2020
DOI: 10.5194/acp-20-15227-2020
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Impact of Lagrangian transport on lower-stratospheric transport timescales in a climate model

Abstract: Abstract. We investigate the impact of model trace gas transport schemes on the representation of transport processes in the upper troposphere and lower stratosphere. Towards this end, the Chemical Lagrangian Model of the Stratosphere (CLaMS) was coupled to the ECHAM/MESSy Atmospheric Chemistry (EMAC) model and results from the two transport schemes (Lagrangian critical Lyapunov scheme and flux-form semi-Lagrangian, respectively) were compared. Advection in CLaMS was driven by the EMAC simulation winds, and th… Show more

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Cited by 6 publications
(5 citation statements)
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“…We examined the impacts of stratospheric water vapor on atmospheric temperatures and circulation and explored the role of model transport schemes in the model moist bias by carrying out an experiment with the comprehensive climate model EMAC 23 , wherein two different transport schemes were applied. The first model version applies the standard Flux-Form Semi-Lagrangian transport scheme 24 , termed control “ctrl EMAC”, and the second a purely Lagrangian scheme (modified “mod” EMAC–CLaMS), which was developed within the Chemical Lagrangian Model of the Stratosphere CLaMS 25 to improve the representation of stratospheric transport 26 , 27 . In the modified EMAC–CLaMS simulation, only stratospheric water vapor from the Lagrangian calculation is fed into the radiation scheme, to allow isolating radiative effects of stratospheric water vapor (“Methods” section).…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…We examined the impacts of stratospheric water vapor on atmospheric temperatures and circulation and explored the role of model transport schemes in the model moist bias by carrying out an experiment with the comprehensive climate model EMAC 23 , wherein two different transport schemes were applied. The first model version applies the standard Flux-Form Semi-Lagrangian transport scheme 24 , termed control “ctrl EMAC”, and the second a purely Lagrangian scheme (modified “mod” EMAC–CLaMS), which was developed within the Chemical Lagrangian Model of the Stratosphere CLaMS 25 to improve the representation of stratospheric transport 26 , 27 . In the modified EMAC–CLaMS simulation, only stratospheric water vapor from the Lagrangian calculation is fed into the radiation scheme, to allow isolating radiative effects of stratospheric water vapor (“Methods” section).…”
Section: Resultsmentioning
confidence: 99%
“…In the “control” EMAC simulation, trace gas transport is calculated with the standard EMAC Flux-Form Semi-Lagrangian transport scheme. In the “modified” EMAC–CLaMS simulation, a newly incorporated Lagrangian transport scheme is applied for the calculation of water vapor transport in the stratosphere 26 , 27 . For both simulations, a ten year spin-up period was simulated using the control settings starting from January 1, 1970, initialized from ESCiMo simulation RC1-base-07.…”
Section: Methodsmentioning
confidence: 99%
“…We examined the impacts of stratospheric water vapor on atmospheric temperatures and circulation and explored the role of model transport schemes in the model moist bias by carrying out an experiment with the comprehensive climate model EMAC [23], wherein two different transport schemes were applied. The first model version applies the standard Flux-Form Semi-Lagrangian transport scheme [24], termed "control" EMAC, and the second a purely Lagrangian scheme ("modified" EMAC), which was developed within the Chemical Lagrangian Model of the Stratosphere CLaMS [25] to improve the representation of stratospheric transport [26,27]. In the "modified" EMAC simulation, only stratospheric water vapor from the Lagrangian calculation is fed into the radiation scheme, to allow isolating radiative effects of stratospheric water vapor (Methods)…”
Section: Lowermost Stratospheric Water Vapor In Modelsmentioning
confidence: 99%
“…In the "control" EMAC simulation, trace gas transport is calculated with the standard EMAC Flux-Form Semi-Lagrangian transport scheme. In the "modified" EMAC simulation, a newly incorporated Lagrangian transport scheme is applied for the calculation of water vapor transport in the stratosphere [26,27]. A ten year spin-up period was simulated using the control settings starting from January 1, 1970.…”
Section: Emac Model Experimentsmentioning
confidence: 99%
“…Due to its Lagrangian nature, the CLaMS transport scheme has largely reduced numerical diffusion compared to the standard EMAC transport (Hoppe et al, 2014;Charlesworth et al, 2020). In both simulations the water vapour is coupled to the model radiation and thereby affects atmospheric temperature and circulation.…”
Section: Emac Model Simulationsmentioning
confidence: 99%