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#1529 (Tracer conservation and bbl) – NEMO

Opened 9 years ago

Closed 7 years ago

#1529 closed Defect (fixed)

Tracer conservation and bbl

Reported by: jchanut Owned by: nemo
Priority: low Milestone:
Component: OCE Version: trunk
Severity: Keywords: BBL conservation tracer


The global budget of any tracer should be closed in NEMO provided key_vvl is activated (and with Asselin filtering or not, forcing or not, cf Leclair and Madec, 2009). Although not related to this ticket, we expect this is to be true as long as one sticks with a leapfrog time stepping for the free surface (ie ln_bt_fw=false with key_dynspg_ts. If ln_bt_fw=true, one trades global conservation in favor of constancy preservation).

Testing this for salinity in ORCA2 (without ice model for simplicity), I found that the use of trabbl breaks down this principle.

Commit History (1)


add asselin correction with runoffs (ticket #1529)

Attachments (1)

ORCA2_flt_cons.jpg (153.6 KB) - added by jchanut 9 years ago.

Download all attachments as: .zip

Change History (5)

Changed 9 years ago by jchanut

comment:1 Changed 9 years ago by jchanut

Here is a plot to illustrate the non conservation issues found with key_dynspg_flt in ORCA2. I have added a test with or without ln_rnf relative to the last comment made in ticket #1540. Perfect conservation is indeed achieved without the diffusive bbl and runoffs. Fixes to come soon.

comment:3 Changed 8 years ago by nicolasmartin

  • Keywords BBL added; bbl removed

comment:4 Changed 7 years ago by gm

  • Resolution set to fixed
  • Status changed from new to closed

solved by Andrew Coward, see ticket #1932


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