Runoff Diagnostics

[olyson]

@dlawren asked if we could (relatively quickly) develop a tool to look at runoff and runoff components regionally and monthly/seasonally. Purpose is to identify problematic behavior that may contribute to the Lab Sea freeze problem.

[olyson]

I can work on this when I'm back in the office on Tuesday, but wondering if we are looking for something like a script that produces the plot below but is flexible such that different regions (even individual gridcells) and simulations can be easily selected in the script.
Additional runoff-related variables that may be of interest besides the ones shown here are:

QSNOCPLIQ:long_name = "excess liquid h2o due to snow capping not including correction for land use change", units = "mm H2O/s"
QSNOFRZ:long_name = "column-integrated snow freezing rate", units = "kg/m2/s"
QSNOMELT:long_name = "snow melt rate", units = "mm/s"
QSNWCPICE:long_name = "excess solid h2o due to snow capping not including correction for land use change", units = "mm H2O/s"

[dlawrenncar]

Yes, I think a script that allows us to evaluate a few different regions easily would be helpful. And yes, those are the types of fields I think we would want to see. Can you break precipitation down into rain/snow? Adding those additional fields would be good. And, albedo.

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On Thu, Apr 3, 2025 at 4:33 PM Keith Oleson ***@***.***> wrote: I can work on this when I'm back in the office on Tuesday, but wondering if we are looking for something like a script that produces the plot below but is flexible such that different regions (even individual gridcells) and simulations can be easily selected in the script. Additional runoff-related variables that may be of interest besides the ones shown here are: QSNOCPLIQ:long_name = "excess liquid h2o due to snow capping not including correction for land use change" QSNOFRZ:long_name = "column-integrated snow freezing rate" QSNOMELT:long_name = "snow melt rate" QSNWCPICE:long_name = "excess solid h2o due to snow capping not including correction for land use change" canadian_arctic.png (view on web) <https://github.com/user-attachments/assets/1241bcf6-69c3-4106-a487-9ed742c3353c> — Reply to this email directly, view it on GitHub <#94 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFABYVGNPLEQ33NAEHDRAQ32XWZL3AVCNFSM6AAAAAB2NKGCP6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENZRHEZTQMA> . You are receiving this because you are subscribed to this thread.Message ID: ***@***.***>

[olyson]

I have a script that produces plots similar to above, including rain/snow/albedo and the other fields for various regions. Not sure the best place to share this right now, but here are some sample results:

https://docs.google.com/presentation/d/1L2HsGVlRD1Rt-6iuQGPivwERuM9w0P2a/edit?usp=sharing&ouid=104026900087612515425&rtpof=true&sd=true

This is comparing 152 (which reverted to CLM5 snow but froze right away) and 140 (which also froze a bit later). Climatologies for years 5-24.
First slide is Canadian Arctic near the Lab Sea, second is Greenland near the Lab Sea. Last slide is standard Canadian Arctic as defined in the diagnostics package.
Lots of things to look at here, but in general I don't see any snow capping runoff in the Canadian Arctic region (QSNOCPLIQ and QSNWCPICE) in either simulation, 152 is much colder in summer with higher albedo, somewhat lower and delayed melt and runoff, and less rain and more snow. This is consistent with the fact that we had changed snow parameters (as used in 140 for example) to lower albedo, increase melt, etc., to improve vegetation viability. One can see similar things for the Greenland side of the Lab Sea. There is some snow capping ice runoff there, particularly in the 152 simulation.
The standard diagnostics show that 152 trends cold right away:

https://webext.cgd.ucar.edu/BLT1850/b.e30_alpha06b.B1850C_LTso.ne30_t232_wgx3.152/lnd/b.e30_alpha06b.B1850C_LTso.ne30_t232_wgx3.152_5_24-b.e30_alpha06b.B1850C_LTso.ne30_t232_wgx3.140_5_24/set1/set1_TSA.gif

Anyway, we can discuss whether these plots are useful and what kind of tweaking they need...

[olyson]

I've expanded the regions a bit as discussed. Slides 3 and 4.

[dlawrenncar]

Which presentation again? I clicked on the link previously in the thread and am seeing the same plots I believe.

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On Tue, Apr 8, 2025 at 1:10 PM Keith Oleson ***@***.***> wrote: I've expanded the regions a bit as discussed. Slides 3 and 4. — Reply to this email directly, view it on GitHub <#94 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AFABYVHQE3EHABKIUHUCNLL2YQNKLAVCNFSM6AAAAAB2NKGCP6VHI2DSMVQWIX3LMV43URDJONRXK43TNFXW4Q3PNVWWK3TUHMYTENZWHEYTOMY> . You are receiving this because you commented.Message ID: ***@***.***>

[olyson]

Sorry, I guess if I update the ppt outside of my google drive and then upload it, I need to provide a new link:

https://docs.google.com/presentation/d/1i_PAgvKVR26IWCfhcml707liugMKh3eo/edit?usp=drive_link&ouid=104026900087612515425&rtpof=true&sd=true