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Growth rate, seasonal, synoptic, diurnal variations and budget of methane in the lower atmosphere
Title: Growth rate, seasonal, synoptic, diurnal variations and budget of methane in the lower atmosphere
Authors: Patra, Prabir K.Takigawa, MasayukiIshijima, KentaroChoi, Byoung-ChoelCunnold, DerekDlugokencky, Edward J.Fraser, PaulGómez Peláez, Ángel Jesús ORCID RESEARCHERID SCOPUSID Autor AEMETGoo, Tae-YoungKim, Jeong-SikKrummel, Paul B.Langenfelds, Ray L.Meinhardt, FrankMukai, HitoshiO'Doherty, SimonPrinn, Ronald G.Simmonds, PeterSteele, PaulTohjima, YasunoriTsuboi, KazuhiroUhse, KarinWeiss, Ray F.Worthy, Douglas E.Nakazawa, Takakiyo
Keywords: Atmospheric general circulation model; Chemistry transport model; Methane; Model simulation
Issue Date: 2009
Publisher: Meteorological Society of Japan
Citation: Journal of the Meteorological Society of Japan. 2009, 87(4), p. 635-663
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Abstract: We have used an AGCM (atmospheric general circulation model)-based Chemistry Transport Model (ACTM) for the simulation of methane (CH4) in the height range of earth’s surface to about 90 km. The model simulations are compared with measurements at hourly, daily, monthly and interannual time scales by filtering or averaging all the timeseries appropriately. From this model-observation comparison, we conclude that the recent (1990–2006) trends in growth rate and seasonal cycle at most measurement sites can be fairly successfully modeled by using existing knowledge of CH4 flux trends and seasonality. A large part of the interannual variability (IAV) in CH4 growth rate is apparently controlled by IAV in atmospheric dynamics at the tropical sites and forest fires in the high latitude sites. The flux amplitudes are optimized with respect to the available hydroxyl radical (OH) distribution and model transport for successful reproduction of latitudinal and longitudinal distribution of observed CH4 mixing ratio at the earth’s surface.
ISSN: 0026-1165
Appears in Collections:Artículos científicos 2005-2009

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