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@ARTICLE{Holland:33393,
author = {Holland, F. and Hofzumahaus, A. and Schäfer, H.-J. and
Kraus, A. and Pätz, H.-W.},
title = {{M}easurements of {OH} and {HO}2 radical concentrations and
photolysis frequencies during {BERLIOZ}},
journal = {Journal of Geophysical Research},
volume = {108},
issn = {0148-0227},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-33393},
pages = {D4},
year = {2003},
note = {Record converted from VDB: 12.11.2012},
abstract = {[1] This paper presents the measurements of OH and HO2
radical concentrations as well as photolysis frequencies of
different molecules during the Berliner Ozone (BERLIOZ)
field experiment in July/August 1998 at the rural site
Pabstthum about 50 km NW of Berlin. Radical concentrations
were measured using laser-induced fluorescence (LIF)
spectroscopy, while filter radiometers and a scanning
spectroradiometer were used to obtain photolysis
frequencies. The radical data set covers the time period
from 20 July to 6 August and consists of more than 6000
simultaneous measurements of OH and HO2 with a typical time
resolution of about 90 s. The maximum OH and HO2 daytime
concentrations were 8 x 10(6) and 8 x 10(8) cm(-3),
respectively. While nighttime values of OH were usually
below the detection limit of our instrument (3.5 x 10(5)
cm(-3)), HO2 did show significant concentrations throughout
most of the nights (on average 3 x 10(7) cm(-3)). The OH
concentration was mainly controlled by solar UV radiation
and showed a high linear correlation with J(O-1 D). A
deviation from this general behavior was observed around
dawn and dusk, when OH concentrations well above the
detection limit were observed, although J(O-1 D) was
essentially zero. A comparison with data sets from previous
campaigns revealed that even though the linear correlation
is found in other environments as well the slope [OH]/ J(O-1
D) differs significantly. The diurnal cycles of HO2 were
less dependent on the solar actinic flux but were
predominantly influenced by NO. During episodes of high NO,
HO2 remained below the detection limit (1 x 10(7) cm(-3))
but started to rise rapidly as soon as NO started to
decrease.},
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:000181500200001},
doi = {10.1029/2001JD001393},
url = {https://juser.fz-juelich.de/record/33393},
}