Dynamics and composition of the Asian summer monsoon anticyclone
This study places HALO research aircraft observations in the upper-tropospheric Asian summer monsoon anticyclone (ASMA) into the context of regional, intra-annual variability by hindcasts with the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The observations were obtained during the Earth Sys...
| Main Authors: | , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Copernicus Publications
2018-04-01
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| Series: | Atmospheric Chemistry and Physics |
| Online Access: | https://www.atmos-chem-phys.net/18/5655/2018/acp-18-5655-2018.pdf |
| _version_ | 1811302771274547200 |
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| author | K.-D. Gottschaldt H. Schlager R. Baumann D. S. Cai V. Eyring P. Graf V. Grewe V. Grewe P. Jöckel T. Jurkat-Witschas C. Voigt C. Voigt A. Zahn H. Ziereis |
| author_facet | K.-D. Gottschaldt H. Schlager R. Baumann D. S. Cai V. Eyring P. Graf V. Grewe V. Grewe P. Jöckel T. Jurkat-Witschas C. Voigt C. Voigt A. Zahn H. Ziereis |
| author_sort | K.-D. Gottschaldt |
| collection | DOAJ |
| description | This study places HALO research aircraft observations in the
upper-tropospheric Asian summer monsoon anticyclone (ASMA) into the context
of regional, intra-annual variability by hindcasts with the ECHAM/MESSy
Atmospheric Chemistry (EMAC) model. The observations were obtained during the
Earth System Model Validation (ESMVal) campaign in September 2012. Observed
and simulated tracer–tracer relations reflect photochemical O<sub>3</sub>
production as well as in-mixing from the lower troposphere and the tropopause
layer. The simulations demonstrate that tropospheric trace gas profiles in
the monsoon season are distinct from those in the rest of the year, and the
measurements reflect the main processes acting throughout the monsoon season.
Net photochemical O<sub>3</sub> production is significantly enhanced in the ASMA,
where uplifted precursors meet increased NO<sub><i>x</i></sub>, mainly produced by
lightning. An analysis of multiple monsoon seasons in the simulation shows
that stratospherically influenced tropopause layer air is regularly entrained
at the eastern ASMA flank and then transported in the southern fringe around
the interior region. Radial transport barriers of the circulation are
effectively overcome by subseasonal dynamical instabilities of the
anticyclone, which occur quite frequently and are of paramount importance for
the trace gas composition of the ASMA. Both the isentropic entrainment of
O<sub>3</sub>-rich air and the photochemical conversion of uplifted O<sub>3</sub>-poor
air tend to increase O<sub>3</sub> in the ASMA outflow. |
| first_indexed | 2024-04-13T07:34:06Z |
| format | Article |
| id | doaj.art-e44fdf362ad2403d9575a3df029ed3f3 |
| institution | Directory Open Access Journal |
| issn | 1680-7316 1680-7324 |
| language | English |
| last_indexed | 2024-04-13T07:34:06Z |
| publishDate | 2018-04-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Chemistry and Physics |
| spelling | doaj.art-e44fdf362ad2403d9575a3df029ed3f32022-12-22T02:56:14ZengCopernicus PublicationsAtmospheric Chemistry and Physics1680-73161680-73242018-04-01185655567510.5194/acp-18-5655-2018Dynamics and composition of the Asian summer monsoon anticycloneK.-D. Gottschaldt0H. Schlager1R. Baumann2D. S. Cai3V. Eyring4P. Graf5V. Grewe6V. Grewe7P. Jöckel8T. Jurkat-Witschas9C. Voigt10C. Voigt11A. Zahn12H. Ziereis13Deutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDelft University of Technology, Aerospace Engineering, Delft, the NetherlandsDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyJohannes Gutenberg-Universität, Institut für Physik der Atmosphäre, Mainz, GermanyKarlsruher Institut für Technologie (KIT), Institut für Meteorologie und Klimaforschung, Karlsruhe, GermanyDeutsches Zentrum für Luft- und Raumfahrt (DLR), Institut für Physik der Atmosphäre, Oberpfaffenhofen, GermanyThis study places HALO research aircraft observations in the upper-tropospheric Asian summer monsoon anticyclone (ASMA) into the context of regional, intra-annual variability by hindcasts with the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The observations were obtained during the Earth System Model Validation (ESMVal) campaign in September 2012. Observed and simulated tracer–tracer relations reflect photochemical O<sub>3</sub> production as well as in-mixing from the lower troposphere and the tropopause layer. The simulations demonstrate that tropospheric trace gas profiles in the monsoon season are distinct from those in the rest of the year, and the measurements reflect the main processes acting throughout the monsoon season. Net photochemical O<sub>3</sub> production is significantly enhanced in the ASMA, where uplifted precursors meet increased NO<sub><i>x</i></sub>, mainly produced by lightning. An analysis of multiple monsoon seasons in the simulation shows that stratospherically influenced tropopause layer air is regularly entrained at the eastern ASMA flank and then transported in the southern fringe around the interior region. Radial transport barriers of the circulation are effectively overcome by subseasonal dynamical instabilities of the anticyclone, which occur quite frequently and are of paramount importance for the trace gas composition of the ASMA. Both the isentropic entrainment of O<sub>3</sub>-rich air and the photochemical conversion of uplifted O<sub>3</sub>-poor air tend to increase O<sub>3</sub> in the ASMA outflow.https://www.atmos-chem-phys.net/18/5655/2018/acp-18-5655-2018.pdf |
| spellingShingle | K.-D. Gottschaldt H. Schlager R. Baumann D. S. Cai V. Eyring P. Graf V. Grewe V. Grewe P. Jöckel T. Jurkat-Witschas C. Voigt C. Voigt A. Zahn H. Ziereis Dynamics and composition of the Asian summer monsoon anticyclone Atmospheric Chemistry and Physics |
| title | Dynamics and composition of the Asian summer monsoon anticyclone |
| title_full | Dynamics and composition of the Asian summer monsoon anticyclone |
| title_fullStr | Dynamics and composition of the Asian summer monsoon anticyclone |
| title_full_unstemmed | Dynamics and composition of the Asian summer monsoon anticyclone |
| title_short | Dynamics and composition of the Asian summer monsoon anticyclone |
| title_sort | dynamics and composition of the asian summer monsoon anticyclone |
| url | https://www.atmos-chem-phys.net/18/5655/2018/acp-18-5655-2018.pdf |
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