1 / 2

Jet Entrance Region * frontogenetic (isotherms should follow streamlines/ hgts )

Jet Entrance Region * frontogenetic (isotherms should follow streamlines/ hgts ) *geostrophic forcing reduces the wind shear, i.e., where, Q 2 is in –j direction (<0), i.e.,. f rom notes. 0. >0 <0. Note that red boxes represent the ‘matching’ deformation patterns in the two figs.

gada
Download Presentation

Jet Entrance Region * frontogenetic (isotherms should follow streamlines/ hgts )

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. Jet Entrance Region *frontogenetic (isotherms should follow streamlines/hgts) *geostrophic forcing reduces the wind shear, i.e., where, Q2 is in –j direction (<0), i.e., from notes 0 >0 <0 Note that red boxes represent the ‘matching’ deformation patterns in the two figs.

  2. Jet Entrance Region Cont’d From purely geo. forcing Note that for purely geostrophic forcing, the vertical shear would decrease in time (for jet entrance). Yet from previous slide – we can clearly see that the entrance region is frontogenetic (i.e., the temperature gradient is increasing!). From the thermal wind relation, i.e., This is inconsistent (i.e., an increasing temperature gradient should be associated with increasing vertical shear!)!!! TAKE HOME: The QG system ‘responds’ to the geostrophic forcing (i.e., temperature advection by the geostrophic wind). The ‘response’ is the vertical motion (i.e., divergence/convergence) – and is exactly what is needed to maintain thermal wind balance. Hence, in the entrance region this would be rising (sinking) motion in the warm (cold) regions of the jet streak. Note that rising (sinking) motion is associated with adiabatic cooling (warming) via the QGTE Which term is relevant?????

More Related