Changing the position of the subsolar point

[bethproedrou@gmail_com]

Hello,
I am running a tidally-locked Earth simulation with CESM 1.0.4. I have succeeded in slowing down the planet's rotation and to keep the subsolar point stable to my desired longitude. My problem lies with the latitude. As the simulation runs from January to July, the subsolar point advances from -23 degrees to +23 degrees. I wish to force the subsolar point to stay at -23 degrees.
I tried changing the latitude of the subsolar point (SBSLLAT) in the subsol subroutine, but when I run the simulation, the subsolar point still moves. I know this because the Shortwave clear-sky downward flux is moving in latitude from January to July. It would appear that the latitude of the subsolar point is calculated somewhere else in the code, but I have not managed to find where.

Would you happen to know where else in the code is the subsolar point latitude calculated? Or perhaps what else should I change to get the result I want?

Thank you in advance,
Beth

 

[rakeshtejak@gmail_com]

Hi Beth,I'm performing an experiment in which i would like to change the Earth's rotation (say doubled). I have tried all possible places where the variable sday and omega is present, but couldn't get any positive result. In all of these cases the downwelling solar flux at the top of the atmosphere remain unchanged. It would be great if you could suggest me in this regard.Thank you.Regards. 

 

[rakeshtejak@gmail_com]

Hi Beth,I'm performing an experiment in which i would like to change the Earth's rotation (say doubled). I have tried all possible places where the variable sday and omega is present, but couldn't get any positive result. In all of these cases the downwelling solar flux at the top of the atmosphere remain unchanged. It would be great if you could suggest me in this regard.Thank you.Regards. 

 

[rakeshtejak@gmail_com]

Hi Beth,I'm performing an experiment in which i would like to change the Earth's rotation (say doubled). I have tried all possible places where the variable sday and omega is present, but couldn't get any positive result. In all of these cases the downwelling solar flux at the top of the atmosphere remain unchanged. It would be great if you could suggest me in this regard.Thank you.Regards. 

 

[bethproedrou@gmail_com]

Hello,The variable Omega should be the vertical wind speed so changing it would not affect the planet's rotation. I am not sure what sday does in the model, but if you want to change the rotation rate you should change:SHR_CONST_SDAY in shr_const_mod.F90APTIME in apex_subs.F90 However as far as I know the solar radiation at the top of the model is a constant preset by the model. Beth 

 

[bethproedrou@gmail_com]

Hello,The variable Omega should be the vertical wind speed so changing it would not affect the planet's rotation. I am not sure what sday does in the model, but if you want to change the rotation rate you should change:SHR_CONST_SDAY in shr_const_mod.F90APTIME in apex_subs.F90 However as far as I know the solar radiation at the top of the model is a constant preset by the model. Beth 

 

[bethproedrou@gmail_com]

Hello,The variable Omega should be the vertical wind speed so changing it would not affect the planet's rotation. I am not sure what sday does in the model, but if you want to change the rotation rate you should change:SHR_CONST_SDAY in shr_const_mod.F90APTIME in apex_subs.F90 However as far as I know the solar radiation at the top of the model is a constant preset by the model. Beth 

 

[rakeshtejak@gmail_com]

Hi,Thanks for your reply. I might have mentioned angular momentum (SHR_CONST_OMEGA) instead of omega. Suppose i would like to change rotation of earth to zero, then is it correct to setAPTIME = 0._r8orAPTIME = 0._r8 +ETDEG.And after simulation how should i confirm whether changes were implemented or not? Thank you. Regards. 

 

[rakeshtejak@gmail_com]

Hi,Thanks for your reply. I might have mentioned angular momentum (SHR_CONST_OMEGA) instead of omega. Suppose i would like to change rotation of earth to zero, then is it correct to setAPTIME = 0._r8orAPTIME = 0._r8 +ETDEG.And after simulation how should i confirm whether changes were implemented or not? Thank you. Regards. 

 

[rakeshtejak@gmail_com]

Hi,Thanks for your reply. I might have mentioned angular momentum (SHR_CONST_OMEGA) instead of omega. Suppose i would like to change rotation of earth to zero, then is it correct to setAPTIME = 0._r8orAPTIME = 0._r8 +ETDEG.And after simulation how should i confirm whether changes were implemented or not? Thank you. Regards. 

 

[luoyangcheng96@pku_edu_cn]

Hi Rakesh,I am also trying to slowing down the rotation of a tidally-locked planet. Could you please tell me the results of the modification to APTIME, and how to confirm whether the changes are implemented?Thank you in advance.Yangcheng

 

[luoyangcheng96@pku_edu_cn]

Hi Rakesh,I am also trying to slowing down the rotation of a tidally-locked planet. Could you please tell me the results of the modification to APTIME, and how to confirm whether the changes are implemented?Thank you in advance.Yangcheng

 

[luoyangcheng96@pku_edu_cn]

Hi Rakesh,I am also trying to slowing down the rotation of a tidally-locked planet. Could you please tell me the results of the modification to APTIME, and how to confirm whether the changes are implemented?Thank you in advance.Yangcheng