Automated oxygen titration and salinity determination

Knapp, George P.; Stalcup, M. C.; Stanley, R. J.

doi:10.1575/1912/69

Cited by 11 publications

(8 citation statements)

References 4 publications

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“…Fifty ml glass bottles were filled to the point of overflowing, capped with no head space and stored in the dark until analysis. Oxygen concentration measurements were made by Ms Amy Nolin at the Marine Biological Laboratory (Woods Hole, MA), using a n automated Winkler titration system designed by Knapp et al (1990).…”

Section: Methodsmentioning

confidence: 99%

A comparison of the chemical characteristics of oceanic DOM and extracellular DOM produced by marine algae

Aluwihare¹,

Repeta²

1999

Mar. Ecol. Prog. Ser.

233

178

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ABSTRACT-The chemical characteristics of extracellular high molecular weight (HMW) dissolved organic matter (DOM) from 3 species of marine phytoplankton were compared to HMW D O M in seawater. Thalassiosira weissflogii, Emiliania huxleyi and Phaeocystis sp., were grown in nutnent ennched seawater that had been previously ultrafiltered to remove HMW DOM. The extracellular HMW DOM produced in these cultures was isolated by ultrafiltration and charactenzed using nuclear magnetic resonance (NMR) spectroscopy, and rnolecular level analyses. All species exude D O M nch in polysaccharides, and the exudates of T weissflogii and E. hwleyi closely resemble acyl heteropolysaccharides (APS) previously identified as rnajor constituents of naturally occurring marine HMW DOM. Degradation of the T. weissflogii exudate alters the chemical composition of the DOM, which we attribute to differences in the reactivity of specific polysacchandes. The component within the exudate that most resembles seawater DOM has a slower degradation rate relative to the total polysacchande fraction. Our study indicates that APS isolated from the surface ocean can have a direct algal source and that APS may accumulate in seawater as a result of its metabolic resistance.

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Section: Methodsmentioning

confidence: 99%

A comparison of the chemical characteristics of oceanic DOM and extracellular DOM produced by marine algae

Aluwihare¹,

Repeta²

1999

Mar. Ecol. Prog. Ser.

233

178

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“…For the identification and enumeration of phytoplankton, samples were preserved with acidic Lugol's solution (Parsons et al 1984). Cells ≥4 µm were identified to the lowest possible taxonomic rank using an inverted microscope (WILD Heerbrugg) equipped with phase contrast optics (Lund et al 1958 Carpenter 1965, and automated as described in Knapp et al 1990) and proved to be reliable and stable over time. The degree of oxygen saturation was calculated using in situ concentration and theoretical solubility based on temperature and salinity data (Weiss 1970).…”

Section: Samplingmentioning

confidence: 99%

Prevalence, structure and properties of subsurface chlorophyll maxima in Canadian Arctic waters

Martin

Tremblay²,

Gagnon³

et al. 2010

Mar. Ecol. Prog. Ser.

210

226

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Comprehensive investigations of the Canadian Arctic during late summer and early fall revealed the widespread occurrence of long-lived subsurface chlorophyll maxima (SCM) in seasonally ice-free waters. The vertical position of the SCM corresponded with the depth of the subsurface biomass maximum (SBM), at least in Baffin Bay, suggesting that SCM could be an important source of carbon for the food web. Most of these SCM were located well below the pycnocline in close association with the nitracline, implying that their vertical position was driven mainly by a shortage of inorganic nitrogen in the upper euphotic zone. The diversity of SCM configurations with respect to physical properties of the water column complicates the estimation of euphotic-zone chlorophyll and primary production from surface properties. High photosynthetic yields (F v /F m ) showed the phytoplankton to be photosynthetically competent and well acclimated to conditions of irradiance and nutrient supply near the surface and at the SCM. A well-defined primary nitrite maximum was associated with the SCM in the southwest Canadian Arctic, but not in the northeast where nitrite concentrations were highest much below the euphotic zone. This contrast is consistent with differences in vertical stratification, the light -dark cycle and, possibly, the physiological state and taxonomic composition of the phytoplankton community at the SCM. This study demonstrates that the SCM, once regarded as anecdotal due to under-sampling, are a dominant feature of the Arctic Ocean that should be considered in remote sensing studies and biogeochemical models.

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“…No problems were noted during the cruises. This technique is described further by Knapp, Stalcup, and Stanley (1990).…”

Section: Whoi Methods and Instrumentation (Sections Ar24 A20 And A22)mentioning

confidence: 99%

Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Knorr Cruises in the North Atlantic Ocean on WOCE Sections AR24 (November 2 - December 5, 1996) and A24, A20, and A22 (May 30 - September 3, 1997)

Johnson¹,

Key²,

Millero³

et al. 2003

Carbon Dioxide Information Analysis Center (CDIAC) Datasets

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Automated oxygen titration and salinity determination

Cited by 11 publications

References 4 publications

A comparison of the chemical characteristics of oceanic DOM and extracellular DOM produced by marine algae

A comparison of the chemical characteristics of oceanic DOM and extracellular DOM produced by marine algae

Prevalence, structure and properties of subsurface chlorophyll maxima in Canadian Arctic waters

Carbon Dioxide, Hydrographic, and Chemical Data Obtained During the R/V Knorr Cruises in the North Atlantic Ocean on WOCE Sections AR24 (November 2 - December 5, 1996) and A24, A20, and A22 (May 30 - September 3, 1997)

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