Land sources of marine organic matter

Handa, Nobuhiko

doi:10.1016/0304-4203(77)90028-7

Cited by 21 publications

(4 citation statements)

References 77 publications

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“…Nearly all marine primary production is later metabolized in the upper water column. Eppley and Peterson (1979) The fate of freshwater organic carbon upon entering the oceans is poorly understood (Duce and Duursma, 1977;Handa, 1977). Some organic carbon is undoubtedly oxidized in the ocean, but this amount is probably small since only the most refractory compounds are likely to resist oxidation during freshwater transport.…”

Section: Discussionmentioning

confidence: 99%

“…Thus, compared to the organic matter derived from oceanic production, the organic matter from rivers may be less likely to decay upon sinking through the thermocline to lower layers. Based on studies of carbon isotope ratios in sediments, there is evidence which suggests that much of the sedimentation of terrestrial carbon occurs in estuarine and nearshore environments (Gardner and Menzel, 1974;Hedges and Parker, 1976;Shultz and Calder, 1976;Handa, 1977). These studies suggest that organic carbon in riverflow is a very small source of the carbon in deep ocean sediments.…”

Section: Discussionmentioning

confidence: 99%

“…While the initial inputs are in both dissolved and particulate form, the coarse particulate organic matter is leached and degraded to finer particles and to dissolved organic carbon (DOC) during its transit downstream (Fisher, 1977). As the degradation of organic carbon continues, much of the remaining dissolved organic carbon is refractory compounds, particularly light-colored fulvic acids (Jackson, 1975;Handa, 1977;Reuter and Perdue, 1977). There are few studies which quantify the amount of Tellus 33 (1981), 2 0040-2826/81/020172-16$02.50/0 @ 1981 Munksgaard, Copenhagen organic carbon oxidized during stream transport.…”

Section: Introductionmentioning

confidence: 99%

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Transport of organic carbon in the world's rivers

Schlesinger

Mélack²

1981

Tellus A: Dynamic Meteorology and Oceanography

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Transport of organic carbon in the world's rivers

Schlesinger

Mélack²

1981

Tellus A: Dynamic Meteorology and Oceanography

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“…(Handa et aL, 1972), N ~ (Handa, 1970;Handa et al, 1972;Tanoue and Handa, t979;Tanoue et al, 1982) :bj~c~.~ (Handa, 1977a) ;SJU'd'-~-~t~-~tZo~Nj~ ~b"d4,~ <, (Fig. The time-series sediment trap system was also using to determine the seasonal variation of the organic carbon flux.…”

mentioning

confidence: 99%

Chemical studies on organic matter and carbon cycle in the ocean

Handa

1991

Journal of the Oceanographical Society of Japan

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Chemistry of organic materials of the suspended and sinking particles, and the evaluation of the particulate materials for the carbon cycle of the ocean are described in this paper.Organic carbon (POC) and nitrogen (PON) of the suspended particles collected from various areas of the North through South Pacific were determined with considerably high variabilities in their concentration. Higher values of the POC and PON were obtained in the surface water of the higher latitudinal areas of both northern and southern hemispheres and the equatorial Pacific, while the Iower values of these organic elements were measured in the middle latitudinal areas of the Pacific. These facts clearly indicate that inorganic nutrients supply to the surface water layers from the underlying water is primarily determinative factor to govern the concentration of the POC and PON in the surface water layer. POC and PON concentrations in the intermediate through deep waters, however, are much less variable in time and space. Carbohydrates, free and combined amino acids and lipid materials were major organic constituents of the suspended particles. The organic composition of the particles was extensively variable in region, time and depth. Such change in the organic composition was mainly caused by the production and decay of the free and combined amino acids, lipid materials and water extractable carbohydrate.Sinking particle which has high sinking rate over 100m day -1 and can be collected only by sediment trap, also consists of carbohydrates, free and combined amino acids and lipid materials. A detailed analysis of the particle indicate that the sinking particle was much different from the suspended particle from the intermediate through deep waters in terms of the abundance of the biologically susceptible organic materials such as unsaturated hydrocarbon, fatty acid and water extractable carbohydrate often found in phytoplankton. These facts clearly indicate that the sinking particle plays an important role on the vertical transport of the biologically susceptible organic materials from the surface water to the deep water.

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Inputs into Microbial Food Chains

Sharp

1984

Heterotrophic Activity in the Sea

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Land sources of marine organic matter

Cited by 21 publications

References 77 publications

Transport of organic carbon in the world's rivers

Transport of organic carbon in the world's rivers

Chemical studies on organic matter and carbon cycle in the ocean

Inputs into Microbial Food Chains

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