Abstract: As a significant parameter in atmospheric environmental studies, atmospheric boundary layer height (ABLH) is of great importance in research about pollutants transportation and diffusion, cloud microphysical process, model parameterization and so forth. Based on the WRF modeling in Hainan Island, the temporal and spatial variation of ABLH is analyzed. The results show that, the mean ABLH in the northern part is relatively bigger in spring and summer, about 500?600 m; while in the circular coasts from northwest to east, southeast that is bigger in autumn and winter, about 500?700 m. However, in south central coteaux the mean ABLH keeps a low value of about 200?500 m and variations of differ seasons are very little. There is a good correspondence between prevailing background wind and factors that benefit the sea breeze developing. Mean ABLH in surrounding sea appears such seasonal characteristics low in autumn and winter with a value of 500?800 m but high in spring and summer with that of 100?500 m. The ABLH inland comes to its maximum of above 1800 m in spring and summer but that offshore 1300?1500 m in autumn and winter. The diurnal characteristics inland appears very much like that in typical land surface, while in coastal zone deeply influenced by prevailing wind, the daily variation of atmospheric boundary layer presents maritime characteristics under the circumstances of onshore background wind but terrestrial on occasion of offshore wind.

Key words: Hainan Island, atmospheric boundary layer height, temporal and spatial variation, WRF model

摘要： 利用WRF模式模拟分析海南岛及其邻近海区的大气边界层高度时空变化特征。结果表明, 海南岛春夏季北部开阔地区平均边界层较高, 约500~600 m; 秋冬季海岛的西北?东?东南沿岸的半环绕地带平均边界层较高, 约500~700 m; 岛内中南部山区平均边界层高度较低且季节变化不大, 数值约200~500 m。各季盛行风向及海风发展因素与平均边界层的空间分布之间有良好的对应关系。海岛周边海区秋冬季平均边界层高度约500~800 m, 春夏季约100~500 m, 呈秋冬季高、春夏季低的季节变化特征。岛内边界层高度最大值出现在春夏季, 可达1800 m以上; 沿岸地区边界层高度最大值出现在秋冬季, 约1300~1500 m。海南岛岛内区域具有典型的陆面大气边界层日变化规律; 沿海地带受盛行风向的影响, 向岸流和离岸流时边界层日变化分别表现为海洋性和陆地性的特点。

关键词: 海南岛, 边界层高度, 时空变化, WRF模式