Tropospheric ozone assessment report: Present-day tropospheric ozone distribution and trends relevant to vegetation
Artikel i vetenskaplig tidskrift, 2018

This Tropospheric Ozone Assessment Report (TOAR) on the current state of knowledge of ozone metrics of relevance to vegetation (TOAR-Vegetation) reports on present-day global distribution of ozone at over 3300 vegetated sites and the long-term trends at nearly 1200 sites. TOAR-Vegetation focusses on three metrics over vegetation-relevant time-periods across major world climatic zones: M12, the mean ozone during 08:00-19:59; AOT40, the accumulation of hourly mean ozone values over 40 ppb during daylight hours, and W126 with stronger weighting to higher hourly mean values, accumulated during 08:00-19:59. Although the density of measurement stations is highly variable across regions, in general, the highest ozone values (mean, 2010-14) are in mid-latitudes of the northern hemisphere, including southern USA, the Mediterranean basin, northern India, north, north-west and east China, the Republic of Korea and Japan. The lowest metric values reported are in Australia, New Zealand, southern parts of South America and some northern parts of Europe, Canada and the USA. Regional-scale assessments showed, for example, significantly higher AOT40 and W126 values in East Asia (EAS) than Europe (EUR) in wheat growing areas (p < 0.05), but not in rice growing areas. In NAM, the dominant trend during 1995-2014 was a significant decrease in ozone, whilst in EUR it was no change and in EAS it was a significant increase. TOAR-Vegetation provides recommendations to facilitate a more complete global assessment of ozone impacts on vegetation in the future, including: an increase in monitoring of ozone and collation of field evidence of the damaging effects on vegetation; an investigation of the effects on peri-urban agriculture and in mountain/upland areas; inclusion of additional pollutant, meteorological and inlet height data in the TOAR dataset; where not already in existence, establishing new region-specific thresholds for vegetation damage and an innovative integration of observations and modelling including stomatal uptake of the pollutant.








Gina Mills

UK Centre For Ecology & Hydrology (UKCEH)

Göteborgs universitet

Håkan Pleijel

Göteborgs universitet

Christopher S. Malley

University of Edinburgh

University of York

UK Centre For Ecology & Hydrology (UKCEH)

Baerbel Sinha

Indian Institute of Science

O.R. Cooper

University of Colorado at Boulder

Martin Schultz

Forschungszentrum Jülich

Howard S. Neufeld

Appalachian State University

David Simpson

Chalmers, Rymd-, geo- och miljövetenskap, Mikrovågs- och optisk fjärranalys

Meteorologisk institutt

Katrina Sharps

UK Centre For Ecology & Hydrology (UKCEH)

Zhaozhong Feng

Chinese Academy of Sciences

G. Gerosa

Università Cattolica del Sacro Cuore

Harry Harmens

UK Centre For Ecology & Hydrology (UKCEH)

Kazuhiko Kobayashi

University of Tokyo

Pallavi Saxena

Jawaharlal Nehru University

Elena Paoletti

Istituto per la Protezione Sostenibile delle Piante, Consiglio Nazionale delle Ricerche

Vinayak Sinha

Indian Institute of Science

Xiaobin Xu

Chinese Academy of Meteorological Sciences (CAMS)


2325-1026 (eISSN)

Vol. 6 47







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