Comparisons of precipitable water vapor and zenith total delay derived from GNSS measurements, radiosondes, and ERA5 reanalysis data in the contiguous United States

Key Points

• Precipitable water vapor measurements show significant variation across different data sources.
• Zenith total delay averaged 20 millimeters across analyzed regions, indicating regional differences.
• Assessment using GNSS measurements, radiosondes, and ERA5 reanalysis data provides a comprehensive evaluation.
• Findings suggest that integrating multiple data sources may enhance weather modeling accuracy.