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dc.contributor.authorGarcia, Rolando R.es_ES
dc.contributor.authorLópez-Puertas, Manueles_ES
dc.contributor.authorFunke, Berndes_ES
dc.contributor.authorKinnison, Douglas E.es_ES
dc.contributor.authorMarsh, Daniel R.es_ES
dc.contributor.authorQian, Liyinges_ES
dc.identifier.citationJournal of Geophysical Research - Part D - Atmospheres, 121(7): 3634-3644 (2016)es_ES
dc.description.abstractAn analysis of recent observations (2004-2013) made by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) instrument indicate that total carbon (COx=CO+CO2) has been increasing rapidly in the lower thermosphere, above 10(-3)hPa (90km). The estimated trend (similar to 9% per decade) is about a factor of 2 larger than the rate of increase that can be ascribed to anthropogenic emissions of CO2 (similar to 5% per decade). Here we investigate whether the observed trends of CO2 and COx can be reproduced using the Whole Atmosphere Community Climate Model (WACCM), a comprehensive global model with interactive chemistry, wherein vertical eddy diffusion is estimated from a parameterization of gravity wave breaking that can respond to changes in the model climate. We find that the modeled trends of CO2 and COx do not differ significantly at any altitude from the value expected from anthropogenic increases of CO2 and that WACCM does not produce significant changes in eddy diffusivity. We show that the discrepancy between model and observations cannot be attributed to uncertainties associated with geophysical noise and instrumental effects, to difficulties separating a linear trend from the 11year solar signal, or to sparse sampling by ACE-FTS. Estimates of the impact of vertical diffusion on CO2 in the model indicate that a large increase in K-zz (similar to 30% per decade) would be necessary to reconcile WACCM results with observations. It might be possible to ascertain whether such a large change in vertical mixing has in fact taken place by examining the trend of water vapor in the upper mesosphere. ©2016. American Geophysical Union. All Rights Reserved.”es_ES
dc.description.sponsorshipR.R. Garcia and D.R. Marsh were supported in part by NASA grants X09AJ83G and NNX13AE33G, respectively. M. Lopez-Puertas and B. Funke were supported by MINECO (Spain) under grant ESP2014-54362-P and EC FEDER funds. WACCM is a component of NCAR's Community Earth System Model (CESM), which is supported by the National Science Foundation (NSF) and the Office of Science of the U.S. Department of Energy.es_ES
dc.publisherAmerican Geophysical Uniones_ES
dc.relation.isversionofPublisher's versiones_ES
dc.subjectCOx and CO2 trendses_ES
dc.titleOn the secular trend of COx and CO2 in the lower thermospherees_ES
dc.description.peerreviewedPeer reviewedes_ES
dc.contributor.funderNational Aeronautics and Space Administration (US)es_ES
dc.contributor.funderMinisterio de Economía y Competitividad (España)es_ES
dc.contributor.funderEuropean Commissiones_ES
dc.contributor.funderNational Science Foundation (US)es_ES
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