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dc.contributor.authorGuha, Tania
dc.contributor.authorTiwari, Yogesh K.
dc.contributor.authorValsala, Vinu
dc.contributor.authorLin, Xin
dc.contributor.authorRamonet, Michel
dc.contributor.authorMahajan, Anoop
dc.contributor.authorDatye, Amey
dc.contributor.authorKumar, K. Ravi
dc.date.accessioned2017-11-29T11:13:57Z
dc.date.available2017-11-29T11:13:57Z
dc.date.issued2017-11-28
dc.identifier.citationGuha T, Tiwari YK, Valsala V, Lin X, Ramonet M, et al. (2017) What controls the atmospheric methane seasonal variability over India? Atmospheric Environment. Available: http://dx.doi.org/10.1016/j.atmosenv.2017.11.042.
dc.identifier.issn1352-2310
dc.identifier.doi10.1016/j.atmosenv.2017.11.042
dc.identifier.urihttp://hdl.handle.net/10754/626251
dc.description.abstractAtmospheric CH4 observations from two ground-based stations within Indian subcontinent, namely, Sinhagad (SNG) and Cape Rama station (CRI) showed a strong seasonality with a minima (∼1800 ± 20 ppb) during southwest monsoon (SWM; i.e. June–September, JJAS) and a maxima (2000 ± 30 ppb) during northeast monsoon (NEM i.e. December–February, DJF) with a peak-to-peak seasonality close to 200 ppb. The Indian summer (winter) monsoon is characterized with strong southwesterly (northeasterly) winds of oceanic origin at the surface level and strong easterly (westerly) jet streams aloft. The monsoon dynamics has pronounced impact on CH4 variability over India and is analyzed with winds, Lagrangian trajectories, and 3-dimentional distributions of CH4 simulated by a general circulation model. The model simulations suggest a consistent annual vertical structure (mean and sub-seasonal uncertainty) of CH4 over India with a stark contrast in concentration from summer to winter at surface levels (below 750 mb) in confirmation with what is identified by the ground-based observations. During SWM (NEM) the air with comparatively lower (higher) CH4 concentrations from southern (northern) hemisphere reduces the CH4 over India by 1814 ± 26 ppb (enhances by 1950 ± 51 ppb). The contribution of local fluxes to this seasonality appears to be albeit weak as the synthesized CH4 fluxes (from EDGAR dataset) of the Indian peninsula itself show a peak in summer and a dip in winter. Similar property of CH4 is also common to nearby oceanic region (i.e. over Arabian Sea, 1765 ± 10 ppb during summer) suggesting the role of monsoon dynamics as the controlling factor. Further the mixing and convection carries the CH4 to the upper atmosphere and advect inward or outward aloft according the seasonal monsoon dynamics.
dc.description.sponsorshipThe authors would like to express thanks to CARIBIC project for providing upper troposphere methane data in Frankfurt to Chennai flight. We express our gratitude to Carl A. M. Brenninkmeijer and Armin Rauthe-Schoch from Max Planck Institute for Mainz Germany, for their helpful comments and discussion. We would like to thank Ray Langenfeld and Marcel Vanderschot from CSIRO Australia for sharing Cape Rama data. We are thankful to the Ministry of Earth Sciences Govt. of India for supporting research through Indian Institute of Tropical Meteorology Pune India.
dc.publisherElsevier BV
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S1352231017308038
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Atmospheric Environment. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Atmospheric Environment, [, , (2017-11-28)] DOI: 10.1016/j.atmosenv.2017.11.042 . © 2017. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectAtmospheric CH4 observations
dc.subjectSeasonal variation over India
dc.subjectCH4 simulations
dc.titleWhat controls the atmospheric methane seasonal variability over India?
dc.typeArticle
dc.contributor.departmentKing Abdullah University of Science and Technology, Thuwal 23955, Saudi Arabia
dc.identifier.journalAtmospheric Environment
dc.eprint.versionPost-print
dc.contributor.institutionIndian Institute of Tropical Meteorology, Pune 411008, India
dc.contributor.institutionLaboratoire des Sciences du Climat et de l’Environnement, Paris, France
kaust.personKumar, K. Ravi
refterms.dateFOA2019-11-28T00:00:00Z
dc.date.published-online2017-11-28
dc.date.published-print2018-02


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