Particle sedimentation patterns in the eastern Fram Strait during 2000–2005: Results from the Arctic long-term observatory HAUSGARTEN

Bauerfeind, Eduard; Nöthig, Eva‐Maria; Beszczynska, Agnieszka; Fahl, Kirsten; Kaleschke, Lars; Kreker, Kathrin; Klages, Michaël; Soltwedel, Thomas; Lorenzen, Christiane; Wegner, Jan Dirk

doi:10.1016/j.dsr.2009.04.011

Cited by 118 publications

(103 citation statements)

References 67 publications

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“…Sinking fluxes of biogenic material are ten times lower during the winter 30 , thus as predicted elsewhere 2 , the atmospheric residence times during winter are expected to be much longer due to a lack of sequestration by the biological pump, with a consequent efficient transport to the AO. This will be facilitated by the fact that during the winter the Arctic atmosphere is more permeable to the Atlantic Ocean atmosphere 38 .…”

Section: Discussionmentioning

confidence: 69%

“…Bauerfeind and co-workers 30 have shown that most sinking fluxes of OC in the Eastern Fram Strait occur during the summer (the June-September period accounts for more than 60% of the annual export of OC) and the export of OC at 300-m depth accounts for ~10% of the gross primary productivity. It is then possible to estimate the removal of PCBs associated to sinking particles using these reported summer fluxes of OC and biogenic material for the Arctic summer (May to September), and the PCB concentrations measured in particles and plankton.…”

Section: Discussionmentioning

confidence: 99%

“…Where F Biogenic is the sinking flux of biogenic material as reported elsewhere (from 35 to 40 mg per m 2 per day) 30 and C P are the PCB concentrations measured in plankton. Figure 3 shows the estimated sinking fluxes for the GC and Fram Strait, respectively (Supplementary Table S5).…”

Section: Discussionmentioning

confidence: 99%

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The oceanic biological pump modulates the atmospheric transport of persistent organic pollutants to the Arctic

et al. 2012

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semivolatile persistent organic pollutants have the potential to reach remote environments, such as the Arctic ocean, through atmospheric transport and deposition. Here we show that this transport of polychlorinated biphenyls to the Arctic ocean is strongly retarded by the oceanic biological pump. A simultaneous sampling of atmospheric, seawater and plankton samples was performed in July 2007 in the Greenland Current and Atlantic sector of the Arctic ocean. The atmospheric concentrations declined during atmospheric transport over the Greenland Current with estimated half-lives of 1-4 days. These short half-lives can be explained by the high airto-water net diffusive flux, which is similar in magnitude to the estimated settling fluxes in the water column. Therefore, the decrease of atmospheric concentrations is due to sequestration of atmospheric polychlorinated biphenyls by enhanced air-water diffusive fluxes driven by phytoplankton uptake and organic carbon settling fluxes (biological pump).

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Section: Discussionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

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The oceanic biological pump modulates the atmospheric transport of persistent organic pollutants to the Arctic

et al. 2012

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“…Sedimentation and benthic food input are greatly influenced by productivity at the surface, and in Arctic waters, productivity is often concentrated at the ice edge (Schewe and Soltwedel, 2003;Bauerfeind et al, 2009;Hebbeln and Wefer, 1991). HG I is not usually covered by ice because of its easterly location within the Fram Strait, and examination of satellite-derived ice cover maps confirms that this is the case (K. Meyer, unpublished data).…”

Section: Interannual Differences In Megafaunal Densitiesmentioning

confidence: 98%

Interannual variation in the epibenthic megafauna at the shallowest station of the HAUSGARTEN observatory (79° N, 6° E)

Meyer¹,

Bergmann

Soltwedel

2013

Biogeosciences

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Epibenthic megafauna play an important role in the deep-sea environment and contribute significantly to benthic biomass, but their population dynamics are still understudied. We used a towed deep-sea camera system to assess the population densities of epibenthic megafauna in 2002, 2007, and 2012 at the shallowest station (HG I, ∼1300 m) of the deep-sea observatory HAUSGARTEN, in the eastern Fram Strait. Our results indicate that the overall density of megafauna was significantly lower in 2007 than in 2002, but was significantly higher in 2012, resulting in overall greater megafaunal density in 2012. Different species showed different patterns in population density, but the relative proportions of predator/scavengers and suspension-feeding individuals were both higher in 2012. Variations in megafaunal densities and proportions are likely due to variation in food input to the sea floor, which decreased slightly in the years preceding 2007 and was greatly elevated in the years preceding 2012. Both average evenness and diversity increased over the time period studied, which indicates that HG I may be food-limited and subject to bottom-up control. The community of HG I may be unique in its response to elevated food input, which resulted in higher evenness and diversity in 2012

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“…Estimated average primary production in the ice-covered central Arctic is low, on the order of 1 to 25 g C m (2 y (1 Wassmann et al 2010), with ice algae production contributing from 0 to 80% Wassmann et al 2008). Bauerfeind et al (2009) suggested very efficient processing of carbon within the water column, with B10% of primary production reaching the seafloor in the deep sea (Fram Strait). Low primary production and export flux result in low abundance of suspension feeders in the deep basins (Krö ncke et al 1998) and a dominance of deposit feeders (van Oevelen et al 2011).…”

Section: Permanent Ice Cover*high Arcticmentioning

confidence: 99%

Status and trends in the structure of Arctic benthic food webs

et al. 2015

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Particle sedimentation patterns in the eastern Fram Strait during 2000–2005: Results from the Arctic long-term observatory HAUSGARTEN

Cited by 118 publications

References 67 publications

The oceanic biological pump modulates the atmospheric transport of persistent organic pollutants to the Arctic

The oceanic biological pump modulates the atmospheric transport of persistent organic pollutants to the Arctic

Interannual variation in the epibenthic megafauna at the shallowest station of the HAUSGARTEN observatory (79° N, 6° E)

Status and trends in the structure of Arctic benthic food webs

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