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Updated evaluation of exergy and emergy driving the geobiosphere: A review and refinement of the emergy baseline

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  • Brown, Mark T.
  • Ulgiati, Sergio

Abstract

Crucial to the method of emergy synthesis are the main driving emergy flows of the geobiosphere to which all other flows are referenced. They form the baseline for the construction of tables of Unit Emergy Values (UEVs) to be used in emergy evaluations. We provide here an updated calculation of the geobiosphere emergy baseline and UEVs for tidal and geothermal flows. First, we recalculate the flows using more recent values that have resulted from satellite measurements and generally better measurement techniques. Second, we have recalculated these global flows according to their available energy content (exergy) in order to be consistent with Odum's (1996) definition of emergy. Finally, we have reinterpreted the interaction of geothermal energy with biosphere processes thus changing the relationship between geothermal energy and the emergy baseline. In this analysis we also acknowledge the significant uncertainties related to most estimates of global data. In all, these modifications to the methodology have resulted in changes in the transformities for tidal momentum and geothermal energy and a minor change in the emergy baseline from 15.8E24seJ/J to 15.2E24seJ/J. As in all fields of science basic constants and standards are not really constant but change according to new knowledge. This is especially true of earth and ecological sciences where a large uncertainty is also to be found. As a consequence, while these are the most updated values today, they may change as better understanding is gained and uncertainties are reduced.

Suggested Citation

  • Brown, Mark T. & Ulgiati, Sergio, 2010. "Updated evaluation of exergy and emergy driving the geobiosphere: A review and refinement of the emergy baseline," Ecological Modelling, Elsevier, vol. 221(20), pages 2501-2508.
    • Handle: RePEc:eee:ecomod:v:221:y:2010:i:20:p:2501-2508
    DOI: 10.1016/j.ecolmodel.2010.06.027
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    References listed on IDEAS

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    1. Valero, Alicia & Valero, Antonio & Martínez, Amaya, 2010. "Inventory of the exergy resources on earth including its mineral capital," Energy, Elsevier, vol. 35(2), pages 989-995.
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    4. Bastianoni, S. & Facchini, A. & Susani, L. & Tiezzi, E., 2007. "Emergy as a function of exergy," Energy, Elsevier, vol. 32(7), pages 1158-1162.
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