Ocean in the Earth System by Patrick Prouzet, André Monaco

By Patrick Prouzet, André Monaco

Complexity is an intrinsic estate of usual platforms. within the oceanic method, it truly is associated with many interactions with the ambience, geosphere and biosphere with which it exchanges strength and matter.

Complexity of the sea approach has, at diversified spatial and temporal scales, hydrodynamic mechanisms of those exchanges and dynamics of components and compounds, they're considering biogeochemical cycles or used as tracers.

By its pedagogical strategy, it defines the phrases, tools, recommendations and analytical instruments used. Then, it analyzes the implications of weather swap, destiny projections, human influence and the concept that brought with planktonic pelagic atmosphere component

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Extra resources for Ocean in the Earth System

Example text

4 has just described the regulation of the greenhouse effect, essentially through the regulation of the atmospheric level of CO2 by the equilibriums of inorganic carbon dissolved in the ocean. 3. CO2 itself is thus regulated through this process. This regulation has no direct impact on the biological productivity of the ocean since, as we will see, it is above all limited by nutritive The Ocean in the Earth System: Evolution and Regulation 37 elements other than carbon. An indirect impact could be that of variations in the acidity of the ocean, which make the development of certain species of primary producers (phytoplankton) of calcium tests more difficult.

On the other hand, the ocean can exchange carbon with the sediments through the precipitation of calcites (carbonates of calcium, CaCO3) from dissolved CO32– or, conversely, through them being dissolved. The exchanges of inorganic carbon between the ocean and atmosphere (exchanges of CO2 between its dissolved form in the surface ocean and its gas form in the atmosphere) and between the ocean and the sediment (precipitation or dissolving of CaCO3) depend largely on chemical equilibriums which tend to establish themselves between the different forms of inorganic carbon dissolved in the ocean.

5 billion years ago (the age of the most ancient known bacterial fossils, in the form of stromatolites)? The presence of a sufficiently developed ocean at different latitudes and in different climates is an element of enquiry that concerns the crucial phase of development of the first ecosystems. For life to have been able to “survive” hazards of all types in the long-term, it is necessary that its random destruction was only partial and rapidly compensated by a new colonization of the destroyed environments.

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