Hello,

I have been noticing an unusual thing in the value of precipitation pr ( regcm4.5) ,
when I set the output for 6 hours: the day sum becomes high compared to when I set 12 hours day sum or 24 hours output. any guidance please .....

Also, Can anyone share with me the documents with all of regcm4 equations ( dynamics equations and physics(schemes) as well).  

Thanks.
Warm  regards 
Bon
Climatologist.

On Wed, 28 Aug 2024 at 13:01, <regcnet-request@lists.ictp.it> wrote:


Today's Topics:

   1. Model grid superimposed on high resolution nest (Alder, Jay)


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From: "Alder, Jay" <jay.alder@oregonstate.edu>
Subject: [RegCNET] Model grid superimposed on high resolution nest

Hello all, I?ve found an issue in RegCM5 when nesting a 10 km simulation (MOLOCH) within a 50 km (MM4 hydrostatic) where there is clearly a grid artifact superimposed on the wind curl field at all atmospheric levels. I am mainly interested in wind stress curl (tauu / tauv) at the surface, but I noticed the stipple pattern is present throughout the atmospheric column. It is a 50 to 10 km nest, so perhaps this is stemming from a SST or surface pressure interpolation in ICBC. I?ve done a 15 km nest previously and don?t recall seeing the pattern, so it is likely scale-dependent. I?ve masked out the land in the attached sample to remove noise from the terrain, but the grid pattern is visible in the U/V curl field at all levels and all times if you set the color scales correctly.

My current project focuses on wind stress changes, where this pattern is prominent throughout my figures, so I hope it can be solved before I submit our manuscript to a journal.

Thank you


[PastedGraphic-1.png]

Jay Alder
Geology, Minerals, Energy, and Geophysics Science Center
U.S. Geological Survey
https://www.usgs.gov/staff-profiles/jay-alder
Oregon State University
104 CEOAS Admin Building
Corvallis, OR 97331

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