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This is a step-by-step walkthrough explaining how to download
NARCCAP data from the Earth System Grid data portal. To download
NARCCAP data:
- Go to the Earth System Grid homepage, http://www.earthsystemgrid.org/.
- Click the "Login" tab and log in to the system. You can't
download NARCCAP data unless you are logged-in and your account has
been approved for NARCCAP access. (See http://www.narccap.ucar.edu/users
for more information about NARCCAP access requirements.)
- From the "Home" tab, click the NARCCAP logo or link in the middle
of the page.
- NARCCAP data is organized by model and driver. The top-level
catalog page for NARCCAP shows a grid with RCM along the vertical axis
and GCM (or NCEP observed data) along the horizontal axis. Click the
folder icon of the RCM/driver combination you're interested in.
- At the next level, data files are organized by variable into
tables (groups). See the data tables
page to find which table contains the variable you are interested in.
For example, if you want surface temperature data, you want variable
tas from Table 2. Note that primary impacts-assessment
variables are all in Table 2. Click the appopriate link.
- Click the "Download files for this collection" link.
- The page will list individual datafiles. To download a file,
click the "download" link in the rightmost column.
- If you want to download multiple files using wget, select the
files using the checkboxes (you may find the subselection panel to the
left helpful), then click the "Download ALL Selected File(s)" button
at the top of the page. Then click the download icon next to "WGet
Script Download" to download a wget script.
NARCCAP data filenames are of the form
VarName_ModelName_DriverName_Time.nc.
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VarName is the IPCC/CF-convention Variable Name
as listed in the data tables
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ModelName is the 4-character RCM identifier
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DriverName is "NCEP" or the name of the driving GCM
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Time is the starting time of the file, in the form
YearMonthDayUTC.
Each file contains data for a single variable for 5 years, ending
in a year that ends in 0 or 5. (Files covering the beginning and
ending of the run may not contain a full five years of data.)
So, for example, tas_RCM3_ncep_1981010103.nc contains
data for variable tas from the RegCM3 regional model
driven with NCEP boundary conditions starting at 03 UTC on January
1st, 1981 and ending at 00 UTC on January 1st, 1985.
3-D data (from Table 5) is separated into levels. The pressure
height of the level in hPa is indicated in the filename between the
driver and the time:
ta_RCM3_ncep_p750_1981010103.nc
contains data at the 750 hPa pressure height.
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