U.S.-France Cooperative Science Program: Simulation of Airflow over Complex Terrain Using PYREX Data

这个为期三年的奖项支持美国-法国合作研究 中尺度气象学， 华盛顿和伊芙琳·理查德和菲利普·布若 法国图卢兹的保罗·萨巴蒂尔大学。 美国和 法国研究人员已经开发出空气流动的预测模型， 越过山脉 尽管人们已经认识到， 对大气环流产生重大影响， 预测模型和全球气候模型都存在缺陷， 代表了山区地理对空气循环的影响。 他们合作的具体目标是增加 了解山脉和天气之间的相互作用， 尺度空气循环，特别强调重力波 阻力 为了实现这一目标，研究人员需要更好地 了解当前模型的局限性，并改进其 灵活性. 杜兰博士的非流体静力学模型成功地模拟了 波在各种区域环境，但尚未使用 来模拟重力波和更大尺度的 气流 法国调查人员为这次合作带来了 更大规模的空气流动的流体静力学模型。 两款车型都将 以模拟真实的和理想化的越山流。 他们的 调查将有助于独特的观测数据最近 在比利牛斯山脉地区采集的。 这些补充努力将 导致模型能够更好地预测 重力波拖曳，反过来，山区天气预报 地区

This three-year award supports U.S.-France cooperative research in mesoscale meteorology between Dale Durran of the University of Washington and Evelyne Richard and Phillipe Bougeault of the University Paul Sabatier in Toulouse, France. The U.S. and French investigators have developed predictive models for air-flow over mountains. Although it has been recognized that mountains exert a significant influence on atmospheric circulations, existing forecast models and global climate models contain deficiencies in representing the effects of mountain geography on air circulation. The specific objective of their cooperation is to increase understanding of the interaction between mountains and synoptic- scale air circulation, with particular emphasis on gravity-wave drag. In order to achieve this goal, the investigators need to better understand the limitations of the current models and improve their flexibility. Dr. Durran's nonhydrostatic model successfully simulates mountain waves in a variety of regional environments, but has not been used to simulate the interaction between gravity waves and larger scale air flow. The French investigators bring to this collaboration their hydrostatic models for larger scale air flow. Both models will be to simulate real and idealized cross mountain flows. Their investigations will be aided by unique observational data recently collected in the Pyrenees region. These complementary efforts will result in models which are better able to predict the effect of gravity-wave drag and in turn, weather forecasting in mountainous regions.