Publication Date:
2023-07-13
Description:
The importance of long-term ozonesonde records as a stable reference has led to increased attention to quantifying uncertainties and changes in ozonesonde data. The recent Assessment of Standard Operating Procedures for Ozone Sondes (ASOPOS 2.0; WMO/GAW Report #268) recommended that homogeneity and long-term stability in ozone sounding network time series be evaluated regularly by comparison with satellite sensors, as well as ground-based photometers.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 2013 (approximately serial number 26000). 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.It is not standard practice to calibrate individual ozonesonde pumps before launch, as this is difficult and labour-intensive; rather an average pump calibration is used in data processing. Recently, an analysis of an extensive record of individual EnSci pump calibrations made since 2009 (Nakano and Morofuji, 2022) has shown a small negative shift in the low-pressure pump correction, equal to 2% at 20 hPa and 4% at 10 hPa. This agrees very well with the average differences found with MLS at 31 hPa and 10 hPa, for Canadian data. The use of these new pump corrections with Canadian data is explored, and results are compared to MLS, and other satellite sensors.
Language:
English
Type:
info:eu-repo/semantics/conferenceObject
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