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Detection and classification of laminae in balloon-borne ozonesonde profiles: application to the long-term record from Boulder, Colorado
Ist Teil von
Atmospheric chemistry and physics, 2019-02, Vol.19 (3), p.1853-1865
Ort / Verlag
Katlenburg-Lindau: Copernicus GmbH
Erscheinungsjahr
2019
Link zum Volltext
Quelle
EZB Free E-Journals
Beschreibungen/Notizen
We quantify ozone variability in the upper troposphere and lower stratosphere (UTLS) by
investigating lamination features in balloon measurements of ozone mixing
ratio and potential temperature. Laminae are defined as stratified variations
in ozone that meet or exceed a 10 % threshold for deviations from a basic
state vertical profile of ozone. The basic state profiles are derived for
each sounding using smoothing methods applied within a vertical coordinate
system relative to the World Meteorological Organization (WMO) tropopause. We
present results of this analysis for the 25-year record of ozonesonde
measurements from Boulder, Colorado. The mean number of ozone laminae
identified per sounding is about 9±2 (1σ). The root-mean-square
relative amplitude is 20 %, and laminae with much larger amplitudes (>40 %) are seen in ∼ 2 % of the profiles. The vertical scale of
detected ozone laminae typically ranges between 0.5 and 1.2 km. The lamina
occurrence frequency varies significantly with altitude and is largest within
∼2 km of the tropopause. Overall, ozone laminae identified in our
analysis account for more than one-third of the total intra-seasonal
variability in ozone. A correlation technique between ozone and potential
temperature is used to classify the subset of ozone laminae that are
associated with gravity wave (GW) phenomena, which accounts for 28 % of
all laminar ozone features. The remaining 72 % of laminae arise from
non-gravity wave (NGW) phenomena. There are differences in both the vertical
distribution and seasonality of GW versus NGW ozone laminae that are linked
to the contrast in main generating mechanisms for each laminae type.