representation of the community earth system model (cesm1) cam4-chem within the chemistry-climate model initiative (ccmi)
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ID: 169291
2016
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Abstract
The Community Earth System Model (CESM1) CAM4-chem has been used to perform
the Chemistry Climate Model Initiative (CCMI) reference and sensitivity
simulations. In this model, the Community Atmospheric Model version 4 (CAM4)
is fully coupled to tropospheric and stratospheric chemistry. Details and
specifics of each configuration, including new developments and improvements
are described. CESM1 CAM4-chem is a low-top model that reaches up to
approximately 40 km and uses a horizontal resolution of 1.9°
latitude and 2.5° longitude. For the specified dynamics experiments,
the model is nudged to Modern-Era Retrospective Analysis for Research and Applications (MERRA) reanalysis. We summarize the performance of the three
reference simulations suggested by CCMI, with a focus on the last 15 years of
the simulation when most observations are available. Comparisons with
selected data sets are employed to demonstrate the general performance of the
model. We highlight new data sets that are suited for multi-model evaluation
studies. Most important improvements of the model are the treatment of
stratospheric aerosols and the corresponding adjustments for radiation and
optics, the updated chemistry scheme including improved polar chemistry and
stratospheric dynamics and improved dry deposition rates. These updates lead
to a very good representation of tropospheric ozone within 20 % of values
from available observations for most regions. In particular, the trend and
magnitude of surface ozone is much improved compared to earlier versions of
the model. Furthermore, stratospheric column ozone of the Southern Hemisphere
in winter and spring is reasonably well represented. All experiments still
underestimate CO most significantly in Northern Hemisphere spring and show a
significant underestimation of hydrocarbons based on surface observations.
| Reference Key |
tilmes2016geoscientificrepresentation
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| Authors | ;S. Tilmes;J.-F. Lamarque;L. K. Emmons;D. E. Kinnison;D. Marsh;R. R. Garcia;A. K. Smith;R. R. Neely;A. Conley;F. Vitt;M. Val Martin;H. Tanimoto;I. Simpson;D. R. Blake;N. Blake |
| Journal | international journal of quantum chemistry |
| Year | 2016 |
| DOI |
10.5194/gmd-9-1853-2016
|
| URL | |
| Keywords |
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