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A few sea ice related issues in the NSST analysis #18

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XuLi-NOAA opened this issue Sep 18, 2019 · 4 comments
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A few sea ice related issues in the NSST analysis #18

XuLi-NOAA opened this issue Sep 18, 2019 · 4 comments

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@XuLi-NOAA
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XuLi-NOAA commented Sep 18, 2019 •
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In the current NSST foundation temperature (Tf) analysis, a few sea ice related issues need to be resolved:

  1. Tf analysis for the water-ice mixed grids (ice concentration > 15%)

  2. The Tf evolution in prediction mode due to two SST climatology updates: (1) Seasonal tendency; (2) Relaxation to climatology

In this ticket,

  1. The Tf analysis for the grids with sea ice will be done in the stand-a-lone global_cycle step through a salinity dependent formula.
  2. The assigned value (currently, the frozen point, 271.2 K) will be re-visited, including the use of the SST climatology to help.
  3. Apply the two SST climatology updates to Tf for the grids with sea ice fraction
@XuLi-NOAA XuLi-NOAA mentioned this issue Sep 30, 2019
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@XuLi-NOAA
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The item 3, Apply the two SST climatology updates to Tf for the grids with sea ice fraction, is not included in this review (will be done in the future).

  1. The code change:

global_cycle.fd/cycle.f90
flobal_cycle.fd/read_write_data.f90

  1. The scripts change:

ush/global_cycle.sh

  1. Addition of a fix file (global_salclm.t1534.3072.1536.nc) to FIXam directory in global workflow

@SMoorthi-emc
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Xu, I hope you are not hardwiring the minimum sea ice concentration. In the GFS now we have namelist variables "min_seaice" and "min_lakeice". While standalone GFS currently uses a value of 0.15 for both, in the coupled model I am using 1.0e-6 for min_seaice and 0.15 for min_lakeice.
Moorthi

@XuLi-NOAA
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XuLi-NOAA commented Oct 3, 2019 via email

GeorgeGayno-NOAA pushed a commit that referenced this issue Oct 11, 2019
@XuLi-NOAA @GeorgeGayno-NOAA
A few sea ice related issues in the NSST analysis: Issue #18 (#20)
1b76994 
develop:  This commit references issue #18.

Updates to global_cycle:  Tf analysis for the grids with sea ice done using a salinity dependent formula (instead of using 271.2 K).   Update sfcsub.F to the latest version used by the forecast model (includes elimination of masked interpolation for substrate temperature and some updates to Fortran 90 standards).  The global_cycle.sh script was updated to reference a new global salinity dataset.

Updates to global_chgres - Update sfcsub.F to use same version as global_cycle.
This was referenced Oct 14, 2019
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@GeorgeGayno-NOAA
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Work complete. Closing issue.

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@SMoorthi-emc @GeorgeGayno-NOAA @XuLi-NOAA