黄山、天目山第四纪冰期气候

ANALYSIS OF CLIMATE IN THE HUANGSHAN AND TIANMUSHAN MOUNTAINS DURING THE QUATERNARY ICE AGE

摘要:

本文计算了黄道倾斜的温度灵敏度参数,其中考虑了天顶角反馈、生物反射率反馈和潜热反馈。经过计算表明,在有冰雪反射率的情况下,天顶角反馈的重要性,以及反馈机制在米兰柯维奇冰期理论中的重要作用。这种全球性的冰期气候背景对中国东部气候的影响是十分重要的。本文还以第四纪冰期庐山气候的研究为基础,进一步计算了冰期黄山、天目山的温度与冰雪质量平衡,指出冰期低温的春秋季十分有利于降雪和冰雪积累的。文中经过理论推算得出第四纪中国东部山地的雪线高度;它与地理地质学的考察结果很相近。最后计算得出,在有利地形条件下,黄山500年的冰雪净积累厚度可达200米以上,天目山也接近于100米左右。

Abstract:

Parameters of temperature sensivity to the ecliptic inclination are computed, with feedbacks of various zenith angles. of vegetation albedo and of latent heat being considered. Computation reveals the significance of feedback due to zenith angle in the Presence of ice or snow cover and the important role played by the feedback mechanism in the Milankovitch ice-age theory. The background global macroclimate in the ice age yields immense influence on the climate of East China. On the basis of the investigation of the Quaternary Period climate accomplished for the Lu shan Mountain, similar computations are performed on temperature and balance of mass of snow and ice for the Huangshan and Tianmushan, indicating that the low temperatures during spring and autumn are favorable for snowfall and ice accumulation.Altitude of the snow line over East China during the Quaternary Period is theoretically inferred and found to be consistent with that determined by geological study. It is further found that, with their advantageous topography. net accumulation of more than 200 meters of snow or ice may be attained over the Huangshan in 500 years, and about 100 meters for the Tianmushan.