Lucien Wald
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View article: On the Assessment of Hourly Means of Solar Irradiance at Ground Level in Clear-Sky Conditions by the ERA5, JRA-3Q, and MERRA-2 Reanalyses
On the Assessment of Hourly Means of Solar Irradiance at Ground Level in Clear-Sky Conditions by the ERA5, JRA-3Q, and MERRA-2 Reanalyses Open
Meteorological reanalyses are one of the means to assess the solar irradiance reaching the ground. This paper deals with estimates of the hourly means of irradiance in clear-sky conditions provided by the ERA5, JRA-3Q, and MERRA-2 reanalys…
View article: On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions
On the Relationships between Clear-Sky Indices in Photosynthetically Active Radiation and Broadband Ranges in Overcast and Broken-Cloud Conditions Open
Several studies proposed relationships linking irradiances in the photosynthetically active radiation (PAR) range and broadband irradiances. A previous study published in 2024 by the same authors proposes a linear model relating clear-sky …
View article: Evidence of linear relationships between clear‑sky indices in photosynthetically active radiation and broadband ranges
Evidence of linear relationships between clear‑sky indices in photosynthetically active radiation and broadband ranges Open
This study provides empirical relationships between photosynthetically active radiation (PAR) and broadband clear‑sky indices at ground level for both the PAR global irradiance and its direct component. Once multiplied by the irradiance in…
View article: Further validation of the estimates of the downwelling solar radiation at ground level in cloud-free conditions provided by the McClear service: the case of Sub-Saharan Africa and the Maldives Archipelago
Further validation of the estimates of the downwelling solar radiation at ground level in cloud-free conditions provided by the McClear service: the case of Sub-Saharan Africa and the Maldives Archipelago Open
Being part of the Copernicus Atmosphere Monitoring Service (CAMS), the McClear service provides estimates of the downwelling shortwave irradiance and its direct and diffuse components received at ground level in cloud-free conditions, with…
View article: Comment on egusphere-2022-1023
Comment on egusphere-2022-1023 Open
Abstract. Being itself part of the Copernicus Atmosphere Monitoring Service (CAMS), the McClear service provides estimates of the downwelling shortwave irradiance and its direct and diffuse components received at ground level in cloud-free…
View article: Further validation of the McClear estimates of the downwelling solar radiation at ground level in cloud-free conditions: The case of the Sub-Saharan Africa and Maldives Archipelago
Further validation of the McClear estimates of the downwelling solar radiation at ground level in cloud-free conditions: The case of the Sub-Saharan Africa and Maldives Archipelago Open
Being itself part of the Copernicus Atmosphere Monitoring Service (CAMS), the McClear service provides estimates of the downwelling shortwave irradiance and its direct and diffuse components received at ground level in cloud-free condition…
View article: Using Copernicus Atmosphere Monitoring Service (CAMS) Products to Assess Illuminances at Ground Level under Cloudless Conditions
Using Copernicus Atmosphere Monitoring Service (CAMS) Products to Assess Illuminances at Ground Level under Cloudless Conditions Open
Natural daylight is recognized as an important variable in the energy performance of buildings. A method that estimates the global illuminance received on a horizontal surface at ground level and its direct component at normal incidence un…
View article: Performance of CAMS Radiation Service and HelioClim-3 databases of solar radiation at surface: evaluating the spatial variation in Germany
Performance of CAMS Radiation Service and HelioClim-3 databases of solar radiation at surface: evaluating the spatial variation in Germany Open
The present work deals with the spatial consistency of two well-known databases of solar radiation received at ground level: the CAMS Radiation Service database version 3.2, abbreviated as CAMS-Rad and the HelioClim-3 database version 5, a…
View article: Advancing climate services for the European renewable energy sector through capacity building and user engagement
Advancing climate services for the European renewable energy sector through capacity building and user engagement Open
The development of successful climate services faces a number of challenges, including the identification of the target audience and their needs and requirements, and the effective communication of complex climate information, through enga…
View article: Which variables are essential for renewable energies?
Which variables are essential for renewable energies? Open
International audience
View article: Assessment of five different methods for the estimation of surface photosynthetically active radiation from satellite imagery at three sites – application to the monitoring of indoor soft fruit crops in southern UK
Assessment of five different methods for the estimation of surface photosynthetically active radiation from satellite imagery at three sites – application to the monitoring of indoor soft fruit crops in southern UK Open
This paper assesses several methods for the retrieval of Photosynthetically Active Radiation (PAR) from satellite imagery. The results of five different methods are compared to coincident in-situ measurements collected at three sites in so…
View article: Evaluating the spatial and temporal variations of the performance of CAMS Radiation Service and HelioClim-3 databases of surface irradiation in Germany
Evaluating the spatial and temporal variations of the performance of CAMS Radiation Service and HelioClim-3 databases of surface irradiation in Germany Open
Satellite-derived databases of the surface solar irradiance (SSI) have become an essential source of information for various applications in solar energy. Assessing the accuracy of these data by comparison with reference in-situ measuremen…
View article: Verifying the spatial consistency of the CAMS Radiation Service and HelioClim-3 satellite-derived databases of solar radiation using a dense network of measuring stations: the case of The Netherlands
Verifying the spatial consistency of the CAMS Radiation Service and HelioClim-3 satellite-derived databases of solar radiation using a dense network of measuring stations: the case of The Netherlands Open
The present work deals with two well-known databases of hourly mean of solar irradiance that are derived from satellite imagery: the CAMS Radiation Service version 3.2, abbreviated as CAMS-Rad and part of the Copernicus Atmosphere Monitori…
View article: A New Clear-Sky Method for Assessing Photosynthetically Active Radiation at the Surface Level
A New Clear-Sky Method for Assessing Photosynthetically Active Radiation at the Surface Level Open
A clear–sky method to estimate the photosynthetically active radiation (PAR) at the surface level in cloudless atmospheres is presented and validated. It uses a fast and accurate approximation adopted in several radiative transfer models, …
View article: Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear‑v3
Improving the McClear model estimating the downwelling solar radiation at ground level in cloud-free conditions – McClear‑v3 Open
The fast McClear clear-sky model estimates the downwelling shortwave direct and diffuse irradiances
\nreceived at ground level under cloud-free conditions. Several improvements are presented. They focus on
\nthe modeling of changes in irra…
View article: Monitoring aerosols over Europe: an assessment of the potential benefit of assimilating the VIS04 measurements from the future MTG/FCI geostationary imager
Monitoring aerosols over Europe: an assessment of the potential benefit of assimilating the VIS04 measurements from the future MTG/FCI geostationary imager Open
The study assesses the possible benefit of assimilating aerosol optical depth (AOD) from the future space-borne sensor FCI (Flexible Combined Imager) for air quality monitoring in Europe. An observing system simulation experiment (OSSE) wa…
View article: Assessment of Six Different Methods for the Estimation of Surface Ultra-Violet Fluxes at One Location in Uruguay
Assessment of Six Different Methods for the Estimation of Surface Ultra-Violet Fluxes at One Location in Uruguay Open
des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
View article: Testing several methods for the fusion of the two HelioClim-1 and-3 data sets of daily downwelling solar radiation at surface-Application to the creation of a new consistent 1985-2016 data set
Testing several methods for the fusion of the two HelioClim-1 and-3 data sets of daily downwelling solar radiation at surface-Application to the creation of a new consistent 1985-2016 data set Open
The HelioClim-1 and-3 data sets provide satellite-derived estimates of the daily downwelling solar radiation at the surface at different spatial and temporal resolutions and different periods with an overlap of 23 months in 2004-2005. Eigh…
View article: Downwelling surface solar irradiance in the tropical Atlantic Ocean: a comparison of re-analyses and satellite-derived data sets to PIRATA measurements
Downwelling surface solar irradiance in the tropical Atlantic Ocean: a comparison of re-analyses and satellite-derived data sets to PIRATA measurements Open
This paper assesses the merits and drawbacks of several data sets of solar downwelling radiation received at the horizontal surface of the tropical Atlantic Ocean where the magnitude of this radiation and its spatial and temporal variabili…
View article: Preliminary results of the new method Heliosat-5 Interim for the assessment of the solar radiation at surface from geostationary meteorological satellites
Preliminary results of the new method Heliosat-5 Interim for the assessment of the solar radiation at surface from geostationary meteorological satellites Open
The well-know and widely cited Heliosat-2 method has been successfully applied at Transvalor and MINES Paris-Tech for more than twelve years to derive solar irradiance received at ground level from satellite imagery. It has been applied on…
View article: Assessment of CAMS Radiation Service and HelioClim-3 satellite-derived databases against ground-based measurements in The Netherlands
Assessment of CAMS Radiation Service and HelioClim-3 satellite-derived databases against ground-based measurements in The Netherlands Open
Satellite-derived databases of the surface solar irradiance (SSI) are common tools in solar energy and assessing their performance by comparison with in situ measurements is a common activity. The present work focuses on two databases: the…
View article: Comparison and quality assessment of five different methods for the estimation of PAR from satellite imagery-Application to the monitoring of raspberry harvest to maximize farmers' profit in Southern UK
Comparison and quality assessment of five different methods for the estimation of PAR from satellite imagery-Application to the monitoring of raspberry harvest to maximize farmers' profit in Southern UK Open
This communication deals with the assessment of the Photosynthetically Active Radiation (PAR) from satellite images. Five different methods are applied onto Meteosat images over Europe and their results are compared to PAR measurements per…
View article: Creating a proof-of-concept climate service to assess future renewable energy mixes in Europe: An overview of the C3S ECEM project
Creating a proof-of-concept climate service to assess future renewable energy mixes in Europe: An overview of the C3S ECEM project Open
The EU Copernicus Climate Change Service (C3S) European Climatic Energy Mixes (ECEM) has produced, in close collaboration with prospective users, a proof-of-concept climate service, or Demonstrator, designed to enable the energy industry a…
View article: Monitoring aerosols over Europe: an assessment of the potential benefit of assimilating the VIS04 measurements from the future MTG/FCI geostationary imager
Monitoring aerosols over Europe: an assessment of the potential benefit of assimilating the VIS04 measurements from the future MTG/FCI geostationary imager Open
The study assesses the possible benefit of assimilating Aerosol Optical Depth (AOD) from the future spaceborne sensor FCI (Flexible Combined Imager) for air quality monitoring in Europe. An Observing System Simulation Experiment (OSSE) was…
View article: Monthly solar radiation in the tropical Atlantic Ocean: Can its spatial variations be captured by the current configuration of the PIRATA moorings?
Monthly solar radiation in the tropical Atlantic Ocean: Can its spatial variations be captured by the current configuration of the PIRATA moorings? Open
The present work aims at contributing to the proper design of networks of measuring moorings with regard to the downwelling solar irradiance at surface (DSIS). Considering the yearly profiles of the monthly DSIS, this article studies wheth…
View article: Chronotype and environmental light exposure in a student population
Chronotype and environmental light exposure in a student population Open
In humans and most other species, changes in the intensity and duration of light provide a critical set of signals for the synchronisation of the circadian system to the astronomical day. The timing of activity within the 24 h day defines …
View article: CAMS-72 Solar radiation products, D72.2.3.1 Regular Validation Report, S-O-N 2017
CAMS-72 Solar radiation products, D72.2.3.1 Regular Validation Report, S-O-N 2017 Open
D72.2.3.1 Regular Validation Report, S-O-N 2017