OUTPUT_LOCAL_TIME "Y" for c1c2 c3 in NEI2017 emf run script

NEI Modeling Platform
1

Hi,

I have a quick question. I am not sure why OUTPUT_LOCAL_TIME “Y” for cmv_c1c2 cmv_c3 in NEI2017 EMF run script. Could I know the reason for this?
If run model using emission with GMT, I should set OUTPUT_LOCAL_TIME “N", right?

Thank you.

2

Because the hourly data is already in GMT. When OUTPUT_LOCAL_TIME is set to “Y” it passes through the hourly temporalized values without a time zone adjustment. So, even though it says OUTPUT_LOCAL_TIME it is really outputting GMT.

3

Thank you for your reply.
Is it still output GMT if I delete this flag for cmv but still with setenv OUTZONE “0”?

4

No. If you set it to N, then SMOKE will think CMV hourly inventory is in local time and apply the time shift So you need to set it to Y for CMV processing

5

Thank you for your reply.
If set N, which time zone will it shift to? or which flag will decide the time zone it shifts to?

6

Here is the information on how the time zones are handled in SMOKE. Temporal program will perform the time shift by FIPS (county/state/county).
https://www.cmascenter.org/smoke/documentation/4.8.1/html/ch02s10s04.html

7

Why are you considering changing it?

8

I deleted this flag when I ran CMV, then merged emission, converted and ran WRF/Chem before. Just wanted to make sure although I deleted this flag, I set OUTZONE is “0”, will it time shift to GMT, so I don’t have to rerun.
Anyway, I think I need to rerun CMV and redo those things.
Thank you for your and bbaek’s reply!