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Trends in short-term variability of total column ozone over Europe for the period 1980–2020 from the ground-based observations and ERA5 reanalysis
https://orcid.org/0000-0002-3138-3951
Abstract The aim of this study is to analyse daily fluctuations in total column ozone (TCO3) to look for trends in characteristics of the passage of low/high TCO3 systems across Europe in the period 1980–2020. For each season of the year in the period 1980–2020, the sample of one-day change in TCO3 as the percentage of the mean ozone for two consecutive days is calculated for twelve ground-based stations with long-term and frequent TCO3 observations. For comparison purposes, the corresponding ERA5 reanalysis data are also considered. Using the seasonal samples of one-day TCO3 fluctuation, the following metrics for the ozone changes are calculated: standard deviation, frequency of exceeding two arbitrarily selected thresholds (10% and 20% for the absolute value of one-day TCO3 fluctuation), and extremes (minimum and maximum value). Both ground-based and ERA5 data provide similar mean values for these metrics in the period 1980–2020. Statistically significant trends in the metrics are only calculated for ∼10% and ∼5% of cases using the ground-based and ERA5 data, respectively. There are both negative and positive trends in the stations’ metrics, which make it impossible to find a common direction of changes. Trends in time series averaging the metrics of individual stations indicate a decreasing spread of one-day TCO3 fluctuations in summer seasons using the ground-based data but this is not found in ERA5 data. The increase in intensity and depth of low/high TCO3 areas moving across Europe, expected from global warming, cannot be supported by the present analysis.
Highlights Set of metrics for the short-term total ozone variability in Europe is proposed. Ground-based and ERA5 data provide similar long-term mean values for the metrics. Both negative and positive trends are found in the metrics for the European network. Short-term total ozone variability has not been increasing in Europe since 1980.
Trends in short-term variability of total column ozone over Europe for the period 1980–2020 from the ground-based observations and ERA5 reanalysis
https://orcid.org/0000-0002-3138-3951
Abstract The aim of this study is to analyse daily fluctuations in total column ozone (TCO3) to look for trends in characteristics of the passage of low/high TCO3 systems across Europe in the period 1980–2020. For each season of the year in the period 1980–2020, the sample of one-day change in TCO3 as the percentage of the mean ozone for two consecutive days is calculated for twelve ground-based stations with long-term and frequent TCO3 observations. For comparison purposes, the corresponding ERA5 reanalysis data are also considered. Using the seasonal samples of one-day TCO3 fluctuation, the following metrics for the ozone changes are calculated: standard deviation, frequency of exceeding two arbitrarily selected thresholds (10% and 20% for the absolute value of one-day TCO3 fluctuation), and extremes (minimum and maximum value). Both ground-based and ERA5 data provide similar mean values for these metrics in the period 1980–2020. Statistically significant trends in the metrics are only calculated for ∼10% and ∼5% of cases using the ground-based and ERA5 data, respectively. There are both negative and positive trends in the stations’ metrics, which make it impossible to find a common direction of changes. Trends in time series averaging the metrics of individual stations indicate a decreasing spread of one-day TCO3 fluctuations in summer seasons using the ground-based data but this is not found in ERA5 data. The increase in intensity and depth of low/high TCO3 areas moving across Europe, expected from global warming, cannot be supported by the present analysis.
Highlights Set of metrics for the short-term total ozone variability in Europe is proposed. Ground-based and ERA5 data provide similar long-term mean values for the metrics. Both negative and positive trends are found in the metrics for the European network. Short-term total ozone variability has not been increasing in Europe since 1980.
Trends in short-term variability of total column ozone over Europe for the period 1980–2020 from the ground-based observations and ERA5 reanalysis
https://orcid.org/0000-0002-3138-3951
Abstract The aim of this study is to analyse daily fluctuations in total column ozone (TCO3) to look for trends in characteristics of the passage of low/high TCO3 systems across Europe in the period 1980–2020. For each season of the year in the period 1980–2020, the sample of one-day change in TCO3 as the percentage of the mean ozone for two consecutive days is calculated for twelve ground-based stations with long-term and frequent TCO3 observations. For comparison purposes, the corresponding ERA5 reanalysis data are also considered. Using the seasonal samples of one-day TCO3 fluctuation, the following metrics for the ozone changes are calculated: standard deviation, frequency of exceeding two arbitrarily selected thresholds (10% and 20% for the absolute value of one-day TCO3 fluctuation), and extremes (minimum and maximum value). Both ground-based and ERA5 data provide similar mean values for these metrics in the period 1980–2020. Statistically significant trends in the metrics are only calculated for ∼10% and ∼5% of cases using the ground-based and ERA5 data, respectively. There are both negative and positive trends in the stations’ metrics, which make it impossible to find a common direction of changes. Trends in time series averaging the metrics of individual stations indicate a decreasing spread of one-day TCO3 fluctuations in summer seasons using the ground-based data but this is not found in ERA5 data. The increase in intensity and depth of low/high TCO3 areas moving across Europe, expected from global warming, cannot be supported by the present analysis.
Highlights Set of metrics for the short-term total ozone variability in Europe is proposed. Ground-based and ERA5 data provide similar long-term mean values for the metrics. Both negative and positive trends are found in the metrics for the European network. Short-term total ozone variability has not been increasing in Europe since 1980.
Trends in short-term variability of total column ozone over Europe for the period 1980–2020 from the ground-based observations and ERA5 reanalysis
Krzyścin, Janusz W. (author)
Atmospheric Environment ; 295
2022-12-11
Article (Journal)
Electronic Resource
English
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