Climatic history of Ny-Alesund region, Svalbard, over the last 19,000 yr: Insights from quartz grain microtexture and magnetic susceptibility

Kar, Ratan; Mazumder, Abhijit; Mishra, Kriti; Patil, Shrikant; Ravindra, Rasik; Ranhotra, Parminder Singh; Govil, Pawan; Bajpai, Ruchika; Singh, Kajal

doi:10.1016/j.polar.2018.04.004

Cited by 11 publications

(3 citation statements)

References 34 publications

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“…Nevertheless, fluvial collision contributed to their shaping, because numerous crescentic marks occur (Vos et al 2014). Importantly, in case of sample R9, a glacigenic grain record with high pressure fracturing such as straight and curved grooves and chattermarks (Kar et al 2018;Mazumder et al 2017) should be expected due to the proximity to unit 1, which has been interpreted as a basal till bed by Zelcš and Markots (2004). Instead, these grains originate from an aquatic environment of relatively low energy.…”

Section: Depositional Environmentsmentioning

confidence: 90%

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

Kalińska

Alexanderson

Krievāns

2020

Geografiska Annaler: Series A, Physical Geography

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In interstadial deposits, sand interbeds gain limited consideration in comparison with organic sediments, and therefore tend to be underrepresented in palaeoenvironmental reconstructions. The Raunis site, central-eastern Latvia, is an example where organic beds have already gained some attention and been used to understand the complex interactions between advance and retreat of the Scandinavian Ice Sheet in the region. Sandy interlayers have so far not been investigated in detail and their time of deposition has also been unknown, therefore exploring these clastic-organic sediment alternation is of interest. This study provides a new set of luminescence datings along with sedimentological information from the character of individual quartz grains as detected from scanning electron microscope (SEM) analysis. Sandy interlayers are dated to between 12 ka and 122 ka. Fast component OSL signal dominates in all investigated samples, but several samples have broad and/or skewed dose distributions. Only one sample is considered reliable and provides an age Authors' accepted manuscript (revised version after peer review, prior to journal layout and proofs) of 12.0±0.6 ka. A radiocarbon age from organic sediments in the same unit yields an age of 14,025±270 cal y BP. These two dates do not agree within 2 sigma, and this is likely related to reservoir and hard water effects of the radiocarbon sample. Sediments at the Raunis site fall into the Greenland Interstadial 1 (GI-1), but more detailed specification is not possible. The rest of the OSL ages are older than expected, likely due to incomplete bleaching during deposition. This means that stratigraphic reliability of this key site is likely hampered for further regional correlation.

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Section: Depositional Environmentsmentioning

confidence: 90%

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

Kalińska

Alexanderson

Krievāns

2020

Geografiska Annaler: Series A, Physical Geography

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“…In fact, unit 10-70 cm was deposited between 2219 BP and 1900 AD (Yang et al 2020a), and large extensive glaciers only happened during the LIA (Grabiec et al 2018;Mangerud and Landvik 2007;Røthe et al 2015). Moreover, till sediments caused by glacial activity in the upper part of a trench was also discovered near the coast of Ny-Ålesund (Kar et al 2018).…”

Section: Holocene Climate Changementioning

confidence: 99%

Palaeo-notch sediments as reliable proxy records for climate change and anthropogenic activities: a short review

et al. 2021

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Over the past decades, many proxy materials (for example, lacustrine sediments, marine sediments, ice cores, loess, and tree rings) have been used to reconstruct palaeoclimatic and palaeoenvironmental changes. A new proxy material, palaeo-notch sediment, was reported in 2006, and since then many studies have been published for palaeoclimatic and palaeoenvironmental reconstruction using palaeo-notch sediments. In this paper, we introduced the palaeo-notch sediments in detail, and reviewed the state of knowledge on the Holocene climate changes, ecological responses to climate change and environmental impacts of anthropogenic activities based on the published research using palaeo-notch sediments. We also summarised five advantages of using palaeo-notch sediments for palaeoenvironmental studies. The palaeo-notch sediments may be available in the coastal regions from the Arctic, Antarctic and many other parts of the world. Therefore, sediments in palaeo-notches could provide valuable information for the study of palaeoclimate and palaeoenvironment in coastal regions.

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“…During warm-humid periods, the supply of magnetic minerals in to the sediments is enhanced due to weathering. Therefore, the phases of greater susceptibility, within the profile, can be used to identify the periods of climatic amelioration; whereas during cold-arid phases, weathering is reduced and thus, the susceptibility [9,10].…”

Section: Introductionmentioning

confidence: 99%

Early onset of aridity in the past millennium: Insights from vegetation dynamics and climate change in the alpine, cold-desert region of Trans Himalaya, India

Mohanty,

Mishra,

Mishra

et al. 2024

PLoS ONE

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Palynological analysis of surface soil and sub-surface sediments from the outwash plain of Hamtah Glacier, Lahaul-Spiti, India, has brought out the vegetation and climatic changes in the area during the last 1580 years. The arboreal and non-arboreal pollen ratio (AP/NAP) has been used to demarcate the different vegetation and climatic zones, complemented by the frequencies of the broad-leaved taxa. Lower values of thermophilous, broad-leaved arboreal taxa, indicate that the region experienced cold-arid conditions between 1580 and 1330 yr BP (AD 370–620); which can be related to the Dark Ages Cold Period (DACP). Thereafter, between 1330 and 950 yr BP (AD 620–1000), a rejuvenation of the broad-leaved elements reflects the initiation of a comparatively warm and moist phase, marking the Medieval Climatic Anomaly (MCA) in the region. The warm-moist phase was, however, short-lived, and from 950 yr BP to the Present (AD 1000 onwards), the region saw a return to cold-arid conditions, as evidenced by a sharp fall in the AP/NAP ratio. This cold-arid phase was, nevertheless, punctuated by a warm-moist period during 790 to 680 yr BP (AD 1160–1270), which marks the terminal phase of the MCA. After the termination of the MCA, the Little Ice Age (LIA) is well-marked in the area. The culmination of the long cold-arid regime is characterized by warmer conditions over the last 160 years, which is the manifestation of the Current Warm Period (CWP). Magnetic susceptibility (χlf) and sediment geochemistry (Weathering Index of Parker) were also attempted to have a multi-proxy approach, and show a general compatibility with the palynological data. The palaeoclimatic evidences suggest shorter warm periods and extended colder phases during the last 1580 years; in this high-altitude, cold-desert, Trans Himalayan region.

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Climatic history of Ny-Alesund region, Svalbard, over the last 19,000 yr: Insights from quartz grain microtexture and magnetic susceptibility

Cited by 11 publications

References 34 publications

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

Palaeo-notch sediments as reliable proxy records for climate change and anthropogenic activities: a short review

Early onset of aridity in the past millennium: Insights from vegetation dynamics and climate change in the alpine, cold-desert region of Trans Himalaya, India

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Climatic history of Ny-Alesund region, Svalbard, over the last 19,000 yr: Insights from quartz grain microtexture and magnetic susceptibility

Cited by 11 publications

References 34 publications

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

The Raunis section, central Latvia, revisited: first luminescence results and re-evaluation of a key Baltic States stratigraphic site

Palaeo-notch sediments as reliable proxy records for climate change and anthropogenic activities: a short review

Early onset of aridity in the past millennium: Insights from vegetation dynamics and climate change in the alpine, cold-desert region of Trans Himalaya, India

Contact Info

Product

Resources

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Climatic history of Ny-Alesund region, Svalbard, over the last 19,000 yr: Insights from quartz grain microtexture and magnetic susceptibility