In:
Atmospheric Measurement Techniques, Copernicus GmbH, Vol. 14, No. 6 ( 2021-06-29), p. 4737-4753
Abstract:
Abstract. ALTIUS (Atmospheric Limb Tracker for the Investigation of the Upcoming Stratosphere) is the upcoming stratospheric ozone monitoring limb sounder from ESA's Earth Watch programme. Measuring in the ultraviolet–visible–near-infrared (UV–VIS–NIR) spectral regions, ALTIUS will retrieve vertical profiles
of ozone, aerosol extinction coefficients, nitrogen dioxide and other trace
gases from the upper troposphere to the mesosphere. In order to maximize the
geographical coverage, the instrument will observe limb-scattered solar light during daytime (i.e. bright limb observations), solar occultations at the
terminator and stellar/lunar/planetary occultations during nighttime. This
paper evaluates the constraint of ALTIUS ozone profiles on modelled
stratospheric ozone by means of an observing system simulation experiment (OSSE). In this effort, a reference atmosphere has been built and used to
generate ALTIUS ozone profiles, along with an instrument simulator. These
profiles are then assimilated to provide ozone analyses. A good agreement is
found between the analyses and the reference atmosphere in the stratosphere
and in the extra-tropical upper troposphere. In the tropical upper
troposphere, although providing significant information in the analyses, the assimilation of ozone profiles does not completely eliminate the bias with
respect to the reference atmosphere. The impacts of the different modes of observations have also been evaluated, showing that all of them are necessary
to constrain ozone during polar winters where solar/stellar occultations are
the most important during the polar night and bright limb data are the most
important during the development of the ozone hole in the polar spring.
Type of Medium:
Online Resource
ISSN:
1867-8548
DOI:
10.5194/amt-14-4737-2021
DOI:
10.5194/amt-14-4737-2021-supplement
Language:
English
Publisher:
Copernicus GmbH
Publication Date:
2021
detail.hit.zdb_id:
2505596-3
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