In situ Absolute Calibration and Validation: A Link from Coastal to Open-Ocean Altimetry

Bonnefond, Pascal; Haines, Bruce; Watson, CS

doi:10.1007/978-3-642-12796-0_11

Cited by 40 publications

(45 citation statements)

References 52 publications

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“…The SSH bias and its stability are important elements of the altimeter system error budget (Chelton et al 2001;Bonnefond et al 2010). Knowledge of this Downloaded by [Universidad de Sevilla] at 03:10 25 November 2014 bias is essential for specialized studies that rely on accurate determination of scale, such as determination of the Earth's mean radius.…”

Section: Introductionmentioning

confidence: 98%

“…Data from the platform sea-level systems have shed new light on the performance of competing tidegauge technologies in dynamic sea-state environments Gill and Parke 1995;Parke and Gill 1995;Kubitschek et al 1995;Haines et al 2003). Measurements of vertical wet path delay from the GPS and an up-looking water vapor radiometer were valuable in detecting a small but important drift in the readings from both the TOPEX and Jason microwave radiometers (Keihm et al 2000;Haines and Bar-Sever 1998;Bonnefond et al 2010). Calibrations of altimeter significant wave height (SWH) estimates (Parke and Morris 1995) and ionosphere delay corrections Haines et al 2003) have also been performed.…”

Section: Introductionmentioning

confidence: 98%

“…Ironically, these initial estimates of the Jason-1 SSH bias nearly matched early estimates of the TOPEX SSH bias Born et al 1994;Ménard et al 1994;White et al 1994). More contemporary estimates of the Jason-1 SSH bias are roughly 40 mm smaller (e.g., Willis 2009;Bonnefond et al 2010), owing primarily to evolutions in the altimetric data products. There is no evidence linking the remaining Jason-1 SSH bias to the same algorithm error underlying the early TOPEX SSH bias.…”

Section: Introductionmentioning

confidence: 99%

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The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

Haines

Desai

Born³

2010

Marine Geodesy

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We present a 17-year calibration record of precise (Jason-class) spaceborne altimetry from a California offshore oil platform (Harvest). Our analyses indicate that the sea-surface-height (SSH) biases for all three TOPEX/Poseidon (1992)(1993)(1994)(1995)(1996)(1997)(1998)(1999)(2000)(2001)(2002)(2003)(2004)(2005) measurement systems are statistically indistinguishable from zero at the 15 mm level. In contrast, the SSH bias estimates for the newer Jason-1 mission (2001-present) and the Ocean Surface Topography Mission (2008-present) are significantly positive. In orbit for over eight years, the Jason-1 measurement system yields SSH biased by +94 ± 15 mm. Its successor, OSTM/Jason-2, produces SSH measurements biased by +178 ± 16 mm.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

Haines

Desai

Born³

2010

Marine Geodesy

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“…Standard altimeters achieve an accuracy of roughly 2-3 cm for 1-Hz averages (1 measurement every ∼7 km) (Bonnefond et al, 2011). Despite the remarkable performance, data in the coastal zone are often disregarded due to land and calm water interference in the satellite footprint (7.3 km for Envisat and 8.3 km for Jason for calm seas (Quartly, 1998)) and degraded geophysical corrections.…”

Section: Introductionmentioning

confidence: 99%

Cross-calibrating ALES Envisat and CryoSat-2 Delay–Doppler: A coastal altimetry study in the Indonesian Seas

Passaro

Dinardo

Quartly

et al. 2016

Advances in Space Research

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A regional cross-calibration between the first Delay-Doppler altimetry dataset from Cryosat-2 and a retracked Envisat dataset is here presented, in order to test the benefits of the Delay-Doppler processing and to expand the Envisat time series in the coastal ocean. The Indonesian Seas are chosen for the calibration, since the availability of altimetry data in this region is particularly beneficial due to the lack of in-situ measurements and its importance for global ocean circulation. The Envisat data in the region are retracked with the Adaptive Leading Edge Subwaveform (ALES) Retracker, which has been previously validated and applied successfully to coastal sea level research.The study demonstrates that CryoSat-2 is able to decrease the 1-Hz noise of sea level estimations by 0.3 cm within 50 km of the coast, when compared to the ALES-reprocessed Envisat dataset. It also shows that Envisat can be confidently used for detailed oceanographic research after the orbit change of October 2010. Cross-calibration at the crossover points indicates that in the region of study a sea state bias correction equal to 5% of the significant wave height is an acceptable approximation for Delay-Doppler altimetry.The analysis of the joint sea level time series reveals the geographic extent of the semiannual signal caused by Kelvin waves during the monsoon transitions, the larger amplitudes of the annual signal due to the Java Coastal Current and the impact of the strong La Niña event of 2010 on rising sea level trends.

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“…Up to now, the approach has been applied systematically for every 10-day repeat cycle for the full lifetime of the NASA/CNES (National Aeronautics and Space Administration/Centre National d'Etudes Spatiales) missions TOPEX/Poseidon and the follow-on missions Jason-1 and Jason-2 [5,6], all of them operating over the same ground tracks. On several sites at Corsica, point calibrations are not only performed for the NASA/CNES missions, but also for the European Space Agency (ESA) missions, ERS-2 (2nd Earth Remote Sensing satellite) and ENVISAT (ENVIronmental SATellite), as well as for SARAL (SAtellite for ARgos and ALtiKa) [7,8]. Instantaneous bias estimates are obtained by comparing GPS buoy sea level measurements and tide gauge recordings with altimeter observations.…”

Section: Introductionmentioning

confidence: 99%

Multi-Mission Cross-Calibration of Satellite Altimeters: Constructing a Long-Term Data Record for Global and Regional Sea Level Change Studies

Bösch¹,

Dettmering²,

Schwatke³

2014

Remote Sensing

112

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Climate studies require long data records extending the lifetime of a single remote sensing satellite mission. Precise satellite altimetry exploring global and regional evolution of the sea level has now completed a two decade data record. A consistent long-term data record has to be constructed from a sequence of different, partly overlapping altimeter systems which have to be carefully cross-calibrated. This cross-calibration is realized globally by adjusting an extremely large set of single-and dual-satellite crossover differences performed between all contemporaneous altimeter systems. The total set of crossover differences creates a highly redundant network and enables a robust estimate of radial errors with a dense and rather complete sampling for all altimeter systems analyzed. An iterative variance component estimation is applied to obtain an objective relative weighting between altimeter systems with different performance. The final time series of radial errors is taken to estimate (for each of the altimeter systems) an empirical auto-covariance function. Moreover, the radial errors capture relative range biases and indicate systematic variations in the geo-centering of altimeter satellite orbits. The procedure has the potential to estimate for all altimeter systems the geographically correlated mean errors which is not at all visible in single-satellite crossover differences but maps directly to estimates of the mean sea surface.

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In situ Absolute Calibration and Validation: A Link from Coastal to Open-Ocean Altimetry

Cited by 40 publications

References 52 publications

The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

The Harvest Experiment: Calibration of the Climate Data Record from TOPEX/Poseidon, Jason-1 and the Ocean Surface Topography Mission

Cross-calibrating ALES Envisat and CryoSat-2 Delay–Doppler: A coastal altimetry study in the Indonesian Seas

Multi-Mission Cross-Calibration of Satellite Altimeters: Constructing a Long-Term Data Record for Global and Regional Sea Level Change Studies

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