Add RRTMG cloud overlap option 5#1591
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weiwangncar merged 5 commits intowrf-model:developfrom Dec 17, 2021
weiwangncar:rrtmg_cloud
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Add RRTMG cloud overlap option 5#1591weiwangncar merged 5 commits intowrf-model:developfrom weiwangncar:rrtmg_cloud
weiwangncar merged 5 commits intowrf-model:developfrom
weiwangncar:rrtmg_cloud
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davegill
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Dec 7, 2021
davegill
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Dec 7, 2021
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@weiwangncar |
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@dudhia @smileMchen @weiwangncar Wei, |
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@davegill Will try to get some information from the developers. |
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@weiwangncar |
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@weiwangncar Here are the restart tests (0=pass): Here is the DA builds: |
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@dudhia @weiwangncar @smileMchen |
dudhia
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Dec 15, 2021
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The updated code has passed all Jenkins tests: |
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Jimy, Jimy and Ming, |
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Is cldovrlp = 5 a namelist option? |
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@dudhia Yes, it is. You can use it to set all five options for cloud overlapping. For ARW, the default is 2 from registry. |
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OK, yes, I see now. Could be stated in PR and release notes.
…On Thu, Dec 16, 2021 at 3:40 PM weiwangncar ***@***.***> wrote:
@dudhia <https://github.com/dudhia> Yes, it is. You can use it to set all
five options for cloud overlapping.
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dudhia
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Dec 16, 2021
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@dudhia Release note updated. This namelist isn't introduced in the PR. It's ben in the code since option 4 was added. |
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Yes, not one I knew about before.
…On Thu, Dec 16, 2021 at 3:45 PM weiwangncar ***@***.***> wrote:
@dudhia <https://github.com/dudhia> Release note updated. This namelist
isn't introduced in the PR. It's ben in the code since option 4 was added.
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TYPE: enhancement KEYWORDS: RRTMG, cloud overlap option SOURCE: Mike Iacono, John Henderson, AER DESCRIPTION OF CHANGES: This PR adds a new cloud overlap option for RRTMG, exponential-random (cldovrlp=5). Also added is an optional decorrelation length option - either fixed at 2500 m (idcor=0), or a function of latitude (idcor=1). The decorrelation option works for cloud overlapping option 4 (exponential) too. Tests from one 15 km, east Asian domain in summer, suggests that compared to the default option, maximum-random, this exponential-random produces a slightly cooler atmosphere. For more information, please see this [report](https://dtcenter.org/sites/default/files/visitor-projects/Iacono_Henderson_DTC_VP_FinalReport_2019-2020.pdf). LIST OF MODIFIED FILES: M Registry/Registry.EM_COMMON M dyn_em/module_first_rk_step_part1.F M phys/module_ra_rrtmg_lw.F M phys/module_ra_rrtmg_sw.F M phys/module_radiation_driver.F M run/README.namelist M share/output_wrf.F TESTS CONDUCTED: 1. Tested in a 15 km east Asian domain. 2. The Jenkins tests are all passing. RELEASE NOTE: This PR adds a new cloud overlap option for RRTMG, exponential-random set by namelist cldovrlp=5. A decorrelation length option, idcor, is also added. It is set either fixed at 2500 m (idcor=0), or a function of latitude (idcor=1). The decorrelation option works for cloud overlapping option 4 (exponential) too.
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TYPE: enhancement
KEYWORDS: RRTMG, cloud overlap option
SOURCE: Mike Iacono, John Henderson, AER
DESCRIPTION OF CHANGES:
This PR adds a new cloud overlap option for RRTMG, exponential-random (cldovrlp=5). Also added is an optional decorrelation length option - either fixed at 2500 m (idcor=0), or a function of latitude (idcor=1). The decorrelation option works for cloud overlapping option 4 (exponential) too. Tests from one 15 km, east Asian domain in summer, suggests that compared to the default option, maximum-random, this exponential-random produces a slightly cooler atmosphere, as shown below.
Fig.1 SWDOWN difference at 2 pm local time.
Fig.2 LWDNB difference at 11 pm local time.
Fig. 3. Domain-averaged temp and height differences at 2 pm and 11 pm. The unit for T is K, and m for H.
For more information, please see this report.
LIST OF MODIFIED FILES:
M Registry/Registry.EM_COMMON
M dyn_em/module_first_rk_step_part1.F
M phys/module_ra_rrtmg_lw.F
M phys/module_ra_rrtmg_sw.F
M phys/module_radiation_driver.F
M run/README.namelist
M share/output_wrf.F
TESTS CONDUCTED:
RELEASE NOTE: This PR adds a new cloud overlap option for RRTMG, exponential-random set by namelist cldovrlp=5. A decorrelation length option, idcor, is also added. It is set either fixed at 2500 m (idcor=0), or a function of latitude (idcor=1). The decorrelation option works for cloud overlapping option 4 (exponential) too.