Who is validating instruments with the ozone process


04-Oct-2020 23:11

Both average changes and the range of extreme values are presented, because these each provide important and distinct tests for physical and chemical understanding (just as in, for example, climate change studies).We first examine in situ ozone observations obtained by balloonsondes at ground stations.Stratospheric temperatures, gaseous nitric acid concentrations, and their relationship to ozone losses in the two hemispheres are also discussed to provide insights to chemical processes.We include ozonesonde data for the region near 20 km altitude (50-mbar pressure), where the largest local Arctic losses are typically found, but also present results for other pressure levels.These two factors taken together explain why ozone depletion in the Arctic is generally much smaller than in the Antarctic.A particularly cold Arctic stratospheric winter and spring in 2010/2011 displayed much larger ozone depletion than typical years, as highlighted by Manney et al. This noteworthy geophysical event has intrigued scientists and raised several important questions: Could this be the first Arctic ozone hole?Although limited to a few sites in each hemisphere, these are the only data that extend from the 1960s onward, before the satellite era.

Here we update and expand the comparison of ozone and related chemistry over the two polar regions.Our goal is to present the observations in a manner that readily shows similarities and differences, and provides insights into chemical processes, particularly the role of polar stratospheric cloud chemistry.



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