Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador
Cloud detection in the Tropics--a suitable tool for climate-ecological studies in the high mountains of Ecuador
复制标题
热带地区的云检测——厄瓜多尔高山气候生态研究的合适工具
DOI：
10.1080/01431160410001709967
复制
发表时间：
2004
影响因子：
3.4
通讯作者：
W. E. Palacios
中科院分区：
文献类型：
--
作者：
J. Bendix;R. Rollenbeck;W. E. Palacios
云的探测和云频率的分析对于业务天气预报和气候生态研究都起着重要的作用。利用美国国家海洋和大气管理局高级甚高分辨率辐射计（NOAA-AVHRR）资料，提出了一种厄瓜多尔热带山区云检测的阈值技术。云分类进行白天和夜间立交桥通过应用几个阈值测试，其中还包括辅助地形信息。从一组155张图像中，计算出厄瓜多尔及其邻近地区以及厄瓜多尔南部（洛哈）生态项目中心研究区的相对云频率图。结果表明，由于阻塞和背风效应，地形，主气流和云量之间存在着明显的关系。事实证明，厄瓜多尔帕拉莫等高山生态系统的空间延伸受到云频率空间格局的显着影响。
The detection of clouds and the analysis of cloud frequency play an important role for operational weather prediction as well as for climate-ecological studies. A threshold technique for cloud detection in the tropical mountainous area of Ecuador is presented which is based on National Oceanic and Atmospheric Administration Advanced Very High Resolution Radiometer (NOAA-AVHRR) data. Cloud classification is performed for both day and night overpasses by applying several threshold tests which also include ancillary terrain information. From a set of 155 images, maps of relative cloud frequency are calculated for Ecuador and adjacent areas as well as the central study area of an ecological project in southern Ecuador (Loja). Results show a clear relation between topography, main airflow and cloudiness due to barrage and lee-effects. The spatial extension of high mountain ecosystems such as the Ecuadorian Páramo has been proven to be significantly influenced by the spatial pattern of cloud frequency.