| Abstrakt: |
Methane emissions from tropical wetlands represent ~ 20% of the total methane contributions to the atmosphere annually and have been the main driver of variation during recent years. Despite the high number of wetlands in Mexico, methane emissions from this source remain poorly quantified. To address this gap, we estimate CH4 emissions from Mexican wetlands using the output of 13 global models, providing both a constrained value and an assessment of variation of the spatial and temporal fluxes. Our analysis reveals an annual rate of 1.76 ± 2.55 g CH4 m−2 y−1 (mean ± 1SD) for the period spanning 2000 to 2017, with total annual emissions of 134.1 ± 17.2 Gg CH4 y−1 (mean ± 1SD). The spatial variation in emissions is apparently related to the country´s precipitation distribution, with lower emission rates in the arid northern regions and higher emissions in the humid southeastern area. Annual variation in emissions is not related to environmental drivers such as precipitation, temperature and evapotranspiration, although intra-annual emissions show marked seasonality controlled by precipitation. Our nationwide estimate of CH4 wetland emissions represents 12.3% of emissions from fossil fuel in Mexico. We identify key areas for future research including the need for more direct measurements of methane emissions across the country and more accurately delineating the extent of Mexican wetlands. [ABSTRACT FROM AUTHOR] |
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