Articles | Volume 10, issue 3
https://doi.org/10.5194/gmd-10-1157-2017
https://doi.org/10.5194/gmd-10-1157-2017
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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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)
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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.