@article{fdi:010054247,
  title = {{A}bsolute calibration of {J}ason radar altimeters from {GPS} kinematic campaigns over {L}ake {I}ssykkul},
  author = {{C}r{\'e}taux, {J}. {F}. and {C}almant, {S}t{\'e}phane and {R}omanovski, {V}. and {P}erosanz, {F}. and {T}ashbaeva, {S}. and {B}onnefond, {P}. and {M}oreira, {D}. and {S}hum, {C}. {K}. and {N}ino, {F}ernando and {B}erge-{N}guyen, {M}. and {F}leury, {S}. and {G}egout, {P}. and {D}el {R}io, {R}. {A}. and {M}aisongrande, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}his study presents results of calibration/validation ({C}/{V}) of {J}ason-1 and {J}ason-2 satellite altimeters over {L}ake {I}ssykkul located in {K}yrgyzstan, which was chosen as a dedicated radar altimetry {C}/{V} site in 2004. {T}he objectives here are to estimate absolute altimeter biases and to quantify the altimetry instrument error budgets for lakes studies, including errors associated with the atmosphere media delay corrections of the radar signal, and with the different retracking mode used over "nonocean" surface. {T}he {C}/{V} is conducted using various equipments, for example, {GPS} local network, moving {GPS} along the satellites tracks over the {L}ake {I}ssykkul, in situ level gauges and weather stations. {T}he absolute bias obtained for {J}ason-1 and {J}ason-2 from field campaigns conducted in 2008, 2009 and 2010 are 96 +/- 40 mm and 162 +/- 42 mm, respectively. {T}he bias calculated for {J}ason-1 is in close agreement with estimates done at other dedicated {C}/{V} sites in the ocean, but the {J}ason-2 bias still differs by 1-2 cm with ocean {C}/{V} estimates. {T}he relative bias ({J}ason-2 minus {J}ason-1) deduced from measurements during the tandem mission is estimated at 81 +/- 10 mm. {T}he accuracy of {J}ason-1 and {J}ason-2 for the determination of the lake level variations as compared to the historical in situ gauges of the {L}ake {I}ssykkul is 33 and 31 mm {RMS}, respectively. {T}he bias between the two modes of retracking available on {J}ason-2 {G}eophysical {D}ata {R}ecords ({GDR}s) has been estimated over the two first years of {J}ason-2 data over the {L}ake {I}ssykkul. {W}e found an average value of 234 +/- 40 mm, which is in good agreement with results obtained in a previous study on the {E}nvisat satellite ({C}retaux et al. 2009). {L}ake level studies using {J}ason-2 or {E}nvisat must therefore take this relative bias into account if both retracked altimetry heights are used.},
  keywords = {{A}bsolute altimeter calibration ; {J}ason-1 ; {J}ason-2 ; {GPS} geophysical corrections ; {L}ake {I}ssykkul},
  booktitle = {},
  journal = {{M}arine {G}eodesy},
  volume = {34},
  numero = {3-4},
  pages = {291--318},
  ISSN = {0149-0419},
  year = {2011},
  DOI = {10.1080/01490419.2011.585110},
  URL = {https://www.documentation.ird.fr/hor/fdi:010054247},
}