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Learn more. A biogeochemical general circulation model which includes production and consumption processes of dissolved organic matter DOM is developed.
The semilabile and the refractory DOM are taken into account. Case studies, which change the decay time and production ratio constant, show that the horizontal distribution of DOC in the surface layer can be reproduced only when the decay time of the semilabile DOM is about half a year. The semilabile DOM exists only above a depth of m, and its vertical and horizontal transport plays an important role in the marine biogeochemical cycle in the surface layer.
Deep-ocean dissolved organic matter reactivity along the Mediterranean Sea: does size matter?
However, below that depth, only the inert refractory DOM exists, and the role of the refractory DOM in the biogeochemical cycle is not important. The vertical transport below m is due almost entirely to POM. Volume 11 , Issue 4. If you do not receive an email within 10 minutes, your email address may not be registered, and you may need to create a new Wiley Online Library account. If the address matches an existing account you will receive an email with instructions to retrieve your username. Open access.
Biogeochemistry of marine dissolved organic matter.
Global Biogeochemical Cycles Volume 11, Issue 4. Regular Section: Free Access. Yasuhiro Yamanaka Search for more papers by this author. Eiichi Tajika Search for more papers by this author. Tools Request permission Export citation Add to favorites Track citation.
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Share Give access Share full text access. We report a chromatographic method with carbon, nitrogen and absorbance detection able to record the size distribution of DOM and changes in its composition.
The repeatability, reproducibility and limit of detection 3 ppb for both carbon and nitrogen for the three detectors demonstrated the robustness of the method for a wide range of natural waters, including carbon-rich freshwaters and deep seawaters with low carbon content ppb-C to ppb-C. Deeper analysis of the SEC demonstrated that proteins and polysaccharides are partly fractionated within the column, and that terrestrial humic substances, isolated on a XAD-8 resin, can also be eluted in both fractions associated with biopolymers and low-molecular-weight neutrals.
Application of the method to the study of DOM along a macrotidal estuary that was influenced by agricultural activities revealed significant changes in its composition despite a conservative DOC distribution. A new diagram to track changes in DOM lability is proposed to complete the humic-substances diagram.
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Additional keywords: estuary, humic substances, lability diagram, organic carbon detector, SEC. Environmental problems - Chemical approaches.