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| Titel |
The question of the AltiKa/Ice-1 bias over rivers |
| VerfasserIn |
Joecila Santos da Silva, Stéphane Calmant, Daniel Medeiros Moreira, Taina Conchy, Frédéric Frappart, Mélanie Becker |
| Konferenz |
EGU General Assembly 2015
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103421
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| Publikation (Nr.) |
 EGU/EGU2015-2832.pdf |
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| Zusammenfassung |
| The SARAL satellite embarks AltiKa, a Ka band altimeter. SARAL is flying the same orbit as ERS-2 and ENVISAT did previously. The altimetric pulses of AltiKa are also routinely processed in the GDR with the ICE-1 algorithm, the one performing best over rivers for ENVISAT. Thus, it can be expected that the ERS-2 and ENVISAT time series of the river levels can be continued with the SARAL series, same as between the ERS-2 and ENVISAT series. However, the gap between the decommissioning of ENVISAT and the launch of SARAL prevents the estimate of the bias between the series on a case by case basis by simple comparison of the water levels at similar dates. Therefore, a mean value of the AltiKa bias has to be estimated and be applied globally. In the present study, we present and discuss the different estimates of such a bias (ICE-1 algorithm) that we obtained by comparing AltiKa series of river levels to GPS-levelled gauges and/or to Jason-2 series used to bridge the ENVISAT and SARAL series at cross-overs between the two ground tracks. The series used in this study were computed in the Congo and Amazon basins. |
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