@article{fdi:010079690,
  title = {{D}enitrification and associated nitrous oxide and carbon dioxide emissions from the {A}mazonian wetlands},
  author = {{G}uilhen, {J}. and {A}l {B}itar, {A}. and {S}auvage, {S}. and {P}arrens, {M}. and {M}artinez, {J}ean-{M}ichel and {A}bril, {G}. and {M}oreira {T}urcq, {P}atricia and {S}anchez-{P}erez, {J}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n this paper, we quantify the {CO}2 and {N}2{O} emissions from denitrification over the {A}mazonian wetlands. {T}he study concerns the entire {A}mazonian wetland ecosystem with a specific focus on three floodplain ({FP}) locations: the {B}ranco {FP}, the {M}adeira {FP} and the {FP} alongside the {A}mazon {R}iver. {W}e adapted a simple denitrification model to the case of tropical wetlands and forced it by open water surface extent products from the {S}oil {M}oisture and {O}cean {S}alinity ({SMOS}) satellite. {A} priori model parameters were provided by in situ observations and gauging stations from the {HYBAM} {O}bservatory. {O}ur results show that the denitrification and the trace gas emissions present a strong cyclic pattern linked to the inundation processes that can be divided into three distinct phases: activation, stabilization and deactivation. {W}e quantify the average yearly denitrification and associated emissions of {CO}2 and {N}2{O} over the entire watershed at 17.8 kg{N} ha(-1) yr(-1) , 0.37 g{C}-{CO}2 {M}(-2 )yr(-1) and 0.18 g{N}-{N}2{O} {M}-2 yr(-1) respectively for the period 2011-2015. {W}hen compared to local observations, it was found that the {CO}(2)emissions accounted for 0.01 % of the integrated ecosystem, which emphasizes the fact that minor changes to the land cover may induce strong impacts on the {A}mazonian carbon budget. {O}ur results are consistent with the state of the art of global nitrogen models with a positive bias of 28 %.{W}hen compared to other wetlands in different pedoclimatic environments we found that the {A}mazonian wetlands have similar emissions of {N}2{O} with the {C}ongo tropical wetlands and lower emissions than the temperate and tropical anthropogenic wetlands of the {G}aronne ({F}rance), the {R}hine ({E}urope) and south-eastern {A}sia rice paddies. {I}n summary our paper shows that a data-model-based approach can be successfully applied to quantify {N}2{O} and {CO}(2)fluxes associated with denitrification over the {A}mazon basin. {I}n the future, the use of higher-resolution remote sensing products from sensor fusion or new sensors like the {S}urface {W}ater and {O}cean {T}opography ({SWOT}) mission will permit the transposition of the approach to other large-scale watersheds in tropical environments.},
  keywords = {{BOLIVIE} ; {COLOMBIE} ; {EQUATEUR} ; {GUYANE} {FRANCAISE} ; {PEROU} ; {SURINAME} ; {GUYANA} ; {BRESIL} ; {AMAZONE} {BASSIN}},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {17},
  numero = {16},
  pages = {4297--4311},
  ISSN = {1726-4170},
  year = {2020},
  DOI = {10.5194/bg-17-4297-2020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010079690},
}