Intercalibration of benthic flux chambers I. Accuracy of flux measurements and influence of chamber hydrodynamics

Tengberg, Anders; Ståhl, Henrik; Gust, G.; Müller, Vasco; Arning, U.; Andersson, Helén; Hall, Per

doi:10.1016/j.pocean.2003.12.001

Cited by 91 publications

(84 citation statements)

References 56 publications

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“…Nevertheless, OPD was much shallower during May compared to March, suggesting these sediments had also undergone reactive changes in response to the bloom which were not captured in the incubation measurements, potentially because very little labile carbon was left in the sediments at the time of incubation. Core incubation measurements are most representative of the in situ conditions if they are collected from shallow depths, as seen here with a depth of *100 m, and the cores are kept at the representative in situ water temperature with a well-mixed overlying water layer (Glud 2008;Tengberg et al 2004). Permeable sediments incubations have a tendency to favour diffusive processes; replicating the advective processes that dominate the biogeochemistry of permeable sediments ex situ incubation set ups remains methodologically challenging (Fuchsman et al 2015;Glud 2008;Jahnke et al 2005;Lohse et al 1996;Rao et al 2007;Viollier et al 2003).…”

Section: Discussionmentioning

confidence: 99%

“…At the end of the incubation, the cores were opened and gently reaerated prior to microprofiling. The TOU was calculated from the slope of the oxygen concentration change over time in the overlying water, using a linear approximation of the initial (10-15%) decrease in the oxygen concentration (Glud 2008;Tengberg et al 2004). …”

Section: Incubation Experiments Amentioning

confidence: 99%

“…Berelson et al 2003;Berg et al 2007;Rovelli et al 2015). However, studies comparing ex situ incubation set ups with in situ measurements have found that the former can be representative of the benthic study site, provided they are run at in situ temperature and the overlying incubated water is well mixed Tengberg et al 2004). This is typically only valid for waters shallower than 1000 m depth, as the change in pressure and temperature is less likely to affect oxygen measurements carried out on board (Glud 2008;Rabouille et al 2003).…”

Section: Introductionmentioning

confidence: 99%

“…In addition, ex situ incubation experiments designed for cohesive sediment dynamics can be less effective in permeable sediments as they may restrict advective flow and hence affect solute transport and the distribution of these compounds within the sediment (Ehrenhauss et al 2004;Huettel and Webster 2001;Tengberg et al 2004). In core incubations, well mixed overlying water is particularly important for permeable sediments, where advective flow determines much of the benthic biogeochemistry Tengberg et al 2005).…”

Section: Introductionmentioning

confidence: 99%

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Oxygen dynamics in shelf seas sediments incorporating seasonal variability

et al. 2017

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Shelf sediments play a vital role in global biogeochemical cycling and are particularly important areas of oxygen consumption and carbon mineralisation. Total benthic oxygen uptake, the sum of diffusive and faunal mediated uptake, is a robust proxy to quantify carbon mineralisation. However, oxygen uptake rates are dynamic, due to the diagenetic processes within the sediment, and can be spatially and temporally variable. Four benthic sites in the Celtic Sea, encompassing gradients of cohesive to permeable sediments, were sampled over four cruises to capture seasonal and spatial changes in oxygen dynamics. Total oxygen uptake (TOU) rates were measured through a suite of incubation experiments and oxygen microelectrode profiles were taken across all four benthic sites to provide the oxygen penetration depth and diffusive oxygen uptake (DOU) rates. The difference between TOU and DOU allowed for quantification of the fauna mediated oxygen uptake and diffusive uptake. High resolution measurements showed clear seasonal and spatial trends, with higher oxygen uptake rates measured in cohesive sediments compared to the permeable sediment. The significant differences in oxygen dynamics between the sediment types were consistent between seasons, with increasing oxygen consumption during and after the phytoplankton bloom. Carbon mineralisation in shelf sediments is strongly influenced by sediment type and seasonality.

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Section: Discussionmentioning

confidence: 99%

Section: Incubation Experiments Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Oxygen dynamics in shelf seas sediments incorporating seasonal variability

et al. 2017

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“…Tengberg et al 2004) and produce reliable estimates for benthic carbon remineralisation (Renaud et al 2007a). During our measurements, the temperature of the experiments was slightly higher (max.…”

Section: Discussionmentioning

confidence: 99%

Spring-to-summer changes and regional variability of benthic processes in the western Canadian Arctic

et al. 2011

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Seasonal dynamics in the activity of Arctic shelf benthos have been the subject of few local studies, and the pronounced among-site variability characterizing their results makes it difficult to upscale and generalize their conclusions. In a regional study encompassing five sites at 100-595 m water depth in the southeastern Beaufort Sea, we found that total pigment concentrations in surficial sediments, used as proxies of general food supply to the benthos, rose significantly after the transition from ice-covered conditions in spring (March-June 2008) to open-water conditions in summer (June-August 2008), whereas sediment Chl a concentrations, typical markers of fresh food input, did not. Macrobenthic biomass (including agglutinated foraminifera [500 lm) varied significantly among sites (1.2-6.4 g C m -2 in spring, 1.1-12.6 g C m -2 in summer), whereas a general spring-to-summer increase was not detected. Benthic carbon remineralisation also ranged significantly among sites (11.9-33.2 mg C m -2 day -1 in spring, 11.6-44.4 mg C m -2 day -1 in summer) and did in addition exhibit a general significant increase from spring-to-summer. Multiple regression analysis suggests that in both spring and summer, sediment Chl a concentration is the prime determinant of benthic carbon remineralisation, but other factors have a significant secondary influence, such as foraminiferan biomass (negative in both seasons), water depth (in spring) and infaunal biomass (in summer). Our findings indicate the importance of the combined and dynamic effects of food supply and benthic community patterns on the carbon remineralisation of the polar shelf benthos in seasonally ice-covered seas.

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Landers

Jamieson

2016

Biological Sampling in the Deep Sea

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Intercalibration of benthic flux chambers I. Accuracy of flux measurements and influence of chamber hydrodynamics

Cited by 91 publications

References 56 publications

Oxygen dynamics in shelf seas sediments incorporating seasonal variability

Oxygen dynamics in shelf seas sediments incorporating seasonal variability

Spring-to-summer changes and regional variability of benthic processes in the western Canadian Arctic

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