Preprints
https://doi.org/10.5194/acp-2021-122
https://doi.org/10.5194/acp-2021-122

  22 Feb 2021

22 Feb 2021

Review status: this preprint is currently under review for the journal ACP.

On the Use of Satellite Observations to Fill Gaps in the Halley Station Total Ozone Record

Lily N. Zhang1, Susan Solomon1, Kane A. Stone1, Jonathan D. Shanklin2, Joshua D. Eveson2, Steve Colwell2, John P. Burrows3, Mark Weber3, Pieternel F. Levelt4,5, Natalya A. Kramarova6, and David P. Haffner6,7 Lily N. Zhang et al.
  • 1Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, 02139, USA
  • 2British Antarctic Survey, Cambridge, CB3 0ET, UK
  • 3Institute of Environmental Physics/Institute of Remote Sensing, University of Bremen, Bremen, 28334, Germany
  • 4KNMI, De Bilt, 3731, The Netherlands
  • 5University of Technology Delft, Delft, 2628, The Netherlands
  • 6NASA Goddard Space Flight Center, Greenbelt, 20771, USA
  • 7Science Systems and Applications, Inc., Lanham, 20706, USA

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, 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. Tests suggest that our method reproduces the monthly ground-based Dobson total ozone values to within an average of 2 Dobson units. We show that our approach improves on the overall performance as compared to 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 was a significant difference 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.

Lily N. Zhang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Interesting, but needs clarification of uncertainty measures', Anonymous Referee #1, 26 Mar 2021
  • RC2: 'Comment on acp-2021-122', Anonymous Referee #2, 21 Apr 2021

Lily N. Zhang et al.

Model code and software

Read, Fill, and Analyze Halley TCO with Overpass Data Lily Zhang (contains code by Kevin Bartlett and Jonathan C. Lansey) https://doi.org/10.5281/zenodo.4553742

Lily N. Zhang et al.

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Short summary
In the 1980s, measurements at the British Antarctic Survey station in Halley, Antarctica led to the discovery of the ozone hole. The Halley total ozone record continues to be uniquely valuable for studies of long-term changes in Antarctic ozone. Environmental conditions in 2017 forced a temporary cessation of operations, leading to a gap in the historic record. We develop and test a method for filling in the Halley record using satellite data and find evidence to further support ozone recovery.
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