Application of Methane Supply Process Unit in Mass Balance Ecosystem Model Around Cold Seepage

2008 ◽  
Author(s):  
Tetsuo Yamazaki ◽  
Daisuke Monoe ◽  
Tomoaki Oomi ◽  
Kisaburo Nakata ◽  
Tomohiko Fukushima
Keyword(s):  
Mass Balance ◽  
Water Column ◽  
Marine Sediments ◽  
Ecosystem Model ◽  
Process Unit ◽  
Geological Structures ◽  
Supply Source ◽  
Bottom Simulating Reflector ◽  
Methane Consumption ◽  
Supply Mechanism

Natural cold seepages are characterized as rapid upward transports of methane from deeper parts of geological structures to the seafloor. The original methane supply source is expected to locate below BSR (Bottom Simulating Reflector). The methane moved up to seafloor is mainly consumed by microorganisms living in anoxic marine sediments. When the methane supply is very large or rapid, remaining unconsumed methane escapes into the water column and is consumed by oxidizing bacteria. The supply mechanism of methane from the supply source to the cold seepages has not yet being clarified. In order to integrate the methane consumption processes in sediments and water column, a simple methane supply mechanism is developed.

scholarly journals Cobalt scavenging in the mesopelagic ocean and its influence on global mass balance: Synthesizing water column and sedimentary fluxes

2018 ◽  
Vol 201 ◽  
pp. 151-166 ◽  
Author(s):  
Nicholas J. Hawco ◽  
Phoebe J. Lam ◽  
Jong-Mi Lee ◽  
Daniel C. Ohnemus ◽  
Abigail E. Noble ◽  
...  
Keyword(s):  
Mass Balance ◽  
Water Column

scholarly journals HIGH RESOLUTION BIOSTRATIGRAPHY AND PALEOECOLOGY OF THE EARLY PLIOCENE SUCCESSION OF PISSOURI BASIN (CYPRUS ISLAND)

2017 ◽  
Vol 43 (2) ◽  
pp. 763
Author(s):  
M. V Triantaphyllou ◽  
A. Antonarakou ◽  
H. Drinia ◽  
M. D. Dimiza ◽  
G. Kontakiotis ◽  
...  
Keyword(s):  
High Resolution ◽  
Water Column ◽  
Marine Sediments ◽  
Planktonic Foraminifera ◽  
Calcareous Nannofossil ◽  
Early Pliocene ◽  
Warm Temperate

The Pissouri basin (Cyprus Island) corresponds to a small tectonically controlled depression elongated NNW-SSE and widening southward in the direction of the deep Mediterranean domain. In the centre of the basin, the section Pissouri South, about 100 m thick, consists of well-preserved cyclic marine sediments including laminated brownish layers alternating with grey homogeneous marls. Plankton biostratigraphy (calcareous nannofossil and planktonic foraminifera) revealed a remarkable number of biovents bracketing the Zanclean-Piacenzian boundary. In particular the Highest Occurrence (HO) of Reticulofenestra pseudoumbilicus suggests the presence of NN14/15-NN16 nannofossil biozone boundary, dated at 3.84 Ma. Additionally the defined planktonic foraminiferal MPL3-MPL4a and MPL4a-MPL4b zone boundaries point to ages between 3.81 and 3.57 Ma, in Pissouri North section. Zanclean/Piacenzian boundary (3.6 Ma) is placed at 75.8 m from the base of the section, considering Discoaster pentaradiatus top paracme (3.61 Ma) and Globorotalia crassaformis first influx (3.6 Ma) bioevents. The cyclically developed sapropelic layers around the Zanclean – Piacenzian boundary suggest a climate characterized by a period of warm temperate conditions and a highly stratified water column that occurred at times of precession minima.

Framboid Sizes

2021 ◽  
pp. 21-46
Author(s):  
David Rickard
Keyword(s):  
Water Column ◽  
Marine Sediments ◽  
Geometric Mean ◽  
Atomic Clusters ◽  
Normal Distributions ◽  
Nanoparticle Clusters ◽  
Mean Diameter ◽  
The Mean ◽  
Framboid Formation ◽  
Log Normal

Framboid size-frequency plots show log-normal distributions with a geometric mean diameter of 6.0 μ‎m and with 95% of framboids ranging between 2.9 and 12.3 μ‎m. The largest framboids may be 250 μ‎m in diameter, although spherical aggregates of framboids, known as polyframboids, may range up to 900 μ‎m in diameter. Various spherical clusters of nanoparticles have been described which are less than 0.2 μ‎m in diameter. These do not form a continuum with framboids. There is no evidence for any significant change in framboid diameters with geologic time, and the differences in mean sizes between hydrothermal and sedimentary framboids do not, at present, appear to be statistically significant. By contrast, it appears that the mean diameters of framboids from non-marine sediments are significantly larger (7.6 μ‎m) than marine framboids (5.7 μ‎m). There is some evidence that framboids formed in the water column are smaller than those formed in sediments, but the non-critical use of this possible difference as a proxy for paleoenvironmental reconstructions is not robust. So-called microframboids and nanoframboids are discrete entities which are distinct from framboids. They are nanoparticle clusters and are not produced by the same processes as those involved in framboid formation, nor do they behave in the same way. They are more akin to atomic clusters, which form similar constructs.

Novel carotenol chlorin esters in marine sediments and water column particulate matter

1999 ◽  
Vol 63 (18) ◽  
pp. 2825-2834 ◽  
Author(s):  
Ralf Goericke ◽  
Amy Shankle ◽  
Daniel J Repeta
Keyword(s):  
Particulate Matter ◽  
Water Column ◽  
Marine Sediments

scholarly journals A 1-Dimensional Ice-Pelagic-Benthic transport model (IPBM) v0.1: Coupled simulation of ice, water column, and sediment biogeochemistry

2017 ◽  
Author(s):  
Shamil Yakubov ◽  
Philip Wallhead ◽  
Elizaveta Protsenko ◽  
Evgeniy Yakushev
Keyword(s):  
Water Column ◽  
Phytoplankton Bloom ◽  
Transport Model ◽  
Coupled System ◽  
Ecosystem Model ◽  
Polar Regions ◽  
Coupled Simulation ◽  
Biogeochemical Models ◽  
Sediment Biogeochemistry ◽  
Ice Water

Abstract. Aquatic biogeochemical processes can strongly interact, especially in polar regions, with processes occurring in adjacent ice and sediment layers, yet there are few modelling tools to simulate these systems in a fully coupled manner. We developed a 1-Dimensional Ice-Pelagic-Benthic transport model (IPBM) for coupled simulation of ice, water column, and upper sediment biogeochemistry. IPBM describes the processes of diffusion and particle sinking in both ice and water, as well sedimentation and bioturbation processes in the sediments. To describe ice, pelagic, and benthic biogeochemical dynamics (reaction terms), IPBM was partly coupled to the European Regional Seas Ecosystem Model (ERSEM) and partly to the Bottom RedOx Model biogeochemistry module (BROM-biogeochemistry) using the Framework for Aquatic Biogeochemical Models (FABM). To test the coupled system, hydrophysical forcing for a site in the Kara Sea area from a Regional Oceanic Modeling System (ROMS) simulation was used. The test run showed reasonable results for all main variables. IPBM reproduces the ice algae bloom in July followed by a pelagic phytoplankton bloom in August–September, as well as seasonal variability of nutrients in the water column.

Contaminated marine sediments: Water column and interstitial toxic effects

1993 ◽  
Vol 12 (1) ◽  
pp. 127-138 ◽  
Author(s):  
Robert M. Burgess ◽  
Richard A. McKinney ◽  
Kate A. Schweitzer ◽  
Donald K. Phelps
Keyword(s):  
Water Column ◽  
Marine Sediments ◽  
Toxic Effects ◽  
Contaminated Marine Sediments
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