Growth Rate, Seasonal, Synoptic, Diurnal Variations and Budget of Methane in the Lower Atmosphere
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- K. PATRA Prabir
- Frontier Research Center for Global Change, JAMSTEC
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- TAKIGAWA Masayuki
- Frontier Research Center for Global Change, JAMSTEC
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- ISHIJIMA Kentaro
- Frontier Research Center for Global Change, JAMSTEC
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- CHOI Byoung-Choel
- Korea Meteorological Administration
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- CUNNOLD Derek
- EAS, Georgia Institute of Technology
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- J. DLUGOKENCKY Edward
- NOAA Earth System Research Laboratory
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- FRASER Paul
- Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research
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- J. GOMEZ-PELAEZ Angel
- Izana Atmospheric Research Center, Agencia Estatal de Meteorología
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- GOO Tae-Young
- Korea Meteorological Administration
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- KIM Jeong-Sik
- Korea Meteorological Administration
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- KRUMMEL Paul
- Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research
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- LANGENFELDS Ray
- CSIRO Marine and Atmospheric Research
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- MEINHARDT Frank
- Umweltbundesamt—Federal Environment Agency
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- MUKAI Hitoshi
- CGER, National Institute for Environmental Studies
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- O’DOHERTY Simon
- School of Chemistry, University of Bristol
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- G. PRINN Ronald
- EAPS/CGCS/JPSPGC, Massachusetts Institute of Technology
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- SIMMONDS Peter
- School of Chemistry, University of Bristol
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- STEELE Paul
- Centre for Australian Weather and Climate Research, CSIRO Marine and Atmospheric Research
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- TOHJIMA Yasunori
- CGER, National Institute for Environmental Studies
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- TSUBOI Kazuhiro
- AED/GEMD, Japan Meteorological Agency
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- UHSE Karin
- Umweltbundesamt—Federal Environment Agency
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- WEISS Ray
- Scripps Institution of Oceanography
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- WORTHY Doug
- Environment Canada
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- NAKAZAWA Takakiyo
- Frontier Research Center for Global Change, JAMSTEC CAOS, Graduate School of Studies, Tohoku University
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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. Estimated atmospheric CH4 lifetime in this setup is 8.6 years. We found a small impact (less than 0.5 ppb integrated over 1 year) of OH diurnal variation, due to temperature dependence of reaction rate coefficient, on CH4 simulation compared to the transport related variability (order of ±15 ppb at interannual timescales). Model-observation comparisons of seasonal cycles, synoptic variations and diurnal cycles are shown to be useful for validating regional flux distribution patterns and strengths. Our results, based on two emission scenarios, suggest reduced emissions from temperate and tropical Asia region (by 13, 5, 3 Tg-CH4 for India, China and Indonesia, respectively), and compensating increase (by 9, 9, 3 Tg-CH4 for Russia, United States and Canada, respectively) in the boreal Northern Hemisphere (NH) are required for improved model-observation agreement.
Journal
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- Journal of the Meteorological Society of Japan. Ser. II
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Journal of the Meteorological Society of Japan. Ser. II 87 (4), 635-663, 2009
Meteorological Society of Japan
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Keywords
Details 詳細情報について
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- CRID
- 1390001206505788160
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- NII Article ID
- 110007359634
- 130004435042
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- NII Book ID
- AA00702524
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- ISSN
- 21869057
- 00261165
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- NDL BIB ID
- 10325701
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- NDL-Digital
- CiNii Articles
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- Abstract License Flag
- Disallowed