@article{PAR00012458,
  title = {{SMOS} retrieval results over forests : comparisons with independent measurements},
  author = {{R}ahmoune, {R}. and {F}errazzoli, {P}. and {S}ingh, {Y}. {K}. and {K}err, {Y}ann and {R}ichaume, {P}. and {A}l {B}itar, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his paper shows results obtained by using {SMOS} {L}evel 2 retrieval algorithm, run at prototype stage, over forests. {F}or each {SMOS} pixel, the algorithm estimates the soil moisture ({SM}) and the vegetation optical depth (tau). {A}verage tau values retrieved in 4 days of {J}uly 2011 over forest pixels are shown and compared against forest height estimated by {GLAS} {L}idar on board {ICE}sat satellite. {R}esults of the comparison show a significantly increasing trend of tau with respect to forest height. {F}or each 1-m interval of forest height estimated by {L}idar, the standard deviation of optical depth is slightly higher than 0.1. {T}he analysis is made again considering forest tau retrieved in 4 days of {F}ebruary, {M}ay, and {N}ovember 2011, and it is observed that seasonal effects over optical depth are low. {A}s an insight, it is shown that the increasing trend is still observed after subdividing world forests into {C}oniferous, {D}eciduous {B}roadleaf, and {E}vergreen {B}roadleaf. {C}omparisons with independent information about biomass are also shown at regional level for the {U}.{S}. {T}he increasing trend is still observed, but with a reduced range of values. {F}or {SM}, 14 nodes of the {SCAN}/{SNOTEL} network in the {U}.{S}. are considered. {O}ver 2 years of data, retrieved values of {SM} are compared against ground measurements. {O}btained values of correlation coefficient, rms error, and bias are reported.},
  keywords = {{F}orestry ; microwave radiometry ; vegetation ; soil},
  booktitle = {},
  journal = {{I}eee {J}ournal of {S}elected {T}opics in {A}pplied {E}arth {O}bservations and {R}emote {S}ensing},
  volume = {7},
  numero = {9},
  pages = {3858--3866},
  ISSN = {1939-1404},
  year = {2014},
  DOI = {10.1109/jstars.2014.2321027},
  URL = {https://www.documentation.ird.fr/hor/{PAR}00012458},
}