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Biogeosciences An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/bg-2020-31
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/bg-2020-31
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 26 Mar 2020

Submitted as: research article | 26 Mar 2020

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This preprint is currently under review for the journal BG.

Bioclimatic traits in statistical properties of daily photosynthetically active radiation

Estefanía Muñoz and Andrés Ochoa Estefanía Muñoz and Andrés Ochoa
  • Universidad Nacional de Colombia, Medellín, Colombia

Abstract. In this paper, we present a methodology to analyze the stochastic component of daily solar radiation at the earth's surface in the photosynthetically active spectral band. Extraterrestrial solar spectral irradiance from the SOLID project and in situ observed PAR from the FLUXNET data set are used to calculate daily time series of the clearness and clear-sky indices for 28 FLUXNET sites around the world for 1978–2014. We found that the shape of the probability distribution functions of the clearness and clear-sky indices exhibit a spatial pattern related to the Köppen climate classification and the Holdridge life zones. According to the Köppen classification, oceanic, humid continental, and Mediterranean climates show bimodal distributions; semi-arid, temperate, subtropical, and desert climates show unimodal distributions with high dispersion; and tropical climates show unimodal distributions with low dispersion. Moreover, according to the Holdridge triangle, sites with bimodal distributions are concentrated in moist and wet forest life zones located in boreal and cool temperate regions and sub-humid and humid provinces. Unimodal distributions with high dispersion are concentrated in the moist forest life zone in subtropical and tropical regions and humid province; and unimodal distributions with low dispersion are concentrated in dry forest, very dry forest, and thorn woodland in tropical and subtropical regions between arid and subhumid humidity provinces.

Estefanía Muñoz and Andrés Ochoa

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Estefanía Muñoz and Andrés Ochoa

Estefanía Muñoz and Andrés Ochoa

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Short summary
In this paper, we present a methodology to analyze the stochastic component of daily solar radiation at the earth's surface in the photosynthetically active spectral band. We found that the shape of the probability distribution functions of the clearness and clear-sky indices exhibit a spatial pattern related to the Köppen climate classification and the Holdridge life zones.
In this paper, we present a methodology to analyze the stochastic component of daily solar...
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