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dc.contributor.author
Nowak, Daniela
dc.contributor.author
Vuilleumier, Laurent
dc.contributor.author
Ohmura, Atsumu
dc.date.accessioned
2022-06-22T12:55:02Z
dc.date.available
2017-06-08T20:41:00Z
dc.date.available
2019-09-09T12:00:59Z
dc.date.available
2022-06-22T12:55:02Z
dc.date.issued
2008-06-11
dc.identifier.issn
1680-7375
dc.identifier.issn
1680-7367
dc.identifier.other
10.5194/acpd-8-11453-2008
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/12551
dc.identifier.doi
10.3929/ethz-b-000012551
dc.description.abstract
Clouds represent a major source of uncertainty in understanding climate change, because potential changes in the way they affect the atmospheric and surface energy budget are difficult to predict. It is therefore important to determine how clouds affect radiation. Stratiform clouds in particular have an important effect on climate as they cover large areas. This article presents results of radiation transfer calculations with MODTRANTM for well-defined stratus cloud cases detected at the meteorological station of Payerne, Switzerland. These stratus situations are selected in a data set covering the years from 2000 to 2005 with a method using data widely available at national meteorological observing stations. For 18 single layer stratus situations the shortwave radiation fluxes calculated with MODTRANTM are compared to surface observations from the Baseline Surface Radiation Network (BSRN) site at Payerne and top of atmosphere (TOA) observations from the Clouds and the Earth's Radiant Energy System (CERES) experiment. A median bias on the order of 20 Wm−2 (<9%) was found for the differences between modeled and observed reflected solar radiation at TOA. At the surface, good agreement is obtained by adjusting the vertical extinction in the modeled cloud layer within reasonable limits for a stratus cloud: The median bias of modeled minus observed shortwave downward radiation is well within instrument precision (<1%). The simultaneous agreement of modeled and observed radiation fluxes at the surface and TOA confirmed that radiation transfer in the atmosphere including a single cloud layer can be well simulated with MODTRANTM. Based on the present results, the absorbance was calculated within the stratus cloud layer (cloud base to cloud top). For the 18 single stratus layer situations the median absorbance is 0.07 [minimum 0.04, maximum 0.1], the median transmittance is 0.29 [0.15 0.39], and the median cloud reflectance is 0.70 [0.63, 0.80].
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Copernicus
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/3.0/
dc.title
Radiation transfer in stratus clouds at the BSRN Payerne site
en_US
dc.type
Working Paper
dc.rights.license
Creative Commons Attribution 3.0 Unported
ethz.journal.title
Atmospheric Chemistry and Physics Discussions
ethz.journal.volume
8
en_US
ethz.journal.issue
3
en_US
ethz.journal.abbreviated
Atmos. chem. phys. discuss.
ethz.pages.start
11453
en_US
ethz.pages.end
11485
en_US
ethz.notes
This preprint was under review for the journal "Atmospheric Chemistry and Physics" but the revision was not accepted.
en_US
ethz.publication.place
Göttingen
en_US
ethz.publication.status
published
en_US
ethz.leitzahl
03208 - Ohmura, Atsumu
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03778 - Seneviratne, Sonia / Seneviratne, Sonia
en_US
ethz.leitzahl.certified
03208 - Ohmura, Atsumu
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02350 - Dep. Umweltsystemwissenschaften / Dep. of Environmental Systems Science::02717 - Institut für Atmosphäre und Klima / Inst. Atmospheric and Climate Science::03778 - Seneviratne, Sonia / Seneviratne, Sonia
ethz.date.deposited
2017-06-08T20:41:23Z
ethz.source
ECIT
ethz.identifier.importid
imp59364c1983fa631313
ethz.ecitpid
pub:23881
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2017-07-19T10:41:20Z
ethz.rosetta.lastUpdated
2019-09-09T12:01:11Z
ethz.rosetta.exportRequired
true
ethz.rosetta.versionExported
true
ethz.COinS
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