In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 15, No. 20 ( 2022-10-25), p. 6145-6161
Abstract:
Abstract. We developed a set of solar zenith angle, latitude- and
altitude-dependent scaling factors to account for the diurnal variability in
ozone (O3) and nitrogen dioxide (NO2) when comparing Stratospheric
Aerosol and Gas Experiment (SAGE) III/ISS observations to observations from
other times of day. The scaling factors are calculated as a function of
solar zenith angle from the four-dimensional output of a global atmospheric chemistry model simulation of 2017–2020 that shows good agreement with
observed vertical profiles. Using a global atmospheric chemistry model
allows us to account for both chemically and dynamically driven variability.
Both year-specific scale factors and a multi-year monthly climatology are
available to decrease the uncertainty in inter-instrument comparisons and
allow consistent comparisons between observations from different times of
day. We describe the variability in the diurnal scale factors as a function
of space and time. The quasi-biennial oscillation (QBO) appears to be a
contributing factor to interannual variability in the NO2 scaling
factors, leading to differences between years that switch sign with
altitude. We show that application of these scaling factors improves the
comparison between SAGE III/ISS and OSIRIS NO2 and between SAGE III/ISS and OMPS LP, OSIRIS, and ACE-FTS O3 observations. The comparisons between SAGE III/ISS O3 for sunrise or sunset vs. Microwave Limb Sounder (MLS) daytime or nighttime observations are also more consistent when we apply the diurnal scaling factors. There is good agreement between SAGE III/ISS V5.2
ozone and correlative measurements, with differences within 5 % between
20 and 50 km when corrected for diurnal variability. Similarly, the SAGE III/ISS V5.2 NO2 agreement with correlative measurement is mostly within
10 %. While the scale factors were designed for use with SAGE III/ISS
observations, they can easily be applied to other observation
intercomparisons as well.
Type of Medium:
Online Resource
ISSN:
1867-8548
DOI:
10.5194/amt-15-6145-2022
DOI:
10.5194/amt-15-6145-2022-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2022
detail.hit.zdb_id:
2505596-3
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