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@ARTICLE{Ehhalt:37476,
author = {Ehhalt, D. H. and Rohrer, F. and Schauffler, S. and
Prather, M.},
title = {{O}n the decay of stratospheric pollutants: {D}iagnosing
the longest-lived eigenmode},
journal = {Journal of Geophysical Research},
volume = {109},
issn = {0148-0227},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-37476},
pages = {1 - 9},
year = {2004},
note = {Record converted from VDB: 12.11.2012},
abstract = {[1] On the basis of a one-dimensional (1-D) analysis the
decay time of the lowest eigenmode, tau(1), for the
stratospheric distribution of a conserved tracer is derived
from measured vertical profiles of the mean age of
stratospheric air. Two case studies (a and b) give tau(1,a)
= 3.8 +/- 0.8 years and tau(1,b) = 5.3 +/- 1.1 years. These
semiobservational times are considerably longer than most of
the tau(1) derived from 2-D and 3-D models. At the same time
they are shorter than the observational eigentime,
tau(1,HTO) = 7.7 +/- 2 years, determined from the decay of
the tritium (T) content in stratospheric water vapor,
following the thermonuclear test explosions in the early
1960s. Part of the differences among the observational
eigentimes can be explained by the assumptions that had to
be made to extract tau(1),(HTO) from the trend in the T
content of stratospheric water vapor ( namely, the
cosmogenic background of tritiated water vapor and the trend
in stratospheric water vapor). This leads to a revised value
tau(1,HTO) = 6.3 +/- 0.9 years for the time period
1975-1983. Allowing for a possible temporal trend in Gamma
and hence tau(1), the value for the current tau(1) decreases
to 5.3 +/- 1 years.},
keywords = {J (WoSType)},
cin = {ICG-II},
ddc = {550},
cid = {I:(DE-Juel1)VDB48},
pnm = {Chemie und Dynamik der Geo-Biosphäre},
pid = {G:(DE-Juel1)FUEK257},
shelfmark = {Meteorology $\&$ Atmospheric Sciences},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000221077200001},
doi = {10.1029/2003JD004029},
url = {https://juser.fz-juelich.de/record/37476},
}