Absolute Calibration in Bass Strait, Australia: TOPEX, Jason-1 and OSTM/Jason-2

Watson, CS; White, Neil J.; Church, John A.; Burgette, Reed J.; Tregoning, Paul; Coleman, Richard

doi:10.1080/01490419.2011.584834

Cited by 73 publications

(44 citation statements)

References 21 publications

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“…In the past, this lake has already been used to determine the absolute bias of T/P, GFO, Jason-1,2, and Envisat altimeters and results were published and detailed by Cretaux et al [9][10][11]. Results have been compared to other studies performed with ocean C/V sites: Harvest platform in California [15]; Corsica site [16]; Gavdos Island [17]; and Bass Strait in Australia [18].…”

Section: Lake Issykkul C/v Site Descriptionmentioning

confidence: 99%

Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

et al. 2018

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Calibration/Validation (C/V) studies using sites in the oceans have a long history and protocols are well established. Over lakes, C/V allows addressing problems such as the performance of the various retracking algorithms and evaluating the accuracy of the geophysical corrections for continental waters. This is achievable when measurements of specific and numerous field campaigns and a ground permanent network of level gauges and weather stations are processed. C/V consists of installation of permanent sites (weather stations, limnigraphs, and GPS reference points) and the organization of regular field campaigns. The lake Issykkul serves as permanent site of C/V, for a multi-mission purpose. The objective of this paper is to calculate the altimeter biases of Jason-3 and Sentinel-3A, both belonging to an operational satellite system which is used for the long-term monitoring of lake level variations. We have also determined the accuracy of the altimeters of these two satellites, through a comparison analysis with in situ data. In 2016 and 2017, three campaigns have been organized over this lake in order to estimate the absolute bias of the nadir altimeter onboard the Jason-3 and Sentinel-3A. The fieldwork consisted of measuring water height using a GPS system, carried on a boat, along the track of the altimeter satellite across the lake. It was performed at the time of the pass of the altimeter. Absolute altimeter biases were calculated by averaging the water height differences along the pass of the satellite (GPS from the boat system versus altimetry). Jason-3 operates in a Low Resolution Mode (LRM), while the Sentinel-3A operates in Synthetic Aperture Radar (SAR) mode. In this study we found that the absolute biases measured for Jason-3 were −28 ± 40 mm with the Ocean retracker and 206 ± 30 mm with the Ice-1 retracker. The biases for Sentinel-3A were −14 ± 20 mm with the Samosa (Ocean like) retracker and 285 ± 20 mm with the OCOG (Ice-1-like) retracker. We have also evaluated the accuracy of these two altimeters over Lake Issykkul which reached to 3 cm, for both the instruments, using the Ocean retracker.

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Section: Lake Issykkul C/v Site Descriptionmentioning

confidence: 99%

Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

et al. 2018

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“…In one, a small set of heavily instrumented stations are set up under the satellite flight path, and the altimeter and in situ sea level measurements, as well as other ancillary measurements (e.g., wet tropospheric path delay), are compared. For the T/P and Jason satellites, project teams from NASA and CNES (Bonnefond et al, ; Haines et al, ; Ménard et al, ), as well as international collaborators (Mertikas et al, ; Watson et al, ) maintain a set of four such stations. In the second approach, many dozens of tide gauges from the global international network are employed (Mitchum, ).…”

Section: Introductionmentioning

confidence: 99%

On the “Cal‐Mode” Correction to TOPEX Satellite Altimetry and Its Effect on the Global Mean Sea Level Time Series

et al. 2017

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Comparison of satellite altimetry against a high‐quality network of tide gauges suggests that sea‐surface heights from the TOPEX altimeter may be biased by ±5 mm, in an approximate piecewise linear, or U‐shaped, drift. This has been previously reported in at least two other studies. The bias is probably caused by use of an internal calibration‐mode range correction, included in the TOPEX “net instrument” correction, which is suspect owing to changes in the altimeter's point target response. Removal of this correction appears to mitigate most of the drift problem. In addition, a new time series based on retracking the TOPEX waveforms, again without the calibration‐mode correction, also reduces the drift aside for a clear problem during the first 2 years. With revision, the TOPEX measurements, combined with successor Jason altimeter measurements, show global mean sea level rising fairly steadily throughout most of 24 year time period, with rates around 3 mm/yr, although higher over the last few years.

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“…Note that due to providing just only 12 experimental points, the harmonic analysis could not estimate the bias and drift of jason-2 correctly, therefore, it is not given in Table 9. At this step, we compare the results of bias estimations taken at Bushehr with those derived from other calibration sites that are located in the Corsica region of the western Mediterranean (Bonnefond et al 2003), the UK (Dong et al 2002), and the Bass Strait in Australia (Watson et al 2004(Watson et al , 2011. Table 10 shows According to this table, in the present study, the absolute altimeter biases of -21.36 mm, 113.41 mm, and 205.17 mm are estimated for Topex/Poseidon, jason-1, and jason-2, respectively.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…In order to allow a better extrapolation of the open-ocean altimetry data to onshore tide gauge data time series, the local marine geoid slope was applied to the ascending and descending ground tracks, which this resulted in improving the overall accuracy of the calibration process (Martinez-Benjamin et al 2004). Moreover, altimetry-derived sea surface heights were compared with nearby sea levels measured by the UK tide gauges around the Mediterranean Seas to estimate the absolute biases of satellite missions (Dong et al 2002), while a GPS-equipped buoy was used in Bass Strait in Australia for the same purpose (Watson et al 2004(Watson et al , 2011. GPS-based estimates were also used in determining surface heights of both Harvest tide gauge systems, while in the validation of the T/P and jason-1 datasets on Corsica in the formation flight phase allowed direct comparison of all geophysical corrections and the corrected sea-surface heights (Bonnefond et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Absolute Calibration of Satellite Altimetry Using Linear Regression and Harmonic Analysis

Jazireeyan

Ardalan

2017

Geodesy and Cartography

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The calibration of satellite radar altimetry has been extremely important for altimetry community and studying sea level changes. The main purpose of this contribution is to provide ongoing absolute calibration of altimeter bias near the Southern seas of Iran using the Iranian tide gauge network that equipped with GPS receivers to measure the sea surface heights synchronously in the same geocentric reference frame as the corresponding altimetry records. The sea level time series of coastal tide gauges have been used to estimate the bias, drift and annual/semiannual constituents of altimeter range measurements using (i) linear regression and (ii) combination of linear regression and harmonic analysis. To this end, three Iranian tide gauges located at Bushehr, Bandar Abbas and Chahbahar ports as well as Geophysical Data Records (GDR) products of Topex/Poseidon, Jason-1and Jason-2 have been considered. The numerical results have indicated that the mean absolute biases of Topex/Poseidon, Jason-1 and Jason-2 are about –26.23, 120.21 and 205.17 mm, respectively. The reliability of method has been assessed via GPS vessel at the altimeter bin nearby the Bushehr tidal stations. The presented method is viable to perfectly estimate the systematic errors, and as such, it can address the demands of high-accurate applications.

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Absolute Calibration in Bass Strait, Australia: TOPEX, Jason-1 and OSTM/Jason-2

Cited by 73 publications

References 21 publications

Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

Absolute Calibration or Validation of the Altimeters on the Sentinel-3A and the Jason-3 over Lake Issykkul (Kyrgyzstan)

On the “Cal‐Mode” Correction to TOPEX Satellite Altimetry and Its Effect on the Global Mean Sea Level Time Series

Absolute Calibration of Satellite Altimetry Using Linear Regression and Harmonic Analysis

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