In this contribution, we give an overview of the ozonesonde stations that homogenized their ECC time series according to the principles of the O3S-DQA activity. We also present the roadmap to increase the number of homogenized (European) ozonesonde stations, in close collaboration with the station PIs. We will also discuss the different possibilities to make the already homogenized datasets...
An international effort to improve ozonesonde data quality and to reevaluate historical records has made significant improvements in the accuracy of global network data. However, between 2014 and 2016, ozonesonde total column ozone (TCO; O3) at 14 of 37 regularly reporting stations exhibited a sudden drop-off relative to satellite measurements. The ozonesonde TCO drop is 3-7 % compared to...
After the Montreal protocol banned ozone depleting substances, first signs of an ozone recovery in the stratosphere were observed starting in 1997. Recent studies have reported positive trends indicating that ozone is recovering in the upper stratosphere at mid-latitudes. However, stratospheric ozone trends from various ground-based data sets still differ in magnitude.
To partly explain such...
Within the Network for the Detection of Atmospheric Composition Changes (NDACC), ozone total content and vertical distribution are monitored by various measurement techniques at Observatoire de Haute-Provence (44°N, 6°E) in Southern France. For the vertical distribution, these techniques include two ozone lidars for the measurement of stratospheric and tropospheric ozone vertical profiles, in...
The study aims to revise historical NOAA Umkehr records with improved stray light corrections. Overpass data are generated for the GB sites using the combination techniques of the NOAA Cohesive (COH) zonal ozone product. The optimized Umkehr and COH station overpass data are compared to evaluate the long-term consistency in these records and improve homogenization techniques. The final goal is...
