Evaluation of the High-Resolution CMORPH Satellite Rainfall Product Using Dense Rain Gauge Observations and Radar-Based Estimates
- 1 December 2012
- journal article
- Published by American Meteorological Society in Journal of Hydrometeorology
- Vol. 13 (6), 1784-1798
- https://doi.org/10.1175/jhm-d-12-017.1
Abstract
This study focuses on the evaluation of the NOAA–NCEP Climate Prediction Center (CPC) morphing technique (CMORPH) satellite-based rainfall product at fine space–time resolutions (1 h and 8 km). The evaluation was conducted during a 28-month period from 2004 to 2006 using a high-quality experimental rain gauge network in southern Louisiana, United States. The dense arrangement of rain gauges allowed for multiple gauges to be located within a single CMORPH pixel and provided a relatively reliable approximation of pixel-average surface rainfall. The results suggest that the CMORPH product has high detection skills: the probability of successful detection is ~80% for surface rain rates >2 mm h−1 and probability of false detection <3%. However, significant and alarming missed-rain and false-rain volumes of 21% and 22%, respectively, were reported. The CMORPH product has a negligible bias when assessed for the entire study period. On an event scale it has significant biases that exceed 100%. The fine-resolution CMORPH estimates have high levels of random errors; however, these errors get reduced rapidly when the estimates are aggregated in time or space. To provide insight into future improvements, the study examines the effect of temporal availability of passive microwave rainfall estimates on the product accuracy. The study also investigates the implications of using a radar-based rainfall product as an evaluation surface reference dataset instead of gauge observations. The findings reported in this study guide future enhancements of rainfall products and increase their informed usage in a variety of research and operational applications.Keywords
This publication has 32 references indexed in Scilit:
- Evaluation of satellite-retrieved extreme precipitation rates across the central United StatesJournal of Geophysical Research, 2011
- Benchmarking High-Resolution Global Satellite Rainfall Products to Radar and Rain-Gauge Rainfall EstimatesIEEE Transactions on Geoscience and Remote Sensing, 2009
- Product-Error-Driven Uncertainty Model for Probabilistic Quantitative Precipitation Estimation with NEXRAD DataJournal of Hydrometeorology, 2007
- Validation of satellite rainfall products over East Africa's complex topographyInternational Journal of Remote Sensing, 2007
- Comparison of Near-Real-Time Precipitation Estimates from Satellite Observations and Numerical ModelsBulletin of the American Meteorological Society, 2007
- Characterization of the temporal sampling error in space‐time‐averaged rainfall estimates from satellitesJournal of Geophysical Research: Solid Earth, 2004
- Local Random Errors in Tipping-Bucket Rain Gauge MeasurementsJournal of Atmospheric and Oceanic Technology, 2003
- Intercomparison of Global Precipitation Products: The Third Precipitation Intercomparison Project (PIP–3)Bulletin of the American Meteorological Society, 2001
- Effects of Nonuniform Beam Filling on Rainfall Retrieval for the TRMM Precipitation RadarJournal of Atmospheric and Oceanic Technology, 1998
- An Introduction to the BootstrapPublished by Springer Science and Business Media LLC ,1993