Ocean Modeling Discussion

ROMS/TOMS

Search for:
It is currently Wed Feb 21, 2018 10:52 pm




Post new topic Reply to topic  [ 2 posts ] 

All times are UTC

Author Message
PostPosted: Sat May 17, 2014 12:21 am 
Offline

Joined: Fri Nov 27, 2009 2:53 pm
Posts: 5
Location: Scripps Institution of Oceanography - UCSD
Dear all,

I am having troubles trying to understand why my nitrate_vertical_advection field (NO3_vadv) is different from my nitrate_multiplied_by_vertical_velocity field (w*NO3, w is true vertical velocity - not Omega), to within a constant.
I mean I should have similar trend, right? However, I do observe regions with complete different behavior (see figure attached). I guess I am missing something but I can't figure out what.
Any suggestion?

For information:
My NO3_vadv is computed online by ROMS, saved every 1 day.
My w*NO3 is computed offline, with w and NO3 saved every 1 day.

Thanks

Fanny


Attachments:
Capture d’écran 2014-05-16 à 4.59.50 PM.png
Capture d’écran 2014-05-16 à 4.59.50 PM.png [ 51.18 KiB | Viewed 1967 times ]
Top
 Profile  
Reply with quote  
PostPosted: Thu May 22, 2014 9:55 pm 
Offline

Joined: Mon Jun 30, 2003 5:29 pm
Posts: 26
Location: UC Santa Cruz
Hi Fanny.

For a tracer, C, the vertical advection term in the tracer equation is wdC/dz or in flux-conservative form d(wC)/dz. It is the flux divergence that causes changes to a tracer value in a cell, not the flux across any cell boundary alone.

ROMS is written in a flux conservative form and I think it's calculating this quantity in s-space (i.e., d(omega C)/ds), but a calculation of d(wC)/dz using fields stored in the avg files should be much closer than wC.

Chris


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group