Journal of Earth Science & Climatic Change
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Ozone is an important trace gas in the atmosphere, playing a significant role in atmospheric chemical, dynamical, and
radiative processes. It is also a major pollutant. In this presentation, a three-dimensional (latitude, longitude, altitude)
climatology of tropospheric and stratospheric ozone is presented. This ozone climatology is derived from the global ozonesonde
sounding record comprising 51 898 profiles at 116 stations over 44 yr (1965-2008), by a domain-filling trajectory mapping
method. The trajectory technique provides a powerful tool to integrate sparse ozonesonde measurements, by filling in the
spatial domain. This physically-based trajectory mapping method offers evident advantages over typical statistical interpolation
This ozone climatology is latitudinally, longitudinally, and vertically resolved and it offers more complete high latitude
coverage as well as a much longer record than current satellite data. As the climatology depends on neither a priori data
nor photochemical modeling, it provides independent information and insight that can supplement satellite data and model
simulations of stratospheric ozone.
One of the objectives to create this ozone climatology is for trend analysis. The climatology clearly shows the depletion
of ozone from the 1970s to the mid 1990s and ozone increases until the middle of the 2000s in the lower stratosphere. The
ozone trends over the globe, the Arctic, and the Antarctic are analyzed by season. All regions show ozone depletion from the
1970s to the 1990s and ozone increases until the middle of the 2000s. The decadal variation is larger in the winter season than
in the summer season in both hemispheres, presumably because of chemical ozone loss in polar winter. Ozone trends in the
troposphere over North America will also be discussed.
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