Preprints
https://doi.org/10.5194/egusphere-2022-842
https://doi.org/10.5194/egusphere-2022-842
12 Sep 2022
 | 12 Sep 2022

Directional Surface Wave Spectra And Sea Ice Structure from ICEsat-2 Altimetry

Momme C. Hell and Christopher Horvat

Abstract. Sea ice plays an important role in Earth's energy budget by impacting surface albedo and air-sea fluxes in polar regions. On its margins, sea ice is heavily impacted by waves and we currently do not have routine observations of waves in sea ice and lack understanding of how waves interact with sea ice and how they attenuate.

In this paper, we propose methods to separate the two-dimensional (2D) surface wave spectra from sea ice height observations along each ICESat-2 track. A combination of a linear inverse method, called Generalized Fourier Transform (GFT), to estimate the wave spectra along each beam and a Metropolitan Hasting algorithm to estimate the dominant wave's incident angle was developed. It allows us to estimate the 2D wave signal and its uncertainty from the high-density, unstructured ATL03 ICESat-2 photon retrievals. The GFT is applied to re-binned photon retrials on 25 km segments for all six beams and outperforms a discrete Fourier transform in accuracy while having fewer constraints on the data structure.

The Metropolitan Hasting algorithm infers the wave direction from beam pairs every 25 km using coherent crests of the most energetic waves. Both methods together allow a decomposition into a 2D surface wave spectra with the advantage that the residual surface heights can potentially be attributed to other sea ice properties. The described method can routinely decompose ICESat-2 tracks and constrain wave attenuation in sea ice.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.

Journal article(s) based on this preprint

19 Jan 2024
A method for constructing directional surface wave spectra from ICESat-2 altimetry
Momme C. Hell and Christopher Horvat
The Cryosphere, 18, 341–361, https://doi.org/10.5194/tc-18-341-2024,https://doi.org/10.5194/tc-18-341-2024, 2024
Short summary
Momme C. Hell and Christopher Horvat

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-842', Anonymous Referee #1, 12 Dec 2022
    • AC1: 'Reply on RC1', Momme Hell, 11 Aug 2023
  • RC2: 'Comment on egusphere-2022-842', Anonymous Referee #2, 27 May 2023
    • AC2: 'Reply on RC2', Momme Hell, 11 Aug 2023

Interactive discussion

Status: closed

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-842', Anonymous Referee #1, 12 Dec 2022
    • AC1: 'Reply on RC1', Momme Hell, 11 Aug 2023
  • RC2: 'Comment on egusphere-2022-842', Anonymous Referee #2, 27 May 2023
    • AC2: 'Reply on RC2', Momme Hell, 11 Aug 2023

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload
ED: Reconsider after major revisions (further review by editor and referees) (14 Aug 2023) by Jari Haapala
AR by Momme Hell on behalf of the Authors (14 Aug 2023)  Author's response   Author's tracked changes   Manuscript 
ED: Publish subject to revisions (further review by editor and referees) (24 Aug 2023) by Jari Haapala
ED: Referee Nomination & Report Request started (09 Oct 2023) by Jari Haapala
RR by Marcello Vichi (20 Oct 2023)
RR by Anonymous Referee #2 (22 Nov 2023)
ED: Publish subject to technical corrections (23 Nov 2023) by Jari Haapala
AR by Momme Hell on behalf of the Authors (29 Nov 2023)  Author's response   Manuscript 

Journal article(s) based on this preprint

19 Jan 2024
A method for constructing directional surface wave spectra from ICESat-2 altimetry
Momme C. Hell and Christopher Horvat
The Cryosphere, 18, 341–361, https://doi.org/10.5194/tc-18-341-2024,https://doi.org/10.5194/tc-18-341-2024, 2024
Short summary
Momme C. Hell and Christopher Horvat

Data sets

Data for Directional Surface Wave Spectra And Sea Ice Structure from ICEsat-2 Altimetry Momme Hell https://zenodo.org/record/6928350

Model code and software

Code for Directional Surface Wave Spectra And Sea Ice Structure from ICEsat-2 Altimetry Momme Hell https://zenodo.org/record/6908645

Momme C. Hell and Christopher Horvat

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Latest update: 18 Sep 2024
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Short summary
Sea ice is heavily impacted by waves on its margins and we currently do not have routine observations of waves in sea ice. Here we propose two methods to separate the surface waves from the sea ice height observations along each ICESat-2 track using machine learning. Both methods together allow us to follow changes in the wave height through the sea ice. They can also be used to remove the wave signal and to better estimate the sea ice thickness.