- Title
- Quantifying the precision of retracked Jason-2 sea level data in the 0-5 km Australian coastal zone
- Creator
- Peng, Fukai; Deng, Xiaoli; Cheng, Xiao
- Relation
- Remote Sensing of Environment Vol. 263, Issue 15 September 2021, no. 112539, p. 112539-112539
- Publisher Link
- http://dx.doi.org/10.1016/j.rse.2021.112539
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2021
- Description
- This paper aims to quantify the precision of retracked Jason-2 altimeter sea level data (2008–2016) in the 0–5 km Australian coastal zone. A new retracking strategy has been developed to achieve the highest possible precision of coastal sea-level data. Coastal waveforms were classified into four groups according to the adaptability of dedicated coastal retrackers, from which each group was reprocessed using an optimal retracker. A modified Brown model was introduced to reprocess the quasi-specular waveforms over calm waters. A seamless transition of sea surface heights from different retrackers was achieved by estimating and removing the significant wave height dependent height differences. In order to generate the 20-Hz sea level anomaly (SLA) and total water level envelope (TWLE) at the coast, the regional along-track mean sea surface (MSS) with a high spatial resolution (~300 m) was estimated. Compared to the global MSS model, the use of the along-track MSS has dramatically reduced the SLA variance by 140 cm2 in the 0–15 km coastal strip. The results from the evaluation of data precision for Jason-2 ground tracks and the validation against tide gauges show that this new retracking strategy can retrieve more reliable sea level data nearshore. The precision of 20-Hz sea level data in the 0–5 km Australian coastal strip ranges typically from 5 cm to 6 cm in most coastal areas, which is only ~1 cm lower than that beyond 5 km off the coastline. However, in Northwest Australian and some coastal regions, the data precision drops to ≥7 cm due partly to the specific coastal sea states and topography. In addition, it is found that the altimeter and tide gauge TWLE time series have a high correlation (>0.8) in the 0–5 km distance band, indicating that coastal sea-level data are useful for applications such as estimation of river plumes, long-term variation of water level in lakes and rivers, and the analysis of storm surges
- Subject
- satellite altimetry; sea level anomaly; total water level envelope; jason-2; Australian coastal zone; data precision; SDG 14; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1450153
- Identifier
- uon:43847
- Identifier
- ISSN:0034-4257
- Language
- eng
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