Hydrologic evaluation of Multisatellite Precipitation Analysis standard precipitation products in basins beyond its inclined latitude band: A case study in Laohahe basin, China

摘要: [1] Two standard Tropical Rainfall Measuring Mission (TRMM) Multisatellite Precipitation Analysis (TMPA) products, 3B42RT and 3B42V6, were quantitatively evaluated in the Laohahe basin, China, located within TMPA product latitude band (50°NS) but beyond inclined TRMM satellite (36°NS). In general, direct comparison of rainfall estimates to collocated rain gauges from 2000 2005 show that spatial temporal characteristics over region are well captured by 3B42V6 estimates. Except for a few months with underestimation, unrealistic overestimation nearly year round, which needs be resolved future upgrades real-time estimation algorithm. Both model-parameter error analysis hydrologic application suggest three-layer Variable Infiltration Capacity (VIC-3L) model cannot tolerate nonphysical behavior through integration processes, as such data have almost no utility, even at monthly scale. contrast, can produce much better predictions reduced propagation input streamflow both daily scales. This study also found structures RT V6 significant geo-topography-dependent distribution pattern, closely associated elevation bands, suggesting current limitations TRMM-era algorithms high latitudes elevations general. Looking into Global Measurement (GPM) era, Geostationary Infrared (GEO-IR) still long-term role filling inevitable gaps microwave coverage, enabling sub-hourly typical 4-km grid Thus, this affirms call systematic bias removal IR-based algorithm using simple scaling factor. correction is based on MW-based climatologies applied combined satellite-gauge research products.