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Membrane inlet mass spectrometry (M(MS) : a novel approach to the oceanic measurement of dimethylsulfide Nemcek, Nina
Abstract
A novel technique, membrane inlet mass spectrometry (MIMS), was used to measure dimethylsulfide gas (DMS) and algal dimethylsulfoniopropionate (DMSPp) concentrations in two different marine ecosystems of the NE Pacific. In oceanic waters along Line P, DMS levels had been observed to be unusually high, yet particulate DMSP levels had not been extensively measured. DMSPp concentrations during 3 consecutive spring cruises ranged from 0.2-63.2 nM (mean 21.5 nM , s.d. 15.0 nM ) in the upper 50 m of the water column, and varied significantly with depth, across stations and between study years. DMSPp generally decreased with depth and distance from the coast. DMSPp concentrations at most stations in 2003 were 2 to 3-fold higher than in subsequent years, and were significantly correlated to the biomass of dinoflagellates (r2 = 0.46) across the survey region. Although phytoplankton biomass (chlorophyll a) also declined in 2004-2005, DMSPp:chl ratios did as well, indicating a physiological or taxonomic change in the phytoplankton community. Surface DMS concentrations were measured underway along with pCO₂, O₂/Ar, temperature, salinity and chlorophyll a in productive, coastal waters off British Columbia. All parameters exhibited large ranges, (pCO₂, 200-747 ppm; DMS, <l-28.7 nM; chl a, <0.1-33.2 μg L⁻¹), highlighting the dynamic nature of the region. A tight anti-correlation between pC0₂ and O₂/Ar was observed across the region (r = 0.90), with the distributions of these gases strongly influenced by both biological (photosynthesis and respiration) and physical (upwelling) processes. In contrast, DMS levels which exhibited rapid, fine-scale fluctuations irresolvable with traditional methods, were unrelated to any single variable. A significant linear relationship although with a different scaling factor to that derived from open ocean data. Lower resolution was however observed between DMS and the chlorophyll to mixed layer depth ratio (r² = 0.83), sampling in this region can introduce errors as large as 41% o f the mean concentration for DMS, emphasizing the utility of MHVIS in dynamic areas. In conclusion, MIMS proved to be a significant advance for DMS measurement, yet improvements need to be made for it to be a viable alternative to other methods for DMSP measurements.
Item Metadata
Title |
Membrane inlet mass spectrometry (M(MS) : a novel approach to the oceanic measurement of dimethylsulfide
|
Creator | |
Publisher |
University of British Columbia
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Date Issued |
2007
|
Description |
A novel technique, membrane inlet mass spectrometry (MIMS), was used to measure
dimethylsulfide gas (DMS) and algal dimethylsulfoniopropionate (DMSPp) concentrations in
two different marine ecosystems of the NE Pacific. In oceanic waters along Line P, DMS levels
had been observed to be unusually high, yet particulate DMSP levels had not been extensively
measured. DMSPp concentrations during 3 consecutive spring cruises ranged from 0.2-63.2 nM
(mean 21.5 nM , s.d. 15.0 nM ) in the upper 50 m of the water column, and varied significantly
with depth, across stations and between study years. DMSPp generally decreased with depth and
distance from the coast. DMSPp concentrations at most stations in 2003 were 2 to 3-fold higher
than in subsequent years, and were significantly correlated to the biomass of dinoflagellates
(r2 = 0.46) across the survey region. Although phytoplankton biomass (chlorophyll a) also
declined in 2004-2005, DMSPp:chl ratios did as well, indicating a physiological or taxonomic
change in the phytoplankton community.
Surface DMS concentrations were measured underway along with pCO₂, O₂/Ar,
temperature, salinity and chlorophyll a in productive, coastal waters off British Columbia. All
parameters exhibited large ranges, (pCO₂, 200-747 ppm; DMS, <l-28.7 nM; chl a, <0.1-33.2 μg
L⁻¹), highlighting the dynamic nature of the region. A tight anti-correlation between pC0₂ and
O₂/Ar was observed across the region (r = 0.90), with the distributions of these gases strongly
influenced by both biological (photosynthesis and respiration) and physical (upwelling)
processes. In contrast, DMS levels which exhibited rapid, fine-scale fluctuations irresolvable
with traditional methods, were unrelated to any single variable. A significant linear relationship
although with a different scaling factor to that derived from open ocean data. Lower resolution
was however observed between DMS and the chlorophyll to mixed layer depth ratio (r² = 0.83), sampling in this region can introduce errors as large as 41% o f the mean concentration for DMS,
emphasizing the utility of MHVIS in dynamic areas. In conclusion, MIMS proved to be a
significant advance for DMS measurement, yet improvements need to be made for it to be a
viable alternative to other methods for DMSP measurements.
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Genre | |
Type | |
Language |
eng
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Date Available |
2011-03-08
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Provider |
Vancouver : University of British Columbia Library
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Rights |
For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.
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DOI |
10.14288/1.0053229
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URI | |
Degree | |
Program | |
Affiliation | |
Degree Grantor |
University of British Columbia
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Campus | |
Scholarly Level |
Graduate
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Aggregated Source Repository |
DSpace
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For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use.