SNOWIE: DOW6 Doppler Spectra. Version 1.0

Doppler spectra are derived from vertical radar scans (89° elevation) by analyzing the in-phase (I) and quadrature (Q) components of the returned signal. The I/Q time-series data are divided into range gates, and a Fast Fourier Transform (FFT) is applied to convert the data from the time domain to the frequency domain. This reveals Doppler frequency shifts caused by moving scatterers, producing spectra that show the distribution of power across velocities. We corrected the data for the influence of the horizontal wind since the scans were not perfectly vertical and removed returns from ground-clutter. The frequency of data collection was based on DOW6 scanning and data are usually sampled every 4-6 minutes. The data are in netCDF format.

多普勒频谱（Doppler spectra）源自仰角89°的垂直雷达扫描，通过分析回波信号的同相（I）与正交（Q）分量得到。I/Q时间序列数据被划分为距离门（range gates），随后应用快速傅里叶变换（Fast Fourier Transform, FFT）将数据从时域转换至频域，进而揭示由运动散射体引发的多普勒频移，生成可展现功率随速度分布的频谱。由于本次扫描并非完全垂直，我们对数据进行了水平风场影响校正，并去除了地面杂波（ground-clutter）回波。数据采集频率基于DOW6扫描方案设定，通常每4至6分钟采样一次。数据集采用netCDF格式存储。

搜集汇总

背景与挑战

背景概述

SNOWIE项目的DOW6雷达多普勒频谱数据集包含垂直雷达扫描(89°仰角)处理后的多普勒频移数据，通过FFT转换和风场校正，以netCDF格式提供每4-6分钟采样的频谱分布信息。