@article{fdi:010053493,
  title = {{R}elationships between phenology, radiation and precipitation in the {A}mazon region},
  author = {{B}radley, {A}. {V}. and {G}erard, {F}. {F}. and {B}arbier, {N}icolas and {W}eedon, {G}. {P}. and {A}nderson, {L}. {O}. and {H}untingford, {C}. and {A}ragao, {L}eoc and {Z}elazowski, {P}. and {A}rai, {E}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n tropical areas, {D}ynamic {G}lobal {V}egetation {M}odels ({DGVM}s) still have deficiencies in simulating the timing of vegetation phenology. {T}o start addressing this problem, standard {F}ourier-based methods are applied to aerosol screened monthly remotely sensed phenology time series ({E}nhanced {V}egetation {I}ndex, {EVI}) and two major driving factors of phenology: solar radiation and precipitation (for {M}arch 2000 through {D}ecember 2006 over northern {S}outh {A}merica). {A}t 1 x 1 km scale using, power (or variance) spectra on good quality aerosol screened time series, annual cycles in {EVI} are detected across 58.24% of the study area, the strongest (largest amplitude) occurring in the savanna. {T}erra {F}irme forest have weak but significant annual cycles in comparison with savannas because of the heterogeneity of vegetation and nonsynchronous phenological events within 1 x 1 km scale pixels. {S}ignificant annual cycles for radiation and precipitation account for 86% and 90% of the region, respectively, with different spatial patterns to phenology. {C}ross-spectral analysis was used to compare separately radiation with phenology/{EVI}, precipitation with phenology/{EVI} and radiation with precipitation. {O}verall the majority of the {T}erra {F}irme forest appears to have radiation as the driver of phenology (either radiation is in phase or leading phenology/{EVI} at the annual scale). {T}hese results are in agreement with previous research, although in {A}cre, central and eastern {P}eru and northern {B}olivia there is a coexistence of 'in phase' precipitation over {T}erra {F}irme forest. {I}n contrast in most areas of savanna precipitation appears to be a driver and savanna areas experiencing an inverse (antiphase) relationship between radiation and phenology is consistent with inhibited grassland growth due to soil moisture limitation. {T}he resulting maps provide a better spatial understanding of phenology-driver relationships offering a bench mark to parameterize ecological models.},
  keywords = {{A}mazonia ; cross-spectral analysis ; {F}ourier ; {MODIS} {EVI} ; phenology ; savanna ; seasonality ; {T}erra {F}irme forest ; time series ; vegetation ; modelling},
  booktitle = {},
  journal = {{G}lobal {C}hange {B}iology},
  volume = {17},
  numero = {6},
  pages = {2245--2260},
  ISSN = {1354-1013},
  year = {2011},
  DOI = {10.1111/j.1365-2486.2011.02405.x},
  URL = {https://www.documentation.ird.fr/hor/fdi:010053493},
}