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@ARTICLE{McKenzie:34180,
author = {McKenzie, R. and Johnston, P. and Hofzumahaus, A. and
Kraus, A. and Madronich, S. and Cantrell, C. and Calvert, J.
and Shetter, R.},
title = {{R}elationship between photolysis frequencies derived from
spectroscopic measurements of actinic fluxes and irradiances
during the {IPMMI} campaign},
journal = {Journal of geophysical research / Atmospheres},
volume = {107},
issn = {0022-1406},
address = {Washington, DC},
publisher = {Union},
reportid = {PreJuSER-34180},
pages = {ACH 1-1 - ACH 1-16},
year = {2002},
note = {Record converted from VDB: 12.11.2012},
abstract = {[1] The relationship between photolysis frequencies derived
from spectroscopic measurements of actinic fluxes and
irradiances was determined during a coordinated measurement
campaign (International Photolysis Frequency Measurement and
Modeling Intercomparison campaign (IPMMI)). When differences
in viewing geometries are taken into account, the
measurements are in close agreement. An empirical
relationship, which is useful for high sun (noon) conditions
or for daily integrals, was found to convert irradiance data
to photolysis frequencies. For low-sun conditions (large
solar zenith angle), model calculations were shown to
improve the accuracy. However, the input parameters to the
model are site specific and the conversion depends on
diffuse/direct ratios. During cloudy conditions, significant
improvements in the conversion can be achieved by assuming
the radiation field to comprise entirely diffuse isotropic
radiation when the UVA transmission by cloud is less than
0.8. Changing cloud conditions remain the greatest
limitation, but they tend to bias the results away from the
clear-sky case in a systematic way. Furthermore, although
the cloud effects on the photolysis rates of nitrogen
dioxide (J(NO2)) are rather large, they are much smaller for
ozone photolysis (J(O-3 --> O(D-1))), which is of prime
importance in tropospheric chemistry. The study shows the
potential for deriving historical and geographical
differences in actinic fluxes from the extensive records of
ground-based measurements of spectral irradiance.},
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:000178892700009},
doi = {10.1029/2001JD000601},
url = {https://juser.fz-juelich.de/record/34180},
}