@article{PAR00008801,
  title = {{D}isaggregation of {SMOS} soil moisture in {S}outheastern {A}ustralia},
  author = {{M}erlin, {O}. and {R}udiger, {C}. and {A}l {B}itar, {A}. and {R}ichaume, {P}. and {W}alker, {J}.{P}. and {K}err, {Y}ann},
  editor = {},
  language = {{ENG}},
  abstract = {{D}isaggregation based on {P}hysical {A}nd {T}heoretical scale {C}hange ({D}is{PATC}h) is an algorithm dedicated to the disaggregation of soil moisture observations using high-resolution soil temperature data. {D}is{PATC}h converts soil temperature fields into soil moisture fields given a semi-empirical soil evaporative efficiency model and a first-order {T}aylor series expansion around the field-mean soil moisture. {I}n this study, the disaggregation approach is applied to {S}oil {M}oisture and {O}cean {S}alinity ({SMOS}) satellite data over the 500 km by 100 km {A}ustralian {A}irborne {C}alibration/validation {E}xperiments for {SMOS} ({AACES}) area. {T}he 40-km resolution {SMOS} surface soil moisture pixels are disaggregated at 1-km resolution using the soil skin temperature derived from {M}oderate {R}esolution {I}maging {S}pectroradiometer ({MODIS}) data, and subsequently compared with the {AACES} intensive ground measurements aggregated at 1-km resolution. {T}he objective is to test {D}is{PATC}h under various surface and atmospheric conditions. {I}t is found that the accuracy of disaggregation products varies greatly according to season: while the correlation coefficient between disaggregated and in situ soil moisture is about 0.7 during the summer {AACES}, it is approximately zero during the winter {AACES}, consistent with a weaker coupling between evaporation and surface soil moisture in temperate than in semi-arid climate. {M}oreover, during the summer {AACES}, the correlation coefficient between disaggregated and in situ soil moisture is increased from 0.70 to 0.85, by separating the 1-km pixels where {MODIS} temperature is mainly controlled by soil evaporation, from those where {MODIS} temperature is controlled by both soil evaporation and vegetation transpiration. {I}t is also found that the 5-km resolution atmospheric correction of the official {MODIS} temperature data has a significant impact on {D}is{PATC}h output. {A}n alternative atmospheric correction at 40-km resolution increases the correlation coefficient between disaggregated and in situ soil moisture from 0.72 to 0.82 during the summer {AACES}. {R}esults indicate that {D}is{PATC}h has a strong potential in low-vegetated semi-arid areas where it can be used as a tool to evaluate {SMOS} data (by reducing the mismatch in spatial extent between {SMOS} observations and localized in situ measurements), and as a further step, to derive a 1-km resolution soil moisture product adapted for large-scale hydrological studies.},
  keywords = {{A}ustralian {A}irborne {C}alibration/validation {E}xperiments for {SMOS} ({AACES}) ; calibration/validation ; disaggregation ; {D}isaggregation based on {P}hysical ; {A}nd {T}heoretical scale {C}hange ({D}is{PATC}h) ; field campaign ; {M}oderate ; {R}esolution {I}maging {S}pectroradiometer ({MODIS}) ; {S}oil {M}oisture and {O}cean ; {S}alinity ({SMOS})},
  booktitle = {},
  journal = {{IEEE} {T}ransactions on {G}eoscience and {R}emote {S}ensing},
  volume = {50},
  numero = {5},
  pages = {1556--1571},
  ISSN = {0196-2892},
  year = {2012},
  DOI = {10.1109/tgrs.2011.2175000},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00008801},
}