Abstract
Abstract. Methane emissions have very important effect on global radiative forcing. Therefore, reducing these emissions has been proposed as an effective short-term strategy to mitigate global warming, in parallel with reductions in long-lived carbon dioxide (CO2) for long- term temperature stabilizations. In this context, Argentina emits 3645 Gg of CH4 mainly from livestock production, biomass burning and natural gas production. Since 2018, TROPOMI instruments provide global coverage on methane column-average mole fraction of dry air (XCH4), and height profiles of methane concentrations. We compare two available methane inventory: a national (a high resolution of own ellaboration: GEAA) and an international (EDGAR) emissions database with TROPOMI measurements. By performing inverse satellite retrieval we evaluate the ability of remote sensing information to detect possible hotspot methane emissions and compare these results with the two inventories. From these analyzes, we observe that the latitudinal averages of the continental sector increase at a rate of 10 ppb/degree, from south to north, while the maritime sector remains constant. From a temporary perspective, the average monthly concentration amplitude range varies 40 to 50 ppb, with minimum values in March and maximum values in September.
Highlights
Short-lived climate pollutants (SLCP) including methane (CH4), black carbon (BC), tropospheric ozone, and hydrofluorocarbons (HFCs), have very important effect on global radiative forcing (Shindell et al, 2004; Etminan et al, 2016)
We compare in this paper, two available methane inventory: a national and an international Emissions Database for Global Atmospheric Research (EDGAR) (Janssens-Maenhout et al, 2017) emissions database: EDGARv4.2FT2010; with the TROPOspheric Monitoring Instrument (TROPOMI), on board the Copernicus Sentinel-5 Precursor satellite, (TROPOMI, 2018)
2.1 National methane inventories In South America, there are national greenhouse gases (GHG) inventories submitted to the Intergovernmental Panel on Climate Change (IPCC) with a spatial resolution of provinces or districts
Summary
Short-lived climate pollutants (SLCP) including methane (CH4), black carbon (BC), tropospheric ozone, and hydrofluorocarbons (HFCs), have very important effect on global radiative forcing (Shindell et al, 2004; Etminan et al, 2016) Reducing these emissions has been proposed as an effective short-term strategy to mitigate global warming, together with reductions in long-lived carbon dioxide (CO2) for long-term temperature stabilizations. Atmospheric observations have shown significant increases in methane levels during the 20th century at a constant rate of approximately 15 ppb/year, with some stabilization in the 1990s and growing rapidly after 2006 (CDIAC, 2019) Blake, 2013; IPCC 2007, Fowler at al., 2009) The causes of these slope changes are not well known, but they do show a complex feedback of methane and biosphere. We compare in this paper, two available methane inventory: a national (high resolution of own ellaboration, here called “GEAA”) and an international Emissions Database for Global Atmospheric Research (EDGAR) (Janssens-Maenhout et al, 2017) emissions database: EDGARv4.2FT2010; with the TROPOspheric Monitoring Instrument (TROPOMI), on board the Copernicus Sentinel-5 Precursor satellite, (TROPOMI, 2018)
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