On the applicability of the Heliosat-2 method to assess surface solar irradiance in the Intertropical Convergence Zone, French Guiana

Marie-Joseph, Isabelle; Linguet, Laurent; Gobinddass, Marie-Line; Wald, Lucien

doi:10.1080/01431161.2012.756598

Cited by 24 publications

(8 citation statements)

References 36 publications

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“…As a consequence, the pixel size in the east-west direction is above 12 km, and as the climate of the Rondônia is tropical with a lot of heavy rains and clouds, the estimation from satellite imagery faces difficulty in modelling accurately the SSI. This was observed by Marie-Joseph et al (2013) for a similar climate in Guiana. Though the number of stations is low compared to IN-MET, the 11 INPE stations are more equi-distributed on the Brazilian territory.…”

Section: Satellite Databasesupporting

confidence: 51%

Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil

et al. 2016

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Abstract. The SoDa website (www.soda-pro.com) is populated with numerous solar-related Web services. Among them, three satellite-derived irradiation databases can be manually or automatically accessed to retrieve radiation values within the geographical coverage of the Meteosat Second Generation (MSG) satellite: the two most advanced versions of the HelioClim-3 database (versions 4 and 5, respectively HC3v4 and HC3v5), and the CAMS radiation service. So far, these databases have been validated against measurements of several stations in Europe and North Africa only. As the quality of such databases depends on the geographical regions and the climates, this paper extends this validation campaign and proposes an extensive comparison on Brazil and global irradiation received on a horizontal surface. Eleven stations from the Brazilian Institute of Space Research (INPE) network offer 1 min observations, and thirty-one stations from the Instituto Nacional de Meteorologia (INMET) network offer hourly observations. The satellite-derived estimates have been compared to the corresponding observations on hourly, daily and monthly basis. The bias relative to the mean of the measurements for HC3v5 is mostly comprised between 1 and 3 %, and that for HC3v4 between 2 and 5 %. These are very satisfactory results and they demonstrate that HC3v5, and to a lesser extent HC3v4, may be used in studies of long-term changes in SSI in Brazil. The situation is not so good with CAMS radiation service for which the relative bias is mostly comprised between 5 and 10 %. For hourly irradiation, the relative RMSE ranges from 15 to 33 %. The correlation coefficient is very large for all stations and the three databases, with an average of 0.96. The three databases reproduce well the hour from hour changes in SSI. The errors show a tendency to increase with the viewing angle of the MSG satellite. They are greater in tropical areas where the relative humidity in the atmosphere is important. It is concluded that except for the overestimation by CAMS radiation service, the three databases are suitable for studies of the solar resources in Brazil.

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Section: Satellite Databasesupporting

confidence: 51%

Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil

et al. 2016

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“…The effects of the parallax are enhanced in the case of fragmented cloud cover, especially when the pixel size is large, which happens for large viewing angles. Marie-Joseph et al (2013) mention that cloud fragmentation may contribute to a larger bias for intermediate skies because of the limited spatial resolution of the Meteosat sensor that prevents one from detecting small broken clouds such as cumulus. This patchwork of small clouds may be interpreted by the sensor and furthermore by the Heliosat-2 method as a large thin cloud.…”

Section: Resultsmentioning

confidence: 99%

Improving HelioClim-3 estimates of surface solar irradiance using the McClear clear-sky model and recent advances in atmosphere composition

Gschwind

Lefèvre

et al. 2014

Atmos. Meas. Tech.

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Abstract. The HelioClim-3 database (HC3v3) provides records of surface solar irradiation every 15 min, estimated by processing images from the geostationary meteorological Meteosat satellites using climatological data sets of the atmospheric Linke turbidity factor. This technical note proposes a method to improve a posteriori HC3v3 by combining it with data records of the irradiation under clear skies from the new McClear clear-sky model, whose inputs are the advanced global aerosol property forecasts and physically consistent total column content in water vapour and ozone produced by the MACC (Monitoring Atmosphere Composition and Climate) projects. The method is validated by comparison with a series of ground measurements for 15 min and 1 h for 6 stations and for daily irradiation for 23 stations. The correlation coefficient is large, greater than respectively 0.92, 0.94, and 0.97, for 15 min, 1 h and daily irradiation. The bias ranges from −4 to 4 % of the mean observed irradiation for most sites. The relative root mean square difference (RMSD) varies between 14 and 38 % for 15 min, 12 and 33 % for 1 h irradiation, and 6 and 20 % for daily irradiation. As a rule of thumb, the farther from the nadir of the Meteosat satellite located at latitude 0 • and longitude 0 • , and the greater the occurrence of fragmented cloud cover, the greater the relative RMSD. The method improves HC3v3 in most cases, and with no degradation in the others. A systematic correction of HC3v3 with McClear is recommended.

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“…Unlike surface albedo, the apparent albedo changes much faster. A change in the apparent albedo, which relates to a change in clouds, would lead to a variation in the signal received by the sensor (Marie‐Joseph et al, ). Thus, an increase in albedo is related to the presence of cloud cover (Beyer et al, ).…”

Section: Calibrated Heliosat Methods For Estimating Dswrmentioning

confidence: 99%

Estimation of Downwelling Shortwave and Longwave Radiation in the Tibetan Plateau Under All‐Sky Conditions

Zhong

Zou

et al. 2019

JGR Atmospheres

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Downwelling shortwave radiation (DSWR) and downwelling longwave radiation (DLWR) are two important components of the Earth's surface radiation balance. In this study, the Heliosat method and the parameterization of Crawford and Duchon (1999, https://doi.org/10.1175/1520‐0450(1999)038<0474:AIPFEE>2.0.CO;2, hereafter CD99) were calibrated to make them suitable for estimation of DSWR and DLWR over the Tibetan Plateau (TP). Based on meteorological data, forcing data, and observations from polar‐orbiting satellites, the cloud albedo was calculated, and the clear‐sky index estimation scheme of the Heliosat method was improved. These improvements were then applied to derive 10‐day DSWR under all‐sky conditions over the TP by combining the clear‐sky shortwave radiation scheme with a clear‐sky index. The coefficient of the CD99 parameterization scheme clear‐sky DLWR was also calibrated, and 10‐day all‐sky DLWR was then determined and validated using ground‐based measurements. The spatiotemporal distributions of DSWR and DLWR were analyzed in detail. The results showed that the modified methods are efficient and applicable for downward radiation retrieval under all‐sky conditions over the TP with a reasonable accuracy. The mean percentage errors for DSWR and DLWR were −4.75% and 0.11%, respectively. The variation in the monthly DSWR (DLWR) showed a convex shape, with a maximum appearing in May (July). The spatial distributions of DLWR showed a southeast‐high and northwest‐low pattern. As the subsolar point moves northward, DSWR increases gradually and is clearly influenced by the Asian summer monsoon.

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On the applicability of the Heliosat-2 method to assess surface solar irradiance in the Intertropical Convergence Zone, French Guiana

Cited by 24 publications

References 36 publications

Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil

Validation of three satellite-derived databases of surface solar radiation using measurements performed at 42 stations in Brazil

Improving HelioClim-3 estimates of surface solar irradiance using the McClear clear-sky model and recent advances in atmosphere composition

Estimation of Downwelling Shortwave and Longwave Radiation in the Tibetan Plateau Under All‐Sky Conditions

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