RELATIONSHIPS OF PHOTOSYNTHETICALLY ACTIVE RADIATION AND SHORTWAVE IRRADIANCE

被引:97
|
作者
PAPAIOANNOU, G [1 ]
PAPANIKOLAOU, N [1 ]
RETALIS, D [1 ]
机构
[1] NATL OBSERV ATHENS,INST METEOROL & PHYS ATMOSPHER ENVIRONM,ATHENS,GREECE
关键词
D O I
10.1007/BF00864910
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
Hourly measurements of solar irradiance in the wave band excluding photosynthetically active radiation (PAR) and solar irradiance (SI) were made over a 12-month period at the National Observatory of Athens. for obtaining the ratios of PAR to SI. These irradiance ratios exhibit dependence on sky conditions, with slightly larger values being observed under ''cloudy'' skies and seasonal variations, attributable to changes in local air mass climatology. The highest values have been obtained during the growing season (April - September). The mean annual value of 0.473 observed for the irradiance ratio in the PAR band compares favorably with values reported in the literature for different locations over a wide geographical area.
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收藏
页码:23 / 27
页数:5
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