Climatic snow line

Japanese: 気候的雪線 - きこうてきせっせん

… The position of a glacier's equilibrium line varies greatly depending on the topography around the glacier and the distribution of the glacier, so the snow line determined based on each glacier's equilibrium line is called the orographic snowline. In contrast, the average snow line of a glacier in an entire region is called the regional snowline or climatic snowline, and several approximation methods have been devised. For example, one method is to use the midpoint between the elevation of the mountains with glaciers and the elevation of the mountains without glaciers as the representative value (the mountain-top method). …

From "Eternal Snow"

…the lower limit of perennial snow, that is, the line connecting the points where the annual amount of accumulated snow is equal to the amount of snow lost due to melting, etc., is called the snow line. Its height is controlled by climatic factors such as snowfall and temperature, so it is also called the climatic snow line, and generally the higher the latitude, the lower the snow line height. On the other hand, snowfields formed by remaining avalanche debris and drifted snow are also called perennial snow, and its lower limit is controlled by topography, so it is called the topographical snow line. …

*Some of the terminology that refers to the "climatic snow line" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…　氷河の均衡線の位置は，氷河のまわりの地形や氷河の分布形状によって大きく変わるので，それぞれの氷河の均衡線にもとづいて決められた雪線は地形的雪線orographic snowlineとよばれる。これに対して，ある地域全体の氷河の平均的な雪線の代表値は広域的雪線regional snowlineまたは気候的雪線climatic snowlineとよばれ，いくつかの近似法が考案されている。たとえば，ある地域で氷河をもつ山の高度と，氷河をもたない山の高度との中間高度を代表値とする方法(山頂法)はその一つである。…

【万年雪】より

…万年雪の下限，すなわち年間の雪の堆積量と融解などによる消耗量とが等しい点を連ねた線を雪線snow lineという。その高度は降雪量，気温などの気候因子に支配されるので気候的雪線とも呼ばれ，一般に高緯度地方ほど雪線高度は低くなる。一方，なだれのデブリや吹き溜った雪が残ってできる雪渓も万年雪と呼ばれ，その下限は地形に支配されるので地形的雪線と呼ばれる。…

※「気候的雪線」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典第２版について | 情報

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