Question about total solar radiation absorbed by the veg (i.e., SABV) in the crop model

[mengqi]

Hi,

I am using the latest version of CLM5. In my surface data, I assigned 'PCT_NATVEG' = 0 and 'PCT_CROP' = 100. Further, for 'PCT_CFT', I assigned PCT_CFT [2] = 100, which suggests a corn field in my case. When I displayed the total solar radiation absorbed by the vegetation (i.e., SABV) and total projected leaf area index (i.e., TLAI) respectively, there seem to be some weird results.



As shown in the plots, when TLAI = 0 during Jan and May (left plot), SABV are not 0 (right plot). My understanding is that there should be 0 for SABV if TLAI = 0.

Could someone give me some input? Thanks!!

 

[oleson]

Can you plot TSAI?

 

[mengqi]

Can you plot TSAI?

Hi Oleson,

According to TSAI below, I think SABV (non-zero) is due to the existence of TSAI.

However, I am curious why the stem exists before planting, such as Jan or Dec. CLM5-Crop states that the minimum planting date for corn is April 1. In this context, there is no stem. Is my understanding right? Thanks for your insights in advance!

 

[oleson]

According to the technical note:

"the S is kept at 0.25 to simulate a post-harvest “stubble” on the ground."

 

[mengqi]

According to the technical note:

"the S is kept at 0.25 to simulate a post-harvest “stubble” on the ground."

Thank you!! That makes sense to me!