Radiation, clearness and clear-day indices at 37 FLUXNET sites


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Created: Jan 17, 2021 at 6:19 p.m.
Last updated: Jan 21, 2021 at 5:23 p.m.
DOI: 10.4211/hs.808cf3c2f01e427e84435af0c60c5974
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Abstract

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.

Subject Keywords

Content

readme.txt

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.

Additional Metadata

Name Value
P Precipitation
c clear-day index
k clearness index
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 Shortwave
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.

References

Sources

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.
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.
Derived From: Haberreiter, Margit, et al. "A new observational solar irradiance composite." Journal of Geophysical Research: Space Physics 122.6 (2017): 5910-5930.
Derived From: Schöll, Micha, et al. "Making of a solar spectral irradiance dataset I: observations, uncertainties, and methods." (2016): A14.

Related Resources

The content of this resource serves as the data for: 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 newer version: http://www.hydroshare.org/resource/7962c298ce544953be8d1dd6dab63bb0
This resource has been replaced by newer version: http://www.hydroshare.org/resource/0ce8f488255e4858b0045781e81eeac3

How to Cite

Muñoz, E. (2021). Radiation, clearness and clear-day indices at 37 FLUXNET sites, HydroShare, https://doi.org/10.4211/hs.808cf3c2f01e427e84435af0c60c5974

This resource is shared under the Creative Commons Attribution CC BY.

 http://creativecommons.org/licenses/by/4.0/
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