Tropospheric Ozone Assessment Report: Global Ozone Metrics for Climate Change, Human Health, Crop and Ecosystem Research

The paper outlines the development of 25 tropospheric ozone metrics categorized by their application to model-measurement comparison, the free troposphere, human health, and vegetation. It emphasizes the necessity of using biologically defensible metrics and robust statistical methods, specifically the Mann-Kendall test and Theil-Sen estimator, to ensure consistency across thousands of global monitoring sites. A critical finding is that different metrics derived from the same ozone time-series can produce divergent trend patterns and conclusions regarding the effects of ozone variability drivers, such as precursor emissions, on health and vegetation exposure.

• The research identifies 25 distinct tropospheric ozone metrics divided into four categories: 4 for model-measurement comparison, 5 for characterizing ozone in the free troposphere, 11 for human health impacts, and 5 for vegetation impacts.
• To ensure robust and consistent analysis of temporal trends across thousands of global monitoring sites, the study utilized the non-parametric Mann-Kendall test to identify significant trends and the Theil-Sen estimator to determine the magnitude of those trends.
• The selection of different metrics can lead to dissimilar conclusions about how drivers of ozone variability, such as precursor emissions, affect health and vegetation, because different metrics can result in different trend patterns even when calculated from the same time-series.

APA

Stockholm Environment Institute (2018). Tropospheric Ozone Assessment Report: Global Ozone Metrics for Climate Change, Human Health, Crop and Ecosystem Research. https://www.sei.org/publications/tropospheric-ozone-assessment-report-global-ozone-metrics-climate-change-human-health-crop-ecosystem-research/

Chicago

Stockholm Environment Institute. Tropospheric Ozone Assessment Report: Global Ozone Metrics for Climate Change, Human Health, Crop and Ecosystem Research. 2018. https://www.sei.org/publications/tropospheric-ozone-assessment-report-global-ozone-metrics-climate-change-human-health-crop-ecosystem-research/.

Wikipedia

{{cite report |author=Stockholm Environment Institute |title=Tropospheric Ozone Assessment Report: Global Ozone Metrics for Climate Change, Human Health, Crop and Ecosystem Research |date=6 April 2018 |url=https://www.sei.org/publications/tropospheric-ozone-assessment-report-global-ozone-metrics-climate-change-human-health-crop-ecosystem-research/ |access-date=17 August 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{stockholmenvironmentinstitute2018tropospheric, author = {{Stockholm Environment Institute}}, title = {{Tropospheric Ozone Assessment Report: Global Ozone Metrics for Climate Change, Human Health, Crop and Ecosystem Research}}, institution = {Stockholm Environment Institute}, year = {2018}, month = apr, url = {https://www.sei.org/publications/tropospheric-ozone-assessment-report-global-ozone-metrics-climate-change-human-health-crop-ecosystem-research/}, urldate = {2026-08-17}, note = {Indexed by Climate Insights Directory} }