

et al. 2023

Boreas

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“…Extreme climatological events can trigger several high-energy transport mechanisms which could induce deposition of these elements in lake sediments. Depending on the processes, extreme events may induce different sedimentary structures containing coarse grains (Arnaud et al, 2002;Sletten et al, 2003;Nielsen et al, 2016). Fluvial events such as floods are able to transport very large quantities of sediment in a short period of time (Sturm and Matter, 1978;Jenny et al, 2014).…”

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confidence: 99%

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

et al. 2017

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Abstract. Over the past decades, X-ray computed tomography (CT) has been increasingly applied in the geosciences community. CT scanning is a rapid, non-destructive method allowing the assessment of relative density of clasts in natural archives samples. This study focuses on the use of this method to explore instantaneous deposits as major contributors to sedimentation of high-elevation lakes in the Alps, such as the Lake Lauvitel system (western French Alps). This lake is located within a very steep valley prone to episodic flooding and features gullies ending in the lake. This variety of erosion processes leads to deposition of sedimentary layers with distinct clastic properties. We identified 18 turbidites and 15 layers of poorly sorted fine sediment associated with the presence of gravels since AD 1880. These deposits are respectively interpreted as being induced by flood and wet avalanche. This constitutes a valuable record from a region where few historical records exist. This CT scan approach is suitable for instantaneous deposit identification to reconstruct past evolution and may be applicable to a wider variety of sedimentary archives alongside existing approaches.

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“…Nielsen, 2003) and might therefore influence REVEALS reconstructions. We also know that wind speed and direction changed through the Holocene (e.g., Björckl and Clemmensen, 2004;de Jong et al, 2007 and2006;Nielsen et al, 2016), but such studies are too few to be considered in REVEALS reconstructions for a whole continent. So far, REVEALS reconstructions of plant cover assume a constant wind speed through space and time, 3 m/s for Europe.…”

Section: Caveats Of the Reveals Model And Pollen-based Reconstruction...mentioning

confidence: 99%

The challenge of comparing pollen-based quantitative vegetation reconstructions with outputs from vegetation models – a European perspective

Dallmeyer

Poska

Marquer

et al. 2023

Preprint

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Abstract. We compare Holocene tree-cover changes in Europe derived from a transient MPI-ESM1.2 simulation with high spatial resolution LPJ-GUESS time-slice simulations and pollen-based quantitative reconstructions of tree cover based on the REVEALS model. The dynamic vegetation models and REVEALS agree with respect to the general temporal trends in tree cover for most parts of Europe, with a large tree cover during the mid-Holocene and a substantially smaller tree cover closer to the present time. However, the decrease in tree cover in REVEALS starts much earlier than in the models indicating much earlier anthropogenic deforestation than the prescribed land-use in the models. While LPJ-GUESS generally overestimates tree cover compared to the reconstructions, MPI-ESM indicates lower percentages of tree cover than REVEALS, particularly in Central Europe and the British Isles. A comparison of the simulated climate with chironomid-based climate reconstructions reveals that model-data mismatches in tree cover are in most cases not driven by biases in the climate. Instead, sensitivity experiments indicate that the model results strongly depend on the tuning of the models regarding natural disturbance regimes (e.g. fire and wind throw). The frequency and strength of disturbances are – like most of the parameters in the vegetation models – static and calibrated to modern conditions. However, these parameter values may not be valid during climate and vegetation states totally different from todays. In particular, the mid-Holocene natural forests were probably more stable and less sensitive to disturbances than present day forests that are heavily altered by human interventions. Our analysis highlights the fact that such model settings are inappropriate for palaeo-simulations and complicate model-data comparisons with additional challenges. Moreover, our study suggests that land-use is the main driver of forest decline in Europe during the mid- and late-Holocene.

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Holocene aeolian sedimentation and episodic mass-wasting events recorded in lacustrine sediments on Langøya in Vesterålen, northern Norway

Cited by 15 publications

References 97 publications

Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low‐Arctic valley Finnkongdalen, Andøya, northern Norway

Palaeoclimatic and regional implications of Older Dryas and Younger Dryas local glacier activity in the low‐Arctic valley Finnkongdalen, Andøya, northern Norway

A new CT scan methodology to characterize a small aggregation gravel clast contained in a soft sediment matrix

The challenge of comparing pollen-based quantitative vegetation reconstructions with outputs from vegetation models – a European perspective

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