Discrepancy between MCIPv5.4 and MCIPv5.5

MCIP
1

Hi,

I noticed a 200-meter difference in YORIG values in GRIDDESC files between MCIPv5.4 and MCIPv5.5, despite using the exact same inputs. Below are the results for your review. I would appreciate any help in identifying the cause of this discrepancy.

MCIPv5.4
grid resolution (XORIG, YORIG)
36-km (-1,314,000, -943,000)
12-km (-1,110,000, -739,000)
4-km (-130,000, -119,000)

MCIPv5.5
36-km (-1,314,000, -943,200)
12-km (-1,110,000, -739,200)
4-km (-130,000, -119,200)

2

Hi @FengLiu!

The differences that you are seeing in YORIG are the result of a bug that was corrected in MCIPv5.5. The details are explained in the

this is an internal to EPA link: MCIP CHANGE log for MCIPv5.5.

external (public) link: CMAQ/PREP/mcip/docs/CHANGES at main · USEPA/CMAQ · GitHub

Please follow up if you have additional questions.

–Tanya

3 Likes
3

Tanya,

Thanks for confirming!

Feng