[MITgcm-support] EXF configuration

[Martin Losch]

So both latidute and longitude intervals are constant? I didn’t get that. In that case you need to set

 precip_lon_inc     = 0.25D0, # as you did
and 
 precip_lat_inc     = 719*0.25D0, # this assumes that there are 720 grid point in latitude direction so that you have 719 intervals. *_lat_inc expects the “correct” number of intervals.

As far as I can see from the data.exf file, you are already doing this right, except for precipitation.

Martin

> On 1. Sep 2023, at 10:06, Haoran Xu <xu1jian2wei3 at 163.com> wrote:
> 
> Thanks for your reply again Martin.
> Sorry. I am confused because the latitude intervals of the ERA5 data are constant.So are the latitude from ERA5 or other data？I don't really understand.
> 
> 
> ---- 回复的原邮件 ----
> 发件人	Martin Losch<Martin.Losch at awi.de> <mailto:Martin.Losch at awi.de>
> 日期	2023年09月01日 15:46
> 收件人	MITgcm Support<mitgcm-support at mitgcm.org> <mailto:mitgcm-support at mitgcm.org>
> 主题	Re: [MITgcm-support] EXF configuration
> 
> dlat(1) = lat(2) - lat(1), etc.?
> 
>> On 1. Sep 2023, at 09:43, Haoran Xu <xu1jian2wei3 at 163.com <mailto:xu1jian2wei3 at 163.com>> wrote:
>> 
>> Thanks Martin.May I ask in detail how to calculate the intervals?
>> 
>> 
>> 
>> ---- 回复的原邮件 ----
>> 发件人	Martin Losch<Martin.Losch at awi.de> <mailto:Martin.Losch at awi.de>
>> 日期	2023年09月01日 15:26
>> 收件人	MITgcm Support<mitgcm-support at mitgcm.org> <mailto:mitgcm-support at mitgcm.org>
>> 主题	Re: [MITgcm-support] EXF configuration
>> Haoran,
>> 
>> you can specify non-constant latitude intervals like this:
>> 
>>  precip_lat_inc    = 0.556914D0, 0.560202D0, 0.560946D0, 0.561227D0, 0.561363D0,
>>                      0.561440D0, 0.561487D0, 0.561518D0, 0.561539D0, 0.561554D0,
>>                      0.561566D0, 0.561575D0, 0.561582D0, 0.561587D0, 0.561592D0,
>>                      289*0.561619268965519,
>>                      0.561592D0, 0.561587D0, 0.561582D0, 0.561575D0, 0.561566D0,
>>                      0.561554D0, 0.561539D0, 0.561518D0, 0.561487D0, 0.561440D0,
>>                      0.561363D0, 0.561227D0, 0.560946D0, 0.560202D0, 0.556914D0,
>> 
>> Note that this is *not* correct for Era5 with 0.25 deg grid spacing, just to illustrate how to do this, and you’ll have to figure out the intervals yourself. With very large forcing data sets you may have to increase some constants in EXF_INTERP_SIZE.h
>> 
>> Martin
>> 
>>> On 1. Sep 2023, at 08:55, Haoran Xu <xu1jian2wei3 at 163.com <mailto:xu1jian2wei3 at 163.com>> wrote:
>>> 
>>> Dear MITgcm community,
>>> 
>>>    I am simulating South China Sea current using the configuration in https://data.nas.nasa.gov/ecco/data.php?dir=/eccodata/llc_4320/regions/SouthChinaSea3 Simulating the current in South China Sea  And I am using ERA5 data (0.25°)as atmospheric forcing. The Latitude interval (for 0.14°) in data.exf is not equally spaced distributed. I have not found the configuration for resolution 0.25°(https://github.com/MITgcm-contrib/llc_hires ). So I set the latitude interval equally spaced(file attached).I want to know if this configuration right. Or can anybody teach me how to set this(for 0.25)? Thanks in advance.
>>> 
>>> Best regards,
>>> 
>>> Haoran
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