Trend quality ozone from NPP OMPS: the version 2 processing
2018
Abstract. A version 2 processing of data from two ozone monitoring
instruments on Suomi NPP, the OMPS nadir ozone mapper and the OMPS nadir
ozone profiler, has now been completed. The previously released data were
useful for many purposes but were not suitable for use in ozone trend
analysis. In this processing, instrument artifacts have been identified and
corrected, an improved scattered light correction and wavelength registration
have been applied, and soft calibration techniques were implemented to
produce a calibration consistent with data from the series of SBUV/2
instruments. The result is a high-quality ozone time series suitable for
trend analysis. Total column ozone data from the OMPS nadir mapper now agree
with data from the SBUV/2 instrument on NOAA 19 with a zonal average bias of
−0.2 % over the 60 ∘ S to 60 ∘ N latitude zone.
Differences are somewhat larger between OMPS nadir profiler and N19 total
column ozone, with an average difference of −1.1 % over the 60 ∘ S to 60 ∘ N latitude zone and a residual seasonal variation of about
2 % at latitudes higher than about 50 ∘ . For the profile retrieval,
zonal average ozone in the upper stratosphere (between 2.5 and 4 hPa) agrees
with that from NOAA 19 within ±3 % and an average bias of −1.1 %.
In the lower stratosphere (between 25 and 40 hPa) agreement is within ±3 % with an average bias of +1.1 %. Tropospheric ozone produced by
subtracting stratospheric ozone measured by the OMPS limb profiler from total
column ozone measured by the nadir mapper is consistent with tropospheric
ozone produced by subtracting stratospheric ozone from MLS from total ozone
from the OMI instrument on Aura. The agreement of tropospheric ozone is
within 10 % in most locations.
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