• DOI:10.1525/ELEMENTA.291
• Corpus ID: 52834182

Tropospheric Ozone Assessment Report: Present-day distribution and trends of tropospheric ozone relevant to climate and global atmospheric chemistry model evaluation

@inproceedings{Gaudel2018TroposphericOA,
  title={Tropospheric Ozone Assessment Report: Present-day distribution and trends of tropospheric ozone relevant to climate and global atmospheric chemistry model evaluation},
  author={Audrey Gaudel and Owen R. Cooper and G{\'e}rard Ancellet and Brice Barret and Anne Boynard and John Philip Burrows and Cathy Clerbaux and Pierre‐François Coheur and Juan Cuesta and Emilio Cuevas and Stamatia Doniki and Ga{\"e}lle Dufour and Felix Ebojie and Gilles Foret and Omaira Elena Garc{\'i}a and M. J. Granados Mu{\~n}os and James W. Hannigan and Frank Hase and Guanyu Huang and Birgit Hassler and Daniel Hurtmans and Daniel A. Jaffe and Nicholas Brian Jones and Pavlos Kalabokas and Brian J. Kerridge and Susan Sund Kulawik and Barry L. Latter and Thierry Leblanc and Eric Le Flochmo{\"e}n and W.L. Lin and Jane Liu and Xiong Liu and Emmanuel Mahieu and Audra McClure–Begley and Jessica L. Neu and Mohammed K. Osman and Mathias Palm and Herv{\'e} Petetin and Irina Petropavlovskikh and Richard R. Querel and Nabiz Rahpoe and Alexei V. Rozanov and Martin G. Schultz and James J. Schwab and Richard Siddans and Dan Smale and Martin Steinbacher and Hiroshi Tanimoto and David W. Tarasick and Val{\'e}rie Thouret and Anne M. Thompson and Thomas Trickl and Catherine Wespes and Helen M. Worden and Corinne Vigouroux and Xiaobin Xu and Guang Zeng and Jerald R. Ziemke},
  year={2018}
}

• A. Gaudel, O. Cooper, +55 authors J. Ziemke
• Published 10 May 2018
• Environmental Science

The Tropospheric Ozone Assessment Report (TOAR) is an activity of the International Global Atmospheric Chemistry Project. This paper is a component of the report, focusing on the present-day distribution and trends of tropospheric ozone relevant to climate and global atmospheric chemistry model evaluation. Utilizing the TOAR surface ozone database, several figures present the global distribution and trends of daytime average ozone at 2702 non-urban monitoring sites, highlighting the regions and seasons of the world with the greatest ozone levels. Similarly, ozonesonde and commercial aircraft observations reveal ozone’s distribution throughout the depth of the free troposphere. Long-term surface observations are limited in their global spatial coverage, but data from remote locations indicate that ozone in the 21st century is greater than during the 1970s and 1980s. While some remote sites and many sites in the heavily polluted regions of East Asia show ozone increases since 2000, many others show decreases and there is no clear global pattern for surface ozone changes since 2000. Two new satellite products provide detailed views of ozone in the lower troposphere across East Asia and Europe, revealing the full spatial extent of the spring and summer ozone enhancements across eastern China that cannot be assessed from limited surface observations. Sufficient data are now available (ozonesondes, satellite, aircraft) across the tropics from South America eastwards to the western Pacific Ocean, to indicate a likely tropospheric column ozone increase since the 1990s. The 2014–2016 mean tropospheric ozone burden (TOB) between 60˚N–60˚S from five satellite products is 300 Tg ± 4%. While this agreement is excellent, the products differ in their quantification of TOB trends and further work is required to reconcile the differences. Satellites can now estimate ozone’s global long-wave radiative effect, but evaluation is difficult due to limited in situ observations where the radiative effect is greatest.