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SUMMARY:The orthogonal curvilinear terrain-following coordinate for atmosp
 heric models - Yiyuan Li\,   (Chinese Academy of Sciences)
DTSTART:20120926T080000Z
DTEND:20120926T082500Z
UID:TALK40146@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:This study designs a novel terrain-following coordinate\, call
 ed the Orthogonal curvilinear terrain-following coordinate (Orthogonal sig
 ma coordinate\, OS-coordinate)\, which has the ability to handle both the 
 well-known high level errors and the pressure gradient force (PGF) errors 
 above the steep terrain in the classic terrain-following coordinate (sigma
 -coordinate). \n\nThe OS-coordinate is proposed through a way quite differ
 ent from and against the sigma-coordinate. The basis vectors of OS-coordin
 ate which is unit and terrain-following are firstly designed\, and then th
 e corresponding definitions of every coordinates are solved\, so that the 
 scalar equations of OS-coordinate are solved. The PGF computational form h
 as only one term in each momentum equation of OS-coordinate\, thereby avoi
 ding the PGF problem completely. \n\nFinally\, a unified framework is prop
 osed to combine the equations of the Cartesian coordinate\, sigma-coordina
 te and OS-coordinate together via an on-off\, and is used to implement ide
 alized advection experiments for testing the OS-coordinate. The evaluation
  on the experimental results show the vertical coordinate surfaces in the 
 OS-coordinate can be much smoother than those in the sigma-coordinate\, an
 d therefore the OS-coordinate outperforms all along the sigma-coordinate. 
 This new coordinate can be used for oceanic models as well\, and needs to 
 be tested in both the idealized and real-case experiments. \n\n
LOCATION:Seminar Room 1\, Newton Institute
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