eprintid: 1436748
rev_number: 35
eprint_status: archive
userid: 608
dir: disk0/01/43/67/48
datestamp: 2014-08-06 11:17:41
lastmod: 2021-12-13 02:24:10
status_changed: 2014-08-29 15:20:44
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Haines, PE
creators_name: Esler, JG
creators_name: Carver, GD
title: Technical Note: Adjoint formulation of the TOMCAT atmospheric transport scheme in the Eulerian backtracking framework (RETRO-TOM)
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F59
note: © Author(s) 2014. This work is distributed
under the Creative Commons Attribution 3.0 License. http://creativecommons.org/licenses/by/3.0/
abstract: A new methodology for the formulation of an adjoint to the transport component of the chemistry transport model TOMCAT is described and implemented in a new model, RETRO-TOM. The Eulerian backtracking method is used, allowing the forward advection scheme (Prather's second-order moments) to be efficiently exploited in the backward adjoint calculations. Prather's scheme is shown to be time symmetric, suggesting the possibility of high accuracy. To attain this accuracy, however, it is necessary to make a careful treatment of the "density inconsistency" problem inherent to offline transport models. The results are verified using a series of test experiments. These demonstrate the high accuracy of RETRO-TOM when compared with direct forward sensitivity calculations, at least for problems in which flux limiters in the advection scheme are not required. RETRO-TOM therefore combines the flexibility and stability of a "finite difference of adjoint" formulation with the accuracy of an "adjoint of finite difference" formulation.
date: 2014
official_url: http://dx.doi.org/10.5194/acp-14-5477-2014
vfaculties: VMPS
oa_status: green
full_text_type: pub
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_source: WoS-Lite
elements_id: 966846
doi: 10.5194/acp-14-5477-2014
lyricists_name: Esler, James
lyricists_id: JGESL00
full_text_status: public
publication: Atmospheric Chemistry and Physics
volume: 14
number: 11
pagerange: 5477 - 5493
issn: 1680-7316
citation:        Haines, PE;    Esler, JG;    Carver, GD;      (2014)    Technical Note: Adjoint formulation of the TOMCAT atmospheric transport scheme in the Eulerian backtracking framework (RETRO-TOM).                   Atmospheric Chemistry and Physics , 14  (11)   5477 - 5493.    10.5194/acp-14-5477-2014 <https://doi.org/10.5194/acp-14-5477-2014>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1436748/1/acp-14-5477-2014.pdf