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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/4893

Authors: Etiope, G.*
Ciccioli, P.*
Title: Earth's Degassing: A Missing Ethane and Propane Source
Title of journal: Science
Series/Report no.: / 323 (2009)
Publisher: American Association for the Advancement of Science
Issue Date: 23-Jan-2009
DOI: 10.1126/science.1165904
Keywords: Ethane
Propane
Geologic emissions
Seepage
Abstract: Current emission inventories require an additional "unknown" source to balance the global atmospheric budgets of ethane (C2H6). Here, we provide evidence that a substantial part of the missing source can be attributed to natural gas seepage from petroliferous, geothermal, and volcanic areas. Such geologic sources also inject propane (C3H8) into the atmosphere. The analysis of a large data set of methane (CH4), ethane, and propane concentrations in surface gas emissions of 238 sites from different geographic and geologic areas, coupled with published estimates of geomethane emissions, suggests that Earth's degassing accounts for at least 17% and 10% of total ethane and propane emissions, respectively.
Description: BREVIA
Appears in Collections:03.04.05. Gases
Papers Published / Papers in press

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