Measuring ocean total surface current velocity with the KuROS and KaRADOC airborne near-nadir Doppler radars: a multi-scale analysis in preparation for the SKIM mission

Marié, Louis; Collard, Fabrice; Nouguier, Frédéric; Pineau-Guillou, Lucia; Hauser, Danièle; Boy, François; Méric, Stéphane; Sutherland, Peter; Peureux, Charles; Monnier, Goulven; Chapron, Bertrand; Martin, Adrien; Dubois, Pierre; Donlon, Craig; Casal, Tania; Ardhuin, Fabrice

doi:https://doi.org/10.5194/os-16-1399-2020

Articles | Volume 16, issue 6

https://doi.org/10.5194/os-16-1399-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/os-16-1399-2020

© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 16, issue 6

Research article

|

13 Nov 2020

Research article |

| 13 Nov 2020

Measuring ocean total surface current velocity with the KuROS and KaRADOC airborne near-nadir Doppler radars: a multi-scale analysis in preparation for the SKIM mission

Louis Marié, Fabrice Collard, Frédéric Nouguier, Lucia Pineau-Guillou, Danièle Hauser, François Boy, Stéphane Méric, Peter Sutherland, Charles Peureux, Goulven Monnier, Bertrand Chapron, Adrien Martin, Pierre Dubois, Craig Donlon, Tania Casal, and Fabrice Ardhuin

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Final revised paper (published on 13 Nov 2020)
Preprint (discussion started on 27 Aug 2019)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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SC1: 'Almost Ready for Final Publication', Roland Romeiser, 02 Jan 2020
- AC1: 'Reply to Interactive comment by Dr Roland Romeiser', Fabrice Ardhuin, 07 May 2020
RC1: 'Evaluation of ``Measuring ocean surface velocities with the KuROS and KaRADOC airborne near-nadir Doppler radars: a multi-scale analysis in preparation of the SKIM mission'' by Marié et al.', Ernesto Rodriguez, 26 Feb 2020
- AC3: 'Reply to reviewer 1', Fabrice Ardhuin, 14 May 2020
RC2: 'os-2019-77', Anonymous Referee #2, 02 Mar 2020
- AC2: 'Reply to comment by anonymous reviewer', Fabrice Ardhuin, 10 May 2020

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Fabrice Ardhuin on behalf of the Authors (04 Jul 2020) Author's response Manuscript

ED: Referee Nomination & Report Request started (16 Jul 2020) by John M. Huthnance

RR by Ernesto Rodriguez (27 Jul 2020)

ED: Publish subject to technical corrections (05 Aug 2020) by John M. Huthnance

Dear Authors
Thank-you again for your much-revised manuscript. The one re-review that I have been able to obtain is very satisfied.
Here follow a few points that the referee and I have noticed, for you please to attend to. I believe you already received some of mine but more are added here.
Thank-you for publishing in Ocean Science.
Yours sincerely
John Huthnance (editor)

Referee comments
This is an excellent restructuring and clarification of the original paper and I recommend that it be published (almost) as is: the presentation is much cleaner and the main points are no longer obscured. I would suggest only fixing typos, of which I found the following:
P. 10. L12: Directional -> directional.
P. 5. L25: should be 100 m s-1, not 10 m s-1
P. 11, L25 (and subsequent): there may be some confusion in the x sign indication of the matrix product Mss-1 x msv0. The x could be taken as a vector cross-product. I suggest replacing with a ., indicating a contraction (or dot product) between an order 2 tensor and an order 1 tensor, leading to a vector as more conventional.
P.22, L18: m s1 should be m s-1

Editor comments
Page 9
Line 9. “techniques, emerges” (add “,”)
Lines 30 and 31. Add “,” after “>” and after Qz, OR remove “,” after “elevation”

Equation 12. msv components should be between [ . . ] ?
Equation 15 and line after. Please standardise notation as kM or κM.
Equation 17. I am puzzled by the disappearance of QH, especially as it appears on page 12 line 15.

Page 12 line 12. “statistics, can be obtained” (add “,”)

Page 14
Line 16. “others” -> “other”
Lines 17, 18. “As . . . however” seem incompatible; omit “however”?

Page 17 line 8. “Pierres Noires” (WMO #62069) . . buoy; please show in figure 6.

Page 29 line 3. Better “affects the magnitude of the computed UWD more at Ku-band than at Ka-band,”? [Word order for “more”]

Figure 8, left panel (22/11/2018). The swell appears to be from the NORTH-west.

Figure 12 caption. In your response to Reviewer 1 “The data shown in figure 12 have been low-pass filtered . . . . . . . This has now been stated explicitly in the caption.” Not apparent to me in caption.

Page 48 line 4. Omit second “)”

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AR by Fabrice Ardhuin on behalf of the Authors (13 Aug 2020) Author's response Manuscript

Post-review adjustments

AA: Author's adjustment | EA: Editor approval

AA by Fabrice Ardhuin on behalf of the Authors (07 Oct 2020) Author's adjustment Manuscript

EA: Adjustments approved (08 Oct 2020) by John M. Huthnance

Short summary

With present-day techniques, ocean surface currents are poorly known near the Equator and globally for spatial scales under 200 km and timescales under 30 d. Wide-swath radar Doppler measurements are an alternative technique. Such direct surface current measurements are, however, affected by platform motions and waves. These contributions are analyzed in data collected during the DRIFT4SKIM airborne and in situ experiment, demonstrating the possibility of measuring currents from space globally.