Journal
JOURNAL OF HYDROMETEOROLOGY
Volume 13, Issue 3, Pages 1142-1148Publisher
AMER METEOROLOGICAL SOC
DOI: 10.1175/JHM-D-11-0121.1
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Funding
- Research Program on Climate Change Adaptation, Ministry of Education, Culture, Sports, Science and Technology (RECCA/MEXT)
- Core Research for Evolutional Science and Technology, Japan Science and Technology Agency (CREST/JST)
- Korea Meteorological Administration Research and Development Program [CATER 2010-2210]
- Korea Meteorological Administration [CATER 2010-2210] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The diurnal characteristics of summer rainfall in the contiguous United States and northern Mexico were examined with the United States reanalysis for 5 years in 10-km horizontal resolution (US10), which is dynamically downscaled from the National Centers for Environmental Prediction National Center for Atmospheric Research (NCEP-NCAR) Global Reanalysis 1 using the Regional Spectral Model (RSM). The hourly precipitation outputs demonstrate a realistic structure in the temporal evolution of the observed rainfall episodes and their magnitudes across the United States without any prescriptions of the observed rainfall to the global reanalysis and the downscaled regional reanalysis. Nighttime rainfall over the Great Plains associated with eastward-propagating, mesoscale convective systems originating from the Rocky Mountains is also represented realistically in US 10, while the original reanalysis and most general circulation models (GCMs) have difficulties in capturing the series of nocturnal precipitation events in summer over the Plains. The results suggest an important role of the horizontal resolution of the model in resolving small-scale, propagating convective systems to improve the diurnal cycle of summer rainfall.
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