Grounded berg in SIS2_bergs_cgrid #45
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Hallberg-NOAA
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Sep 5, 2014
Corrected bugs in which the u-stress was used in place of the v-stress in the ice_bergs code with C-grid wind stresses. This changes answers in the SIS2_bergs_cgrid test case, and new reference solutions have been checked in. This closes #45 . This corresponds to NOAA-GFDL/SIS2@96a9a0b .
nikizadehgfdl
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Oct 9, 2017
- Issue mom-ocean#45 pointed out that we had a bad runoff data set in our OM4 configuration: we should not interpolate runoff at runtime. Moreover, the file we are interpolating from is a 1-degree tri-polar grid but is treated as lat-lon data by data_override. - This commit adds a preprocessing step that uses the runoff_regrid tool, following instructions sent by @amylangenhorst. - I have yet to actually test it in the model.
nikizadehgfdl
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Oct 9, 2017
- As pointed out in issue mom-ocean#45, the runoff file in OM4_025 was somewhat bogus. - Commit 7859155 the preprocessing steps to generate a 12 month climatology of runoff using fre-nctools, documented in the preprocessing directory. - This commit only makes the file available but does not transition the default configuration to use it since I'd rather verify that the model runs stably before doing so. - Closes mom-ocean#45. - No answer changes (yet).
nikizadehgfdl
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Oct 9, 2017
- In order to make progress on the issue mom-ocean#45 and make commit 7859155 I added copies of make_coupler_mosaic.c and make_quick_mosaic.c to the preprocessing directory. Those files were subsequently found by path_names in the XML which caused compilation issues. - Fortunately @Zhi-Liang has added the necessary patches to a branch which I am now cloning so we can do away with the local copies.
SMoorthi-emc
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Dec 23, 2020
…L-20201215 Feature/update to gfdl 20201215
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@nikizadehgfdl reported:
I have confirmed that the model crashes for the same reason at around this time using our interactive testing.
I also noticed two messages from the icebergs that are hidden when "verbose=.false.":
bad lon: 218 4 210diamonds: net mass budget: recvd in= 4.5154404E+11 kg, rtrnd out= 2.2024064E+09 kg, Delta net mass= 4.4934164E+11 kg, error=-5.148E-01 ndThe first means there are inconsistent grid data in, or on the edge of, the halo region. The second means there is a 50% error between in the mass budget as seen by SIS2 through modification of the calving field. For the corresponding SIS2_icebergs experiment (B-grid), this error is of order 1e-12. I speculate that we have a grid staggering issue somewhere! :)
Finally, the original grounded berg error indicated zero ice and ocean velocities but non-zero atmospheric winds. This event might be triggered by a new "situation" in which the C-grid ice-model permits non-zero winds on coast-lines. The bergs are meant to collide with the coast-line before landing inside a land cell so I'm not sure how this alone would lead to the above error.
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