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Downloading one year ERA5 data
Posted: June 27th, 2024, 6:24 am
by prerita
Hi
I intend to download all the months using the script here
https://github.com/amcz/hysplit_metdata ... ra5_cds.py
But the given Python only downloads for one month and one date.
I changed the string for month and year, but it still takes the default option.
Additionally, cds client has a limit of 60,000 and I wish to download all the months without having to change script each time.
Can anyone advise please ?
Re: Downloading one year ERA5 data
Posted: June 27th, 2024, 8:12 am
by alicec
you can create a script to call get_era5_cds.py in a loop to get all the dates you want.
An example bash script is below.
Code: Select all
#!/bin/sh
# Example bash script for retrieving ERA5 for a small area.
# Author: Alice Crawford Organization: NOAA/OAR/ARL
# Example for downloading and converting ERA5 data on pressure levels
# for a relatively small area.
# python call
MDL="python"
#Location of get_era5_cds.py
PDL=$HOME/hysplit_metdata
year=2020
#small area to retrieve
# upper left lat/ upper left lon / lower right lat / lower right lon
# NORTH/WEST/SOUTH/EAST
area="65/150/40/180"
#directory to write files to.
outdir='./'
for month in '10'
do
#for day in $(seq 23 22)
for day in 23
do
echo "RETRIEVING month $month day $day"
# retrieves pressure level files
$MDL ${PDL}/get_era5_cds.py --3d -s enda -y $year -m $month -d $day --dir $outdir -g --area $area
# retrieves surface data files with all variables
$MDL ${PDL}/get_era5_cds.py --2da -s enda -y $year -m $month -d $day --dir $outdir -g --area $area
done
done
Re: Downloading one year ERA5 data
Posted: June 27th, 2024, 8:22 am
by prerita
Hi Alice,
Many thanks for this. That is helpful.
I have another question about your script /get_era5_cds.py.
I changed the 'month' : monthstr, to 'month' : [ '01' ],
in all the server.retrieve instances
hoping that it will not take the default month but the month that I provided.
However, the get_era5_message.txt still says 'retrieving 3d data for 2009-12-01' (which is the default option) and it writes the output file name as ERA5_2009.Dec01.3dpl.grib but the actual dates in grib file are 2009-01-01.
Why does it write dec in the downloaded files ?
I am not sure why. Can you advise?
Best, Prerita