Low (web) Quality - BALTEX

77
in winter and spring, while substantial underestimations are
identified in summer and fall. The R-2 simulations in these
regions has the similar flaw like regions described above,
overestimating the precipitation in august. For Szechwan
Basin, the WRF simulation is basically underestimating
precipitation all season (except spring), while R-2 generates
substantially larger (smaller) rainfall in fall and winter
(spring and summer). For south of Qinghai-Tibet Plateau,
the WRF simulates larger rainfall than observation except
for august, while the R-2 simulates larger rainfall all year
than the observation. In Western North Xinjiang area, the
WRF simulates larger (smaller) rainfall than the observation
in spring, fall and winter (summer), while the R-2 biases
mainly exist in excessive summer precipitation.
Liang, X.-Z., L. Li, K. E. Kunkel, M. Ting, and J. X. L.
Wang (2004), Regional climate model simulation of
U.S. precipitation during 1982–2002. Part 1: Annual
cycle, J. Climate, 17, 3510–3528.
Machenhauer, B. Windelband, M., Botzet, M., Christensen
J.H., Déqué, M., Jones, R.G, Ruti, P., and Visconti, G.
(1998) Validation and analysis of regional present-day
climate and climate change simulations over Europe
MPI for Meteorology report 275, 87pp.
3. Conclusion
The precipitation simulation is more skillful in DJF/SON
than in MAM/JJA in most area of China, and produces more
convincing results in East China than the west. Hence the
WRF downscaling provides an incredible way to improve
reanalysis data in China, which has its distinct geographical
configurations: west terrain high and low in the east, with
ocean surrounds its south and east. The results that fall and
winter simulation is better than spring and summer are
possible due to the weakness of modeling convections in
spring and summer. Overall, based on a number of objective
measures of climate simulation skill, the WRF reproduces
observed spatial and seasonal precipitation patterns better
than the R-2 simulations.
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