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@ARTICLE{Smit:185733,
author = {Smit, Herman G.J. and Rohs, S. and Neis, P. and Boulanger,
D. and Krämer, M. and Wahner, A. and Petzold, A.},
title = {{T}echnical {N}ote: {R}eanalysis of upper troposphere
humidity data from the {MOZAIC} programme for the period
1994 to 2009},
journal = {Atmospheric chemistry and physics},
volume = {14},
number = {23},
issn = {1680-7324},
address = {Katlenburg-Lindau},
publisher = {EGU},
reportid = {FZJ-2014-07158},
pages = {13241 - 13255},
year = {2014},
abstract = {In situ observational data on the relative humidity (RH) in
the upper troposphere and lowermost stratosphere (UT/LS), or
tropopause region, collected aboard civil passenger aircraft
in the MOZAIC (Measurements of OZone, water vapour, carbon
monoxide and nitrogen oxides by in-service AIrbus airCraft)
programme were reanalysed for the period 2000 to 2009.
Previous analyses of probability distribution functions
(PDFs) of upper troposphere humidity (UTH) data from MOZAIC
observations from year 2000 and later indicated a bias of
UTH data towards higher RH values compared to data of the
period 1994 to 1999. As a result, the PDF of UTH data show a
substantial fraction of observations above $100\%$ relative
humidity with respect to liquid water. Such
supersaturations, however, do not occur in the atmosphere
because there is always a sufficient number of condensation
nuclei available, that trigger condensation as soon as
liquid saturation is slightly exceeded. An in-depth
reanalysis of the data set identified a coding error in the
calibration procedure from year 2000 on. The error did not
affect earlier data from 1994 to 1999. The full data set for
2000–2009 was reanalysed applying the corrected
calibration procedure. Applied correction schemes and a
revised error analysis are presented along with the
reanalysed PDF of relative humidity with respect to liquid
water (RHliquid) and ice (RHice).},
cin = {IEK-7 / IEK-8},
ddc = {550},
cid = {I:(DE-Juel1)IEK-7-20101013 / I:(DE-Juel1)IEK-8-20101013},
pnm = {234 - Composition and Dynamics of the Upper Troposphere and
Stratosphere (POF2-234) / 233 - Trace gas and aerosol
processes in the troposphere (POF2-233) / HITEC - Helmholtz
Interdisciplinary Doctoral Training in Energy and Climate
Research (HITEC) (HITEC-20170406)},
pid = {G:(DE-HGF)POF2-234 / G:(DE-HGF)POF2-233 /
G:(DE-Juel1)HITEC-20170406},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000346140100038},
doi = {10.5194/acp-14-13241-2014},
url = {https://juser.fz-juelich.de/record/185733},
}