Assessment of Cryosat-2 and SARAL/AltiKa altimetry for measuring inland water and coastal sea level variations: A case study on Tibetan Plateau lake and Taiwan Coast

Huan Chin Kao, Chung-Yen Kuo, Kuo Hsin Tseng, C. K. Shum, Tzu Pang Tseng, Yuan Yuan Jia, Ting Yi Yang, Tarig A. Ali, Yuchan Yi, Dostdar Hussain

Research output: Contribution to journalArticle

Abstract

Satellite altimetry has been proven as an effective technology to accurately measure water level, ice elevation, and flat land surface changes since the 1990s. To overcome limitations of pulse-limited altimetry, new altimetric missions such as Cryosat-2 and Satellite with ARgos and AltiKa (SARAL/AltiKa), have been designed to have higher along-track spatial resolution to measure more accurately inland water levels for small water bodies, and coastal sea level changes. In this study, we evaluate the performance of Cryosat-2 low-resolution (LRM) and SARin modes and SARAL/AltiKa Ka-band data on two connected lakes in central Tibetan Plateau, and in the coastal region of Taiwan. Results are compared with in situ tide gauge data in Taiwan and altimetric lake level time series from the CNES Hydroweb database. Our results show that water level change trends observed by Cryosat-2 20-Hz retracked observations, the SARAL/AltiKa 40-Hz Ice-1 retracked data, and the Hydroweb measurements are consistent with the estimated water level trend of ∼0.30 m/y, during 2011–2017, and 2013–2015, for the Tibetan Migriggyangzham Co and Dorsoidong Co, respectively. For the coastal region, the performance of SARAL/AltiKa is better than that of Cryosat-2 LRM data in Taiwan. This finding demonstrates the superiority of the Ka-band over Ku-band radar altimetry.

Original languageEnglish
Pages (from-to)327-343
Number of pages17
JournalMarine Geodesy
Volume42
Issue number4
DOIs
Publication statusPublished - 2019 Jul 4

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altimetry
plateau
sea level
water level
coast
lake
radar altimetry
ice
satellite altimetry
tide gauge
lake level
sea level change
land surface
spatial resolution
CryoSat
SARAL
inland water
measuring
time series
trend

All Science Journal Classification (ASJC) codes

  • Oceanography

Cite this

Kao, Huan Chin ; Kuo, Chung-Yen ; Tseng, Kuo Hsin ; Shum, C. K. ; Tseng, Tzu Pang ; Jia, Yuan Yuan ; Yang, Ting Yi ; Ali, Tarig A. ; Yi, Yuchan ; Hussain, Dostdar. / Assessment of Cryosat-2 and SARAL/AltiKa altimetry for measuring inland water and coastal sea level variations : A case study on Tibetan Plateau lake and Taiwan Coast. In: Marine Geodesy. 2019 ; Vol. 42, No. 4. pp. 327-343.
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abstract = "Satellite altimetry has been proven as an effective technology to accurately measure water level, ice elevation, and flat land surface changes since the 1990s. To overcome limitations of pulse-limited altimetry, new altimetric missions such as Cryosat-2 and Satellite with ARgos and AltiKa (SARAL/AltiKa), have been designed to have higher along-track spatial resolution to measure more accurately inland water levels for small water bodies, and coastal sea level changes. In this study, we evaluate the performance of Cryosat-2 low-resolution (LRM) and SARin modes and SARAL/AltiKa Ka-band data on two connected lakes in central Tibetan Plateau, and in the coastal region of Taiwan. Results are compared with in situ tide gauge data in Taiwan and altimetric lake level time series from the CNES Hydroweb database. Our results show that water level change trends observed by Cryosat-2 20-Hz retracked observations, the SARAL/AltiKa 40-Hz Ice-1 retracked data, and the Hydroweb measurements are consistent with the estimated water level trend of ∼0.30 m/y, during 2011–2017, and 2013–2015, for the Tibetan Migriggyangzham Co and Dorsoidong Co, respectively. For the coastal region, the performance of SARAL/AltiKa is better than that of Cryosat-2 LRM data in Taiwan. This finding demonstrates the superiority of the Ka-band over Ku-band radar altimetry.",
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Assessment of Cryosat-2 and SARAL/AltiKa altimetry for measuring inland water and coastal sea level variations : A case study on Tibetan Plateau lake and Taiwan Coast. / Kao, Huan Chin; Kuo, Chung-Yen; Tseng, Kuo Hsin; Shum, C. K.; Tseng, Tzu Pang; Jia, Yuan Yuan; Yang, Ting Yi; Ali, Tarig A.; Yi, Yuchan; Hussain, Dostdar.

In: Marine Geodesy, Vol. 42, No. 4, 04.07.2019, p. 327-343.

Research output: Contribution to journalArticle

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