@article{fdi:010081730,
  title = {{S}table atmospheric methane in the 2000s : key-role of emissions from natural wetlands},
  author = {{P}ison, {I}. and {R}ingeval, {B}. and {B}ousquet, {P}. and {P}rigent, {C}. and {P}apa, {F}abrice},
  editor = {},
  language = {{ENG}},
  abstract = {{T}wo atmospheric inversions (one fine-resolved and one process-discriminating) and a process-based model for land surface exchanges are brought together to analyse the variations of methane emissions from 1990 to 2009. {A} focus is put on the role of natural wetlands and on the years 2000-2006, a period of stable atmospheric concentrations. {F}rom 1990 to 2000, the top-down and bottom-up visions agree on the time-phasing of global total and wetland emission anomalies. {T}he process-discriminating inversion indicates that wetlands dominate the time-variability of methane emissions (90 % of the total variability). {T}he contribution of tropical wetlands to the anomalies is found to be large, especially during the post-{P}inatubo years (global negative anomalies with minima between -41 and -19 {T}g yr-1 in 1992) and during the alternate 1997-1998 {E}l-{N}iño/1998-1999 {L}a-{N}iña (maximal anomalies in tropical regions between +16 and +22 {T}g yr-1 for the inversions and anomalies due to tropical wetlands between +12 and +17 {T}g yr-1 for the process-based model). {B}etween 2000 and 2006, during the stagnation of methane concentrations in the atmosphere, the top-down and bottom-up approaches agree on the fact that {S}outh {A}merica is the main region contributing to anomalies in natural wetland emissions, but they disagree on the sign and magnitude of the flux trend in the {A}mazon basin. {A} negative trend (-3.9 ± 1.3 {T}g yr-1) is inferred by the process-discriminating inversion whereas a positive trend (+1.3 ± 0.3 {T}g yr-1) is found by the process model. {A}lthough processed-based models have their own caveats and may not take into account all processes, the positive trend found by the {B}-{U} approach is considered more likely because it is a robust feature of the process-based model, consistent with analysed precipitations and the satellite-derived extent of inundated areas. {O}n the contrary, the surface-data based inversions lack constraints for {S}outh {A}merica. {T}his result suggests the need for a re-interpretation of the large increase found in anthropogenic methane inventories after 2000},
  keywords = {{ZONE} {HUMIDE} ; {AMERIQUE} {DU} {SUD} ; {AMAZONIE} {BASSIN}},
  booktitle = {},
  journal = {{A}tmospheric {C}hemistry and {P}hysics},
  volume = {13},
  numero = {23},
  pages = {11609--11623},
  ISSN = {1680-7316},
  year = {2013},
  DOI = {10.5194/acp-13-11609-2013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010081730},
}