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. Author manuscript; available in PMC: 2020 Feb 4.
Published in final edited form as: J Clim. 2017 Jun 20;Volume 30(Iss 13):5419–5454. doi: 10.1175/JCLI-D-16-0758.1

Figure 1:

Figure 1:

Observations assimilated per 6-hr cycle in (a) MERRA and (b) MERRA-2. The temporary spike in the number of surface wind observations assimilated in MERRA-2 in late 2000 is due to an error in the pre-processing of QuikSCAT data.