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- W4384339949 abstract "Abstract. Although in principle the ECC (Electrochemical Concentration Cell) ozonesonde is an absolute measuring device, in practice it has several “artefacts” which change over the course of a flight. Most of the artefacts have been corrected in the recommendations of the Assessment of Standard Operating Procedures for Ozone Sondes Report (GAW Report No. 268), giving an overall uncertainty of 5–10 % throughout the profile. However, the conversion of sampled ozone into the measured cell current has not been fully quantified, resulting in time-varying background current and pump efficiencies. We describe an updated methodology for ECC sonde data processing that is based on JOSIE 2009/2010 and JOSIE 2017-SHADOZ test chamber data. The stoichiometry (O3/I2) factors and their uncertainties along with the fast and the slow reaction pathways for the different sensing solution types used in the global ozonesonde network are determined. Experimental evidence is given for treating the background current of the ECC-sensor as the superposition of a constant ozone independent component (IB0, measured before ozone exposure in the sonde preparation protocol) and a slow time-variant ozone-dependent current determined from the initial measured ozone current using a first-order numerical convolution. The fast sensor current is refined using the time response determined in sonde preparation with a first order deconvolution scheme. Practical procedures for initializing the numerical deconvolution and convolution schemes to determine the slow and fast ECC currents are given. Calibration functions for specific ozonesondes and sensing solution type combinations were determined by comparing JOSIE 2009/2010 and JOSIE-2017-SHADOZ profiles with the JOSIE ozone reference UV-photometer (OPM). With fast and slow currents resolved and the new calibration functions, a full uncertainty budget is obtained. The time responses correction methodology makes every ozonesonde record traceable to one standard, i.e. the OPM of JOSIE, enabling the goal of a 5 % relative uncertainty to be met throughout the global ozone network." @default.
- W4384339949 created "2023-07-15" @default.
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- W4384339949 date "2023-07-14" @default.
- W4384339949 modified "2023-10-01" @default.
- W4384339949 title "New Insights From The Jülich Ozone-Sonde Intercomparison Experiments: Calibration Functions Traceable To One Ozone Reference Instrument" @default.
- W4384339949 doi "https://doi.org/10.5194/egusphere-2023-1466" @default.
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