4 resultados para a. carbon nanotubes and nanofibres

em Aquatic Commons


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EXTRACT (SEE PDF FOR FULL ABSTRACT): The horizontal and vertical distribution of three dissolved trace gases, namely molecular hydrogen, carbon monoxide, and methane, was measured in coastal and oceanic areas. Atmospheric concentrations of these gases were measured both at locations influenced by nearby human activity, and in areas far removed from these inputs.

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This paper is an attempt to provide a summary review of conclusions from previous studies on this subject. They have been organized under the following subject headings: Conceptualization of the greenhouse effect; The climatic effect of doubled carbon dioxide; Interpretation of the climatic record; Diagnosis of apparent and possible model deficiencies; The paleoclimatic record.

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EXTRACT (SEE PDF FOR FULL ABSTRACT): Measurements of spatial and temporal distributions of carbon dioxide concentration and carbon-13/carbon-12 ratio in the atmosphere suggest a strong biospheric carbon sink in terrestrial ecosystems. Quantifying the sink, however, has become an enormous challenge for Earth system scientists because of great uncertainties associated with biological variation and environmental heterogeneity in the ecosystems. This paper presents an approach that uses two driving parameters to bound terrestrial carbon sequestration associated with an increase in carbon dioxide concentration.