In:
Atmospheric Chemistry and Physics, Copernicus GmbH, Vol. 18, No. 9 ( 2018-05-07), p. 6427-6440
Kurzfassung:
Abstract. This paper is focusing on the representativeness of single lidar stations for
zonally averaged ozone profile variations over the middle and upper
stratosphere. From the lower to the upper stratosphere, ozone profiles from
single or grouped lidar stations correlate well with zonal means calculated
from the Solar Backscatter Ultraviolet Radiometer (SBUV) satellite
overpasses. The best representativeness with significant correlation
coefficients is found within ±15∘ of latitude circles north or
south of any lidar station. This paper also includes a multivariate linear regression (MLR) analysis on the
relative importance of proxy time series for explaining variations in the
vertical ozone profiles. Studied proxies represent variability due to
influences outside of the earth system (solar cycle) and within the earth
system, i.e. dynamic processes (the Quasi Biennial Oscillation, QBO; the
Arctic Oscillation, AO; the Antarctic Oscillation, AAO; the El Niño
Southern Oscillation, ENSO), those due to volcanic aerosol (aerosol optical
depth, AOD), tropopause height changes (including global warming) and those
influences due to anthropogenic contributions to atmospheric chemistry (equivalent effective
stratospheric chlorine, EESC). Ozone trends are
estimated, with and without removal of proxies, from the total available 1980
to 2015 SBUV record. Except for the chemistry related proxy (EESC) and its
orthogonal function, the removal of the other proxies does not alter the
significance of the estimated long-term trends. At heights above 15 hPa an
“inflection point” between 1997 and 1999 marks the end of significant
negative ozone trends, followed by a recent period between 1998 and 2015 with
positive ozone trends. At heights between 15 and 40 hPa the pre-1998
negative ozone trends tend to become less significant as we move towards
2015, below which the lower stratosphere ozone decline continues in agreement
with findings of recent literature.
Materialart:
Online-Ressource
ISSN:
1680-7324
DOI:
10.5194/acp-18-6427-2018
Sprache:
Englisch
Verlag:
Copernicus GmbH
Publikationsdatum:
2018
ZDB Id:
2092549-9
ZDB Id:
2069847-1
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