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dc.contributor.author
Renner, Maik
dc.contributor.author
Wild, Martin
dc.contributor.author
Schwarz, Matthias
dc.contributor.author
Kleidon, Axel
dc.date.accessioned
2019-10-30T08:19:11Z
dc.date.available
2019-10-27T02:25:00Z
dc.date.available
2019-10-30T08:18:06Z
dc.date.available
2019-10-30T08:19:11Z
dc.date.issued
2019-08
dc.identifier.issn
2333-5084
dc.identifier.other
10.1029/2019EA000686
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/373037
dc.identifier.doi
10.3929/ethz-b-000373037
dc.description.abstract
Estimates of radiative fluxes under cloud‐free conditions (“clear‐sky”) are required in many fields, from climatic analyses of solar transmission to estimates of solar energy potential for electricity generation. Ideally, these fluxes can be obtained directly from measurements of solar fluxes at the surface. However, common standard methods to identify clear‐sky conditions require observations of both the total and the diffuse radiative fluxes at very high temporal resolution of minutes, which restricts these methods to a few, well‐equipped sites. Here we propose a simple method to estimate clear‐sky fluxes only from typically available global radiation measurements (Rsd) at (half‐)hourly resolution. Plotting a monthly sample of observed Rsd against the corresponding incoming solar radiation at the top of atmosphere (potential solar radiation) reveals a typical triangle shape with clear‐sky conditions forming a distinct, linear slope in the upper range of observations. This upper slope can be understood as the fractional transmission of solar radiation representative for cloud‐free conditions of the sample period. We estimate this upper slope through quantile regression. We employ data of 42 stations of the worldwide Baseline Surface Radiation Network to compare our monthly estimates with the standard clear‐sky identification method developed by Long and Ackerman (2000, https://doi.org/10.1029/2000JD900077). We find very good agreement of the derived fractional solar transmission (R2 = 0.73) across sites. These results thus provide confidence in applying the proposed method to the larger set of global radiation measurements to obtain further observational constraints on clear‐sky fluxes and cloud radiative effects.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
American Geophysical Union
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
cloud‐free
en_US
dc.subject
clear‐sky
en_US
dc.subject
global radiation
en_US
dc.subject
transmission
en_US
dc.subject
quantile regression
en_US
dc.title
Estimating Shortwave Clear-Sky Fluxes From Hourly Global Radiation Records by Quantile Regression
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2019-08-09
ethz.journal.title
Earth and Space Science
ethz.journal.volume
6
en_US
ethz.journal.issue
8
en_US
ethz.pages.start
1532
en_US
ethz.pages.end
1546
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.grant
Towards an improved understanding of the Global Energy Balance: temporal variation of solar radiation in the climate system
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.place
Washington, DC
en_US
ethz.publication.status
published
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::03360 - Schär, Christoph / Schär, Christoph
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::03360 - Schär, Christoph / Schär, Christoph
ethz.grant.agreementno
159938
ethz.grant.fundername
SNF
ethz.grant.funderDoi
10.13039/501100001711
ethz.grant.program
Projekte MINT
ethz.date.deposited
2019-10-27T02:25:09Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2019-10-30T08:18:18Z
ethz.rosetta.lastUpdated
2022-03-28T23:59:08Z
ethz.rosetta.versionExported
true
ethz.COinS
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