1. Comment on "Observation of large and all-season ozone losses over the tropics" [AIP Adv. 12, 075006 (2022)].
- Author
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Chipperfield, Martyn P., Chrysanthou, Andreas, Damadeo, Robert, Dameris, Martin, Dhomse, Sandip S., Fioletov, Vitali, Frith, Stacey M., Godin-Beekmann, Sophie, Hassler, Birgit, Liu, Jane, Müller, Rolf, Petropavlovskikh, Irina, Santee, Michelle L., Stauffer, Ryan M., Tarasick, David, Thompson, Anne M., Weber, Mark, and Young, Paul J.
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OZONESONDES ,OZONE layer ,OZONE ,STRATOSPHERIC aerosols ,OZONE layer depletion ,ATMOSPHERIC ozone ,TROPOSPHERIC ozone - Abstract
Figures 6(a) and 6(b) in the study by L2022 used total ozone data from different sources (Total Ozone Mapping Spectrometer, Ozone Monitoring Instrument, and Ozone Mapping and Profiler Suite) without removing potential biases and drifts between the datasets, a step that is essential for accurate diagnosis of trends. [37] (hereafter L2022) used the Trajectory-mapped Ozonesonde dataset for the Stratosphere and Troposphere (TOST) to argue that there has been very substantial ozone depletion (>80%) in the tropical (30°S-30°N) lower stratosphere (LS) since the 1960s. OZONE IN THE TROPICAL LOWER STRATOSPHERE A. TOST data used by L2022 The World Ozone and Ultraviolet Radiation Data Center (WOUDC) website (https://woudc.org/data.php) hosts the TOST data in two formats: (1) ozonesonde data at 1 km intervals in altitude expanded with 4-day forward and backward trajectories to increase spatial sampling (hereafter labeled TOST RAW) and (2) a smoothed, gap-filled version of TOST RAW using linear interpolation of maps (hereafter labeled TOST SM). The stronger decline reported by L2022 is caused by inappropriate use of the gap-filled version of the TOST ozone dataset, which is based on sparse tropical ozone sondes before the 1990s. [Extracted from the article]
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- 2022
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