Estimation of surface-layer scaling parameters in the unstable boundary layer: implications for orographic flow speed-up

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Argain, J. L., Teixeira, M. ORCID: https://orcid.org/0000-0003-1205-3233 and Miranda, P. M. A. (2017) Estimation of surface-layer scaling parameters in the unstable boundary layer: implications for orographic flow speed-up. Boundary-Layer Meteorology, 165 (1). pp. 145-160. ISSN 0006-8314 doi: 10.1007/s10546-017-0260-3

Abstract/Summary

A method is proposed for estimating the surface-layer depth (zs) and the friction velocity (u∗) as a function of stability (here quantified by the Obukhov length, L) over the complete range of unstable flow regimes. This method extends that developed previously for stable conditions by Argaín et al. (Boundary-Layer Meteorol 130:15–28, 2009), but uses a qualitatively different approach. The method is specifically used to calculate the fractional speed-up (ΔS) in flow over a ridge, although it is suitable for more general boundary-layer applications. The behaviour of zs(L) and u∗(L) as a function of L is indirectly assessed via calculation of ΔS(L) using the linear model of Hunt et al. (Q J R Meteorol Soc 29:16–26, 1988) and its comparison with the field measurements reported in Coppin et al. (Boundary-Layer Meteorol 69:173–199, 1994) and with numerical simulations carried out using a non-linear numerical model, FLEX. The behaviour of ΔS estimated from the linear model is clearly improved when u∗ is calculated using the method proposed here, confirming the importance of accounting for the dependences of zs(L) and u∗(L) on L to better represent processes in the unstable boundary layer.

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Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/70672
Item Type	Article
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Uncontrolled Keywords	Convective boundary layer; Flow speed-up; Friction velocity; Surface-layer height; Unstable stratification
Publisher	Springer
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Funders:	European Commission	The sponsoring bodies who contributed funding for the creation of this item. Example: NERC Example: The Royal Society of Chemistry A pick list of funders may appear as you type in the funder's name in full or as an acronym. Select a correct match to complete the field or type in a new entry in full. For new entries, the full name is preferred.
Projects:	Global to Local Impacts of Flow over Orography (GLIMFLO) Funded by: European Commission (PCIG13-GA-2013-618016 - £71,429) Local Lead (PI): Miguel Teixeira 1 September 2013 - 31 August 2017	Click Add to select your project (received at Reading) from an autocomplete list.

Deposit Details

Date Deposited:	14 Jun 2017 10:54	Date item deposited into CentAUR
Last Modified:	25 Jan 2025 00:18	Date item last modified

References

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