Aonuma

...There are also lakes where the water temperature is highest just below the surface, and there are lakes such as Lake Vanda in Antarctica where the bottom water temperature is 25°C even when the surface is frozen. In Japan, precipitation exceeds evaporation throughout the year, so there are no salt lakes due to evaporation, but there are a few salt lakes due to high salinity water flowing in from volcanic areas, such as Aonuma in Urabandai (1.491g/l). [Kiyoji Horiuchi]...

*Some of the terminology that refers to "Aonuma" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また湖水の表面下で最高水温を示す湖もあり，南極のバンダ湖のように表面が結氷していても底層水温が25℃もある湖もある。日本では降水量が年中蒸発量を上回るため，蒸発濃縮による塩湖はなく，裏磐梯の青沼(1.491g/l)などのように火山地域の高塩分の流入水による塩湖が若干みられる。【堀内 清司】。…

※「青沼」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