The impact of the dynamic and thermodynamic flow conditions on the spatio-temporal distribution of precipitation in southern Patagonia

南美洲最南端的大陆楔是唯一位于南纬45°和60°之间的重要大陆块。南北向的安第斯山脉为盛行的西风带提供了一个有效的屏障，并决定性地影响了半球环流和当地的天气条件。安第斯山脉作为对流层气流的障碍，形成了西湿润东干燥的气候墙。安第斯山脉西坡上空低空风的抬升常常伴随着该地区强烈的地形降水。横越山脉的气流导致了众所周知的中尺度和区域尺度大气流动现象的发展。相关的能量和质量交换有效地改变了雨雪的分布和沉降。尽管该地区水流、地形和降水之间的相互作用很强，但迄今为止对该地区的研究很少。该研究项目有助于了解巴塔哥尼亚地区降水动力过程与时空变异之间的相互作用。该项目的目的是量化相关过程，为相关机制提供新的见解。通过高分辨率数值模拟，详细研究了流体的动力和热力学特性。进一步采用简化分析模型研究了大气扰动对降水分布的敏感性。研究结果为水文、冰川学和生态学研究提供了有价值的信息。

The far south reaching continental wedge of South America is the only significant landmass between 45° and 60°S. The north-south-striking Andes present an effective barrier for the prevailing westerlies and decisively influence both, the hemispheric circulation and the local weather conditions. The Andes act as an obstacle for the tropospheric flow, forming a climatic wall with moist conditions to the west and dry conditions to the east. Uplift of low-level winds over the western slope of the Andes often go along with intensive orographic precipitation in this region. The flow across the mountain range leads to the development of well known atmospheric flow phenomena on the meso- as well as on the regional scale. The associated exchange of energy and mass effectively modifies the distribution and fallout of rain and snow. Despite the strong interaction between flow, topography and precipitation in this region only little research has been carried out so far. This research project makes a contribution to the understanding of the interaction between dynamic processes and the spatial and temporal variability of precipitation in Patagonia. The aim of the project is the quantification of relevant processes, which provide new insights on relevant mechanisms. Dynamic and thermodynamic flow properties are studied in detail by means of high-resolution numerical simulations. Simplified analytical models are further used to study the sensitivity of atmospheric perturbations on the precipitation distribution. The results obtained by this study provides valuable information for hydrological, glaciological and ecological topics.