Decrease in tropospheric O&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; levels of the Northern Hemisphere observed by IASI

Wespes, Catherine; Hurtmans, Daniel; Clerbaux, Cathy; Boynard, Anne; Coheur, Pierre‐François

doi:10.5194/acp-2017-904

Cited by 1 publication

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“…The sensitivity of IASI in the troposphere maximizes around 4-8 km for most scenes. Negative ozone trends in the troposphere at mid-high northern latitudes have been reported, especially in summer (Wespes et al, 2018). For the present study, the daily tropopause height used to generate the IASI-FORLI TCO dataset relies on the WMO definition applied to the IASI level 2 temperature profiles provided through the Eumetcast operational processing system (August et al, 2012).…”

Section: Iasi-forlimentioning

confidence: 99%

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

Gaudel

Cooper

Ancellet

et al. 2018

Elementa: Science of the Anthropocene

353

367

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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.

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Section: Iasi-forlimentioning

confidence: 99%

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

Gaudel

Cooper

Ancellet

et al. 2018

Elementa: Science of the Anthropocene

353

367

View full text Add to dashboard Cite

show abstract

Decrease in tropospheric O<sub>3</sub> levels of the Northern Hemisphere observed by IASI

Abstract: 10In this study, we describe the recent changes in the tropospheric ozone (O3) columns (TOCs)

Cited by 1 publication

References 54 publications

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

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

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