Photosynthetically available radiation at high latitudes
Photosynthetically available radiation at high latitudes
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高纬度地区的光合有效辐射
DOI：
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发表时间：
1989
期刊：
影响因子：
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通讯作者：
T. Aarup
中科院分区：
文献类型：
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作者：
Janet W. Campbell;T. Aarup
在高纬度地区，太阳高度较低，导致两种现象，影响进入海洋的光的数量和质量。高表面反射率显著降低直接太阳辐照度，并在较小程度上降低全球辐照度。此外，存在明显的光谱偏移，使得成比例地更多的蓝色（漫射）光被透射并且更多的红色（直射）光被海面反射。光合有效辐射（PAR）的模型已被用来量化这些影响。该模型用于预测每日宽带（400-700 nm）光子通量作为纬度和一年中不同无云大气条件下时间的函数。在40°和70°N之间的纬度上，描述了地面反射波的季节和光谱变化。建立了表面波浪的范围，其中包括由于大气浑浊度和风引起的表面波引起的变化。
Low solar elevations at high latitudes result in two phenomena that affect the quantity and quality of light entering the sea. High surface reflectances significantly reduce the direct solar irradiance and, to a lesser extent, the global irradiance. Furthermore, there is an apparent spectral shift such that proportionately more blue (diffuse) light is transmitted and more red (direct) light is reflected by the sea surface. A model of photosynthetically available radiation (PAR) has been used to quantify these effects. The model was developed to predict daily broadband (400–700 nm) photon flux as a function of latitude and time of year for varying cloud‐free atmospheric conditions. Seasonal and spectral variability of the surface albedo is described at latitudes between 40° and 70°N. Ranges are established for surface albedo which encompass variability due to atmospheric turbidity and wind‐induced surface waves.