Dissolved gas measurements in oceanic waters made by membrane inlet mass spectrometry

Tortell, Philippe D.

doi:10.4319/lom.2005.3.24

Cited by 159 publications

(160 citation statements)

References 37 publications

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“…After incubation, sediment and overlying water were homogenised and subsamples of the slurries were collected in 125 mL glass bottles, sealed with crimptop septa and poisoned using 0.5 mL of 50% ZnCl 2 solution. These sub-samples were stored in the dark at room-temperature until analysis by membrane inlet mass spectrometry (MIMS) (Tortell 2005). Analytical grade water (18.2 MX Millipore-MilliQ) and seawater (salinity 37) were equilibrated with air at 25°C and used as standards, given temperature and salinity dependence of O 2 solubility (Garcia and Gordon 1992).…”

Section: Incubation Experiments Bmentioning

confidence: 99%

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: Incubation Experiments Bmentioning

confidence: 99%

Oxygen dynamics in shelf seas sediments incorporating seasonal variability

et al. 2017

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“…derway measurements of salinity, temperature, and fluorescence by thermosalinograph fluorometry, pCO 2 by membrane inlet mass spectrometry (MIMS) (42), and phytoplankton cell abundances and cellular autofluorescence by a custom-built flow-through cytometer (SI Materials and Methods) (43 Hydrographical Data. In June 2008, discrete, size-fractioned chlorophyll a concentrations were determined by the in vitro fluorometry using the acidification method (45).…”

Section: Methodsmentioning

confidence: 99%

Unveiling a phytoplankton hotspot at a narrow boundary between coastal and offshore waters

Ribalet

Marchetti

Hubbard

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

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In terrestrial ecosystems, transitional areas between different plant communities (ecotones) are formed by steep environmental gradients and are commonly characterized by high species diversity and primary productivity, which in turn influences the foodweb structure of these regions. Whether comparable zones of elevated diversity and productivity characterize ecotones in the oceans remains poorly understood. Here we describe a previously hidden hotspot of phytoplankton diversity and productivity in a narrow but seasonally persistent transition zone at the intersection of iron-poor, nitrate-rich offshore waters and iron-rich, nitrate-poor coastal waters of the Northeast Pacific Ocean. Novel continuous measurements of phytoplankton cell abundance and composition identified a complex succession of blooms of five distinct size classes of phytoplankton populations within a 100-km-wide transition zone. The blooms appear to be fueled by natural iron enrichment of offshore communities as they are transported toward the coast. The observed succession of phytoplankton populations is likely driven by spatial gradients in iron availability or time since iron enrichment. Regardless of the underlying mechanism, the resulting communities have a strong impact on the regional biogeochemistry as evidenced by the low partial pressure of CO 2 and the nearly complete depletion of nutrients. Enhanced phytoplankton productivity and diversity associated with steep environmental gradients are expected wherever water masses with complementary nutrient compositions mix to create a region more favorable for phytoplankton growth. The ability to detect and track these important but poorly characterized marine ecotones is critical for understanding their impact on productivity and ecosystem structure in the oceans.ecotone | transition zone | iron | high-nitrate, low-chlorophyll | flow cytometry

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“…[8][9][10][11][12][13]), it is a rather new application in marine and limnic research. Studies by Tortell [14] of 02' DMS or N 2 concentrations in surface waters or by Hartnett and Seitzinger [15], investigating nitrogen concentrations in sediment cores, underlined the suitability of MIMS for geochemical investigations of marine and limnic environments.…”

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confidence: 99%

“…Whereas a few studies applied MIMS for analysis of CO 2 , O 2 , or DMS concentrations in marine environments, or considered relative shifts of peak intensities indicative for CH 4 concentrations [14,16,17], the calibration of an UWMS for measurement of methane concentration in coastal areas and lakes is a rather new topic. For this purpose, we applied the Inspectr200-200 (AML) underwater mass spectrometer.…”

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Application of membrane inlet mass spectrometry for online and in situ analysis of methane in aquatic environments

Schlüter

Gentz

2008

J. Am. Soc. Mass Spectrom.

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A method is presented for the online measurement of methane in aquatic environments by application of membrane inlet mass spectrometry (MIMS). For this purpose, the underwater mass spectrometer Inspectr200-200 was applied. A simple and reliable volumetric calibration technique, based on the mixing of two end member concentrations, was used for the analysis of CH 4 by MIMS. To minimize interferences caused by the high water vapor content, permeating through the membrane inlet system into the vacuum section of the mass spectrometer, a cool-trap was designed. With the application of the cool-trap, the detection limit was lowered from 100 to 16 nmol/L CH 4 . This allows for measurements of methane concentrations in surface and bottom waters of coastal areas and lakes. Furthermore, in case of membrane rupture, the cool-trap acts as a security system, avoiding total damage of the mass spectrometer by flushing it with water. The Inspectr200-200 was applied for studies of methane and carbon dioxide concentrations in coastal areas of the Baltic Sea and Lake Constance. The low detection limit and fast response time of the MIMS allowed a detailed investigation of methane concentrations in the vicinity of gas seepages. aAm Soc Mass T he analysis of methane as well as other trace gases like carbon dioxide, nitrous oxide, or dimethyl sulphide in aquatic environments is a major objective of basic and applied research. This includes investigations of the air-sea exchange of these greenhouse gases as well as of the release of methane from gassy sediments, hydrocarbon reservoirs, and pipelines, or through dissociation of gas hydrates. Although the spatial extent of such discharge sites is often rather small, ranging from a few square meters to several square kilometers, they are considered major drivers for the marine methane cycle in the present and past [1][2][3][4].The localization of such discharge sites as well as the detection and quantification of trace gases in lakes or the ocean relies essentially on water sampling (e.g., by Rosette Water Samplers, Hydro-Bios, Kiel, Germany) and subsequent chemical analysis by gas chromatography (GC) or infrared-spectrometry (IR) onboard the research vessel. Application of GC as well as IR requires the phase transfer of gases from the dissolved to the gaseous phase. For this purpose, head-space techniques, vacuum-degassing, or spray chambers are applied [5].Head-space techniques and vacuum-degassing are very suitable for analysis of discrete water samples but or N 2 0 in surface waters sampled along transects by research vessels. Nevertheless, the time required for equilibration and subsequent GC or IR analysis is about several tens of minutes to hours [7]. Hence, highresolution investigations, in time and space, of trace gases at natural gas seepages like pockmarks (morphological depressions at the seafloor) or hydrocarbon leakages during surveys by research vessels are rather difficult and time consuming.Compared with such rather long measuring times, application of membrane inlet mass...

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Dissolved gas measurements in oceanic waters made by membrane inlet mass spectrometry

Cited by 159 publications

References 37 publications

Oxygen dynamics in shelf seas sediments incorporating seasonal variability

Oxygen dynamics in shelf seas sediments incorporating seasonal variability

Unveiling a phytoplankton hotspot at a narrow boundary between coastal and offshore waters

Application of membrane inlet mass spectrometry for online and in situ analysis of methane in aquatic environments

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