Impacts of Spectral Nudging on the Sensitivity of a Regional Climate Model to Convective Parameterizations in East Asia |
| |
Authors: | Shi Song Jianping Tang Xing Chen |
| |
Institution: | (1) School of Atmospheric Sciences, Nanjing University, Nanjing, China;(2) School of Atmospheric Sciences, Yunnan University, Kunming, China |
| |
Abstract: | The sensitivity of a regional climate model (RCM) to cumulus parameterization (CUPA) schemes in modeling summer precipitation
over East Asia has been investigated by using the fifth-generation Pennsylvania State University-National Center for Atmospheric
Research Mesoscale Model (PSU-NCAR MM5). The feasibility of physical ensemble and the effect of interior (spectral) nudging
are also assessed. The RCM simulations are evaluated against the NCEP/NCAR reanalysis data and NCEP/CPC precipitation data
for three summers (JJA) in 1991, 1998, and 2003. The results show that the RCM is highly sensitive to CUPA schemes. Different
CUPA schemes cause distinctive characteristics in the modeling of JJA precipitation and the intraseasonal (daily) variability
of regional precipitation. The sensitivity of the RCM simulations to the CUPA schemes is reduced by adopting the spectral
nudging technique, which enables the RCM to reproduce more realistic large-scale circulations at the upper levels of the atmosphere
as well as near the surface, and better precipitation simulation in the selected experiments. The ensemble simulations using
different CUPA schemes show higher skills than individual members for both control runs and spectral nudging runs. The physical
ensemble adopting the spectral nudging technique shows the highest downscaling skill in capturing the general circulation
patterns for all experiments and improved temporal distributions of precipitation in some regions. |
| |
Keywords: | regional climate model (RCM) cumulus parameterizations spectral nudging ensemble East Asian summer precipitation |
本文献已被 CNKI SpringerLink 等数据库收录! |
| 点击此处可从《Acta Meteorologica Sinica》浏览原始摘要信息 |
| 点击此处可从《Acta Meteorologica Sinica》下载免费的PDF全文 |