Search found 55 matches

by Smaug
February 13th, 2018, 1:30 pm
Forum: Dispersion Model
Topic: Wind Profile
Replies: 2
Views: 1645

Wind Profile

Hi, I am looking at the met profile for a met file with .gbl extension and I wanted to ask how the degrees for the wind direction WDIR is defined? Is zero degrees on the North-East line? The profile also doesn't interpolate as well and for each temporal profile the file has the following line in the...
by Smaug
February 6th, 2018, 9:48 am
Forum: Dispersion Model
Topic: 0.25 Degree Met Data
Replies: 2
Views: 1676

0.25 Degree Met Data

Hi,

Is there any available data at 0.25 degree spatial resolution similar to GDAS? (Excluding forecast data)

Thanks
by Smaug
November 28th, 2017, 1:19 pm
Forum: Dispersion Model
Topic: GDAS 1 Degree vs 0.5 Degree
Replies: 5
Views: 2988

Re: GDAS 1 Degree vs 0.5 Degree

Thanks,


Up to what altitudes do these met files go up to? It seems HYSPLIT produces an error if the top of the atmospheric domain is greater than 100km.
by Smaug
November 15th, 2017, 7:41 am
Forum: Dispersion Model
Topic: GDAS 1 Degree vs 0.5 Degree
Replies: 5
Views: 2988

GDAS 1 Degree vs 0.5 Degree

Hi,

Does the temporal resolution between the GDAS 1 Degree and GDAS 0.5 Degrees available on the FTP Server differ?

Many Thanks
by Smaug
October 11th, 2017, 10:49 am
Forum: Users
Topic: Forecast Data
Replies: 3
Views: 1707

Re: Forecast Data

Hi, I have checked the link and it seems there are no files for future times. The file at hysplit.t06z.gfsf for 11th October is the most recent file. Each file is also around 700MB for a 6 hour forecast. This results in roughly 2.84GB for a single day. The 0.25 GFS degree resolution is 2.1GB per day...
by Smaug
October 10th, 2017, 10:00 am
Forum: Users
Topic: Forecast Data
Replies: 3
Views: 1707

Forecast Data

Hi,

The NOAA FTP server provides GFS data at 0.5 spatial resolution. These files are however to large and I am looking for current forecast data that is compatible with HYSPLIT and ideally at 1 degree resolution. Does the NOAA FTP server provide such forecast data?

Kind Regards
by Smaug
September 18th, 2017, 7:21 am
Forum: Dispersion Model
Topic: Improving Statistics
Replies: 1
Views: 1707

Improving Statistics

Hi, Does HYSPLIT/can HYSPLIT introduce a form of biasing that would allow us to gain better statistics for long transport times? For example, in Monte-Carlo modeling of particle transport through materials, a 'doubler' is applied, as particle numbers die away (as they propagate through shielding). A...
by Smaug
September 8th, 2017, 3:04 pm
Forum: Dispersion Model
Topic: Source Sensitivty Functions
Replies: 1
Views: 1641

Source Sensitivty Functions

Hi, Section 12.4 of the tutorial uses data from multiple samplers to produce a source sensitivity function. The grid cell with the highest source region is taken to be the estimate of the release location. 1. Is there any literature/reading that can mathematically describe what these source sensitiv...
by Smaug
August 18th, 2017, 4:35 am
Forum: Trajectory Model
Topic: MPI RUN
Replies: 3
Views: 1413

Re: MPI RUN

I am calculating 96 trajectories. Three trajectories for each sampling entry in the sampling input file.
by Smaug
August 17th, 2017, 7:16 am
Forum: Trajectory Model
Topic: MPI RUN
Replies: 3
Views: 1413

MPI RUN

Hi,

I am currently having difficulty using MPI for a trajectory run. I've changed the executable call to:

mpirun -np 4 {HOME}/...../hytm_std

This runs the model but with only one core and then returns a segmentation fault at the end. MPI runs have been successful with concentration runs.


Thanks