Opened 5 years ago

Closed 5 years ago

#1631 closed help (answered)

Doughnut shape feature

Reported by: ggxmy Owned by: um_support
Component: UM Model Keywords: doughnut strange feature
Cc: Platform: ARCHER
UM Version: 8.4


Dear CMS,

I feel strange about the feature I found in several output diagnostics from my simulations using UM vn8.4 UKCA CheST GLOMAP-mode. This job descended from RJ4.0 but includes nudged double call settings and many other modifications.

The feature is doughnut shaped centred at N of Caspian Sea and has a size of a few grids. This can be seen in many cloud diagnostics and also in theta at and near the surface. This feature can be seen in monthly outputs from May to August of 2008. Please see the attachment.

Please note that since this is a double call job, the aerosols do not feedback on the meteorology almost at all.

Does anybody have any idea what this is and why it is present?


Attachments (1)

Theta@sfc_fcloud_tdyraa.pm2008jun.jpg (92.5 KB) - added by ggxmy 5 years ago.

Download all attachments as: .zip

Change History (5)

Changed 5 years ago by ggxmy

comment:1 Changed 5 years ago by grenville


Please tell me where the leave file is for tdyraa.


comment:2 Changed 5 years ago by ggxmy

HI Grenville,

tdyra is one of the jobs in an ensemble. .leave files for that run are


in /home/n02/n02/masara/output/ .

Outputs are stored in /work/n02/n02/masara/Dumps/tdyra/ .

Or maybe it's easier to check the base job tdyon because it was run by itself. tdyon has the same feature. In that case, .leave files are


in the same directory. Outputs are stored in /work/n02/n02/masara/Dumps/tdyon/ .


comment:3 Changed 5 years ago by simon


There appears to be issues with your SSTs/seaice (unless you're simulating an ice age). Have a look at /work/n02/n02/masara/ancils/qrclim.sst and qrclim.seaice The ice extends to the mid-latitudes and also it isn't masked correctly. The doughnut is a result of a single point of warm sst surrounded by points at 273K.


comment:4 Changed 5 years ago by annette

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