Spatial Variability of Shortwave Irradiance for Snowmelt in Forests
Spatial Variability of Shortwave Irradiance for Snowmelt in Forests
复制标题
森林融雪短波辐照度的空间变化
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
J. Sicart
中科院分区：
文献类型：
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作者：
J. Pomeroy;Chad Ellis;A. P. Rowlands;R. Essery;J. Hardy;Timothy E. Link;Danny Marks;J. Sicart
摘要融化能量的空间变化可以影响积雪损耗率，反过来又受到短波辐照度的空间变异性的影响。短波辐照度的空间变异性在融化均匀和不连续的万年青冠层在美国落基山脉网站进行了测量，分析，然后比较从加拿大的山地和北方森林的观测。所有的观测都使用了在不同结构和纬度的万年青树冠下随机分布的日射强度计阵列。随着采样平均间隔从几分钟增加到1天，阴天和晴天的辐照度空间变异性急剧下降。在每日平均的时间间隔，有云量的影响不大，而不是冠下辐照度的变化，它是占主导地位的林分结构。不连续冠层的日间隔辐照度的空间变异性较高，但它不可靠的尺度与冠层天空视图。那个...
Abstract The spatial variation of melt energy can influence snow cover depletion rates and in turn be influenced by the spatial variability of shortwave irradiance to snow. The spatial variability of shortwave irradiance during melt under uniform and discontinuous evergreen canopies at a U.S. Rocky Mountains site was measured, analyzed, and then compared to observations from mountain and boreal forests in Canada. All observations used arrays of pyranometers randomly spaced under evergreen canopies of varying structure and latitude. The spatial variability of irradiance for both overcast and clear conditions declined dramatically, as the sample averaging interval increased from minutes to 1 day. At daily averaging intervals, there was little influence of cloudiness on the variability of subcanopy irradiance; instead, it was dominated by stand structure. The spatial variability of irradiance on daily intervals was higher for the discontinuous canopies, but it did not scale reliably with canopy sky view. The...