| Autor: |
Stell AC; School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK., Douglas PMJ; Earth and Planetary Sciences, McGill University, Montreal, Canada H3A 0E8., Rigby M; School of Chemistry, University of Bristol, Bristol BS8 1TS, UK., Ganesan AL; School of Geographical Sciences, University of Bristol, Bristol BS8 1SS, UK. |
| Jazyk: |
angličtina |
| Zdroj: |
Philosophical transactions. Series A, Mathematical, physical, and engineering sciences [Philos Trans A Math Phys Eng Sci] 2021 Nov 15; Vol. 379 (2210), pp. 20200442. Date of Electronic Publication: 2021 Sep 27. |
| DOI: |
10.1098/rsta.2020.0442 |
| Abstrakt: |
We present the first spatially resolved distribution of the [Formula: see text] signature of wetland methane emissions and assess its impact on atmospheric [Formula: see text]. The [Formula: see text] signature map is derived by relating [Formula: see text] of precipitation to measured [Formula: see text] of methane wetland emissions at a variety of wetland types and locations. This results in strong latitudinal variation in the wetland [Formula: see text] source signature. When [Formula: see text] is simulated in a global atmospheric model, little difference is found in global mean, inter-hemispheric difference and seasonal cycle if the spatially varying [Formula: see text] source signature distribution is used instead of a globally uniform value. This is because atmospheric [Formula: see text] is largely controlled by OH fractionation. However, we show that despite these small differences, using atmospheric records of [Formula: see text] to infer changes in the wetland emissions distribution requires the use of the more accurate spatially varying [Formula: see text] source signature. We find that models will only be sensitive to changes in emissions distribution if spatial information can be exploited through the spatially resolved source signatures. In addition, we also find that on a regional scale, at sites measuring excursions of [Formula: see text] from background levels, substantial differences are simulated in atmospheric [Formula: see text] if using spatially varying or uniform source signatures. This article is part of a discussion meeting issue 'Rising methane: is warming feeding warming? (part 1)'. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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