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| Titel |
Evaluation of archived and off-line diagnosed vertical diffusion coefficients from ERA-40 with ²²²Rn simulations |
| VerfasserIn |
D. J. L. Olivié, P. F. J. Velthoven, A. C. M. Beljaars |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 4, no. 9/10 ; Nr. 4, no. 9/10 (2004-11-26), S.2313-2336 |
| Datensatznummer |
250001414
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| Publikation (Nr.) |
 copernicus.org/acp-4-2313-2004.pdf |
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| Zusammenfassung |
| Boundary layer turbulence has a profound influence on the distribution of
tracers with sources or sinks at the surface. The 40-year ERA-40
meteorological data set of the European Centre for Medium-range Weather
Forecasts contains archived vertical diffusion coefficients. We evaluated the
use of these archived diffusion coefficients versus off-line diagnosed
coefficients based on other meteorological parameters archived during ERA-40
by examining the influence on the distribution of the radionuclide
222Rn in the chemistry transport model TM3. In total four different
sets of vertical diffusion coefficients are compared: (i) 3-hourly vertical
diffusion coefficients archived during the ERA-40 project, (ii) 3-hourly
off-line diagnosed coefficients from a non-local scheme based on
Holtslag and Boville (1993), Vogelezang
and Holtslag (1996), and Beljaars and Viterbo (1999), (iii) 6-hourly
coefficients archived during the ERA-40 project, and (iv) 6-hourly off-line
diagnosed coefficients based on a local scheme described in Louis (1979) and Louis et al. (1982). The diffusion scheme to diagnose the coefficients
off-line in (ii) is similar to the diffusion scheme used during the ERA-40
project (i and iii). |
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