Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI <i>δ</i>D observations

Lacour, Jean-Lionel; Flamant, Cyrille; Risi, Camille; Clerbaux, Cathy; Coheur, Pierre-François

doi:https://doi.org/10.5194/acp-17-9645-2017

Articles | Volume 17, issue 15

https://doi.org/10.5194/acp-17-9645-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-17-9645-2017

© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 17, issue 15

Research article

|

10 Aug 2017

Research article |

| 10 Aug 2017

Importance of the Saharan heat low in controlling the North Atlantic free tropospheric humidity budget deduced from IASI δD observations

Jean-Lionel Lacour, Cyrille Flamant, Camille Risi, Cathy Clerbaux, and Pierre-François Coheur

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Final revised paper (published on 10 Aug 2017)
Preprint (discussion started on 21 Mar 2017)

Interactive discussion

Status: closed

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

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RC1: 'Review', Anonymous Referee #2, 30 Mar 2017
- AC1: 'Responses to reviewer #2', Jean-Lionel Lacour, 09 Jul 2017
RC2: 'Review of 'Importance of the Saharan Heat Low on the control of the North Atlantic free tropospheric humidity deduced from IASI dD observations' by Lacour et al.', Anonymous Referee #1, 12 Apr 2017
- AC2: 'Responses to reviewer #1', Jean-Lionel Lacour, 09 Jul 2017
SC1: 'Comment on Lacour et al. (2017) and its relation to previous works', Matthias Schneider, 13 Apr 2017
- AC3: 'Responses to Matthias Schneider', Jean-Lionel Lacour, 09 Jul 2017

Peer-review completion

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

AR by Jean-Lionel Lacour on behalf of the Authors (09 Jul 2017) Author's response Manuscript

ED: Publish subject to technical corrections (10 Jul 2017) by Heini Wernli

AR by Jean-Lionel Lacour on behalf of the Authors (10 Jul 2017) Author's response Manuscript

Short summary

We present temporal and spatial δD distributions derived from IASI obtained above the North Atlantic in the vicinity of West Africa. We show that the seasonality of δD in the North Atlantic is closely associated with the influence of the Saharan heat low (SHL). We provide an interpretation of the temporal and spatial variations in δD and show that the interactions between the large-scale subsidence, the ITCZ, and the SHL can be disentangled thanks to the added information contained in δD.