Search found 255 matches

by alicec
September 23rd, 2020, 1:50 pm
Forum: Developers
Topic: Changing particle density and size during Concentration calculation
Replies: 1
Views: 4

Re: Changing particle density and size during Concentration calculation

It sounds like you should be able to use the ichem=2 and the CHEMRATE.TXT file. https://www.ready.noaa.gov/documents/Tutorial/html/chem_linear.html You could define multiple pollutatants and then specify the conversion rates. something like 1 2 1.0 1.0 2 3 1.0 1.0 3 4 1.0 1.0 start off with emitting...
by alicec
September 23rd, 2020, 1:41 pm
Forum: Dispersion Model
Topic: HYSPLIT Output MASS matter
Replies: 1
Views: 11

Re: HYSPLIT Output MASS matter

Note that the deposition layer, unlike the concentration layers, shows the accumulated amount of mass/m^2. https://www.ready.noaa.gov/documents/Tutorial/html/chem_dry.html So you should only use the last output time to calculate the total amount of mass in the deposition layer. Another thing to chec...
by alicec
September 23rd, 2020, 1:26 pm
Forum: Conversion programs
Topic: ERA5 dataset
Replies: 9
Views: 7249

Re: ERA5 dataset

You can't call it from the GUI. The code is included in the PC distribution in the data2arl/era52arl directory.
You will have to compile it yourself.
by alicec
September 23rd, 2020, 1:19 pm
Forum: Dispersion Model
Topic: mass/m2 output
Replies: 1
Views: 7

Re: mass/m2 output

You may need to post this question to the SplitR site if you want to do this with SplitR. Otherwise please see the HYSPLIT help under display options https://ready.arl.noaa.gov/hysplitusersguide/ or the HYSPLIT tutorial https://www.ready.noaa.gov/documents/Tutorial/html/index.html Note that concentr...
by alicec
September 23rd, 2020, 1:14 pm
Forum: Dispersion Model
Topic: Question about HYSPLIT total mass matter
Replies: 1
Views: 7

Re: Question about HYSPLIT total mass matter

Column mass loading values have units of mass/area and then, yes to get the total mass you multipy by the area. Concentrations have units of mass/volume then you would multiply by the volume to get total mass. HYSPLIT cdump files (https://ready.arl.noaa.gov/hysplitusersguide/S363.htm) output concent...
by alicec
September 23rd, 2020, 1:07 pm
Forum: Dispersion Model
Topic: Almost zero mass
Replies: 1
Views: 6

Re: Almost zero mass

You can use the
FRMR
namelist variable.
https://ready.arl.noaa.gov/hysplitusersguide/S630.htm

FRMR=0.01
would remove particles that had mass less than 0.01*total_mass.
by alicec
September 14th, 2020, 9:39 am
Forum: HYSPLIT Workshop
Topic: Hello,
Replies: 8
Views: 376

Re: Hello,

We encourage people who will be running many trajectories to download and run HYSPLIT from their own computers. Options for running a large number of trajectories on our system is limited. Please be very specific when describing what you want to do and what you have done. Users configure HYSPLIT in ...
by alicec
September 14th, 2020, 9:06 am
Forum: Users
Topic: Grib2 file band change and run hysplit
Replies: 1
Views: 204

Re: Grib2 file band change and run hysplit

The following can be found in Readme_api2arl.txt. You should be able to look at your api2arl.cfg file to make sure that the correct variables in the grib file are being used. The GRIB conversion is defined by the decoding configuration file which defines the relationship between the grib file variab...
by alicec
September 14th, 2020, 8:57 am
Forum: Conversion programs
Topic: ERA5 - projection conversion method
Replies: 1
Views: 142

Re: ERA5 - projection conversion method

Could you please give more information about what you are doing.
Please include how you are downloading the ERA5 data and what conversion programs you are using.
Thank you.
by alicec
August 14th, 2020, 5:11 pm
Forum: Dispersion Model
Topic: Turbulent Structures
Replies: 1
Views: 223

Re: Turbulent Structures

I'm fairly sure what you are seeing is just an artifact. I think what you are seeing is that the release of the mass is actually not continuous. The model can only create new particles at a time step. So the particles are being released at every time step, but you are in a situation where there is n...