Journal: Engineering and Management Science DOI: 10.32629/ems.v8i9.22163
Abstract
低空风切变具有尺度小、演变快和局地性强等特点，单一观测设备难以兼顾大范围覆盖、近地层精细探测和快速更新。针对天气雷达、激光测风雷达、风廓线雷达、自动气象站及机载观测等多源资料在时空分辨率、坐标体系和观测误差方面存在的差异，本文构建了一套基于WRF-4DVar的多源观测融合与三维风场重构方法。首先对异构资料进行坐标统一、时间匹配、空间网格化和质量控制；随后以WRF模式为动力约束，通过观测算子将不同类型观测映射至模式空间，在连续同化时间窗内最小化背景场与多时次观测之间的差异，获得最优三维分析风场；最后基于融合结果计算低空风切变诊断量。该方法能够在统一动力框架下综合利用多源异构观测，为机场低空风切变精细监测提供连续三维风场基础。
Keywords
低空风切变；多源观测；四维变分同化；WRF；三维风场
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