On the use of satellite observations to fill gaps in the Halley station total ozone record

Zhang, Lily N.; Solomon, Susan; Stone, Kane A.; Shanklin, Jonathan D.; Eveson, Joshua D.; Colwell, Steve; Burrows, John P.; Weber, Mark; Levelt, Pieternel F.; Kramarova, Natalya A.; Haffner, David P.. 2021 On the use of satellite observations to fill gaps in the Halley station total ozone record. Atmospheric Chemistry and Physics, 21 (12). 9829-9838. 10.5194/acp-21-9829-2021

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Abstract/Summary

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.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.5194/acp-21-9829-2021
ISSN:	1680-7316
Date made live:	25 Feb 2021 09:16 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/529743

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.5194/acp-21-9829-2021

ISSN:

1680-7316

Date made live:

25 Feb 2021 09:16 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/529743