Remaining Vortex when Using TC Bogus

[kprince]

Hello,

I have successfully performed TC bogusing in which I have removed the initial TC and then ran the WRF model successfully.

My issue however is that after removing the initially strong TC a remnant vortex seemingly still remains as you can see from the image below...



The vortex that I removed over Cuba has been weakened significantly, however it still remains.

The $tc part of my namelist looks like this..

# &tc
# insert_bogus_storm = .false.
# remove_storm = .true.
# latc_loc = 23.1
# lonc_loc = -80.2
# vmax_meters_per_second = 48.9
# rmax = 120000.0
# vmax_ratio = 0.85
# /

and I have tried varying the rmax, however there are no changes that occur to the remaining vortex.

My question is how do I completely remove the TC and not leave a weak vortex in its place? Is this possible utilizing the TC bogusing and if so how do I go about ensuring the original TC is fully removed.

Thank you for any help on this.

 

[Ming Chen]

Have you tried to reduce the value of vmax_meters_per_second? Please let me know whether it works.

 

[kprince]

In this example I will only be removing a vortex and not replacing it with a bogus one, so the vmax should not matter in this case. I have tried setting the vmax to zero however the remnant weak vortex remains.

A working hypothesis on what is going on is that even at quarter degree resolution there are small-scale features which are not fully removed in the bogusing, thus allowing some remnant vorticity to remain and be enough to generate a weak wind field. I have done this same bogusing on 1 degree data and the bogusing process has much more efficiently removed the TC.

 

[Liliputian_123]

Hi,

Were you able to resolve this issue?

I am also experiencing a similar problem!
The tc bogus in wrf cant completely remove the tc!