(SGER) BOREAS SSA Precipitation Radar

9321105 莱滕 BOREAS的目标是“提高我们对北方森林生物群落与大气之间相互作用的理解。 实验设计是基于1994年夏季的密集观测，两个研究领域的大约400-600平方公里，附近的北方森林生物群落的北方和南部的限制。 研究区域相距约600公里，靠近马尼托巴的汤普森和萨斯喀彻温省的尼帕温。该项目的目标是获得BOREAS南部研究区的雷达数据集，以确定1994年夏季以南部研究区为中心的160公里直径圆内降水的空间变化。 降水量在盛夏最大，并与对流风暴有关。 了解夏季降水的空间分布，以及土壤水分的相关动态，对BOREAS的目标至关重要。 了解土壤水分的时空分布以及在土壤限制条件下影响蒸发通量的相关径流产生机制，对于探索北方植被、痕量气体通量和北方气候中陆地-大气动力学其他方面的相互作用的研究至关重要。 利用遥感和建模技术改进详细的地方尺度能量和质量平衡以及生物物理研究是一个重要组成部分。 尺度放大是重要的，因为传输机制发生在数百公里的规模，但管理过程主要是在现场规模的措施。 PI的BOREAS研究由NASA资助，拟议的资金将全部用于定位，操作和处理从C波段降水雷达收集的数据的成本。 这笔费用将与加拿大大气环境局分摊。 该提案应被视为代表了BOREAS社区的普遍需求。 ***

9321105 Lettenmier The goal of BOREAS is "to improve our understanding of the interactions between the boreal forest biome and the atmosphere. The experimental design is based on intensive observations during summer, 1994, of two study areas of approximate size 400-600 km2, near the northern and southern limits of the boreal forest biome. The study areas, which are about 600 km apart, are near Thompson, Manitoba, and Nipawin, Saskatchewan. The objectives of this project are to acquire a radar data set for the BOREAS Southern Study Area (SSA) to define the spatial variability of precipitation in the summer of 1994 in 160 km diameter circle centered in the SSA. The precipitation is maximum in mid-summer and is associated with convective storms. Understanding the spatial distribution of summer precipitation, and the associated dynamics of soil moisture, are critical to the goal of BOREAS. Knowledge of the space-time distribution of soil moisture, and related runoff-generation mechanisms that affect evaporative fluxes under conditions of soil limitation, will be essential for studies exploring the interactions of boreal vegetation, trace gas fluxes, and other aspects of land-atmosphere dynamics in northern climates. Upscaling detailed local-scale energy and mass balances, and biophysical studies using remote sensing and modelling is an essential component. Upscaling is important because transport mechanisms occur at the scale of hundreds of km, but the governing processes are largely measure at the field scale. The PI's BOREAS research is funded by NASA and the proposed funding would, in its entirety, go toward the cost of locating, operating, and processing data collected from a C-band precipitation radar. The cost would be shared with the Canadian Atmospheric Environment Service (AES). The proposal should be considered as representative of a general need of the BOREAS community. ***