[MITgcm-support] Bulk Force and SSS restoring

[Martin Losch]

Hi Holly, Gael,

thanks for the clarifications. There was a time (maybe really long ago), when time dependent forcing with exf did not work, when these parameters were not set in "data". I never went back to check (or even correct) that, so I am glad that this also separated now (as it should). 

Martin

On Feb 24, 2010, at 2:07 AM, gael forget wrote:

> Hi Amato, Martin, et al.
> 
> I concur with Holly's statement.
> 
> I would add that it may be good practice to put all of the forcing
> specifications in data.exf if you use exf -- or in data if you do not
> use exf -- but not half and half. In fact, I made the recent MITgcm
> modification for SST/SSS relaxation because I had tripped several
> times over their specification by means of data+data.exf.
> 
> Cheers,
> Gael
> 
> On Feb 22, 2010, at 10:22 AM, Holly Dail wrote:
> 
>> Martin -
>> 
>> In my experience, when using EXF it is not necessary to set externForcingPeriod or externForcingCycle in the data file.   The data.exf repeatPeriod and field specific periods (e.g. atempperiod) seem sufficient:
>> 
>> &EXF_NML_01
>> exf_albedo        = 0.15,
>> exf_iprec         = 32,
>> exf_yftype        = 'RL',
>> useExfYearlyFields= .FALSE.,
>> twoDigitYear      = .FALSE.,
>> useExfCheckRange  = .FALSE.,
>> repeatPeriod      = 31104000.,
>> &
>> #
>> &EXF_NML_02
>> atempfile         = 'RG_tmp2m06',
>> <snip>
>> #
>> atempstartdate1   = 20010101,
>> atempstartdate2   = 060000,
>> atempperiod       = 21600.0,
>> #
>> <snip>
>> 
>> Holly
>> 
>> On Feb 18, 2010, at Feb 18 , 1:57 AM, Martin Losch wrote:
>> 
>>> Hi Amato,
>>> On Feb 17, 2010, at 8:57 PM, Amato Evan wrote:
>>> 
>>>>> 
>>>>> In exf, you can specify wind (or stress), lwdown, swdown, humidity, surface air temperature, precipitation (and with an additional flag, also evaporation), or net lwflux and net swflux (depends on the CPP-flags, see EXF_OPTIONS.h for more details).
>>>> This is what I am doing (u & v stress, lw down, sw down, air q & temp). I'd like to leave off precip and just restore to SSS since this is how I spun up the model to begin with (using "external fields load").
>>> when you define EXF_READ_EVAP in EXF_OPTIONS.h, you can read both precipitation and evaporation with exf. If you then do not specify input files both fields (precip and evap) will be zero, so no FW flux. with
>>> #define ALLOW_CLIMSSS_RELAXATION
>>> you can read SSS for restoring (the restoring time scale set in data, and not data.exf unfortunately. However, if I interpret the most recent check-ins by Gael correctly, then this has just been changed last night and you can now, after a cvs-update set climsssTauRelax in data.exf, instead of tauSaltClimRelax in data. Thank you, Gael, that was long overdue.
>>> What I don't know: Do I still need to set
>>> externForcingPeriod=2592000.,
>>> externForcingCycle=31104000.,
>>> or to some non-zero value in data to get periodic forcing, even with exf, or has this been fixed, too?)
>>> 
>>> M
>>> 
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>> 
>> 
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