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| Titel |
PORT, a CESM tool for the diagnosis of radiative forcing |
| VerfasserIn |
A. J. Conley, J.-F. Lamarque, F. Vitt, W. D. Collins, J. Kiehl |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1991-959X
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| Digitales Dokument |
URL |
| Erschienen |
In: Geoscientific Model Development ; 6, no. 2 ; Nr. 6, no. 2 (2013-04-10), S.469-476 |
| Datensatznummer |
250017803
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| Publikation (Nr.) |
 copernicus.org/gmd-6-469-2013.pdf |
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| Zusammenfassung |
| The Parallel Offline Radiative Transfer (PORT) model is a stand-alone
tool, driven by model-generated datasets, that can be used for any radiation calculation
that the underlying radiative transfer schemes can perform, such as diagnosing radiative
forcing. In its present distribution, PORT isolates the radiation code from the Community
Atmosphere Model (CAM4) in the Community Earth System Model (CESM1). The current
configuration focuses on CAM4 radiation with the constituents as represented in
present-day conditions in CESM1, along with their optical properties. PORT includes an
implementation of stratospheric temperature adjustment under the assumption of fixed
dynamical heating, which is necessary to compute radiative forcing in
addition to the more straightforward instantaneous radiative forcing. PORT can be extended to use
radiative constituent distributions from other models or model simulations. Ultimately,
PORT can be used with various radiative transfer models.
As illustrations of the use of PORT, we perform the computation of radiative forcing from
doubling of carbon dioxide, from the change of tropospheric ozone concentration from the year
1850 to 2000, and from present-day aerosols. The radiative forcing from tropospheric ozone (with
respect to 1850) generated by a collection of model simulations under the Atmospheric
Chemistry and Climate Model Intercomparison Project is found to be 0.34 (with an
intermodel standard deviation of 0.07) W m−2. Present-day aerosol direct forcing
(relative to no aerosols) is found to be −1.3 W m−2. |
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