Scheduled Downtime
On Friday 21 April 2023 @ 5pm MT, this website will be down for maintenance and expected to return online the morning of 24 April 2023 at the latest

First frame spike

This post was from a previous version of the WRF&MPAS-A Support Forum. New replies have been disabled and if you have follow up questions related to this post, then please start a new thread from the forum home page.

D

Doofus

New member
Hi WRF people,

So, I am running wrf. Everything runs fine and I don't get any errors.
My problem is that the first frame of my run is all crazy high (for one variable). Then the following two are low.
I am not sure why this happens, any ideas on what could cause this?

All the best
 
I added screen shots for the JAN 2000 case on the WRF website.
As you can see, frame 1 I get a huge spike, then frames 2 and 3 go down (4 and 5 are also down, I didn't add those).

Any ideas what can cause this?
 

Attachments

  • Screenshot from 2018-11-01 10-59-45.png
    Screenshot from 2018-11-01 10-59-45.png
    77.5 KB · Views: 996
  • Screenshot from 2018-11-01 11-00-06.png
    Screenshot from 2018-11-01 11-00-06.png
    67.2 KB · Views: 996
  • Screenshot from 2018-11-01 11-00-24.png
    Screenshot from 2018-11-01 11-00-24.png
    70 KB · Views: 996
At the first several hours of simulation, we expect to see large variation of pressure due to possible inconsistency in the initial field, especially noises caused by imbalances between wind and mass fields.
 
Really?
But in the WRF tutorial case that this is based on (JAN 2000), there isn't one. The P field doesn't have a high variation.
Why do we expect it but it's not in the test case?
 
The noise may occur if large inconsistency exists between initial wind and mass fields. In some cases with better initial field, the noise may not be that significant.
 
You must log in or register to reply here.
Top