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longitude dependence of solar time #3

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eclare108213 opened this issue May 31, 2017 · 5 comments
Closed

longitude dependence of solar time #3

eclare108213 opened this issue May 31, 2017 · 5 comments
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@eclare108213 @dabail10 @rgrumbine
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Forcing Priority: Medium Testing
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CICE v6.0.1 CICE v6.0.2

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@eclare108213
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From: Pedro Duarte Pedro.Duarte@npolar.no
Sent: Monday, May 22, 2017 8:13 AM

I have just noticed that in ice_forcing.F90, in the subroutine compute_shortwave there is the following equation to calculate solar time:
solar_time = mod(real(sec,kind=dbl_kind),secday)/c3600 &
+ c12sin(p5TLON(i,j))

As I understand, the second term is to correct solar time as a function of longitude. However, I think there may be an error here since c12sin(p5TLON(i,j)) should return 6 hours when TLON = 90 and it returns ~8.5 hours. I wonder why not using a simple linear function here since solar time varies one hour per 15 degrees? Or am I missing something here?
@dabail10
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dabail10 commented Jun 1, 2017

Just a thought here. This was used for the AOMIP protocol and I believe there are some corrections for the eccentricity of the Earth's orbit. There is an interesting page here:

http://www.pveducation.org/pvcdrom/2-properties-sunlight/solar-time

This formula gives GMT+12 precisely at 180 degrees. Elizabeth, do you recall discussions about this during AOMIP?

Dave

@eclare108213
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@dabail10 I do not recall conversations about this during AOMIP -- I pretty much just took the documentation that was given and coded it up. If this formula is technically correct, why would it be returning the wrong value when TLON=90?

@dabail10
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You can assign this issue to me. I can't assign it to myself.

@eclare108213
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It seems like you ought to be able to claim it yourself if you wanted to do it...
@apcraig Do we need to have permissions set differently, or is this standard github procedure?

@eclare108213 eclare108213 self-assigned this Mar 10, 2018
eclare108213 pushed a commit that referenced this issue Mar 31, 2018
@anders-dc
Merge pull request #3 from apcraig/travis
b871231 
update travis suite and add quiet mode to scripts
apcraig referenced this issue in apcraig/CICE Sep 24, 2018
@apcraig
mods for nag compiler failure (#3)
975e4b2
apcraig referenced this issue in apcraig/CICE Sep 24, 2018
@apcraig @mhrib
mods for nag compiler failure (#3)
2e6e351
apcraig referenced this issue in apcraig/CICE Sep 27, 2018
@apcraig
mods for nag compiler failure (#3)
260b3ef
apcraig pushed a commit that referenced this issue Sep 28, 2018
@mhrib @apcraig
Alloc dyn4 (#194)
8492af9 
* Allocatable dynamics version using namelist

* Updated ice_in according to "Allocated Dynamics"

* update scripts to automatically set namelist associated with grids and blocks

* fix uarea initialization related to NYGLOB cpp (#1)

* update pgi optimzation to address reproducibility problems (#2)

* mods for nag compiler failure (#3)

* Update to Consortium master bbec5d1 (#4)

* update pgi compiler optimization to address reproducibility problems

* Dummy and unused variables. (#180)

* Remove some dummy arguments and unused variables.

* Dummy variable cleanup

* Cleanup

* Remove icepack from commit

* Reset icepack master

* Fix

* Fix

* Update icepack

* fix

* Fix flush ifdef logic

* Uninitialized variables.

* Additional initialization

* Update dummy

* more dummy fixes

* More hobart changes

* Update Hobart Intel settings

* Additional Hobart Intel changes

* Update icepack

* Some tweaks to dummy variables

* Remove some initialization code.

* Only remove istat checks in one routine.

* update icepack (#188)

* fix ice_abort error in ice_state.F90 (#5)
@apcraig apcraig mentioned this issue Oct 23, 2018
Merged
@eclare108213 eclare108213 added this to To do in CICE v6.0.1 Jun 5, 2019
@dabail10 dabail10 mentioned this issue Jun 13, 2019
Merged
@eclare108213 eclare108213 moved this from To do to In progress in CICE v6.0.1 Jun 13, 2019
@eclare108213 eclare108213 added this to In progress in CICE v6.0.2 Aug 2, 2019
eclare108213 pushed a commit that referenced this issue Aug 30, 2019
@dabail10 @eclare108213
Local Solar Time Computation (#323)
804b703 
* Fix local solar time

* Add line for going past 24

* New LST calculation

Addresses #3.
@eclare108213 eclare108213 moved this from In progress to Done in CICE v6.0.2 Aug 30, 2019
@phil-blain
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I think this can be closed as it was fixed in #323.

CICE v6.0.1 automation moved this from In progress to Done Dec 9, 2019
JFLemieux73 pushed a commit to JFLemieux73/CICE that referenced this issue Nov 16, 2021
@phil-blain
ice_dyn_shared: add 'viscous_coeffs_and_rep_pressure_T' subroutine (C…
50d67f8 
…ICE-Consortium#3)

Add a subroutine mimicking what 'viscous_coeffs_and_rep_pressure' does,
but at a single location.

Name it '*_T' since it's going to be used to compute the viscous
coefficients and replacement pressure at the T point.
anton-seaice pushed a commit to anton-seaice/CICE that referenced this issue Dec 1, 2023
@DeniseWorthen
Merge pull request CICE-Consortium#3 from CICE-Consortium/master
71d2ded
anton-seaice pushed a commit to anton-seaice/CICE that referenced this issue Dec 1, 2023
@dabail10
Merge pull request CICE-Consortium#3 from mvertens/mvertens/nuopc
7e43703 
changes to satisfy ufsatm and cesm requirements for pot temp and density from atm
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@eclare108213 eclare108213

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@eclare108213 @dabail10 @rgrumbine @phil-blain