. Author manuscript; available in PMC: 2018 Apr 1.

Published in final edited form as: J Clim. 2017 Apr 4;30(No 8):2961–2988. doi: 10.1175/JCLI-D-16-0699.1

Table 6.

Discontinuities in the ozone observing system.

Time /period	Source of discontinuity
1–31 March 1991	Missing NOAA-11 SBUV observations; no ozone data are assimilated
Late 1994	SBUV coverage limited to latitudes north of 30°S
1 October 2004	Introduction of EOS Aura data; SBUV data turned off
27 March – 18 April 2011	MLS data outage
1 June 2015	Transition from Version 2.2 to Version 4.2 of MLS retrievals
1 May 2016	The 261 hPa MLS level turned off
29 May – 13 June 2016	OMI data outage (not discussed in this study but included here for completeness)