10:45 AM - 12:15 PM
[AAS03-P01] Variations of precipitable water vapor from FORMOSAT-7/COSMIC-2 and GPS/GNSS - preliminary study during the Mei-yu season in Taiwan
Keywords:FORMOSAT-7/COSMIC-2, GNSS, GPS meteorology, precipitable water vapor, Mei-yu season, rainfall
The Mei-yu season contributes 26.3% of the annual precipitation and provides important water resources to Taiwan. GPS meteorology derives continuous, real-time and high spatial coverage of perceptible water vapor (PWV), which supports weather forecasting for rainfall indicators. FORMOSAT-7/COSMIC-2 have launched on June 2019 and provided high space resolution RO profile data. The data can be benefit for weather and climate studies, as well as increasing the accuracy of weather forecast.
This study analyzes the long-term spatial-temporal changes in GPS PWV and rainfall data during the Mei-yu season from 2006 to 2019. The daily average data show that the Mei-yu season extended in recent years. The yearly results show that the trend of the accumulated rainfall in the Mei-yu season is flat, and that PWV increases by 13% over 14 years, which may be due to global warming as the trend of temperature increases by 8%. Spatially, PWV is significantly higher in southern Taiwan during the Mei-yu season, and rainfall increased the most in both the central and southern mountain regions.
Two years (2020-2021) FORMOSAT-7 RO-PWV error is 12.5 mm based on GNSS-PWV as reference value. Next, we will discuss space and time variations of the RO-PWV and GNSS-PWV during the Mei-yu season.
This study analyzes the long-term spatial-temporal changes in GPS PWV and rainfall data during the Mei-yu season from 2006 to 2019. The daily average data show that the Mei-yu season extended in recent years. The yearly results show that the trend of the accumulated rainfall in the Mei-yu season is flat, and that PWV increases by 13% over 14 years, which may be due to global warming as the trend of temperature increases by 8%. Spatially, PWV is significantly higher in southern Taiwan during the Mei-yu season, and rainfall increased the most in both the central and southern mountain regions.
Two years (2020-2021) FORMOSAT-7 RO-PWV error is 12.5 mm based on GNSS-PWV as reference value. Next, we will discuss space and time variations of the RO-PWV and GNSS-PWV during the Mei-yu season.