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| Home > Publications database > Upward transport of boundary layer air to altitudes of the Asian summer monsoon anticyclone in Eulerian and Lagrangian model simulations |
| Home > Publications database > Upward transport of boundary layer air to altitudes of the Asian summer monsoon anticyclone in Eulerian and Lagrangian model simulations |
| Typ | Amount | VAT | Currency | Share | Status | Cost centre |
| APC | 1817.65 | 0.00 | EUR | 100.00 % | (Zahlung erfolgt) | ZB |
| Sum | 1817.65 | 0.00 | EUR | |||
| Total | 1817.65 |
| Journal Article | FZJ-2025-05794 |
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2025
E. Schweizerbart Science Publishers
Stuttgart
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Please use a persistent id in citations: doi:10.1127/metz/1266 doi:10.34734/FZJ-2025-05794
Abstract: The Asian summer monsoon anticyclone is a dominant circulation system in the upper troposphere and lowerstratosphere (UTLS) in boreal summer (about June–September). An appropriate simulation of the monsoon anticycloneis an important challenge for chemistry climate and chemistry transport models. Here we compare simulations of theECHAM5/MESSy Chemistry Climate model (EMAC) and the Chemical Lagrangian Model of the Stratosphere (CLaMS)based on the European Centre for Medium-Range Weather Forecasts Reanalysis-Interim (ERA-Interim); EMAC simulations are nudged towards ERA-Interim, whereas transport in CLaMS is driven by ERA-Interim. We employ surfaceorigin tracers for continental South Asia. These surface origin tracers are lifted upward into the Asian summer monsoonanticyclone, both in EMAC and CLaMS. We investigate monsoon conditions for boreal summer 2015. In summer 2015,the entire monsoon, and in particular upward transport in the monsoon anticyclone, was strongly influenced by El Niño. Inboth models, in 2015, the simulated impact of surface origin tracers on the composition of air in the Asian summer monsoonanticyclone is very weak at 420 K. Further, in both models, a very strong decline with altitude (between ≈ 370–400 K) ofsurface origin tracers is obvious. The pattern of the Asian monsoon anticyclone in August and early September is represented very similarly in EMAC and CLaMS, with a lower fraction of the surface origin tracer for continental South Asia inCLaMS. The simulated pattern of surface origin tracers in the Asian summer monsoon anticyclone in CLaMS is much lesssmooth than in EMAC. Finally, we find a strong day-to-day variability in the Asian summer monsoon anticyclone and aconfinement of monsoon air at UTLS altitudes (≈370 K to 400 K) similarly in both, EMAC and CLaMS.
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