Stable water isotope characterization of human and natural impacts on land-atmosphere exchanges in the Amazon Basin

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dc.contributor.author Mcguffie, Kendal en_US
dc.contributor.author Henderson-Sellers, Ann en_US
dc.date.accessioned 2009-06-26T04:11:08Z
dc.date.available 2009-06-26T04:11:08Z
dc.date.issued 2004 en_US
dc.identifier 2004000202 en_US
dc.identifier.citation Mcguffie Kendal and Henderson-Sellers Ann 2004, 'Stable water isotope characterization of human and natural impacts on land-atmosphere exchanges in the Amazon Basin', Amer Geophysical Union, vol. 109, no. 1, pp. 1-25. en_US
dc.identifier.issn 0148-0227 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/654
dc.description.abstract Stable water isotopes have been employed as a means of challenging, validating, and improving numerical models of the Amazon Basin since the 1980s. This paper serves as an exemplar of how characterization of human and natural impacts on surface-atmosphere water exchanges could beneficially exploit stable water isotope data and simulations. Interpretations of Amazonian isotopic data and model simulations are found to be seriously hampered by (1) poor simulation of the gross water budget (e.g., lack of surface water conservation in models); (2) considerable model differences in the fate of precipitation (i.e., between reevaporation and runoff); (3) wide ranging characterization of natural causes of water isotopic fluctuations (especially El Ni?o and La Ni?a events); (4) isotopic land-atmosphere flux sensitivity to the prescription of boundary layer atmospheric water vapor isotopic depletion; and (5) significantly different characterization by current land-surface schemes of the partition of evaporation between isotopically fractionating (from lakes and rivers) and nonfractionating (transpiration) processes. Despite these obstacles, we find features in the recent isotopic record that might be derived from circulation and land-use changes. ENSO events may cause decreased depletion in the dry season, because of reduced convective precipitation, while increases in upper basin isotope depletions in the wet season may result from relatively less nonfractionating recycling because there are fewer trees. The promise for isotopic fingerprinting of near-surface continental water cycle changes depends upon fixing shortcomings in current atmospheric and land-surface models. en_US
dc.publisher Amer Geophysical Union en_US
dc.relation.isbasedon http://dx.doi.org/10.1029/2003JD004388 en_US
dc.title Stable water isotope characterization of human and natural impacts on land-atmosphere exchanges in the Amazon Basin en_US
dc.parent Journal Of Geophysical Research-Atmospheres en_US
dc.journal.volume 109 en_US
dc.journal.number en_US
dc.journal.number 1 en_US
dc.publocation Washington, USA en_US
dc.identifier.startpage 1 en_US
dc.identifier.endpage 25 en_US
dc.cauo.name SCI.Physics and Advanced Materials en_US
dc.conference Verified OK en_US
dc.for 090900 en_US
dc.personcode 880408 en_US
dc.personcode X000119 en_US
dc.percentage 100 en_US
dc.classification.name Geomatic Engineering en_US
dc.classification.type FOR-08 en_US
dc.description.keywords stable isotopes; Amazon; models en_US


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