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- Title
Performance of offline passive tracer advection in ROMS (v3.6, revision 904).
- Authors
Thyng, Kristen M.; Kobashi, Daijiro; Ruiz-Xomchuk, Veronica; Qu, Lixin; Chen, Xu; Hetland, Robert D.
- Abstract
Offline advection schemes allow for low computational cost simulations using existing model output. This study presents the approach and assessment for passive offline tracer advection within the Regional Ocean Modeling System (ROMS). An advantage of running the code within ROMS itself is consistency in the numerics on and offline. We find that the offline tracer model is robust: after about 14 days of simulation (almost 60 advection timescales), the skill score comparing offline output to the online simulation using the TS_U3HADVECTION and TS_C4VADVECTION (3rd-order upstream horizontal advection and 4th-order centered vertical advection) tracer advection schemes is 99.6 % accurate for an offline time step 20 times larger than online, and online output saved with a period below the advection timescale. For tracer advection scheme MPDATA, accuracy is more variable with offline time step and forcing input frequency choices, but is still over 99 % for many reasonable choices. Both schemes are conservative. Important factors for maintaining high offline accuracy are: outputting from the online simulation often enough to resolve the advection timescale, forcing offline using realistic vertical salinity diffusivity values from the online simulation, and using double precision to save results.
- Subjects
ADVECTION; REVISIONS; SALINITY; OCEAN; PERFORMANCES
- Publication
Geoscientific Model Development Discussions, 2020, p1
- ISSN
1991-9611
- Publication type
Article
- DOI
10.5194/gmd-2020-221