http://www.cnr.it/ontology/cnr/individuo/prodotto/ID168209
Influence of clouds on the spectral actinic flux density in the lower troposphere (INSPECTRO): overview of the field campaigns (Articolo in rivista)
- Type
- Label
- Influence of clouds on the spectral actinic flux density in the lower troposphere (INSPECTRO): overview of the field campaigns (Articolo in rivista) (literal)
- Anno
- 2008-01-01T00:00:00+01:00 (literal)
- Alternative label
Thiel, S., L. Ammannato, A. Bais, B. Bandy, M. Blumthaler, B. Bohn, O. Engelsen, G. P. Gobbi, J. Gröbner, E. Jäkel, W. Junkermann, S. Kazadzis, R. Kift, B. Kjeldstad, N. Kouremeti, A. Kylling, B. Mayer, P. S. Monks, C. E. Reeves, B. Schallhart, R. Sche (2008)
Influence of clouds on the spectral actinic flux density in the lower troposphere (INSPECTRO): overview of the field campaigns
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- Thiel, S., L. Ammannato, A. Bais, B. Bandy, M. Blumthaler, B. Bohn, O. Engelsen, G. P. Gobbi, J. Gröbner, E. Jäkel, W. Junkermann, S. Kazadzis, R. Kift, B. Kjeldstad, N. Kouremeti, A. Kylling, B. Mayer, P. S. Monks, C. E. Reeves, B. Schallhart, R. Sche (literal)
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- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
- Note
- ISI Web of Science (WOS) (literal)
- Titolo
- Influence of clouds on the spectral actinic flux density in the lower troposphere (INSPECTRO): overview of the field campaigns (literal)
- Abstract
- Ultraviolet radiation is the key factor driving
tropospheric photochemistry. It is strongly modulated by
clouds and aerosols. A quantitative understanding of the ra-
diation field and its effect on photochemistry is thus only
possible with a detailed knowledge of the interaction between
clouds and radiation. The overall objective of the
project INSPECTRO was the characterization of the threedimensional
actinic radiation field under cloudy conditions.
This was achieved during two measurement campaigns in
Norfolk (East Anglia, UK) and Lower Bavaria (Germany
combining space-based, aircraft and ground-based measurements
as well as simulations with the one-dimensional radiation
transfer model UVSPEC and the three-dimensional
radiation transfer model MYSTIC.
During both campaigns the spectral actinic flux density
was measured at several locations at ground level and in the
air by up to four different aircraft. This allows the comparison
of measured and simulated actinic radiation profiles. In
addition satellite data were used to complete the information
of the three dimensional input data set for the simulation. A
three-dimensional simulation of actinic flux density data under
cloudy sky conditions requires a realistic simulation of
the cloud field to be used as an input for the 3-D radiation
transfer model calculations. Two different approaches were
applied, to derive high- and low-resolution data sets, with a
grid resolution of about 100m and 1 km, respectively.
The results of the measured and simulated radiation pro-
files as well as the results of the ground based measurements
are presented in terms of photolysis rate profiles for ozone
and nitrogen dioxide. During both campaigns all spectroradiometer
systems agreed within ±10% if mandatory corrections
e.g. stray light correction were applied. Stability
changes of the systems were below 5% over the 4 week campaign
periods and negligible over a few days. The J(O1D)
data of the single monochromator systems can be evaluated
for zenith angles less than 70_, which was satisfied by nearly
all airborne measurements during both campaigns. The comparison
of the airborne measurements with corresponding
simulations is presented for the total, downward and upward
flux during selected clear sky periods of both campaigns. The
compliance between the measured (from three aircraft) and
simulated downward and total flux profiles lies in the range
of ±15%. (literal)
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