globalchange  > 气候变化与战略
DOI: 10.1016/j.atmosenv.2019.117206
论文题名:
Understanding atmospheric methane sub-seasonal variability over India
作者: Tiwari Y.K.; Guha T.; Valsala V.; Lopez A.S.; Cuevas C.; Fernandez R.P.; Mahajan A.S.
刊名: Atmospheric Environment
ISSN: 1352-2310
出版年: 2020
卷: 223
语种: 英语
英文关键词: Atmospheric thermodynamics ; Carbon dioxide ; Free radicals ; Greenhouse gases ; Inverse problems ; Methane ; Temperature measurement ; Tropical engineering ; Atmospheric carbon dioxide ; Atmospheric concentration ; Ground-based observations ; Intra-seasonal variabilities ; Model simulation ; Multi-Model Simulations ; Seasonal variability ; Sub-continents ; Atmospheric chemistry ; hydroxyl radical ; methane ; atmospheric chemistry ; climate modeling ; concentration (composition) ; greenhouse gas ; ground-based measurement ; methane ; monsoon ; observational method ; seasonal variation ; simulation ; spectral analysis ; atmospheric transport ; climate change ; controlled study ; correlation coefficient ; gas chromatography ; greenhouse gas ; India ; oscillation ; power spectrum ; priority journal ; seasonal variation ; surface property ; troposphere ; India ; Maharashtra ; Sinhagad
学科: Atmospheric CH4 observations ; Indian sub-continent ; Model simulations ; Sub-seasonal variability
中文摘要: Atmospheric methane (CH4) is considered to be one of the most important greenhouse gases due to its increasing atmospheric concentrations and the fact that it has a warming potential 28 times that of atmospheric carbon dioxide (CO2). Over the Indian sub-continent, fluxes and transport both contribute towards CH4 seasonal variability. Its intra-seasonal variability however is more complex as it is additionally influenced by monsoonal activity during the Asian Summer Monsoon (ASM) period. In this study, the intra-seasonal variability of atmospheric CH4 is examined using ground-based observations at two sites located in the Southern Indian Peninsula, Sinhagad (SNG) and Cape Rama (CRI); and outputs from three different model simulations. Both, the ground based observations and multi-model simulations show that the dominant spectral variability of CH4 is coherent with 20–90 day oscillations in the dynamics of the monsoon (termed hereafter as Intra-Seasonal Oscillations, ISOs). The multi-model analysis revealed that CH4 is heavily influenced by advection due to this intra-seasonal variability. The simulations also display a clear northward propagation of CH4 anomalies over India. The co-evolution of CH4, outgoing long wave radiation (to represent convection) and OH radicals (proxy to CH4 sinks) is presented. The study quantifies CH4 variability at intra-seasonal timescales and also its spatial extent. The results suggest that the effect of ISOs on CH4 needs to be considered along with the corresponding observations for future inverse modeling. © 2019 Elsevier Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/161023
Appears in Collections:气候变化与战略

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作者单位: Indian Institute of Tropical Meteorology, Pune, 411008, India; Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry, Rocasolano, CSIC, Madrid, Spain; National Research Council (CONICET), FCEN-UNCuyo, UTN-FRM, Mendoza, 5501, Argentina

Recommended Citation:
Tiwari Y.K.,Guha T.,Valsala V.,et al. Understanding atmospheric methane sub-seasonal variability over India[J]. Atmospheric Environment,2020-01-01,223
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