- Title
- Improving precision of high-rate altimeter sea level anomalies by removing the sea state bias and intra-1-Hz covariant error
- Creator
- Peng, Fukai; Deng, Xiaoli
- Relation
- ARC.DP150100615 http://purl.org/au-research/grants/arc/DP150100615
- Relation
- Remote Sensing of Environment Vol. 251, Issue 15 December 2020, no. 112081
- Publisher Link
- http://dx.doi.org/10.1016/j.rse.2020.112081
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2020
- Description
- This paper assessed the precision of 20-Hz sea level anomaly (SLA) estimates with different sea state bias (SSB) corrections from reprocessed Jason-1/2/3 and Sentinel-3A data over the period of 2002–2019 within 100 km from the entire Australian coast. The altimeter waveforms were retracked by the modified Brown-peaky (MBP) retracker for Jason missions and by the SAMOSA+ retracker for Sentinel-3A. We recalculated the 20-Hz and composite SSB corrections using a regional parametric model from 20-Hz retracked estimates of the SLA, significant wave height (SWH) and wind speed. The composite SSB correction, which was recomputed after removing the retracker-dependant correlated error in 20-Hz SLA, is found to achieve better performance than other SSB corrections in the study area. Applying the 20-Hz and composite SSB corrections has reduced ~10% and ~13% of noise, respectively, in the MBP-retracked 20-Hz Jason SLA estimates, while only ~2% of noise reduction is shown by applying the 1-Hz standard SSB correction. It is also found that the improvement of retracked Sentinel-3A SLA estimates by SSB corrections is very low (~3%), indicating a dedicated SSB correction model should be developed for the SAR mode altimeter. As a result, the precision of composite SSB-corrected SLA estimates for all Jason missions can be retained at the level of 5.1 ± 1.1 cm until 3 km from the Australian coast, which is slightly lower than that of Sentinel-3A (4.2 ± 0.9 cm). The degradation within 3 km from the coast mainly corresponds to the along-track direction for MBP-retracked Jason SLA estimates, and the across-track direction for SAMOSA+ retracked Sentinel-3A SLA estimates, respectively.
- Subject
- satellite altimetry; sea level anomaly; Jason missions; sentinel-3A; data precision; Australian coastal zone; sea state bias; intra-1-Hz covariant error; SDG 3; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1436371
- Identifier
- uon:40002
- Identifier
- ISSN:0034-4257
- Rights
- © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
- Language
- eng
- Full Text
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