Categories
Reanalysis

Downloading MERRA2 data

I tried to download some MERRA2 data, and realised that I’d deleted all my old scripts! So, here I go again…

Preliminary steps:

  1. Register / Log in to the NASA EARTHDATA site: https://urs.earthdata.nasa.gov/home
  2. Follow the steps to link GES DISC with your account: https://disc.gsfc.nasa.gov/earthdata-login
  3. Verify by downloading this example data file URL

Go to the NASA Goddard Earth Sciences (GES) Data and Information Services Center (DISC) page: https://disc.gsfc.nasa.gov/

  • Source: Models/Analyses MERRA-2
  • Temporal Resolution: 1 hour

Choose “Subset / Get data” for the instantaneous ‘Single-Level Diagnostics’ file.

Under “Download Method” there are two relevant options, as we want to download a spatial domain:

  • Subset using OPeNDAP
  • Subset using GES DISC. This option seems to also allow regridding.

I selected OPeNDAP, as I don’t need to regrid the data.

I didn’t change the dates under ‘Refine Date Range’: 1980-01-01 to 2021-08-31

I used ‘Refine Region’ to select a region around Ireland: -11,51,-5,56 and I kept the ‘Use ‘Refine Region’ box checked.

Under ‘Variables’ I selected surface wind speed, and I kept output format as netCDF.

Click ‘Get Data’ and download the links list

Follow the steps to set up wget or curl here: https://disc.gsfc.nasa.gov/data-access#mac_linux_wget

I downloaded the data to the mccdata server using curl.