@article{fdi:010067714,
  title = {{S}patiotemporal variability in carbon exchange fluxes across the {S}ahel},
  author = {{T}agesson, {T}. and {F}ensholt, {R}. and {C}appelaere, {B}ernard and {M}ougin, {E}. and {H}orion, {S}. and {K}ergoat, {L}. and {N}ieto, {H}. and {M}bow, {C}. and {E}hammer, {A}. and {D}emarty, {J}{\'e}rome and {A}rdo, {J}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}emi-arid regions play an increasingly important role as a sink within the global carbon ({C}) cycle and is the main biome driving inter-annual variability in carbon dioxide ({CO}2) uptake by terrestrial ecosystems. {T}his indicates the need for detailed studies of spatiotemporal variability in {C} cycling for semi-arid ecosystems. {W}e have synthesized data on the land-atmosphere exchange of {CO}2 measured with the eddy covariance technique from the six existing sites across the {S}ahel, one of the largest semi-arid regions in the world. {T}he overall aim of the study is to analyse and quantify the spatiotemporal variability in these fluxes and to analyse to which degree spatiotemporal variation can be explained by hydrological, climatic, edaphic and vegetation variables. {A}ll ecosystems were {C} sinks (average +/- total error 162 +/- 48 g {C} m(-2) y(-1)), but were smaller when strongly impacted by anthropogenic influences. {S}patial and inter-annual variability in the {C} flux processes indicated a strong resilience to dry conditions, and were correlated with phenological metrics. {G}ross primary productivity ({GPP}) was the most important flux process affecting the sink strength, and diurnal variability in {GPP} was regulated by incoming radiation, whereas seasonal dynamics was closely coupled with phenology, and soil water content. {D}iurnal variability in ecosystem respiration was regulated by {GPP}, whereas seasonal variability was strongly coupled to phenology and {GPP}. {A} budget for the entire {S}ahel indicated a strong {C} sink mitigating the global anthropogenic {C} emissions. {G}lobal circulation models project an increase in temperature, whereas rainfall is projected to decrease for western {S}ahel and increase for the eastern part, indicating that the {C} sink will possibly decrease and increase for the western and eastern {S}ahel, respectively.},
  keywords = {{C}arbon dioxide ; {C}limate change ; {D}ryland ; {N}et ecosystem exchange ; {P}hotosynthesis ; {R}espiration ; {SAHEL} ; {ZONE} {SEMIARIDE}},
  booktitle = {},
  journal = {{A}gricultural and {F}orest {M}eteorology},
  volume = {226},
  numero = {},
  pages = {108--118},
  ISSN = {0168-1923},
  year = {2016},
  DOI = {10.1016/j.agrformet.2016.05.013},
  URL = {https://www.documentation.ird.fr/hor/fdi:010067714},
}