Detections and simulations of tropospheric water vapor fluctuations due to trapped lee waves by ALOS-2/PALSAR-2 ScanSAR interferometry

摘要: Detailed wave-like spatial patterns of atmospheric propagation delay signals associated with mountain lee waves were detected in Hokkaido and Tohoku by synthetic aperture radar (SAR) interferometry (InSAR) the ScanSAR mode observation data a Phased Array-type L-band Synthetic Aperture Radar 2 on board Advanced Land Observing Satellite 2. Both cases occurred under stable atmosphere conditions. The InSAR-observed peak-to-trough line sight changes wave was 4 5 cm horizontal wavelengths 9 15 km Tohoku, respectively. Locations positive phase maxima coincides locations cloud streets observed visible satellite imagery, indicating that crests contain relatively much water vapor compared troughs. Numerical weather simulations grid spacing 1 km performed to reproduce InSAR variations, as result those could reasonably amplitudes both cases. On other hand, numerical tended overestimate attenuation rates: simulated decreased propagated faster than signals. Because rate is sensitive physics planetary boundary layer (PBL), we investigated reproducibility five PBL schemes implemented WRF model. As result, all showed little except for Yonsei University scheme (YSU), while wavelength YSU most close observation. Our study demonstrated uniqueness usefulness meteorological application ability map detailed distribution regardless cover. In addition, reasonable signal due model encourages researchers who tackle correction tropospheric delay, increasing accuracy detecting surface deformations.