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SUMMARY:Very-large scale motions in the atmospheric surface layer - Guohua
  Wang\, Lanzhou University\, China
DTSTART:20210618T150000Z
DTEND:20210618T153000Z
UID:TALK161023@talks.cam.ac.uk
CONTACT:Dr C. P.  Caulfield
DESCRIPTION:Very-large scale motions (VLSMs) are typical structures in wal
 l-bounded turbulence at high Reynolds number\, which make important contri
 butions to mass and energy transport. This talk will present the atmospher
 ic surface layer observations carried out at the Qingtu Lake observation a
 rray (QLOA) site. Furthermore\, some studies on the VLSMs in the atmospher
 ic surface layer based on the observed data are introduced\, including the
  morphological and dynamic characteristics of the VLSMs and its effect on 
 the sand dust transportation. The influences of dust particles and heat fl
 ux on the VLSMs are discussed as well. It is found that the length scale o
 f the VLSMs has Reynolds number invariance\, and evidenced that the VLSMs 
 in the atmospheric surface layer evolute with a top-down mechanism. In the
  sand-laden flow\, the energy of the VLSMs increases\, while their energy 
 fraction decreases. The inclination angle of the VLSMs increases with the 
 increase of dust concentration. It is revealed that the VLSMs dominates th
 e streamwise transport of PM10 (tiny particles with size less than 10 μm)
 \, but suppress the vertical transport of PM10 near the surface. Finally\,
  it is demonstrated that the temperature and PM10 in the atmospheric surfa
 ce layer have large structural feature similar as the VLSMs\, though the s
 hape of temperature and PM10 structures are different with the VLSMs.
LOCATION:GKB100  Fluid Mechanics Webinar Series via Zoom
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