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Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3

Gschwind, Benoit and Wald, Lucien and Blanc, Philippe and Lefevre, M and Schroedter-Homscheidt, Marion and Arola, Antti (2019) Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3. Meteorologische Zeitschrift, 28 (2). Borntraeger Science Publishers. DOI: 10.1127/metz/2019/0946 ISSN 0941-2948

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Official URL: https://www.schweizerbart.de/papers/metz/detail/28/90593/Improving_the_McClear_model_estimating_the_downwelling_solar_radiation_at_ground_level_in_cloud_free_conditions_McClear_v3


The fast McClear clear-sky model estimates the downwelling shortwave direct and diffuse irradiances received at ground level under cloud-free conditions. Several improvements are presented. They focus on the modeling of changes in irradiances with the solar zenithal angle and on a better exploitation of the aerosol properties offered by the Copernicus Atmosphere Monitoring Service (CAMS). Irradiances from this new version McClear-v3 were compared to 1 min measurements made in cloud-free conditions at 11 stations belonging to the Baseline Surface Radiation Network and being located in various climates. The correlation coefficient ranges between 0.982 and 0.999 for the global irradiance. The bias is positive (overestimation) and ranges between 1 W m−2 (0.1 % of the mean observed irradiance) and 20 W m−2 (3.2 %), with the exception of Barrow in Alaska (18 W m−2). The standard deviation ranges between 16 W m−2 (2.3 %) and 30 W m−2 (3.8 %). The correlation coefficient for the direct irradiance ranges between 0.902 and 0.995. As expected, since the direct in McClear does not comprise any circumsolar contribution, the bias is negative (underestimation) and ranges between 49 W m−2 (7.7 %) and 5 W m−2 (0.7 %), with two exceptions: Sede Boqer (79 W m−2) and Brasilia (13 W m−2). The standard deviation is comprised between 34 W m−2 (5.3 %) and 69 W m−2 (10.7 %). These results are similar to those obtained with McClear version 2. Compared to the latter, McClear-v3 removes several artifacts and its estimates are continuous in space and time.

Item URL in elib:https://elib.dlr.de/127883/
Document Type:Article
Title:Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear-v3
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Gschwind, BenoitMines ParisTechUNSPECIFIED
Wald, LucienMines ParisTechUNSPECIFIED
Blanc, PhilippeMines ParisTechUNSPECIFIED
Lefevre, MMines ParisTechUNSPECIFIED
Schroedter-Homscheidt, Marionmarion.schroedter-homscheidt (at) dlr.dehttps://orcid.org/0000-0002-1854-903X
Date:25 March 2019
Journal or Publication Title:Meteorologische Zeitschrift
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
DOI :10.1127/metz/2019/0946
Publisher:Borntraeger Science Publishers
Keywords:solar radiation, clear-sky model, aerosol, CAMS, BSRN
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Systems Analysis and Technology Assessment
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems
Deposited By: Schroedter-Homscheidt, Marion
Deposited On:05 Aug 2019 17:31
Last Modified:28 Oct 2019 10:51

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