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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Evaluation of the high-resolution CMORPH satellite rainfall product using dense rain gauge observations and radar-based estimates
Journal of Hydrometeorology, Volume 13, No. 6, Year 2012
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Description
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. © 2012 American Meteorological Society.
Authors & Co-Authors
Habib, Emad H.
United States, Lafayette
University of Louisiana at Lafayette
Haile, Alemseged Tamiru
United States, Lafayette
University of Louisiana at Lafayette
Ethiopia, Addis Ababa
United Nations Economic Commission for Africa, Addis Ababa
Tian, Yudong
United States, College Park
University of Maryland, College Park
Joyce, Robert J.
United States, Washington, D.c.
National Oceanic and Atmospheric Administration
Statistics
Citations: 105
Authors: 4
Affiliations: 4
Identifiers
Doi:
10.1175/JHM-D-12-017.1
ISSN:
1525755X
e-ISSN:
15257541