Matt Long (Feb 26 2020 at 22:27): Matt Long (Feb 26 2020 at 22:27):Question for @Stephen Yeager:
We are thinking of initializing BGC tracers from a 1° spin-up integration, but are wary of the deep ocean drift.
Is there a 1° configuration you guys tested with JRA that might be better than the default settings?
Stephen Yeager (Feb 26 2020 at 22:50):Matt, We need to ask Who about this because I'm not sure my memory is accurate. I think we were able to reduce deep drift (in a JRA G-case) by reverting to old isopycnal mixing values, but doing so led to weak AMOC. We could not get both drift & AMOC behaving well at the same time.
Matt Long (Feb 28 2020 at 17:09):@Who Kim, can you let us know what you think? I think our desire is to be as similar to the hi-res circulation at large-scales as possible.
Who Kim (Feb 28 2020 at 19:04):@Matthew Long , @Stephen Yeager , AMOC strength change was very small when the deep isopycnal mixing was reverted to the old value (compared green and red lines in the first attached plot), while global temperature drifted much less with the old value (compare red and green lines in the second attached plot).
Screen-Shot-2020-02-28-at-11.57.07-AM.png
Screen-Shot-2020-02-28-at-12.01.33-PM.png
Matt Long (Feb 29 2020 at 04:13):Thanks Who. From these plots, it looks like the smaller kappa values are the way to go to mitigate drift. Do you know if anyone has computed/plotted MOC from the JRA high res case?
Keith Lindsay (Mar 06 2020 at 16:52):Here's MOC at various latitudes from the JRA high-res case, courtesy of @Stephen Yeager pasted image
The low res JRA runs are lower at 26N than then high res, though they are trending up.
Last updated: May 16 2025 at 17:14 UTC