Lake-Induced Mesoscale Disturbances

“湖效应风暴”是众所周知的天气 预报员 在秋末冬初，冷空气 从加拿大流出的河水流经五大湖， 相对温暖，广泛的云量，有时有阵雪 发生在湖泊的背风面。以前的工作表明， 这些风暴通常具有浅的垂直结构， 经常在没有任何高层动力强迫的情况下发展。 湖泊感热通量与地表摩擦 集体地，这样认为，发挥作用。 然而，这些风暴 强迫现象？是否有不稳定机制在起作用？ 使用复杂的原始方程模型进行数值模拟， 模拟和非线性光谱模型，用于检查 物理选择，教授希勒和弗里奇将解决 这些问题。

"Lake.effect storms" are well known among weather forecasters. During late autumn and early winter when cold air from Canada flows over the Great Lakes, which are still relatively warm, extensive cloudiness and snow showers sometimes occur on the lee side of the lakes. Previous work has shown that these storms generally have a shallow vertical structure and frequently develop without any upper.level dynamical forcing. The sensible heat flux from the lakes and the surface friction collectively, so thought, play a role. However, are these storms a forced phenomenon? Is there any instability mechanism at work? Using a sophisticated primitive equation model for numerical simulations and a nonlinear spectral model for examining the physics selectively, Professors Shirer and Fritsch will address these questions.