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| 001 | 910157 | ||
| 005 | 20240712100846.0 | ||
| 024 | 7 | _ | |a 10.5194/gmd-15-7471-2022 |2 doi |
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| 100 | 1 | _ | |a Konopka, Paul |0 P:(DE-Juel1)129130 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Tropospheric transport and unresolved convection: numerical experiments with CLaMS 2.0/MESSy |
| 260 | _ | _ | |a Katlenburg-Lindau |c 2022 |b Copernicus |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a Pure Lagrangian, i.e., trajectory-based transport models, take into account only the resolved advective part of transport. That means neither mixing processes between the air parcels (APs) nor unresolved subgrid-scale advective processes like convection are included. The Chemical Lagrangian Model of the Stratosphere (CLaMS 1.0) extends this approach by including mixing between the Lagrangian APs parameterizing the small-scale isentropic mixing. To improve model representation of the upper troposphere and lower stratosphere (UTLS), this approach was extended by taking into account parameterization of tropospheric mixing and unresolved convection in the recently published CLaMS 2.0 version. All three transport modes, i.e., isentropic and tropospheric mixing and the unresolved convection can be adjusted and optimized within the model. Here, we investigate the sensitivity of the model representation of tracers in the UTLS with respect to these three modes.For this reason, the CLaMS 2.0 version implemented within the Modular Earth Submodel System (MESSy), CLaMS 2.0/MESSy, is applied with meteorology based on the ERA-Interim (EI) and ERA5 (E5) reanalyses with the same horizontal resolution (1.0×1.0∘) but with 60 and 137 model levels for EI and E5, respectively. Comparisons with in situ observations are used to rate the degree of agreement between different model configurations and observations. Starting from pure advective runs as a reference and in agreement with CLaMS 1.0, we show that among the three processes considered, isentropic mixing dominates transport in the UTLS. Both the observed CO, O3, N2O, and CO2 profiles and CO–O3 correlations are clearly better reproduced in the model with isentropic mixing. The second most important transport process considered is convection which is only partially resolved in the vertical velocity fields provided by the analysis. This additional pathway of transport from the planetary boundary layer (PBL) to the main convective outflow dominates the composition of air in the lower stratosphere relative to the contribution of the resolved transport. This transport happens mainly in the tropics and sub-tropics, and significantly rejuvenates the age of air in this region. By taking into account tropospheric mixing, weakest changes in tracer distributions without any clear improvements were found. |
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| 700 | 1 | _ | |a Tao, Mengchu |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a von Hobe, Marc |0 P:(DE-Juel1)129170 |b 2 |
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| 773 | _ | _ | |a 10.5194/gmd-15-7471-2022 |g Vol. 15, no. 19, p. 7471 - 7487 |0 PERI:(DE-600)2456725-5 |n 19 |p 7471 - 7487 |t Geoscientific model development |v 15 |y 2022 |x 1991-959X |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/910157/files/gmd-15-7471-2022.pdf |y OpenAccess |
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