Glacioclimatological Study of Perennial Ice in the Fuji Ice Cave, Japan. Part 1. Seasonal Variation and Mechanism of Maintenanceстатья из журнала
Аннотация: Perennial cave ice in a cave located at Mt. Fuji in central Japan was studied to investigate the basic characteristics and the cause for existence of such ice under warm ground-level climate (annual mean air temperature: 8.40C) considering the ice cave as a thermal and hydrological system. Fuji Ice cave is a lava tube cave 150 m in length with a collapsed part at the entrance. Measurements from 1984 to 1986 showed that the surface-level change of floor ice occurred due to freezing and melting at the surface and that melting at the bottom of the ice was negligible. The freezing occurred from December to July, with an areal mean value of 45 kg m-2, and melting occurred from August to November with a value of 7 kg mn-2. The annual amplitude of change in surface level was larger near the entrance. Meteorological data showed that the cold air inflow to the cave was strong in winter, but in summer the cave was maintained near 00C with only weak inflow of warm air. The predominant wind system was from the entrance to the interior in both winter and summer, but the spatial scale of the wind system was different. Cold dry air directly came from the surface ground level in winter, but it came from the upper cave connected via the collapsed part of the lava tube in summer. Heat budget consideration of the cave showed that the largest component was the strong inflow of subzero dry air mass in winter. The heat used for freezing and melting of ice was small in comparison. Cooling in winter was compensated for by summer inflow of warm air, heat transport from the surrounding ground layer, and loss of sensible heat due to cooling of the cave for the observed year. Strong inflow of cold air and weak inflow of warm air, which is extremely low compared to the ground level air, seemed to be the most important condition. Thus the thermal condition of the cave is quasi-balanced at the present condition below OoC with ice. It can be said that the interrelated result of the climatological and special structural conditions makes this cave very cold, and allows perennial ice to exist in the cave. Other climatological factors such as precipitation seem to be
Год издания: 1994
Авторы: Tetsuo Ohata, Teruo Furukawa, Keiji Higuchi
Издательство: Taylor & Francis
Источник: Arctic and Alpine Research
Ключевые слова: Karst Systems and Hydrogeology, Subterranean biodiversity and taxonomy, Cryospheric studies and observations
Открытый доступ: closed
Том: 26
Выпуск: 3
Страницы: 227–227