Improving data quality in long-term Canadian ozone sounding records

Abstract

An abrupt change in ozone bias relative to several satellite sensors --a total column ozone (TCO) “dropoff” of about 2-3% –has been reported at number of ozonesonde stations (Stauffer et al., 2020), including Canadian stations. The dropoff affects stratospheric measurements from the EnSci ozonesonde, after about 2013 (approximately serial number 25000). Corrections and additional data have reduced the estimated dropoff at mostCanadian sites (Stauffer et al., 2022). The Canadian network recently switched to Science Pump sondes (after serial number 32000), and this has reversed the dropoff, and approximately restored agreement with satellite sensors.