Advection ecosystem

Wang W. Davis K.J. Cook B.D. Bakwin P.S. Yi C. Butler M.P. and Ricciuto D.M. (2005b). Surface layer C02 budget and advective contributions to measurements of net ecosystem-atmosphere exchange of C02. Agricultural and Forest Meteorology, 135(1 -4), 202-214. 

Galperin MV (2000) The approaches to correct computation of airborne pollution advection, vol XVll, Problems of ecological monitoring and ecosystem modelling. Gidrometeoizdat, St. Petersburg, pp 54-68... 

An important conclusion of the Toggweiler and Carson (1995) study is that the EUC is the most important source of N to the equatorial zone paradoxically, NO3 concentration in the EUC is lower than in the surrounding waters. The resolution of this apparent paradox lies in the nonconservative nature of bioactive elements such as N. The primary mass balance for N is between zonal advection by the EUC and sedimentation of particulate N, while the mass balance for water is between zonal advection and poleward advection of surface waters that have been depleted of N by the biota. This is not intended to minimize the importance of vertical advection, which is of course very important for equatorial ecosystems, but to understand sources to the region as a whole, by calculating fluxes in and out of a box encompassing the upper equatorial ocean down to the base of the thermocHne. 

There are many choices for numerical schemes for the advection of tracers. Generally, a compromise between numerical accuracy and computational effort is chosen. Especially, for ecosystem models it is important, that the advection scheme is positive definite. Positive... 

W. McKiver and Z. Neufeld. Influence of turbulent advection on a phytoplankton ecosystem with non-uniform carrying capacity. Phys. Rev. E, 79 061902, 2009. 

A.B. Rovinsky, H. Adiwidjaja, V.Z. Yakhnin, and M. Mezinger. Patchiness and enhancement of productivity in plankton ecosystems due to differential advection of predator and prey. Oikos, 78 101-106, 1997. 

To understand the bay s ecosystem and water quahty comprehensively, we must have enough understanding of biologic, chemical, and physical processes. Nutrients enter the bay from river, atmosphere, industry and wastewater treatment plants, and transferred by the effect of advection and diffusion in the bay. Nutrients are also transformed to organic matter by phytoplankton uptake or mineralized by adsorption. Even if it settles down on the seabed, it will be recycled as suspended matter by wave-induced flow or remineralized by bacteria. 

The next step is to identify the source(s) of a chemical and the nature of the release(s) of that chemical, including the amount and to what media. The story continues with a description of how the chemical moves through the environment, considering advection and transport between phases, the reactions it undergoes, and the potential to bioaccumulate. Finally, the exposure scenario describes who or what is exposed (i.e., the receptor, ecosystem, or habitat). 

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