The Conservative Ratio of Photosynthetically Active to Total Radiation in the Tropics
- 30 November 1982
- journal article
- research article
- Published by JSTOR in Journal of Applied Ecology
- Vol. 19 (3), 853-858
- https://doi.org/10.2307/2403287
Abstract
Long-term observations of n, the ratio of PAR [photosynthetically active radiation] to total solar radiation are reported for Dar es Salaam [Tarzania] (7.degree. S). The records for very clear periods confirm a previously published value for a clear tropical day, .hivin..eta. = 0.51 .+-. 0.01. For very cloudy skies, .hivin..eta. was 0.63 .+-. 0.02 in accord with the highest ratios reported outside the tropics. .eta. should be regarded as conservative rather than constant, in the tropics as in higher latitudes.This publication has 3 references indexed in Scilit:
- The Relative Flux Density of Photosynthetically Active RadiationJournal of Applied Ecology, 1977
- Small variation in the photosynthetically active fraction of solar radiation on clear daysArchives for Meteorology, Geophysics, and Bioclimatology Series B, 1976
- Relationships of photosynthetically active radiation and shortwave irradianceAgricultural Meteorology, 1976