On the use of satellite observations to fill gaps in the Halley station total ozone record
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Published:2021-06-30
Issue:12
Volume:21
Page:9829-9838
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ISSN:1680-7324
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Container-title:Atmospheric Chemistry and Physics
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language:en
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Short-container-title:Atmos. Chem. Phys.
Author:
Zhang Lily N.ORCID, Solomon Susan, Stone Kane A.ORCID, Shanklin Jonathan D., Eveson Joshua D., Colwell Steve, Burrows John P.ORCID, Weber MarkORCID, Levelt Pieternel F., Kramarova Natalya A.ORCID, Haffner David P.ORCID
Abstract
Abstract. Measurements by the Dobson ozone spectrophotometer at the
British Antarctic Survey's (BAS) Halley research station form a record of
Antarctic total column ozone that dates back to 1956. Due to its location,
length, and completeness, the record has been, and continues to be, uniquely
important for studies of long-term changes in Antarctic ozone. However, a
crack in the ice shelf on which it resides forced the station to abruptly
close in February of 2017, leading to a gap of two ozone hole seasons in its
historic record. We develop and test a method for filling in the record of
Halley total ozone by combining and adjusting overpass data from a range of
different satellite instruments. Comparisons to the Dobson suggest that our
method reproduces monthly ground-based total ozone values with an average
difference of 1.1 ± 6.2 DU for the satellites used to fill in the
2017–2018 gap. We show that our approach more closely reproduces the Dobson
measurements than simply using the raw satellite average or data from a
single satellite instrument. The method also provides a check on the
consistency of the provisional data from the automated Dobson used at Halley
after 2018 with earlier manual Dobson data and suggests that there were
likely inconsistencies between the two. The filled Halley dataset provides
further support that the Antarctic ozone hole is healing, not only during
September but also in January.
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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