气候变化领域集成服务门户(CCPortal): Understanding atmospheric methane sub-seasonal variability over India

CCPortal

DOI	10.1016/j.atmosenv.2019.117206
	Understanding atmospheric methane sub-seasonal variability over India
	Tiwari Y.K.; Guha T.; Valsala V.; Lopez A.S.; Cuevas C.; Fernandez R.P.; Mahajan A.S.
发表日期	2020
ISSN	1352-2310
卷号	223
英文摘要	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
关键词	Atmospheric CH4 observations Indian sub-continent Model simulations Sub-seasonal variability
语种	英语
scopus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
来源期刊	ATMOSPHERIC ENVIRONMENT
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/249407
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
推荐引用方式 GB/T 7714	Tiwari Y.K.,Guha T.,Valsala V.,et al. Understanding atmospheric methane sub-seasonal variability over India[J],2020,223.
APA	Tiwari Y.K..,Guha T..,Valsala V..,Lopez A.S..,Cuevas C..,...&Mahajan A.S..(2020).Understanding atmospheric methane sub-seasonal variability over India.ATMOSPHERIC ENVIRONMENT,223.
MLA	Tiwari Y.K.,et al."Understanding atmospheric methane sub-seasonal variability over India".ATMOSPHERIC ENVIRONMENT 223(2020).