Three-dimensional structure of climate in Yakushima Island

本研究的目的是在观测资料的基础上阐明屋久岛气候的海拔变化。重点分析了鹿儿岛自由大气垂直结构与屋久岛温度和相对湿度垂直变化的关系。在天气条件下，代道沟（1360m）与黑龙山（1800m）之间的温度逆温和代道沟至黑龙山的相对湿度大幅度下降往往发生在行进反气旋的控制下。在这种情况下，逆温层倾向于在鹿儿岛自由大气的1000 ~ 1500m之间发展。山顶周围的温度和相对湿度变化与自由大气相似。相反，尤道狗的温度和相对湿度的变化与自由大气的变化不一致。这种山坡与自由大气气候关系的高度差异取决于植被的差异。综上所述，屋久岛气候的高度差异可能是自由空气的垂直结构与植被的高度差异相互作用的结果。

The purpose of this study is to clarify the altitudinal change in climate of Yakushima Island based on the observed data. The relationship between the vertical structure of free atmosphere at Kagoshima and the altitudinal change in temperature and relative humidity at Yakushima Island are mainly analyzed.The inversion of temperature between Yodogou (1360m) and Kuromi-dake mountain (1800m) and the large decrease of relative humidity from Yodogou to Kuromi-dake mountain often occur under the control of traveling anticyclone on a synoptic condition. In this case, the inversion layer tends to develop between 1000m and 1500m in the free atmosphere of Kagoshima. The changes of temperature and relative humidity around the top of mountain are similar to those of the free atmosphere. On the contrary, the changes of temperature and relative humidity at Yodogou do not correspond to those of the free atmosphere. This altitudinal difference of climatic relationship between mountain slope and free atmosphere depend on the difference of vegetation.Considering these results, the altitudinal difference of climate in Yakushima Island is thought to be caused by the interaction between the vertical structure of free air and the altitudinal difference of vegetation.