Lee, Junhong, Hyeyum Hailey Shin, and Song-You Hong, Yonsei
University, Department of Atmospheric Sciences, Seoul, Korea
The objective of this
study is to investigate the impacts of surface-layer physics processes that
were introduced in WRF V3.4 on heavy rainfall simulations over Korea. One of
the revisions was suggested for improving the representation of resolved and
unresolved topographic effects on surface wind, by solving a high surface wind
speed bias problem over lands. The other is a revised surface layer scheme.
This revision includes modified similarity functions that are more suitable
under strong stable/unstable conditions and reduces or suppresses the
non-physical artificial limits that are imposed on certain variable. WRF
version 3.4 is used to verify the impacts of these two schemes in reproducing a
heavy rainfall event with local maximum of 339.0 mm and maximum intensity of
77.5 mm h-1 that occurred over Korea, on 11-13 July 2006.