Vehicle emission concentration

[bilalaslam]

Hello all,

I have an annual daily hourly average carbon emission 30m resolution raster data of onroad traffic emission which means I have 24 rasters. Now from that data I want to model the carbon concentration using Hysplit model. Can someone guide me the step? How to setup the model? I read the concentration manual but unable to understand that. My key questions are:
1. How to setup input file from 24 raster data.
2. How to setup the model?
3. How to export the output into GIS layer?

Thanks alot for your support.

Best
Bilal

[christopher.loughner]

1) For area sources, you want to use an EMITIMES file. See directions on how to setup an EMITIMES file in the user guide: https://www.ready.noaa.gov/hysplitusersguide/S417.htm
Creating and using an EMITIMES file is also discussed in the online HYSPLIT Basic Tutorial: https://www.ready.noaa.gov/HYSPLIT_Tutorials.php

2) I highly recommend you start by working your way through the online HYSPLIT Basic Tutorial and then come back and post more specific questions to this forum. The online HYSPLIT Basic Tutorial is self paced and available here: https://www.ready.noaa.gov/HYSPLIT_Tutorials.php

3) There is a chapter in the Basic Tutorial concerning alternate display options and using and exporting GIS layers (Chapter 10).

[bilalaslam]

Thank you so much for your reply. I made the EMITIMES files but I get error when I try to run the model. Following is my EMITIMES file. Can you point out any mistake in it? I have data of emission of vehicles per hours at specific locations. Thanks for your help.


YYYY MM DD HH DURATION(hhhh) RECORDS
YYYY MM DD HH MM DURATION(hhmm) LAT LON HGT (m) RATE(/h) AREA(m2) HEAT(w)
2023 1 1 0 0012 100
2023 1 1 0 0 37.06193809 -113.8925405 0 0.008498356 0 0
2023 1 1 0 0 37.06361103 -113.8814365 0 0.007032922 0 0
2023 1 1 0 0 37.05303946 -113.8904526 0 0.026065981 0 0
2023 1 1 0 0 37.04246722 -113.8994661 0 0.015105024 0 0
2023 1 1 0 0 37.04414082 -113.8883652 0 0.011846119 0 0
2023 1 1 0 0 37.03356879 -113.8973779 0 0.026933106 0 0
2023 1 1 0 0 37.02299609 -113.9063879 0 0.02356701 0 0
2023 1 1 0 0 37.02467036 -113.8952902 0 0.001002408 0 0
2023 1 1 0 0 37.01409787 -113.9042994 0 0.02574315 0 0
2023 1 1 0 0 37.00352471 -113.913306 0 0.020875342 0 0
2023 1 1 0 0 37.00519964 -113.9022114 0 0.004969852 0 0
2023 1 1 0 0 36.9946267 -113.9112172 0 0.008964978 0 0
2023 1 1 0 0 36.98405308 -113.9202205 0 0.005064098 0 0
2023 1 1 0 0 36.98572868 -113.909129 0 0.002107066 0 0
2023 1 1 0 0 36.97515527 -113.9181314 0 0.007173345 0 0

[alicec]

It looks like you are missing the DURATION column. I added a duration of 12 h for the release below in bold.
If you want a release time of only 1 h it would be 0100. If you want a release time of 5 minutes it would be 0005.
Also, your release height is 0 m which probably isn't what you want.

YYYY MM DD HH DURATION(hhhh) RECORDS
YYYY MM DD HH MM DURATION(hhmm) LAT LON HGT (m) RATE(/h) AREA(m2) HEAT(w)
2023 1 1 0 0012 100
2023 1 1 0 0 1200 37.06193809 -113.8925405 0 0.008498356 0 0
2023 1 1 0 0 1200 37.06361103 -113.8814365 0 0.007032922 0 0
2023 1 1 0 0 1200 37.05303946 -113.8904526 0 0.026065981 0 0

Do you have 100 lines in your file? That number is supposed to indicate the number of lines in the emission cycle.
It doesn't look like you have 100 lines, but that may be because you didn't paste the entire file?

YYYY MM DD HH DURATION(hhhh) RECORDS
YYYY MM DD HH MM DURATION(hhmm) LAT LON HGT (m) RATE(/h) AREA(m2) HEAT(w)
2023 1 1 0 0012 100

The other thing you have to make sure of is that the number of sources in your CONTROL file matches the number of sources in
your emitimes file. HYSPLIT first allocates arrays based on what is in the CONTROL file, then it reads the emitimes file to fill those arrays. So
if the arrays created by the information in the CONTROL file are not the correct size for what is in the emitimes file, the model will usually crash.
The number of lines in each emission cycle in the emitimes file should be equal to the number of locations in the CONTROL file multiplied by the number of species in the CONTROL file. So if you are only modeling 1 species in your control file and you have 100 lines in your emitimes file, then you will need to have 100 sources in your CONTROL file. If you are modeling 2 species, then you would need 50 sources in your CONTROL file.

[bilalaslam]

Thank you for your reply, it was really helpful. Now I have couple of confusions.
1. I have data of vehicle emission data with 30m interval for my study area, mean I have almost 10000 data points, so now do I need to setup the locations 10000 and put location of them manually in setup start locations?
2. What would be the specie in this case? Because I want to map the concentration, and I do not know the species? Will each location act as specie?

Thank you for your kind help.

[alicec]

1. Usually people setup some sort of script to write the emitimes file. Yes you need to specify all 10,000 points. You could split it up
into a few runs - e.g. 10 runs with 1000 points each.

2. The species or pollutant gives information about the substance you are modeling. See the following links.
https://www.ready.noaa.gov/hysplitusersguide/S312.htm
https://www.ready.noaa.gov/hysplitusersguide/S314.htm
It sounds like you are probably only modeling one type of species/pollutant.