Description and evaluation of a detailed gas-phase chemistry scheme in the TM5-MP global chemistry transport model (r112)
<p>This work documents and evaluates the tropospheric gas-phase chemical mechanism MOGUNTIA in the three-dimensional chemistry transport model TM5-MP. Compared to the modified CB05 (mCB05) chemical mechanism previously used in the model, MOGUNTIA includes a detailed representation of the l...
Main Authors: | , , , , , , , , , , , , , |
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Format: | Article |
Language: | English |
Published: |
Copernicus Publications
2020-11-01
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Series: | Geoscientific Model Development |
Online Access: | https://gmd.copernicus.org/articles/13/5507/2020/gmd-13-5507-2020.pdf |
Summary: | <p>This work documents and evaluates the tropospheric
gas-phase chemical mechanism MOGUNTIA in the three-dimensional chemistry
transport model TM5-MP. Compared to the modified CB05 (mCB05) chemical
mechanism previously used in the model, MOGUNTIA includes a detailed
representation of the light hydrocarbons (C1–C4) and isoprene, along with a
simplified chemistry representation of terpenes and aromatics. Another
feature implemented in TM5-MP for this work is the use of the Rosenbrock
solver in the chemistry code, which can replace the classical Euler backward
integration method of the model. Global budgets of ozone (O<sub>3</sub>), carbon
monoxide (CO), hydroxyl radicals (OH), nitrogen oxides (NO<sub><i>x</i></sub>), and
volatile organic compounds (VOCs) are analyzed, and their mixing ratios are
compared with a series of surface, aircraft, and satellite observations for
the year 2006. Both mechanisms appear to be able to satisfactorily represent
observed mixing ratios of important trace gases, with the MOGUNTIA chemistry
configuration yielding lower biases than mCB05 compared to measurements in
most of the cases. However, the two chemical mechanisms fail to reproduce
the observed mixing ratios of light VOCs, indicating insufficient primary
emission source strengths, oxidation that is too fast, and/or a low bias in the
secondary contribution to C2–C3 organics via VOC atmospheric oxidation.
Relative computational memory and time requirements of the different model
configurations are also compared and discussed. Overall, the MOGUNTIA scheme
simulates a large suite of oxygenated VOCs that are observed in the
atmosphere at significant levels. This significantly expands the possible
applications of TM5-MP.</p> |
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ISSN: | 1991-959X 1991-9603 |