@article{fdi:010057103,
  title = {{A} new parameterisation scheme of ground heat flux for land surface flux retrieval from remote sensing information},
  author = {{T}anguy, {M}aliko and {B}aille, {A}. and {G}onzalez-{R}eal, {M}. {M}. and {L}loyd, {C}. and {C}appelaere, {B}ernard and {K}ergoat, {L}. and {C}ohard, {J}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he objective of the study was to assess the performance of a new parameterisation scheme of ground heat flux ({G}) for retrieving surface fluxes from remote sensing data ({MODIS}-{T}erra). {F}ormulae that are based on empirical relationships relating {G} to net radiation, {R}-n ({G} = alpha {R}-n, alpha being a function of a vegetation index, {VI}) are currently used, but presented drawbacks, especially in bare or sparse vegetation areas because of the poor adequacy of {VI}-based relationships to account for changes in soil moisture. {I}n this study, we proposed to link a to the evaporative fraction, {EF}. {I}n a first step, using a non-dimensional form of the surface energy balance, we demonstrated that a is functionally related to {EF} and to the ratio gamma = {G}/{H} ({H} = sensible heat flux). {I}n a second step, we proposed an {EF}-based parameterisation of alpha, using ground fluxes data sets collected throughout the years 2005, 2006 and 2007 at four flux-tower sites in {W}est {A}frican countries ({M}ali, {B}enin, {N}iger) that differ in surface conditions and {M}onsoon influence. {T}he analysis indicated that the average site-specific values of alpha and {EF} were well described by a linear relationship of the type alpha = a {EF} + b, with a = -0.22 and b = 0.23. {I}n a third stage, we investigated whether {ET}-retrieval from remote sensing information ({MODIS}-{T}erra) using the new parameterisation of alpha perform better than the classical formulation through {VI}-based relationships. {W}e found that the retrieved values of {H} using the new parameterisation supplied the best agreement with the observed ground data and significant improvement with respect to estimates from alpha-{VI} relationships. {A}dvantages and limitations of the proposed parameterisation scheme were discussed.},
  keywords = {{R}emote sensing ; {G}round heat flux ; {S}ensible heat flux ; {E}vaporative fraction ; {V}egetation index},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {454},
  numero = {},
  pages = {113--122},
  ISSN = {0022-1694},
  year = {2012},
  DOI = {10.1016/j.jhydrol.2012.06.002},
  URL = {https://www.documentation.ird.fr/hor/fdi:010057103},
}