OSTM/Jason-2: Assessment of the System Performances (Ocean Surface Topography Mission: OSTM)

Zaouche, Gérard; Perbos, J.; Lafon, Thierry; Couderc, Veronique; Lambin, J.; Desjonqueres, J. D.; Jayles, C.; Jurado, Eric; Vaze, Parag; Fu, Lee‐Lueng; Brown, Shannon; Parisot, F.; Bonekamp, Hans; Bannoura, Walid; Lillibridge, John

doi:10.1080/01490419.2010.488978

Cited by 12 publications

(4 citation statements)

References 10 publications

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“…Cross calibration of Jason-1 to T/P and OSTM/Jason-2 to Jason-1 has been greatly assisted through the use of an initial "formation flight" phase, with the pair of altimeters sampling essentially the same ocean and atmospheric conditions from an orbit separated by approximately 70 seconds and 55 seconds, respectively (Ménard et al 2003;Lambin et al 2010). Outside the formation flight period (approximately 7 months), calibration activities remain equally important to detect anomalous biases and drifts in the various system components (notably in, e.g., the radiometer (Zaouche et al 2010)).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2011

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This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden.The publisher does not give any warranty express or implied or make any representation that the contents will be complete or accurate or up to date. The accuracy of any instructions, formulae, and drug doses should be independently verified with primary sources. The publisher shall not be liable for any loss, actions, claims, proceedings, demand, or costs or damages whatsoever or howsoever caused arising directly or indirectly in connection with or arising out of the use of this material.

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Section: Introductionmentioning

confidence: 99%

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

et al. 2011

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“…Some of the satellite tracks may not be recorded due to such reasons as problems in the ground receiving stations or abnormal data transmissions (Zaouche et al, 2010) (especially during the processes of satellite mission mode adjustments). Figure 2A shows the lost passes for the HY-2B and Jason-3 missions.…”

Section: Missing and Edited Measurementsmentioning

confidence: 99%

Cross-Calibrations of the HY-2B Altimeter Using Jason-3 Satellite During the Period of April 2019–September 2020

Wang

Yang

et al. 2021

Front. Earth Sci.

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In 2018, the Haiyang-2B (HY-2B) satellite altimeter was sent to orbit as a follow-up mission of the HY-2A satellite altimeter. The performance of the HY-2B system over the global oceans is considered to be critical. However, its performance is not fully known at the present time. In the present study, the first global quality assessment of the HY-2B Geophysical Data Record (GDR) was presented using comparison and crossover analysis processes of the main parameters and sea level anomalies (SLAs) with Jason-3 GDR data. This study’s assessment results demonstrated that the editing proportion of unqualified data for the HY-2B was 2.67%, which was at a similar level as the Jason-3 (2.86%). In addition, this study’s assessment results of the HY-2B key parameters (mainly the backscatter coefficients, significant wave heights, sea state bias, wet troposphere delays, and ionosphere delays) showed good agreement with the Jason-3, and there were no abnormal trends observed. The mean and standard deviations (STDs) were determined to be (0.21 ± 6.70) cm and (−3.4 ± 6.25) cm for the SLA differences at the self-crossover points of the HY-2B and dual-crossover points between the HY-2B and Jason-3 satellites, respectively. In addition, the SLA crossover analysis results indicated that the accuracy of the sea surface heights for the HY-2B was close to that of the Jason-3 satellite. The spatial distributions of the SLA differences showed no significant errors in the geographic characteristics. The SLA measurements were assessed using a wavenumber spectra method. The obtained results suggested that the power spectrum of the SLAs of the HY-2B satellite followed the regular patterns of the traditional Jason-3 altimeter. Furthermore, based on the spectrum analysis results, it was revealed that the noise level of the HY-2B was lower than that of the Jason-3, indicating a good overall performance of the HY-2B.

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“…The AMR on Jason 2 (Zaouche et al 2010) has three channels at 18.0, 23.8, and 34.0 GHz to estimate surface wind speed, water vapor, and cloud liquid water due to their sensitivities to each of the geophysical parameters. For the TOPEX/Jason microwave radiometers, the calibration system design is more challenging because it is a fixed nadir view only instrument with no moving part, which makes it difficult to view blackbody and space targets.…”

Section: Amsu and Amr Calibration Algorithm Comparisonsmentioning

confidence: 99%

Monitoring the Jason-2/AMR Stability Using SNO Observations from AMSU on MetOp-A

2011

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The microwave radiometers aboard the Jason satellites for altimetry missions are a key component of the Jason system, providing important measurements for water vapor correction, which is the most variable path delay correction in the altimeter measurement system. Unfortunately, these radiometers have exhibited on-orbit calibration drifts, step jumps, and other types of irregularities that can result in height rate errors comparable to 1 mm/yr, the stability requirement for measuring global mean sea level rise. Therefore, the calibration accuracy and short-and long-term stability of these radiometers are critical for the Jason mission to meet the stringent requirements. This study investigates the stability of the Jason-2 Advanced Microwave Radiometer (AMR) relative to the Advanced Microwave Sounding Unit (AMSU) on the MetOp-A satellite using the Simultaneous Nadir Overpass (SNO) time series method. Preliminary results show that using the AMSU as a stable reference, which has a demonstrated stability of better than 0.5 K per decade in previous studies, the Jason radiometer stability can be reliably monitored at 0.1 K per year level. The method has successfully detected a downward trend in the 23.8 GHz AMR channel (the primary one for detecting atmospheric water vapor) relative to the same AMSU channel for about −0.48 K per year since its launch on June 20, 2008, until February 2010, which is likely caused by AMR calibration problems during the period.

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OSTM/Jason-2: Assessment of the System Performances (Ocean Surface Topography Mission: OSTM)

Cited by 12 publications

References 10 publications

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

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

Cross-Calibrations of the HY-2B Altimeter Using Jason-3 Satellite During the Period of April 2019–September 2020

Monitoring the Jason-2/AMR Stability Using SNO Observations from AMSU on MetOp-A

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