Correction of the Observatoire Haute Provence electrochemical concentration cell (ECC) ozonesonde long-term data record over the 2002–2007 period
Abstract
The Observatoire Haute Provence (OHP) station is one of the few long-term measuring stations for vertical ozone profiles in southern Europe. Since 1991, vertical ozone distribution has been monitored by the OHP weekly electrochemical concentration cell (ECC) ozonesonde. In this study, we have corrected the ECC datasets for the period 2002–2007. The correction of the ECC has been carried out using comparisons with other ozone-measuring instruments at the same station (stratospheric lidar and Système d'Analyse par Observation Zénithale (SAOZ) photometer) and with collocated satellite observations of the ozone vertical profile by Aura-Microwave Limb Sounder (MLS). Median ozone concentration of the ECC for the period 2002–2007 was −3.4 % lower than that of the stratospheric lidar and MLS. The ECC internal pump temperature showed a sudden drop of 16 K at 25 km for the period 2002–2007 compared to the period 1991–2001. Considering the long-term trends of the ECC current and stratospheric lidar ozone concentration at 25 km as well as the ECC pump flow rate trend, we show that the recorded ECC pump temperature between 2002 and 2007 is too low by 10 K at 25 km. The ECC pump temperature for the period 2002–2007 has been corrected using a linear altitude-dependent increasing rate of 0.33 K km−1. As a result, the corresponding ECC ozone bias at 25 km with the stratospheric lidar and MLS have been reduced to −0.5 %. The corrected OHP ECC data are available at https://doi.org/10.25326/855 (Ancellet and Godin-Beekmann, 2025).
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BibTeX
@article{okamoto2026correction,
title = {{Correction of the Observatoire Haute Provence electrochemical concentration cell (ECC) ozonesonde long-term data record over the 2002–2007 period}},
author = {Sachiko Okamoto and Gerard Ancellet and Sophie Godin-Beekmann and Renaud Bodichon},
journal = {Earth System Science Data},
year = {2026},
month = aug,
doi = {10.5194/essd-18-5939-2026},
url = {https://hal.science/hal-05554512v2},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Correction of the Observatoire Haute Provence electrochemical concentration cell (ECC) ozonesonde long-term data record over the 2002–2007 period
AU - Sachiko Okamoto
AU - Gerard Ancellet
AU - Sophie Godin-Beekmann
AU - Renaud Bodichon
PY - 2026
DA - 2026/08/21
JO - Earth System Science Data
DO - 10.5194/essd-18-5939-2026
UR - https://hal.science/hal-05554512v2
AB - The Observatoire Haute Provence (OHP) station is one of the few long-term measuring stations for vertical ozone profiles in southern Europe. Since 1991, vertical ozone distribution has been monitored by the OHP weekly electrochemical concentration cell (ECC) ozonesonde. In this study, we have corrected the ECC datasets for the period 2002–2007. The correction of the ECC has been carried out using comparisons with other ozone-measuring instruments at the same station (stratospheric lidar and Système d'Analyse par Observation Zénithale (SAOZ) photometer) and with collocated satellite observations of the ozone vertical profile by Aura-Microwave Limb Sounder (MLS). Median ozone concentration of the ECC for the period 2002–2007 was −3.4 % lower than that of the stratospheric lidar and MLS. The ECC internal pump temperature showed a sudden drop of 16 K at 25 km for the period 2002–2007 compared to the period 1991–2001. Considering the long-term trends of the ECC current and stratospheric lidar ozone concentration at 25 km as well as the ECC pump flow rate trend, we show that the recorded ECC pump temperature between 2002 and 2007 is too low by 10 K at 25 km. The ECC pump temperature for the period 2002–2007 has been corrected using a linear altitude-dependent increasing rate of 0.33 K km−1. As a result, the corresponding ECC ozone bias at 25 km with the stratospheric lidar and MLS have been reduced to −0.5 %. The corrected OHP ECC data are available at https://doi.org/10.25326/855 (Ancellet and Godin-Beekmann, 2025).
SN - 1866-3508
SN - 1866-3516
ER -