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| Titel |
Radiation closure under broken cloud conditions at the BSRN site Payerne: A case study |
| VerfasserIn |
Christine Aebi, Julian Gröbner, Niklaus Kämpfer, Laurent Vuilleumier |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149898
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| Publikation (Nr.) |
 EGU/EGU2017-14295.pdf |
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| Zusammenfassung |
| Clouds have a substantial influence on the surface radiation budget and on the climate system.
There are several studies showing the opposing effect of clouds on shortwave and longwave
radiation and thus on the global energy budget.
Wacker et al., 2013 show an agreement between radiation flux measurements and
radiative transfer models (RTM) under clear sky conditions which is within the measurement
uncertainty. Our current study combines radiation fluxes from surface-based observations
with RTM under cloudy conditions. It is a case study with data from the BSRN (Baseline
Surface Radiation Network) site Payerne (46.49˚ N, 6.56˚ E, 490 m asl). Observation data
are retrieved from pyranometers and pyrgeometers and additional atmospheric parameters
from radiosondes and a ceilometer. The cloud information is taken from visible
all-sky cameras. In a first step observations and RTM are compared for cases with
stratiform overcast cloud conditions. In a next step radiation fluxes are compared
under broken cloud conditions. These analyses are performed for different cloud
types.
Wacker, S., J. Gröbner, and L. Vuilleumier (2014) A method to calculate cloud-free
long-wave irradiance at the surface based on radiative transfer modeling and temperature
lapse rate estimates, Theor. Appl. Climatol., 115, 551–561. |
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