Search found 669 matches
- September 6th, 2018, 3:16 pm
- Forum: Developers
- Topic: Uncertainty along trajectory endpoint
- Replies: 3
- Views: 26064
Re: Uncertainty along trajectory endpoint
This "noise" function or dispersion/turbulent component is a function of time and ws stdev. The uncertainty, as you mentioned in your comment, increases as you go further back in time. In principle, the concentration mode is just a group of trajectories that have a turbulent component included in th...
- September 6th, 2018, 2:52 pm
- Forum: Users
- Topic: Problem downloading meteorology data
- Replies: 1
- Views: 1894
Re: Problem downloading meteorology data
How are you downloading the data? through a web browser?
- August 31st, 2018, 1:27 pm
- Forum: Developers
- Topic: Uncertainty along trajectory endpoint
- Replies: 3
- Views: 26064
Re: Uncertainty along trajectory endpoint
Conceptually it makes sense. However, your 2-D Gaussian noise should reflect the state of the atmosphere. Ideally, you should use the standard deviation of the horizontal wind speed as a measure for the with of your Gaussian distribution. HYSPLIT explicitly calculates the standard deviations in the ...
- August 28th, 2018, 12:10 pm
- Forum: Users
- Topic: Problems with ERAInterim data
- Replies: 1
- Views: 1745
Re: Problems with ERAInterim data
Please make sure you have all the required meteorological variables in the ARL meteorological file that you created. Use the utility program such as chk_file located in the exec directory to see if the variables exist.
- July 30th, 2018, 4:36 pm
- Forum: HYSPLIT for Mac OS X
- Topic: ascii2shp conversion software for Mac?
- Replies: 6
- Views: 32981
Re: ascii2shp conversion software for Mac?
Here is the program. Please delete the .txt extension.
- July 30th, 2018, 4:31 pm
- Forum: Dispersion Model
- Topic: Changing random number generator seed
- Replies: 2
- Views: 3244
Re: Changing random number generator seed
Unfortunately, the random number generator seed cannot be changed without recompiling the code.
- May 16th, 2018, 3:34 am
- Forum: Trajectory Model
- Topic: Trajectory height does not ascend
- Replies: 3
- Views: 5435
Re: Trajectory height does not ascend
The problem you are having is that your trajectories are hitting the ground.
Please take a look at the discussion about the that topic:
viewtopic.php?f=27&t=295&hilit=trajectory+hits+ground
Please take a look at the discussion about the that topic:
viewtopic.php?f=27&t=295&hilit=trajectory+hits+ground
- May 9th, 2018, 10:17 am
- Forum: General questions on meteorological data needed for HYSPLIT
- Topic: USER ENTERED UPPER AIR DATA NO WORKING
- Replies: 1
- Views: 3708
Re: USER ENTERED UPPER AIR DATA NO WORKING
Here you can find some information about the user entered meteorological data:
https://www.ready.noaa.gov/documents/Tu ... enter.html
https://www.ready.noaa.gov/documents/Tu ... enter.html
- May 8th, 2018, 1:18 pm
- Forum: Dispersion Model
- Topic: HYSPLIT error
- Replies: 18
- Views: 12255
Re: HYSPLIT error
Try replacing all the 0024 entries by 0001 and the 2400 by 0100. I assume you want to change your emissions hourly.
- May 4th, 2018, 11:15 am
- Forum: Trajectory Model
- Topic: Equator
- Replies: 1
- Views: 3605
Re: Equator
That will depend on the underlying meteorology. Evidently in your case there is a fair amount of vertical sheer at that location in the equator. HYSPLIT will only reflect what the meteorological data shows.