A 4D-Var inversion system based on the icosahedral grid model (NICAM-TM 4D-Var v1.0) – Part 1: Offline forward and adjoint transport models

Niwa, Yosuke; Tomita, Hirofumi; Satoh, Masaki; Imasu, Ryoichi; Sawa, Yousuke; Tsuboi, Kazuhiro; Matsueda, Hidekazu; Machida, Toshinobu; Sasakawa, Motoki; Belan, Boris; Saigusa, Nobuko

doi:https://doi.org/10.5194/gmd-10-1157-2017

Articles | Volume 10, issue 3

https://doi.org/10.5194/gmd-10-1157-2017

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

https://doi.org/10.5194/gmd-10-1157-2017

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

Articles | Volume 10, issue 3

Development and technical paper

|

17 Mar 2017

Development and technical paper |

| 17 Mar 2017

A 4D-Var inversion system based on the icosahedral grid model (NICAM-TM 4D-Var v1.0) – Part 1: Offline forward and adjoint transport models

Yosuke Niwa, Hirofumi Tomita, Masaki Satoh, Ryoichi Imasu, Yousuke Sawa, Kazuhiro Tsuboi, Hidekazu Matsueda, Toshinobu Machida, Motoki Sasakawa, Boris Belan, and Nobuko Saigusa

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Final revised paper (published on 17 Mar 2017)
Preprint (discussion started on 11 Oct 2016)

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'Well prepared manuscript', Maarten Krol, 06 Nov 2016
- AC1: 'Reply to Maarten Krol', Yosuke Niwa, 06 Feb 2017
RC2: 'Solid and relevant manuscript', Arne Babenhauserheide, 09 Jan 2017
- AC2: 'Reply to Arne Babenhauserheide', Yosuke Niwa, 06 Feb 2017

Peer-review completion

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

AR by Yosuke Niwa on behalf of the Authors (06 Feb 2017) Author's response Manuscript

ED: Publish as is (20 Feb 2017) by Volker Grewe

AR by Yosuke Niwa on behalf of the Authors (21 Feb 2017)

Short summary

We have developed forward and adjoint models based on NICAM-TM, as part of the 4D-Var system for atmospheric GHGs inversions. The models are computationally efficient enough to make the 4D-Var iterative calculation feasible. Trajectory analysis for high-CO₂ concentration events are performed to test adjoint sensitivities; we also demonstrate the potential usefulness of our adjoint model for diagnosing tracer transport.