@article{fdi:010046762,
  title = {{A} simple method to disaggregate passive microwave-based soil moisture},
  author = {{M}erlin, {O}. and {C}hehbouni, {A}bdelghani and {W}alker, {J}.{P}. and {P}anciera, {R}. and {K}err, {Y}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper develops two alternative approaches for downscaling passive microwave-derived soil moisture. {G}round and airborne data collected over the {W}alnut {G}ulch experimental watershed during the {M}onsoon'90 experiment were used to test these approaches. {T}hese data consisted of eight micrometeorological stations ({METFLUX}) and six flights of the {L}-band {P}ush {B}room {M}icrowave {R}adiometer ({PBMR}). {F}or each {PBMR} flight, the 180-m resolution {L}-band pixels covering the eight {METFLUX} sites were first aggregated to generate a 500-m 'coarse-scale' passive microwave pixel. {T}he coarse-scale-derived soil moisture was then downscaled to the 180-m resolution using two different surface soil moisture indexes ({SMI}s): 1) the evaporative fraction ({EF}), which is the ratio of the evapotranspiration to the total energy available at the surface; and 2) the actual {EF} ({AEF}), which is defined as the ratio of the actual-to-potential evapotranspiration. {I}t is well known that both {SMI}s depend on the surface soil moisture. {H}owever, they are also influenced by other factors such as vegetation cover, soil type, root-zone soil moisture, and atmospheric conditions. {I}n order to decouple the influence of soil moisture from the other factors, a land surface model was used to account for the heterogeneity of vegetation cover, soil type, and atmospheric conditions. {T}he overall accuracy in the downscaled values was evaluated to 3% (vol.) for {EF} and 2% (vol.) for {AEF} under cloud-free conditions. {T}hese results illustrate the potential use of satellite-based estimates of instantaneous evapotranspiration on clear-sky days for downscaling the coarse-resolution passive microwave soil moisture},
  keywords = {{HUMIDITE} {DU} {SOL} ; {EVAPOTRANSPIRATION} ; {SURFACE} {DU} {SOL} ; {BILAN} {ENERGETIQUE} ; {TELEDETECTION} {SPATIALE} ; {HYPERFREQUENCE} ; {MODELISATION} ; {ETUDE} {EXPERIMENTALE}},
  booktitle = {},
  journal = {{IEEE} {T}ransactions on {G}eoscience and {R}emote {S}ensing},
  volume = {46},
  numero = {3},
  pages = {786--796},
  ISSN = {0196-2892},
  year = {2008},
  DOI = {10.1109/{TGRS}.2007.914807},
  URL = {https://www.documentation.ird.fr/hor/fdi:010046762},
}