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UID:20260926T210815EDT-90580ge6nv@132.216.98.100
DTSTAMP:20260927T010815Z
DESCRIPTION: \n\nStudent Seminar Series\n\nDepartment of Atmospheric & Ocea
 nic Sciences\n\npresents\n\na talk by\n\nTing-Chen Chen\n	PhD student\n\nDy
 namics of slantwise convection and sensitivities to model grid spacing und
 er idealized frameworks\n\nSlantwise convection has been identified as one
  of the mechanisms for banded precipitation in baroclinic environments in 
 many case studies. Our recent climatological analysis\, based on ECMWF rea
 nalysis data\, also revealed the potential importance of slantwise convect
 ion in the intensification of midlatitude cyclones. Although a typical sla
 ntwise convective band has a width of several tens to about a hundred kilo
 meters in the cross-band direction\, the embedded smaller-scale processes 
 might meaningfully regulate its evolution. In global/climate models with a
  typical horizontal grid spacing of O(10-100 km)\, convection is typically
  modeled by a cumulus parameterization scheme which does not consider slan
 twise ascent. It is therefore unclear whether mesoscale slantwise convecti
 on can be adequately resolved in these models. To address this issue\, a s
 eries of idealized experiments of slantwise convection are performed using
  the two-dimensional\, non-hydrostatic Weather Research and Forecasting Mo
 del\, with the horizontal grid lengths varying between 1 to 40 km. The res
 ults show that the general features of the slantwise band and its larger-s
 cale feedbacks converge numerically when the cross-band grid length ∆y=5 k
 m is reached. By applying an accurate inline budget retrieval method to an
 alyze the model output\, we uncover new aspects of the slantwise convectiv
 e dynamics and show that the non-hydrostatic pressure-perturbation field p
 lays a significant role in the evolution of the cloud band. Such perturbat
 ions can only be adequately resolved with grid lengths of 5 km or less. Th
 us\, important characteristics of slantwise convection may be poorly resol
 ved in most operational numerical weather prediction and climate models an
 d a slantwise convective parameterization would need to be implemented.\n
 \nWednesday Feb 12/ 2.30 PM/ Room 934 Burnside Hall\n\n \n
DTSTART:20200212T193000Z
DTEND:20200212T203000Z
LOCATION:Room 934\, Burnside Hall\, CA\, QC\, Montreal\, H3A 0B9\, 805 rue 
 Sherbrooke Ouest
SUMMARY:Dynamics of slantwise convection and sensitivities to model grid sp
 acing under idealized frameworks
URL:https://www.mcgill.ca/meteo/channels/event/dynamics-slantwise-convectio
 n-and-sensitivities-model-grid-spacing-under-idealized-frameworks-319802
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