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|Created:||Jan 17, 2021 at 6:19 p.m.|
|Last updated:|| Jan 21, 2021 at 5:23 p.m.
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This database comprises the information used to calculate the clear-day and clearness indices in 37 FLUXNET sites distributed across the globe and their values. Data are obtained using the FLUXNET data set (Baldocchi, 2001, Olson, 2004) and the "First European Comprehensive Solar Irradiance Data Exploitation project'' (SOLID) (Haberreiter, 2017, Scholl, 2016).
The results obtained with this database are published in Muñoz & Ochoa (2021). Climatic traits on daily clearness and cloudiness indices. This article inspects for climatic traits in the shape of the probability density function (PDF) of the clear-day (c) and the clearness (k) indices. The analysis was made for shortwave radiation (SW) at all sites and for photosynthetically active radiation (PAR) at 28 sites. We identified three types of PDF, unimodal with low dispersion (ULD), unimodal with high dispersion (UHD), and bimodal (B), with no difference in the PDF type between c and k at each site. Looking for regional patterns in the PDF type we found that latitude, global climate zone, and Köppen climate type have a weak and the Holdridge life a stronger relation with c and k PDF types.
doy: day of the year TSI: Total spectral irradiance SW: Shortwave PAR: Photosynthetically active radiation Q0: Daily radiation on a horizontal surface at TOA. Qb: Daily beam radiation on a horizontal surface for cda atmosphere. Qd: Daily diffuse radiation on a horizontal surface for cda atmosphere. Qg: Daily global radiation on a horizontal surface for cda atmosphere. SW_IN: Daily global SW radiation on a horizontal surface from FLUXNET data set. PAR_IN: Daily global PAR on a horizontal surface from FLUXNET data set. cSW: clear-day index for SW. cPAR: clear-day index for PAR. kSW: clearness index for SW. kPAR: clearness index for PAR. P: Precipitation from FLUXNET data set.
|Q0||Daily radiation on a horizontal surface at TOA.|
|Qb||Daily beam radiation on a horizontal surface for cda atmosphere.|
|Qd||Daily diffuse radiation on a horizontal surface for cda atmosphere.|
|Qg||Daily global radiation on a horizontal surface for cda atmosphere.|
|PAR||Photosynthetically active radiation|
|doy||day of the year|
|SW_IN||Daily global SW radiation on a horizontal surface from FLUXNET data set.|
|PAR_IN||Daily global PAR on a horizontal surface from FLUXNET data set.|
|This resource is referenced by||Muñoz & Ochoa. 20201. Climatic traits on daily clearness and cloudiness indices. https://doi.org/10.5194/bg-2020-31|
|This resource has been replaced by a newer version||Muñoz, E. (2021). Radiation, clearness and clear-day indices at 37 FLUXNET sites, HydroShare, http://www.hydroshare.org/resource/0ce8f488255e4858b0045781e81eeac3|
|The content of this resource is derived from||Baldocchi, Dennis, et al. "FLUXNET: A new tool to study the temporal and spatial variability of ecosystem-scale carbon dioxide, water vapor, and energy flux densities." Bulletin of the American Meteorological Society 82.11 (2001): 2415-2434.|
|The content of this resource is derived from||Olson, R. J., et al. FLUXNET. Database of fluxes, site characteristics, and flux-community information. No. ORNL/TM-2003/204. Oak Ridge National Lab.(ORNL), Oak Ridge, TN (United States), 2004.|
|The content of this resource is derived from||Haberreiter, Margit, et al. "A new observational solar irradiance composite." Journal of Geophysical Research: Space Physics 122.6 (2017): 5910-5930.|
|The content of this resource is derived from||Schöll, Micha, et al. "Making of a solar spectral irradiance dataset I: observations, uncertainties, and methods." (2016): A14.|