DOI: 10.1016/j.atmosenv.2017.11.042
Scopus记录号: 2-s2.0-85037649051
论文题名: What controls the atmospheric methane seasonal variability over India?
作者: Guha T ; , Tiwari Y ; K ; , Valsala V ; , Lin X ; , Ramonet M ; , Mahajan A ; , Datye A ; , Kumar K ; R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 175 起始页码: 83
结束页码: 91
语种: 英语
英文关键词: Atmospheric CH4 observations
; CH4 simulations
; Seasonal variation over India
Scopus关键词: Atmospheric chemistry
; Atmospheric thermodynamics
; Dynamics
; Storm sewers
; Upper atmosphere
; CH4 simulations
; General circulation model
; Ground-based observations
; Ground-based stations
; Indian subcontinents
; Lagrangian trajectories
; Seasonal variability
; Seasonal variation
; Fighter aircraft
; methane
; atmospheric convection
; flux measurement
; general circulation model
; ground-based measurement
; jet stream
; methane
; mixing
; monsoon
; seasonal variation
; seasonality
; upper atmosphere
; weather station
; Article
; concentration (parameters)
; India
; model
; priority journal
; seasonal variation
; Seychelles
; simulation
; Southern Hemisphere
; summer
; thermodynamics
; wind
; winter
; India
; India
; Maharashtra
; Sinhagad
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Atmospheric 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 (land) 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. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83087
Appears in Collections: 气候变化事实与影响
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作者单位: Indian Institute of Tropical Meteorology, Pune, India; Laboratoire des Sciences du Climat et de l'Environnement, Paris, France; King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
Recommended Citation:
Guha T,, Tiwari Y,K,et al. What controls the atmospheric methane seasonal variability over India?[J]. Atmospheric Environment,2018-01-01,175