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| Titel |
A global tropospheric ozone climatology from trajectory-mapped ozone soundings |
| VerfasserIn |
G. Liu, J. Liu, D. W. Tarasick, V. E. Fioletov, J. J. Jin, O. Moeini, X. Liu, C. E. Sioris, M. Osman |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 13, no. 21 ; Nr. 13, no. 21 (2013-11-04), S.10659-10675 |
| Datensatznummer |
250085785
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| Publikation (Nr.) |
 copernicus.org/acp-13-10659-2013.pdf |
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| Zusammenfassung |
| A global three-dimensional (i.e. latitude, longitude, altitude) climatology
of tropospheric ozone is derived from the ozone sounding record by
trajectory mapping. Approximately 52 000 ozonesonde profiles from more than
100 stations worldwide since 1965 are used. The small number of stations
results in a sparse geographical distribution. Here, forward and backward
trajectory calculations are performed for each sounding to map ozone
measurements to a number of other locations, and so to fill in the spatial
domain. This is possible because the lifetime of ozone in the troposphere is
of the order of weeks. This physically based interpolation method offers
obvious advantages over typical statistical interpolation methods. The
trajectory-mapped ozone values show reasonable agreement, where they
overlap, to the actual soundings, and the patterns produced separately by
forward and backward trajectory calculations are similar. Major regional
features of the tropospheric ozone distribution are clearly evident in the
global maps. An interpolation algorithm based on spherical functions is
further used for smoothing and to fill in remaining data gaps. The resulting
three-dimensional global tropospheric ozone climatology facilitates
visualization and comparison of different years, decades, and seasons, and
offers some intriguing insights into the global variation of tropospheric
ozone. It will be useful for climate and air quality model initialization
and validation, and as an a priori climatology for satellite data retrievals.
Further division of the climatology into decadal and annual averages can
provide a global view of tropospheric ozone changes, although uncertainties
with regard to the performance of older sonde types, as well as more recent
variations in operating procedures, need to be taken into account. |
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