Chapter 14 The Measurement Of Organic Carbon In Sea Water

MacKinnon, Michael D.

doi:10.1016/s0422-9894(08)70336-2

Cited by 12 publications

(5 citation statements)

References 95 publications

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“…They noticed that the distinction between DOC and POC is of arbitrary nature, organic carbon being present in a continuous size spectrum (e.g. MACKINNON, 1981). Thus, the increase in 'dissolved fluorescence' might simply be caused by increased amounts of very fine particles not retained by filters.…”

Section: Longitudinal Distribution Patternmentioning

confidence: 99%

The role of suspended matter in the distribution of dissolved inorganic phosphate, iron and aluminium in the Ems estuary

Beusekom

Jonge²

1994

Netherlands Journal of Aquatic Ecology

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In winter 1992/1993, a persistent local maximum in fluorescence, dissolved iron, dissolved aluminium and dissolved inorganic phosphate was found, upstream of the turbidity maximum in the freshwater zone of the Ems estuary (The Netherlands -Federal Republic Germany; western Europe). Upstream of this local maximum values ranged from 6 to 9 rel. units fluorescence, 0.9 to 2.4 pmol dm -3 iron, 0.5 to 0.7 p.mol dm -3 aluminium and 0.6 to 2.3 pmol dm -3 dissolved inorganic phosphate. Within the maximum peak values of 24 rel. units fluorescence, 5.8 pmol dm -3 iron, 1.4 #mol dm -3 aluminium and 8.3 p.mol dm -3 dissolved inorganic phosphate were observed. Downstream, fluorescence (indicator of dissolved organic carbon) showed conservative mixing with sea water, whereas dissolved iron, aluminium and dissolved inorganic phosphate did not. Dissolved aluminium and iron were quickly removed from solution to reach values of -100 nmol dm -3 aluminium and ~0.3 pmol.dm -3 Fe at salinities of approximately 7 PSU. Further seaward, iron concentrations gradually decreased to levels below 0.04 pmol dm-3. Dissolved aluminium first decreased to -20 nmol dm -3 at 29 PSU and increased again to concentrations of 30-44 nmol dm -3 at higher salinities. Dissolved inorganic phosphate, however, first decreased to upstream concentrations before reaching a secondary peak in the mid-estuarine reaches. At salinities >25 PSU dissolved inorganic phosphate mixed conservatively with sea water. It is hypothesized that adsorptiondesorption equilibria are responsible for the local maximum values of fluorescence (DOC), iron, aluminium and dissolved inorganic phosphate. The similarity between the observed curves suggests a common underlying process, possibly related to the adjustment of new equilibria between suspended matter of marine and riverine origin.

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Section: Longitudinal Distribution Patternmentioning

confidence: 99%

The role of suspended matter in the distribution of dissolved inorganic phosphate, iron and aluminium in the Ems estuary

Beusekom

Jonge²

1994

Netherlands Journal of Aquatic Ecology

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“…They are discussed in some monographs and review works, (for example : Skopintsev 1950, Datsko 1959, Duursma 1961, Koyama 1962, Menzel and Ryther 1970, Starikova 1970, Khailov 1971, Liutsarev 1973, Williams 1975, Wangersky 1978, Skopintsev et al 1979, MacKinnon 1981. They are discussed in some monographs and review works, (for example : Skopintsev 1950, Datsko 1959, Duursma 1961, Koyama 1962, Menzel and Ryther 1970, Starikova 1970, Khailov 1971, Liutsarev 1973, Williams 1975, Wangersky 1978, Skopintsev et al 1979, MacKinnon 1981.…”

Section: Carbon Of Dissolved Organic Matter In the Oceanmentioning

confidence: 99%

Geochemistry of Organic Matter in the Ocean

Romankevich¹

1984

258

122

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“…While this is a relatively small amount, it may have significant impacts on the cloud forming properties of aerosols. The composition of seawater, contains 35 g/L salts and 0.002 g/L organics (Mackinnon, 1981;Hansell and Carlson, 2014). These organics are mainly contributed by the marine dissolved organic carbon (DOC) reservoir which, at 662 Pg (Hansell et al, 2009) is the largest pool of reduced carbon in the ocean.…”

Section: Introductionmentioning

confidence: 99%

Role of Sea Surface Microlayer Properties in Cloud Formation

et al. 2021

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To date, the relative contribution of primary marine organic matter to the subset of atmospheric particles that nucleate cloud droplets is highly uncertain. Here, cloud condensation nuclei (CCN) measurements were conducted on aerosolized sea surface microlayer (SML) samples collected from the North Atlantic Ocean during the NASA North Atlantic Aerosols and Marine Ecosystems Study (NAAMES), κ values were predicted for three representative high molecular weight (HMW) organic components of marine aerosol: 6-glucose, humic acid, and ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBisCO). The predicted κ values for pure organic aerosols varied by only ±0.01 across all of the organics chosen. For the desalted SML samples, calculations assuming an organic composition of entirely RuBisCO provided the closest predicted κ values for the desalted SML samples with a mean κ value of 0.53 ± 0.10. These results indicate that it is the sea salt in the SML which drives the cloud formation potential of marine aerosols. While the presence of organic material from the ocean surface waters may increase aerosol mass due to enrichment processes, cloud formation potential of mixed organic/salt primary marine aerosols will be slightly weakened or unchanged compared to sea spray aerosol.

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Chapter 14 The Measurement Of Organic Carbon In Sea Water

Cited by 12 publications

References 95 publications

The role of suspended matter in the distribution of dissolved inorganic phosphate, iron and aluminium in the Ems estuary

The role of suspended matter in the distribution of dissolved inorganic phosphate, iron and aluminium in the Ems estuary

Geochemistry of Organic Matter in the Ocean

Role of Sea Surface Microlayer Properties in Cloud Formation

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