Uncertainty Reduction of Arctic Sea Ice Freeboard from CryoSat-2 Interferometric Mode

A. Di Bella*, H. Skourup, J. Bouffard, T. Parrinello

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Abstract A study by Armitage and Davidson (2014) has shown that the extra information from the CryoSat-2 (CS2) SARIn mode increases the number of valid sea surface height estimates which are usually discarded in the SAR mode due to snagging of the radar signal. As the number of valid detected leads increases, the uncertainty of the freeboard heights decreases. In this study, the freeboard heights estimated by processing CS2 SARIn level 1b waveforms are validated using the information from airborne laser and radar altimetry as well as snow radar measurements acquired during the CryoVEx 2012 and Operation IceBridge 2012 campaigns, respectively. The possible reduction in the random freeboard uncertainty is investigated comparing two scenarios, i.e. a SAR-like and a SARIn acquisition. A very good agreement is found between average airborne and satellite radar freeboards although, at the CS2 footprint scale, they do not show along-track spatial correlation. It is observed that using the extra phase information, CS2 is able to detect leads up to 2300 m off-nadir. A reduction in the the total random freeboard uncertainty of ∼ 40% is observed by taking advantage of the CS2 interferometric capabilities, which enable to include ∼ 35% of the waveforms discarded in the SAR-like scenario.
Original languageEnglish
JournalAdvances in space research
Volume62
Issue number6
Pages (from-to)1251-1264
ISSN0273-1177
DOIs
Publication statusPublished - 2018

Keywords

  • CryoSat-2
  • Sea ice
  • Freeboard
  • Uncertainty
  • SARIn
  • Altimetry

Cite this

@article{c361aaca51d04b5791f547883164ab77,
title = "Uncertainty Reduction of Arctic Sea Ice Freeboard from CryoSat-2 Interferometric Mode",
abstract = "Abstract A study by Armitage and Davidson (2014) has shown that the extra information from the CryoSat-2 (CS2) SARIn mode increases the number of valid sea surface height estimates which are usually discarded in the SAR mode due to snagging of the radar signal. As the number of valid detected leads increases, the uncertainty of the freeboard heights decreases. In this study, the freeboard heights estimated by processing CS2 SARIn level 1b waveforms are validated using the information from airborne laser and radar altimetry as well as snow radar measurements acquired during the CryoVEx 2012 and Operation IceBridge 2012 campaigns, respectively. The possible reduction in the random freeboard uncertainty is investigated comparing two scenarios, i.e. a SAR-like and a SARIn acquisition. A very good agreement is found between average airborne and satellite radar freeboards although, at the CS2 footprint scale, they do not show along-track spatial correlation. It is observed that using the extra phase information, CS2 is able to detect leads up to 2300 m off-nadir. A reduction in the the total random freeboard uncertainty of ∼ 40{\%} is observed by taking advantage of the CS2 interferometric capabilities, which enable to include ∼ 35{\%} of the waveforms discarded in the SAR-like scenario.",
keywords = "CryoSat-2, Sea ice, Freeboard, Uncertainty, SARIn, Altimetry",
author = "{Di Bella}, A. and H. Skourup and J. Bouffard and T. Parrinello",
year = "2018",
doi = "10.1016/j.asr.2018.03.018",
language = "English",
volume = "62",
pages = "1251--1264",
journal = "Advances in Space Research",
issn = "0273-1177",
publisher = "Pergamon Press",
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}

Uncertainty Reduction of Arctic Sea Ice Freeboard from CryoSat-2 Interferometric Mode. / Di Bella, A.; Skourup, H.; Bouffard, J.; Parrinello, T.

In: Advances in space research, Vol. 62, No. 6, 2018, p. 1251-1264.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Uncertainty Reduction of Arctic Sea Ice Freeboard from CryoSat-2 Interferometric Mode

AU - Di Bella, A.

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AU - Bouffard, J.

AU - Parrinello, T.

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N2 - Abstract A study by Armitage and Davidson (2014) has shown that the extra information from the CryoSat-2 (CS2) SARIn mode increases the number of valid sea surface height estimates which are usually discarded in the SAR mode due to snagging of the radar signal. As the number of valid detected leads increases, the uncertainty of the freeboard heights decreases. In this study, the freeboard heights estimated by processing CS2 SARIn level 1b waveforms are validated using the information from airborne laser and radar altimetry as well as snow radar measurements acquired during the CryoVEx 2012 and Operation IceBridge 2012 campaigns, respectively. The possible reduction in the random freeboard uncertainty is investigated comparing two scenarios, i.e. a SAR-like and a SARIn acquisition. A very good agreement is found between average airborne and satellite radar freeboards although, at the CS2 footprint scale, they do not show along-track spatial correlation. It is observed that using the extra phase information, CS2 is able to detect leads up to 2300 m off-nadir. A reduction in the the total random freeboard uncertainty of ∼ 40% is observed by taking advantage of the CS2 interferometric capabilities, which enable to include ∼ 35% of the waveforms discarded in the SAR-like scenario.

AB - Abstract A study by Armitage and Davidson (2014) has shown that the extra information from the CryoSat-2 (CS2) SARIn mode increases the number of valid sea surface height estimates which are usually discarded in the SAR mode due to snagging of the radar signal. As the number of valid detected leads increases, the uncertainty of the freeboard heights decreases. In this study, the freeboard heights estimated by processing CS2 SARIn level 1b waveforms are validated using the information from airborne laser and radar altimetry as well as snow radar measurements acquired during the CryoVEx 2012 and Operation IceBridge 2012 campaigns, respectively. The possible reduction in the random freeboard uncertainty is investigated comparing two scenarios, i.e. a SAR-like and a SARIn acquisition. A very good agreement is found between average airborne and satellite radar freeboards although, at the CS2 footprint scale, they do not show along-track spatial correlation. It is observed that using the extra phase information, CS2 is able to detect leads up to 2300 m off-nadir. A reduction in the the total random freeboard uncertainty of ∼ 40% is observed by taking advantage of the CS2 interferometric capabilities, which enable to include ∼ 35% of the waveforms discarded in the SAR-like scenario.

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KW - SARIn

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