Preface: the international polar year project ‘kinnvika’– arctic warming and impact research at 80° n

Pohjola, Veijo; Kankaanpää, Paula; Moore, John C.; Pastusiak, Tadeusz

doi:10.1111/j.1468-0459.2011.00436.x

Cited by 12 publications

(16 citation statements)

References 26 publications

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“…1A), and lies between the Vestfonna glacier (∼8 km) and Isvika bay (∼0.5 km) in the southern Murchisonfjorden (Fig. Mean annual and July air temperatures in the region are −8 and +2°C, respectively (Pohjola et al 2011). Lake Einstaken drains into Isvika bay and is occasionally connected to adjacent Lake Krystallvattnet (64 m a.s.l.)…”

Section: Study Sitementioning

confidence: 99%

“…The bedrock consists of dolomites, limestones, shales and sandstones, and the catchment is characterized by highly weathered substrates, discontinuous till patches, and periglacial features with extremely scarce vegetation (scattered Saxifraga, Dryas and mosses) and undeveloped soils. Mean annual and July air temperatures in the region are −8 and +2°C, respectively (Pohjola et al 2011).…”

Section: Study Sitementioning

confidence: 99%

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Ultraviolet radiation exposure of a high arctic lake in Svalbard during the Holocene

Nevalainen

Rantala

Luoto

et al. 2014

Boreas

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Long‐term fluctuations in lake‐water optical properties were examined using a Holocene sediment sequence and multi‐proxy palaeolimnological approach in Lake Einstaken, Nordaustlandet, Svalbard. UV‐absorbance of sedimentary cladoceran remains provided information on underwater UV exposure and changes in lake‐catchment coupling processes were inferred from sediment geochemistry. In addition, aquatic community succession was used as an indicator for lake‐water bio‐optical properties and a Holocene record of sun activity (sunspots) was utilized to evaluate long‐term solar forcing. The results indicated that the UV‐absorbance of cladoceran remains was highest (i.e. maximum UV‐induced pigmentation) for a short period during the early Holocene and for several millennia during the mid‐Holocene. Sun activity was high during these time intervals, probably impacting the UV intensities, but it is probable that the amount of UV‐attenuating compounds (e.g. dissolved organic carbon (DOC)) also significantly affected the underwater UV environment and were low during high UV exposure. Benthic autotrophic communities also responded to the millennial changes in lake‐water optical properties. UV‐resistant Nostoc cyanobacterial colonies were established during the mid‐Holocene, indicative of high underwater UV intensities, and Fontinalis mosses thrived during the early Holocene, indicating a highly transparent water column. The results further suggested that underwater UV exposure decreased during the late Holocene, which is probably attributable to increased DOC and decreased solar forcing. Owing to the location of Lake Einstaken and its catchment in the periglacial barren landscape of the polar desert, the fluctuations of bio‐optical lake‐water properties were apparently forced by postglacial environmental processes and Holocene climate development. These factors controlled sea shoreline proximity, water discharge, ice‐cover duration and littoral‐benthic primary production and further affected the underwater UV environment. Although the role of solar forcing cannot be underestimated, the current record emphasizes the role of climate‐mediated lake‐catchment interactions in impacting bio‐optical properties and UV exposure of high arctic aquatic systems.

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Section: Study Sitementioning

confidence: 99%

Section: Study Sitementioning

confidence: 99%

Ultraviolet radiation exposure of a high arctic lake in Svalbard during the Holocene

Nevalainen

Rantala

Luoto

et al. 2014

Boreas

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“…The catchment is comprised of arctic desert with an annual precipitation about 400 mm of (Hagen et al 1993), most of it as snow. The mean annual temperature is −8°C, and that of July about +3°C (Pohjola et al 2011).…”

Section: Regional Settingmentioning

confidence: 99%

“…Annual and seasonal temperatures have been generally rising, and the sea−ice extent and volume have been declining with an ice loss unmatched in the last thousand years and unexplainable by any known natural variabiliy (e.g. Solomon et al 2007;Kwok et al 2009;Polyak et al As one of the activities of the International Polar Year 2007Year -2009, an expedition was organised to the Murchisonfjorden area, Nordaustlandet (Pohjola et al 2011). Earlier studies by Kaakinen et al (2009) and Kubischta et al (2010) indicated that coastal sections in Isvika bay contain glacial and marine sediment sequences extend− ing back to the beginning of the Weichselian glacial stage.…”

Section: Introductionmentioning

confidence: 99%

Holocene sedimentary environment of a High−Arctic fjord in Nordaustlandet, Svalbard

Ojala¹,

Salonen²,

Moskalik³

et al. 2014

Polish Polar Research

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A 2.5−metre−long marine core from Isvika bay in Nordaustlandet (80°N, 18°E) was AMS 14 C dated and analysed for its sedimentological and magnetic parameters. The studied record was found to cover the entire Holocene and indicates major turnovers in the palaeo− hydrography and sedimentary depositional history. The area was deglaciated at around 11,300 BP. The early Holocene has indications of rapid melting of glaciers and frequent depo− sition of ice−rafted debris (IRD). The climatic optimum terminated with a probable glacier re−advance event occurring ca. 5800 cal BP. This event caused the deposition of a diamicton unit in Isvika bay, followed by a shift towards a colder and a more stratified hydrographic set− ting. The reduction in IRD indicates gradual cooling, which led to the stratification of the bay and eventually to more persistent fast sea−ice conditions by 2500 cal BP. For the last 500 years, Isvika has again been seasonally open.

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“…In the framework of the IPY (International Polar Year) Kinnvika project (Pohjola et al . 2011) and its follow‐on activities several field campaigns with focus on snow‐cover related fieldwork were carried out during seven individual field campaigns on Nordaustlandet, Svalbard, in the period 2007–2010.…”

Section: Introductionmentioning

confidence: 99%

Snowpack characteristics of vestfonna and de geerfonna (nordaustlandet, svalbard) – a spatiotemporal analysis based on multiyear snow‐pit data

Möller

Beaudon

et al. 2011

Geografiska Annaler: Series A, Physical Geography

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Extensive glaciological field measurements were carried out on the ice cap Vestfonna as well as on the minor ice body De Geerfonna (Nordaustlandet, Svalbard) within the framework of IPY Kinnvika. Field campaigns were conducted during the period 2007-2010 in spring (April/May) and summer (August). In this study we compile and present snow cover information obtained from 22 snow pits that were dug on Vestfonna during this period. Locations are along two transects on the northwestern, land terminating slope of the ice cap, on its central summit, Ahlmann Summit, and at a set of several other locations in the eastern and northern part of the ice cap. Snow-cover information acquired from four snow pits on adjacent De Geerfonna is also incorporated in this study. Field data are analysed regarding snow stratigraphy, snow density, snow hardness and snow temperature. Results reveal mean snow densities of around 400 kg m -3 for the snowpack of Vestfonna with no apparent spatial or interannual variability. A distinctly higher value of more than 450 kg m -3 was obtained for De Geerfonna. A spatial comparison of snow water equivalents above the previous end-ofsummer surface serves for obtaining insights into the spatial distribution of snow accumulation across Vestfonna. Altitude was found to be the only significant spatial parameter for controlling snow accumulation across the ice cap. IntroductionIn the framework of the IPY (International Polar Year) Kinnvika project ) and its follow-on activities several field campaigns with focus on snow-cover related fieldwork were carried out during seven individual field campaigns on Nordaustlandet, Svalbard, in the period 2007-2010. Snow cover conditions were investigated on the ice cap Vestfonna as well as the neighbouring minor ice body De Geerfonna. Snow-cover related fieldwork on Vestfonna focused on two transects along the northwestern slope of the ice cap and on its main ridges, including the two highest points,

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Preface: the international polar year project ‘kinnvika’– arctic warming and impact research at 80° n

Abstract: Pohjola, V.A., Kankaanpää, P., Moore, J.C. and Pastusiak, T., 2011. The International Polar Year Project ‘KINNVIKA’– Arctic warming and impact research at 80° N. Geografiska Annaler, Series A, Physical Geography, 93, 201–208. DOI: 10.1111/j.1468‐0459.2011.00436.x

Cited by 12 publications

References 26 publications

Ultraviolet radiation exposure of a high arctic lake in Svalbard during the Holocene

Ultraviolet radiation exposure of a high arctic lake in Svalbard during the Holocene

Holocene sedimentary environment of a High−Arctic fjord in Nordaustlandet, Svalbard

Snowpack characteristics of vestfonna and de geerfonna (nordaustlandet, svalbard) – a spatiotemporal analysis based on multiyear snow‐pit data

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