Verification of the Atmospheric Infrared Sounder (AIRS) and the Microwave Limb Sounder (MLS) ozone algorithms based on retrieved daytime and night-time ozone
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Published:2021-03-01
Issue:2
Volume:14
Page:1673-1687
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Wang Wannan, Cheng Tianhai, van der A Ronald J.ORCID, de Laat Jos, Williams Jason E.
Abstract
Abstract. Ozone (O3) plays a significant role in weather and
climate on regional to global spatial scales. Most studies on the
variability in the total column of O3 (TCO) are typically carried out
using daytime data. Based on knowledge of the chemistry and transport of
O3, significant deviations between daytime and night-time O3 are
only expected either in the planetary boundary layer (PBL) or high in the
stratosphere or mesosphere, with little effect on the TCO. Hence, we
expect the daytime and night-time TCO to be very similar. However, a detailed
evaluation of satellite measurements of daytime and night-time TCO is still
lacking, despite the existence of long-term records of both. Thus, comparing
daytime and night-time TCOs provides a novel approach to verifying the
retrieval algorithms of instruments such as the Atmospheric Infrared Sounder (AIRS)
and the Microwave Limb Sounder (MLS). In addition, such a comparison also
helps to assess the value of night-time TCO for scientific research.
Applying this verification on the AIRS and the MLS data, we identified
inconsistencies in observations of O3 from both satellite
instruments. For AIRS, daytime–night-time differences were found over oceans
resembling cloud cover patterns and over land, mostly over dry land areas,
which is likely related to infrared surface emissivity. These differences point to
issues with the representation of both processes in the AIRS retrieval
algorithm. For MLS, a major issue was identified with the
“ascending–descending” orbit flag, used to discriminate night-time and
daytime MLS measurements. Disregarding this issue, MLS day–night differences
were significantly smaller than AIRS day–night differences, providing
additional support for the retrieval method origin of AIRS in stratospheric
column ozone (SCO) day–night differences. MLS day–night differences are
dominated by the upper-stratospheric and mesospheric diurnal O3 cycle. These results provide useful information for improving infrared
O3 products.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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