The Influence of Forests on Atmospheric Heating during the Snowmelt Season
The Influence of Forests on Atmospheric Heating during the Snowmelt Season
复制标题
融雪季节森林对大气加热的影响
DOI：
10.1175/1520-0450-34.2.511
复制
发表时间：
1995
期刊：
影响因子：
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通讯作者：
T. Yamazaki
中科院分区：
文献类型：
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作者：
T. Yamazaki
本文通过资料分析和数值模式试验，研究了融雪期大气加热问题。数据分析的结果表明，在某些例子中，即使地面被雪覆盖，白天的气温也上升到0°C以上。此外，还发现日照时数增加时，白天气温上升到0 ℃以上的天数较多。然而，这种增加与风速无关。因此，即使在平静的条件下（弱平流），如果阳光很强，白天积雪上的空气温度也会升高。另一方面，利用局地环流模式结合冠层热平衡模式得到了以下结果。如果平原周围有森林，即使平原表面被雪覆盖而没有森林，大气也会被加热。森林冠层提供了向上的感热通量，导致大气中的热通量增加。
Abstract Atmospheric heating during the snowmelt season has been studied by means of data analysis and numerical model experiments. As a result of the data analysis, it was shown that in some examples the daytime air temperature rose above 0°C, even if the ground surface was covered by snow. Moreover, it was found that the number of days when the daytime air temperature rose above 0°C was large when the duration of sunshine increased. However, the increase was not related to the wind speed. Therefore, the air temperature over snow cover increases during the daytime if the sunshine is strong even under calm conditions (weak advection). On the other hand, the following result was obtained with the use of a local circulation model combined with a canopy heat balance model. The atmosphere was heated over the plains if forested areas existed around the plains, even if the plains surfaces were covered by snow without forests. An upward sensible heat flux was supplied from the forest canopy, resulting in atmosph...