Chemical denudation rates in the Bayelva Catchment, Svalbard, in the Fall of 2000

Krawczyk, Wiesława Ewa; Lefauconnier, Bernard; Pettersson, Lars-Evan

doi:10.1016/j.pce.2003.08.054

Cited by 31 publications

(43 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, heterotrophic unicellular flagellates of the phylum Telonemia (79)(80)(81) increased in relative abundance during this period. Members of the phylum Telonemia have been reported in freshwater (82,83) and in Svalbard (e.g., in the Bayelva River [84]) previously. Although the higher contribution of Telonemia members in the summer/autumn at IsA may have originated from the two large rivers adjoining Adventfjorden, as hypothesized for Telonemia members in Kongsfjorden (85), their presence during winter suggests that marine Telonemia taxa were also present.…”

Section: Discussionmentioning

confidence: 94%

Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway)

Marquardt

Vader²,

Stübner

et al. 2016

Appl Environ Microbiol

113

107

View full text Add to dashboard Cite

bThe Adventfjorden time series station (IsA) in Isfjorden, West Spitsbergen, Norway, was sampled frequently from December 2011 to December 2012. The community composition of microbial eukaryotes (size, 0.45 to 10 m) from a depth of 25 m was determined using 454 sequencing of the 18S V4 region amplified from both DNA and RNA. The compositional changes throughout the year were assessed in relation to in situ fjord environmental conditions. Size fractionation analyses of chlorophyll a showed that the photosynthetic biomass was dominated by small cells (<10 m) most of the year but that larger cells dominated during the spring and summer. The winter and early-spring communities were more diverse than the spring and summer/autumn communities. Dinophyceae were predominant throughout the year. The Arctic Micromonas ecotype was abundant mostly in the early-bloom and fall periods, whereas heterotrophs, such as marine stramenopiles (MASTs), Picozoa, and the parasitoid marine alveolates (MALVs), displayed higher relative abundance in the winter than in other seasons. Our results emphasize the extreme seasonality of Arctic microbial eukaryotic communities driven by the light regime and nutrient availability but point to the necessity of a thorough knowledge of hydrography for full understanding of their succession and variability. Microbial eukaryotes are critically important for the functioning of marine ecosystems as primary producers (1, 2) and consumers (3, 4) of carbon, as well as maintainers of biogeochemical cycles (5-7). In Arctic waters, where marine planktonic cyanobacteria are infrequent, marine microbial eukaryotes are the predominant primary producers (8-10). In spite of their importance, our knowledge of the diversity and role of picosized (0.2 to 2 m) and nanosized (2 to 20 m) (11) eukaryotic plankton is still limited in extreme areas.High-Arctic regions are characterized by extreme seasonality in light conditions, with 24 h of sunlight in summer giving way to several months of complete darkness in winter. The cold, dark polar night period at high latitudes strongly limits the activity of autotrophic organisms, and Arctic species in general have to adjust to the timing of seasonal events (12). The few studies performed during the Arctic winter-spring transition suggest a strong seasonal response by the microbial community to irradiance (13)(14)(15). Most studies of Arctic microbial eukaryotes have so far utilized traditional identification techniques, such as microscopy, and focused on bloom-forming pelagic protists (4, 16-18). The development of molecular techniques, especially high-throughput sequencing (HTS), has made it possible to study the diversity and assemblages of pico-and nanosized eukaryotic plankton as well (19)(20)(21)(22). This has resulted in several diversity surveys of microbial eukaryotes from the Arctic Ocean and the shelf seas (23-27). Pico-and nanosized planktons are now known to govern major processes in the oceans to a larger degree than previously assumed (6,7,28,29). Furthermore, 18S ...

show abstract

Section: Discussionmentioning

confidence: 94%

Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway)

Marquardt

Vader²,

Stübner

et al. 2016

Appl Environ Microbiol

113

107

View full text Add to dashboard Cite

show abstract

“…Here, we use a compiled set of solute data, consisting of sixty-four previously published analyses from 2007 to 2009 (described in detail by Yde et al 2014), together with thirteen analyses from samples from 2013. We only include samples collected during the peak flow period in July and August because inclusion of samples collected during the early and late melt season may cause an overestimation of annual transports (Krawczyk, Lefauconnier, and Pettersson 2003;Stachnik et al 2016;Yde et al 2008). We present concentrations and transport of major ions (Na We use the discharge-weighted method, where measured ion concentrations are multiplied by the discharge at the time of sampling.…”

Section: Solute Fluxmentioning

confidence: 99%

Observed sediment and solute transport from the Kangerlussuaq sector of the Greenland Ice Sheet (2006–2016)

Hasholt

Mikkelsen

et al. 2018

Arctic, Antarctic, and Alpine Research

View full text Add to dashboard Cite

New measurements of Watson River sediment and solute concentrations and an extended river discharge record improved by acoustic Doppler current profiler (ADCP) measurements are used to calculate the total sediment and solute transport from a large ice-sheet sector in southern west Greenland. For the 2006-2016 period, the mean annual sediment and solute transport was 17.5 ± 7.2 × 10 6 t and 85 ± 30 × 10 3 t, respectively (standard deviation given). The highest annual transport occurred in 2010, attaining values of 29.6 × 10 6 t and 138 × 10 3 t, respectively. The corresponding annual average values of specific transport are 1.39 × 10 3 t km −2 a −1 for sediment and 6.7 t km −2 a −1 for solutes from the approximately 12,600 km 2 (95% ice covered) catchment, yielding an area-average erosion rate of 0.5 mm a −1. The specific transport is likely several times higher under the ice sheet near the margin where all meltwater passes than it is in the interior where the ice sheet is frozen to the bed. We conclude that the Greenland Ice Sheet is a large supplier of sediment and solutes to the surrounding fjords and seas. We find that the proglacial area can be a net source of sediments during high floods and we confirm that an increased amount of meltwater-transported sediments can explain the expansion of deltas around Greenland, contradictory to delta erosion observed elsewhere in the Arctic in recent years. ARTICLE HISTORY

show abstract

“…The chemical composition of glacial meltwaters in Svalbard has been subject to increased interest in recent years [34][35][36][37]. Waters originating from glaciers affect the quantity and quality of water delivered to the environment in glaciated catchments, which also plays an important role in ice mass dynamics [13].…”

Section: Glacier Water Chemistry and The Origin Of Chemical Additionsmentioning

confidence: 99%

“…[49] discusses the effect of pollutants Figure 9. Types of research performed on inanimate samples collected in the Svalbard archipelago [12,34,35,38,40,49,55,[65][66][67][68][69][70][71][72][73][74][75][76][77].…”

Section: Projects Listed Inmentioning

confidence: 99%

“…This is the only work providing an insight into the transport of anthropogenic pollutants through almost all of the elements of the glacial catchment. A considerable number of publications focus on the chemical weathering process [12,34,35,38,75]. Others concern seasonal changes in hydrochemistry [68,76], or compare the hydrochemistry of inanimate samples collected in different parts of the environment [66,72].…”

Section: Projects Listed Inmentioning

confidence: 99%

See 1 more Smart Citation

Glaciers as an Important Element of the World Glacier Monitoring Implemented in Svalbard

Lehmann‐Konera¹,

Ruman²,

Kozioł³

et al. 2017

Glaciers Evolution in a Changing World

View full text Add to dashboard Cite

Glaciers are not only contributors to the sea level rise but also important players in the circulation of pollutants. Over a billion people apply glacial waters for domestic purposes; hence, both the quality and quantity of this water should be monitored. In this chapter, we concentrate on the archipelago Svalbard in the Arctic, a typical target area for xenobiotics from long range atmospheric transport (LRAT), holding an important share of the Arctic glacial ice cover. Literature review has been conducted over both the cryospheric metrics and the achievements of analytical chemistry in the environmental monitoring. Svalbard is a relatively well-monitored part of the Arctic, with 17 glaciers regularly monitored for mass balance. In the chemical records of glaciers, a variety of substances have been determined, e.g., ions, heavy metals, or persistent organic pollutants (POPs), with the use of precise analytical techniques. However, knowledge gaps persist, preventing a formation of a reliable chemical inventory of Svalbard glaciers. Moreover, detailed studies on the deposition and transport of pollutants, rather than focusing on their presence only, are crucial future research recommendations.

show abstract

Chemical denudation rates in the Bayelva Catchment, Svalbard, in the Fall of 2000

Cited by 31 publications

References 33 publications

Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway)

Strong Seasonality of Marine Microbial Eukaryotes in a High-Arctic Fjord (Isfjorden, in West Spitsbergen, Norway)

Observed sediment and solute transport from the Kangerlussuaq sector of the Greenland Ice Sheet (2006–2016)

Glaciers as an Important Element of the World Glacier Monitoring Implemented in Svalbard

Contact Info

Product

Resources

About