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| Titel |
On the computation of planetary boundary-layer height using the bulk Richardson number method |
| VerfasserIn |
Y. Zhang, Z. Gao, D. Li, Y. Li, N. Zhang, X. Zhao, J. Chen |
| 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 ; 7, no. 6 ; Nr. 7, no. 6 (2014-11-10), S.2599-2611 |
| Datensatznummer |
250115773
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| Publikation (Nr.) |
 copernicus.org/gmd-7-2599-2014.pdf |
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| Zusammenfassung |
| Experimental data from four field campaigns are used to explore the
variability of the bulk Richardson number of the entire planetary boundary
layer (PBL), Ribc, which is a key parameter for
calculating the PBL height (PBLH) in numerical weather and climate models
with the bulk Richardson number method. First, the PBLHs of three different
thermally stratified boundary layers (i.e., strongly stable boundary layers,
weakly stable boundary layers, and unstable boundary layers) from the four
field campaigns are determined using the turbulence method, the potential
temperature gradient method, the low-level jet method, and the modified
parcel method. Then for each type of boundary layer, an optimal
Ribc is obtained through linear fitting and statistical
error minimization methods so that the bulk Richardson method with this
optimal Ribc yields similar estimates of PBLHs as the
methods mentioned above. We find that the optimal Ribc
increases as the PBL becomes more unstable: 0.24 for strongly stable boundary
layers, 0.31 for weakly stable boundary layers, and 0.39 for unstable
boundary layers. Compared with previous schemes that use a single value of
Ribc in calculating the PBLH for all types of boundary
layers, the new values of Ribc proposed by this study
yield more accurate estimates of PBLHs. |
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