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| Titel |
The role of urban boundary layer investigated with high-resolution models and ground-based observations in Rome area: a step towards understanding parameterization potentialities |
| VerfasserIn |
E. Pichelli, R. Ferretti, M. Cacciani, A. M. Siani, V. Ciardini, T. Di Iorio |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 1 ; Nr. 7, no. 1 (2014-01-30), S.315-332 |
| Datensatznummer |
250115574
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| Publikation (Nr.) |
 copernicus.org/amt-7-315-2014.pdf |
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| Zusammenfassung |
| The urban forcing on thermodynamical conditions can greatly influence the local
evolution of the atmospheric boundary layer. Heat stored in an urban
environment can produce noteworthy mesoscale perturbations of the lower
atmosphere. The new generation of high-resolution numerical weather
prediction models (NWP) is nowadays often applied also to urban areas. An
accurate representation of cities is key role because of the cities' influence
on wind, temperature and water vapor content of the planetary boundary layer
(PBL). The Advanced Weather Research and Forecasting model WRF (ARW) has been used to reproduce the
circulation in the urban area of Rome. A sensitivity study is performed using
different PBL and surface schemes. The significant role of the surface
forcing in the PBL evolution has been investigated by comparing model results
with observations coming from many instruments (lidar, sodar, sonic
anemometer and surface stations). The impact of different urban canopy models
(UCMs) on the forecast has also been investigated. One meteorological event
will be presented, chosen as statistically relevant for the area of interest.
The WRF-ARW model shows a tendency to overestimate the vertical transport of
horizontal momentum from upper levels to low atmosphere if strong large-scale
forcing occurs. This overestimation is partially corrected by a local PBL
scheme coupled with an advanced UCM. Moreover, a general underestimation of
vertical motions has been verified. |
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