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Displaying 956 - 960 of 1605palaeoenvironments of Kuk Swamp from the beginnings of agriculture in the highlands of Papua New Guinea
Pollen, phytolith and charcoal records from the archaeological wetland site of Kuk Swamp, Wahgi Valley, Papua New Guinea spanning the period from
Probabilistic uncertainty specification: Overview, elaboration techniques and their application to a mechanistic model of carbon flux
It is widely recognised that the appropriate representation for expert judgements of uncertainty is as a probability distribution for the unknown quantity of interest. However, formal elicitation of probability distributions is a non-trivial task. We provide an overview of this field, including an outline of the process of eliciting knowledge from experts in probabilistic form. We explore approaches to probabilistic uncertainty specification including direct elicitation and Bayesian analysis.
carbon budget of a winter wheat field: An eddy covariance analysis of seasonal and inter-annual variability
Arable land occupies large areas of global land surface and hence plays an important role in the terrestrial carbon cycle. Therefore agro-ecosystems show a high potential of mitigating greenhouse gas emissions while optimizing agricultural management. Hence, there is a growing interest in analyzing and understanding carbon fluxes from arable land as affected by regional environmental as well as management conditions.
Recent trends in solar exergy and net radiation at global scale
The availability during the last decades of remotely sensed images and global climatic data allow us to analyse the “Earth system” as a whole in order to develop concepts for global environmental management. This system can be considered a complex, dissipative, dynamic entity, far from thermodynamic equilibrium (Schellnhuber, 1999). Energy balance has been considered for many decades to understand the functioning of ecosystems, the biosphere or the Earth planet as a whole, but it is also possible to study our planet from a thermodynamic point of view.
Dynamics of aggregate destabilization by water in soils under long-term conservation tillage in semiarid Spain
Due to particular soil and climate conditions and inappropriate agricultural practices, Aragon (NE Spain) is a region prone to land degradation by water erosion. For this reason, the adoption of conservation tillage systems has been encouraged as an alternative to preserve soil and water in this region. However, little information concerning soils on which these techniques are applied is available.