Improving CryoSat-2 SARIn L1b Products to Account for Inaccurate Phase Difference: Impact on Sea Ice Freeboard Retrieval

Alessandro Di Bella, Michele Scagliola, Luca Maestri, Henriette Skourup, René Forsberg

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

CryoSat-2 (CS2) is the first mission carrying on board an altimeter instrument able to operate in Synthetic Aperture Radar Interferometric (SARIn) mode. CS2 SARIn acquisitions have been exploited for different scientific applications that take advantage of the capability to determine the across-track angle of the first return and, in particular, they have been proved to reduce the uncertainty of sea ice freeboard retrievals. Nonetheless, the analysis of pan-Arctic freeboard obtained by processing CS2 Baseline C L1b products has shown large negative freeboard estimates in correspondence of the beginning of SARIn acquisitions. Throughout this letter, the SARIn waveforms are analyzed to identify the cause of this behavior. An improvement of the CS2 L1b processor is then prototyped and used to obtain a pan-Arctic freeboard data set where the percentage of negative freeboard is successfully minimized.
Original languageEnglish
JournalI E E E Geoscience and Remote Sensing Letters
ISSN1545-598X
DOIs
Publication statusAccepted/In press - 2019

Keywords

  • Terms—CryoSat-2
  • SARIn
  • Altimetry
  • Interferometry
  • Sea ice freeboard

Cite this

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title = "Improving CryoSat-2 SARIn L1b Products to Account for Inaccurate Phase Difference: Impact on Sea Ice Freeboard Retrieval",
abstract = "CryoSat-2 (CS2) is the first mission carrying on board an altimeter instrument able to operate in Synthetic Aperture Radar Interferometric (SARIn) mode. CS2 SARIn acquisitions have been exploited for different scientific applications that take advantage of the capability to determine the across-track angle of the first return and, in particular, they have been proved to reduce the uncertainty of sea ice freeboard retrievals. Nonetheless, the analysis of pan-Arctic freeboard obtained by processing CS2 Baseline C L1b products has shown large negative freeboard estimates in correspondence of the beginning of SARIn acquisitions. Throughout this letter, the SARIn waveforms are analyzed to identify the cause of this behavior. An improvement of the CS2 L1b processor is then prototyped and used to obtain a pan-Arctic freeboard data set where the percentage of negative freeboard is successfully minimized.",
keywords = "Terms—CryoSat-2, SARIn, Altimetry, Interferometry, Sea ice freeboard",
author = "{Di Bella}, Alessandro and Michele Scagliola and Luca Maestri and Henriette Skourup and Ren{\'e} Forsberg",
year = "2019",
doi = "10.1109/LGRS.2019.2919946",
language = "English",
journal = "I E E E Geoscience and Remote Sensing Letters",
issn = "1545-598X",
publisher = "Institute of Electrical and Electronics Engineers",

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TY - JOUR

T1 - Improving CryoSat-2 SARIn L1b Products to Account for Inaccurate Phase Difference: Impact on Sea Ice Freeboard Retrieval

AU - Di Bella, Alessandro

AU - Scagliola, Michele

AU - Maestri, Luca

AU - Skourup, Henriette

AU - Forsberg, René

PY - 2019

Y1 - 2019

N2 - CryoSat-2 (CS2) is the first mission carrying on board an altimeter instrument able to operate in Synthetic Aperture Radar Interferometric (SARIn) mode. CS2 SARIn acquisitions have been exploited for different scientific applications that take advantage of the capability to determine the across-track angle of the first return and, in particular, they have been proved to reduce the uncertainty of sea ice freeboard retrievals. Nonetheless, the analysis of pan-Arctic freeboard obtained by processing CS2 Baseline C L1b products has shown large negative freeboard estimates in correspondence of the beginning of SARIn acquisitions. Throughout this letter, the SARIn waveforms are analyzed to identify the cause of this behavior. An improvement of the CS2 L1b processor is then prototyped and used to obtain a pan-Arctic freeboard data set where the percentage of negative freeboard is successfully minimized.

AB - CryoSat-2 (CS2) is the first mission carrying on board an altimeter instrument able to operate in Synthetic Aperture Radar Interferometric (SARIn) mode. CS2 SARIn acquisitions have been exploited for different scientific applications that take advantage of the capability to determine the across-track angle of the first return and, in particular, they have been proved to reduce the uncertainty of sea ice freeboard retrievals. Nonetheless, the analysis of pan-Arctic freeboard obtained by processing CS2 Baseline C L1b products has shown large negative freeboard estimates in correspondence of the beginning of SARIn acquisitions. Throughout this letter, the SARIn waveforms are analyzed to identify the cause of this behavior. An improvement of the CS2 L1b processor is then prototyped and used to obtain a pan-Arctic freeboard data set where the percentage of negative freeboard is successfully minimized.

KW - Terms—CryoSat-2

KW - SARIn

KW - Altimetry

KW - Interferometry

KW - Sea ice freeboard

U2 - 10.1109/LGRS.2019.2919946

DO - 10.1109/LGRS.2019.2919946

M3 - Journal article

JO - I E E E Geoscience and Remote Sensing Letters

JF - I E E E Geoscience and Remote Sensing Letters

SN - 1545-598X

ER -