Search found 357 matches

by barbara.stunder
March 19th, 2013, 12:03 pm
Forum: HYSPLIT for PCs
Topic: How to generate multiple G-earth output file?
Replies: 3
Views: 2732

Re: How to generate multiple G-earth output file?

Make a variant of the "run daily" tcl script that also creates the Google Earth output. The tcl scripts in the hysplti4/guicode directory are text files. In auto_traj.tcl, the "trajplot.exe" command can be added right after the hyts_std.exe command which creates the trajectory. Run "\hysplti4\exec\t...
by barbara.stunder
March 19th, 2013, 11:46 am
Forum: Cluster Analysis
Topic: Mean clusters algorithms
Replies: 1
Views: 2063

Re: Mean clusters algorithms

Ward's. Agglomerative and hierarchical. Stunder, B.J.B., 1996: An assessment of the quality of forecast trajectories. J. Appl. Meteor. 35(8):1319-1331. Available online at http://journals.ametsoc.org/doi/pdf/10. ... 2.0.CO%3B2
by barbara.stunder
February 11th, 2013, 3:04 pm
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Why GDAS0P5 data have no w velocity?
Replies: 6
Views: 3504

Re: Why GDAS0P5 data have no w velocity?

Have you tried running the trajectory ensemble for a starting point/time where you get a large difference and a case where they are similar? I wonder if the case with the w-value in the model output would be within the envelope of the ensemble with the gdas0p5? The ensemble provides an estimate of t...
by barbara.stunder
January 15th, 2013, 8:21 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Why GDAS0P5 data have no w velocity?
Replies: 6
Views: 3504

Re: Why GDAS0P5 data have no w velocity?

GDAS0P5 are NOT converted from the same GDAS dataset with GDAS1 data. For ARL's GDAS1, NCEP post-processes NCEP GDAS output into 1-degree, pressure level data which includes vertical velocity. ARL takes that and processes it. For ARL's GDAS0P5, ARL post-processes NCEP GDAS output into half-degree, ...
by barbara.stunder
January 8th, 2013, 11:02 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: Why GDAS0P5 data have no w velocity?
Replies: 6
Views: 3504

Re: Why GDAS0P5 data have no w velocity?

GDAS0P5 are NOT converted from the same GDAS dataset with GDAS1 data. For ARL's GDAS1, NCEP post-processes NCEP GDAS output into 1-degree, pressure level data which includes vertical velocity. ARL takes that and processes it. For ARL's GDAS0P5, ARL post-processes NCEP GDAS output into half-degree, h...
by barbara.stunder
January 7th, 2013, 10:15 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: GDAS0P5 data extraction
Replies: 11
Views: 4986

Re: GDAS0P5 data extraction

dolces wrote:How can I extract specific vertical layers from GDAS0P5 and re-write into a new ARL format data?
Can MeteoInfo do this? Link to MeteoInfo at http://ready.arl.noaa.gov/HYSPLIT.php
by barbara.stunder
January 7th, 2013, 9:54 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: GDAS0P5 data extraction
Replies: 11
Views: 4986

Re: GDAS0P5 data extraction

dolces wrote:Are ARL data in ASCII format? Can I use MATLAB to read and re-write them?
Only the header for each record is in ASCII format. See the information and the sample FORTRAN program chk_data.f at the bottom of http://ready.arl.noaa.gov/archives.php

I am not familiar with MATLAB.
by barbara.stunder
December 21st, 2012, 9:30 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: GDAS0P5 data extraction
Replies: 11
Views: 4986

Re: GDAS0P5 data extraction

The HYSPLIT spatial extract program xtrct_grid, only extracts the lowest X number of levels, you cannot tell it which particular levels to get. The GDAS1 levels are on pressure surfaces and the GDAS0P5 are on hybrid sigma-pressure, so except for the higher levels, the comparison would not be direct...
by barbara.stunder
December 21st, 2012, 9:09 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: GDAS0P5 data extraction
Replies: 11
Views: 4986

Re: GDAS0P5 data extraction

Yes, with the 'cat' command.
cat day2 >> day1
by barbara.stunder
December 20th, 2012, 8:35 am
Forum: General questions on meteorological data needed for HYSPLIT
Topic: GDAS0P5 data extraction
Replies: 11
Views: 4986

Re: GDAS0P5 data extraction

The HYSPLIT spatial extract program xtrct_grid, only extracts the lowest X number of levels, you cannot tell it which particular levels to get. The GDAS1 levels are on pressure surfaces and the GDAS0P5 are on hybrid sigma-pressure, so except for the higher levels, the comparison would not be direct.