1. Hydrologic Evaluation of the Global Precipitation Measurement Mission over the U.S.: Error Budget Analysis.
- Author
-
Woods, Devon, Kirstetter, Pierre-Emmanuel, Vergara, Humberto, Duarte, Jorge A., and Basara, Jeffrey
- Subjects
- *
PRECIPITATION gauges , *BUDGET , *STREAM measurements , *HYDROLOGIC cycle , *HYDROLOGIC models , *ERROR rates - Abstract
• IMERG satellite and MRMS radar precipitation applied for integrated hydrologic validation. • Discrete flood characteristics assessed with respect to USGS stream gauges. • Hydrologic model impacts on flood discharge, duration, and timing are investigated. • IMERG-E discharge errors are higher than MRMS, but IMERG-E duration errors are lower. • Flood timings are better simulated at smaller basin sizes with low systematic error. This study investigates the hydrologic utility of satellite precipitation estimates from the Global Precipitation Measurement mission by comparing flood signals produced across the Continental United States by a ten-year span of in-situ, ground-based radar and satellite-based precipitation data. The flood characteristics generated with radar and satellite precipitation through a distributed hydrologic model are contrasted against reference stream gauge data as a method of integrated validation to assess and quantify error budgets between precipitation products by highlighting precipitation products' accuracy, hydrologic scaling effects, and the impact of the hydrologic model. It is found that systematic and random errors associated with flood characteristics behave similarly to trends previously seen in precipitation rate errors between precipitation products, establishing a clear link through propagation of errors into the water cycle. Additionally, behaviors associated with both water balance and routing schemes within the hydrologic model were shown to affect outputs. Errors generated by water balance tend to cause overestimation of peak discharge values, while errors associated with routing tend to cause underestimation of flood durations and push flood timings earlier than the stream gauge reference. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF