1 / 12

Frictional EPV changes in the November 2005 TPV

Frictional EPV changes in the November 2005 TPV. Steven Cavallo. Hakim group meeting November 9, 2006. Obligatory big picture slide. Examining the mechanisms that cause tropopause polar vortices (TPVs) to strengthen and decay

tosca
Download Presentation

Frictional EPV changes in the November 2005 TPV

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Frictional EPV changes in the November 2005 TPV Steven Cavallo Hakim group meeting November 9, 2006 Hakim group meeting

  2. Obligatory big picture slide • Examining the mechanisms that cause tropopause polar vortices (TPVs) to strengthen and decay • Ertel’s theorem says only diabatic and frictional processes can do so • Analysis of diabatic term shows that cloud-top radiational cooling can significantly contribute to cyclone strengthening but weakening processes still unclear and will be examined in the future • Quantitative results rely on PV budget closing; Overall residual high, diabatic portion small; Friction? Better resolution? Hakim group meeting

  3. Outline • How does friction get into Ertel PV (EPV)? • WRF and the momentum equations • Vertical frictional profiles, residuals, and time-height plots • Future strategies Hakim group meeting

  4. Hakim group meeting

  5. Hakim group meeting

  6. Hakim group meeting

  7. Hakim group meeting

  8. Hakim group meeting

  9. Hakim group meeting

  10. What next? • Try even order advection and differencing schemes. This eliminates model diffusion. In preliminary runs, model crashes often and easily. • Increase horizontal resolution • Nesting • Residual calculation on nested domain. Tricky Task! Hakim group meeting

  11. WRF nested small time step output procedure Hakim group meeting

  12. WRF nested small time step output procedure Regular nested run Small time step output and on nest and residual calculation Hakim group meeting

More Related