NDLI: Derivation of Structure Parameters of Temperature and Humidity in the Convective Boundary Layer from Large-Eddy Simulations and Implications for the Interpretation of Scintillometer Observations

Content Provider	Springer Nature Link
Author	Maronga, Björn Moene, Arld F. Dinther, Daniëlle Raasch, Siegfried Bosveld, Fred C. Gioli, Beniami
Copyright Year	2013
Abstract	We derive the turbulent structure parameters of temperature $$C_{T}^2$$ and humidity $$C_q^2$$ from high-resolution large-eddy simulations (LES) of a homogeneously-heated convective boundary layer. Boundary conditions and model forcing were derived from measurements at Cabauw in The Netherlands. Three different methods to obtain the structure-parameters from LES are investigated. The shape of the vertical structure-parameter profiles from all three methods compare well with former experimental and LES results. Depending on the method, deviations in the magnitude up to a factor of two are found and traced back to the effects of discretization and numerical dissipation of the advection scheme. Furthermore, we validate the LES data with airborne and large-aperture scintillometer (LAS) measurements at Cabauw. Virtual path measurements are used to study the variability of $$C_{T}^2$$ in the mixed layer and surface layer and its implications for airborne and LAS measurements. A high variability of $$C_{T}^2$$ along a given horizontal path in the LES data is associated with plumes (high values) and downdrafts (low values). The path average of $$C_{T}^2$$ varies rapidly in time due to the limited path length. The LES results suggest that measured path averages require sufficient temporal averaging and an adequate ratio of path length to height above the ground for the LAS in order to approach the domain average of $$C_{T}^2$$ .
Starting Page	1
Ending Page	30
Page Count	30
File Format	PDF
ISSN	00068314
Journal	Boundary-Layer Meteorology
Volume Number	148
Issue Number	1
e-ISSN	15731472
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-02-12
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Convective boundary layer Large-eddy simulation Turbulent structure parameter Virtual scintillometer Atmospheric Sciences Meteorology Atmospheric Protection/Air Quality Control/Air Pollution
Content Type	Text
Resource Type	Article
Subject	Atmospheric Science

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