A Relationship between Reflectivity and Snow Rate for a High-Altitude S-Band Radar
A Relationship between Reflectivity and Snow Rate for a High-Altitude S-Band Radar
复制标题
高空S波段雷达反射率与雪率的关系
DOI：
10.1175/jamc-d-11-0112.1
复制
发表时间：
2012
影响因子：
3
通讯作者：
J. Snider
中科院分区：
文献类型：
--
作者：
Jonathan P. Wolfe;J. Snider
摘要
雷达反射率测量的一个重要应用是将其解释为降水强度。存在一些经验关系，用于将从降水粒子反演得到的微波后向散射（由等效反射率因子\(Z_e\)表示）转换为降水强度。反射率 - 降雪率关系的形式为\(Z_e = \alpha S^{\beta}\)，其中\(S\)是液态等效降雪率，\(\alpha\)和\(\beta\)是拟合系数。由于与雪相关的反射率和强度往往比雨的要小，以及由于雷达和地面探测之间雪粒子的漂移，雷达得出的降雪率值存在很大的不确定性。在少数几个已建立反射率和降雪率关系的高海拔站点，雷达得出的降雪率的不确定性尤其明显。利用一种新型降水传感器和美国国家气象局的雷达，这项工作研究了一个高海拔站点（C...）的\(Z_e - S\)关系
AbstractAn important application of radar reflectivity measurements is their interpretation as precipitation intensity. Empirical relationships exist for converting microwave backscatter retrieved from precipitation particles (represented by an equivalent reflectivity factor Ze) to precipitation intensity. The reflectivity–snow-rate relationship has the form Ze = αSβ, where S is a liquid-equivalent snow rate and α and β are fitted coefficients. Substantial uncertainty exists in radar-derived values of snow rate because the reflectivity and intensity associated with snow tend to be smaller than those for rain and because of snow-particle drift between radar and surface detection. Uncertainty in radar-derived snow rate is especially evident at the few available high-altitude sites for which a relationship between reflectivity and snow rate has been developed. Using a new type of precipitation sensor and a National Weather Service radar, this work investigates the Ze–S relationship at a high-altitude site (C...