@article{fdi:010092645,
  title = {{M}ultiscale analysis of existing actual evapotranspiration products over agropastoral {S}ahel},
  author = {{E}tchanchu, {J}ordi and {D}emarty, {J}{\'e}rome and {D}ezetter, {A}lain and {F}arhani, {N}. and {T}hiam, {P}. {B}. and {A}llies, {A}. and {B}odian, {A}. and {B}oulet, {G}illes and {C}hahinian, {N}an{\'e}e and {D}iop, {L}. and {M}ainassara, {I}brahim and {N}diaye, {P}. {M}. and {O}llivier, {C}hlo{\'e} and {O}lioso, {A}. and {R}oupsard, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{U}nderstanding the spatiotemporal variability of actual evapotranspiration ({ET}) is a critical issue for better water resources management from plot to basin scale. {I}t is particularly true in the {S}ahelian region which is very vulnerable in terms of water and agricultural resources, but also very scarcely monitored. {T}his study aims to improve understanding of {ET} in {S}ahelian agrosystems by comparing twenty {ET} products and collections on two areas in {C}entral {S}enegal and {S}outh-{W}estern {N}iger: {B}reathing {E}arth {S}ystem {S}imulation ({BESS}), {D}erive {O}ptimal {L}inear {C}ombination {E}vapotranspiration ({DOLCE}) v2.1 and v3.0, {ERA}5 and {ERA}5-{L}and, {FLUXCOM}-{RS}, {G}lobal {L}and {D}ata {A}ssimilation {S}ystem ({GLDAS}) on {N}oah and {C}atchment {L}and {S}urface {M}odel ({CLSM}), {G}lobal {L}and {E}vaporation: the {A}msterdam {M}ethodology ({GLEAM}) v3.5a, v3.5b, v3.6a and v3.6b, {M}odern-{E}ra {R}etrospective analysis for {R}esearch and {A}pplications v2 ({MERRA}-2), {MODIS} {G}lobal {E}vapotranspiration products ({MOD}16/{MYD}16), {P}enman-{M}onteith {L}euning version 2 ({PML}_{V}2) v0.1 and v0.1.7, {R}eliability {E}nsemble {A}veraging ({REA}), {S}implified {S}urface {E}nergy {B}alance for operational applications ({SSEB}op) and {W}ater {P}roductivity through {O}pen access of {R}emotely sensed derived data ({W}a{POR}). {I}n order to assess the abilities and drawbacks of each product, a multi-scale analysis is first performed at local scale with different temporal aggregation levels (daily, decadal, monthly). {T}he best performing products, like {GLEAM}, {MERRA}-2 or {GLDAS}-{N}oah, have low spatial resolution (>= 0.25 degrees), but shows really good agreement with {ET} measurements ({RMSE} similar to 0.5 mm.d(-1), {R}-2 >= 0.8). {A} multi-scale spatial analysis with different spatial aggregation levels (1, 10 and 25 km) is then performed on interannual composite maps of annual and seasonal {ET}. {R}esults highlight the different spatiotemporal behaviour of all the products. {P}roducts such as {ERA}5-{L}and and {PML}_{V}2 0.1.7 stand out in this comparison as their higher resolution allows them to describe the spatial patterns of {ET} realistically and more precisely while having relatively good performances at local scale ({RMSE} similar to 0.6 mm.d(-1), {R}-2 >= 0.7). {O}verall, the comparison highlights the need to consider soil moisture to accurately estimate {ET} in the {S}ahelian region, as the products considering it generally show better performances. {I}t also points out the lack of a high quality and resolution {ET} product over the {S}ahel. {F}uture satellite missions, as well as data fusion techniques, could help to fill up this gap and propose a reference product on {S}ahelian ecosystems.},
  keywords = {{E}vapotranspiration ; {W}est {A}frica ; {R}emote sensing ; {L}and surface models ; {I}ntercomparison ; {AFRIQUE} {DE} {L}'{OUEST} ; {ZONE} {SAHELIENNE}},
  booktitle = {},
  journal = {{J}ournal of {H}ydrology},
  volume = {651},
  numero = {},
  pages = {132585 [23 p.]},
  ISSN = {0022-1694},
  year = {2025},
  DOI = {10.1016/j.jhydrol.2024.132585},
  URL = {https://www.documentation.ird.fr/hor/fdi:010092645},
}