Cloud occurrence and cloud properties in Ecuador
Cloud occurrence and cloud properties in Ecuador
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DOI：
10.3354/cr030133
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发表时间：
2006-02-23
期刊：
影响因子：
1.1
通讯作者：
Cermak, J
中科院分区：
文献类型：
--
作者：
Bendix, J;Rollenbeck, R;Cermak, J
我们使用了3年的数据集NOAA-AVHRR（高级甚高分辨率辐射计）图像调查云频率，云顶高度和云液态水路径的厄瓜多尔地区，特别是在厄瓜多尔南部的安第斯山脉的特定区域。在一般情况下，云量的季节性循环显着相关的雨季的空间发生，但是，我们发现，复杂的地形的安第斯山脉与动态影响，在迎风面和背风面，以及热微风系统，造成云的频率和云的特性的特定的空间结构。例如，安第斯山脉东部的斜坡主要受到东风的强烈动态阻挡效应的影响，在安第斯山脉发生系统（AOS）雨带的地区出现了一条高云频率的线。平均云顶高度揭示了西部科迪勒拉山脉以西的太平洋地区与该国东部地区之间的明显划分，前者的特点是较低和更多的层状云，而后者的平均云顶高度向亚马逊河方向增加表明对流云形成过程加剧。这与亚马逊河上空云液路径的量较高相对应，这表明与厄瓜多尔沿海平原相比，云水循环更为密集。
We used a 3 yr data set of NOAA-AVHRR (Advanced Very High Resolution Radiometer) imagery to investigate cloud frequency, cloud-top height and cloud liquid water path for the Ecuadorean area, with special reference to a specific region in the Andes of southern Ecuador. In general, the seasonal cycle of cloudiness is significantly correlated to the spatial occurrence of the rainy seasons, However, we found that the complex topography of the Andes with dynamic effects at the windward and lee sides, as well as thermal breeze-systems, cause a specific spatial structure of cloud frequency and cloud properties. For instance, the eastern Andean slopes are mainly affected by a strong dynamic barrage effect of the easterlies, where a line of high cloud frequency occurs in the area of the Andes-occurring system (AOS) rain band. Average cloud-top height reveals a clear division between the Pacific area west of the western Cordillera chain, characterised by lower and more stratiform clouds, and the eastern parts of the country where an increase in average cloud-top height towards the Amazon indicates an intensification of convective cloud formation processes. This corresponds with the higher amounts of cloud liquid path over the Amazon, which illustrates that the cloud water cycle is more intensive in comparison to the Ecuadorian coastal plains.