scholarly journals Intercomparison of Large-Eddy Simulations of the Antarctic Boundary Layer for Very Stable Stratification

2020 ◽  
Vol 176 (3) ◽  
pp. 369-400
Author(s):  
Fleur Couvreux ◽  
Eric Bazile ◽  
Quentin Rodier ◽  
Björn Maronga ◽  
Georgios Matheou ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Stable Stratification ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Antarctic Boundary Layer ◽  
The Antarctic

scholarly journals Large-Eddy Simulations of the Steady Wintertime Antarctic Boundary Layer

2019 ◽  
Vol 173 (2) ◽  
pp. 165-192 ◽  
Author(s):  
Steven J. A. van der Linden ◽  
John M. Edwards ◽  
Chiel C. van Heerwaarden ◽  
Etienne Vignon ◽  
Christophe Genthon ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Large Eddy Simulations ◽  
Large Eddy ◽  
Antarctic Boundary Layer

Numerical study of stable stratification effects on the wind over simplified tall building models using large-eddy simulations

2021 ◽  
Vol 193 ◽  
pp. 107625
Author(s):  
Zhenqing Liu ◽  
Weipeng Li ◽  
Lian Shen ◽  
Yan Han ◽  
Zhiwen Zhu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Stable Stratification ◽  
Tall Building ◽  
Large Eddy Simulations ◽  
Building Models ◽  
Large Eddy

scholarly journals Large-eddy simulations of the Northeastern US coastal marine boundary layer

2020 ◽  
Vol 1618 ◽  
pp. 062038
Author(s):  
Lawrence C. Cheung ◽  
Colleen M. Kaul ◽  
Alan S. Hsieh ◽  
Myra L. Blaylock ◽  
Matthew J. Churchfield
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Large Eddy Simulations ◽  
Coastal Marine ◽  
Large Eddy

Effective real refractive index of dry aerosols in the Antarctic boundary layer

2006 ◽  
Vol 33 (6) ◽  
Author(s):  
A. Virkkula ◽  
I. K. Koponen ◽  
K. Teinilä ◽  
R. Hillamo ◽  
V-M. Kerminen ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Refractive Index ◽  
Antarctic Boundary Layer ◽  
The Antarctic ◽  
Real Refractive Index

scholarly journals Large-Eddy Simulations of a Drizzling, Stratocumulus-Topped Marine Boundary Layer

2009 ◽  
Vol 137 (3) ◽  
pp. 1083-1110 ◽  
Author(s):  
Andrew S. Ackerman ◽  
Margreet C. vanZanten ◽  
Bjorn Stevens ◽  
Verica Savic-Jovcic ◽  
Christopher S. Bretherton ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Marine Boundary Layer ◽  
Cloud Water ◽  
Large Eddy Simulations ◽  
Cloud Base ◽  
Entrainment Rate ◽  
Liquid Water Path ◽  
Average Maximum ◽  
Large Eddy ◽  
The Mean

Abstract Cloud water sedimentation and drizzle in a stratocumulus-topped boundary layer are the focus of an intercomparison of large-eddy simulations. The context is an idealized case study of nocturnal stratocumulus under a dry inversion, with embedded pockets of heavily drizzling open cellular convection. Results from 11 groups are used. Two models resolve the size distributions of cloud particles, and the others parameterize cloud water sedimentation and drizzle. For the ensemble of simulations with drizzle and cloud water sedimentation, the mean liquid water path (LWP) is remarkably steady and consistent with the measurements, the mean entrainment rate is at the low end of the measured range, and the ensemble-average maximum vertical wind variance is roughly half that measured. On average, precipitation at the surface and at cloud base is smaller, and the rate of precipitation evaporation greater, than measured. Including drizzle in the simulations reduces convective intensity, increases boundary layer stratification, and decreases LWP for nearly all models. Including cloud water sedimentation substantially decreases entrainment, decreases convective intensity, and increases LWP for most models. In nearly all cases, LWP responds more strongly to cloud water sedimentation than to drizzle. The omission of cloud water sedimentation in simulations is strongly discouraged, regardless of whether or not precipitation is present below cloud base.

scholarly journals Comparison of Large Eddy Simulations of a convective boundary layer with wind LIDAR measurements

2012 ◽  
Vol 8 (1) ◽  
pp. 83-86 ◽  
Author(s):  
J. G. Pedersen ◽  
M. Kelly ◽  
S.-E. Gryning ◽  
R. Floors ◽  
E. Batchvarova ◽  
...  
Keyword(s):  
Boundary Layer ◽  
Wind Speed ◽  
Geostrophic Wind ◽  
Large Eddy Simulations ◽  
Horizontal Wind ◽  
Convective Boundary ◽  
Horizontal Wind Speed ◽  
Large Eddy ◽  
Lidar Measurements ◽  
Wind Lidar

Abstract. Vertical profiles of the horizontal wind speed and of the standard deviation of vertical wind speed from Large Eddy Simulations of a convective atmospheric boundary layer are compared to wind LIDAR measurements up to 1400 m. Fair agreement regarding both types of profiles is observed only when the simulated flow is driven by a both time- and height-dependent geostrophic wind and a time-dependent surface heat flux. This underlines the importance of mesoscale effects when the flow above the atmospheric surface layer is simulated with a computational fluid dynamics model.

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