The verification of simulation ability of BCC_CSM climate model in China regional climate change: II height field and weather system

Taking the NCEP/NCAR monthly reanalysis data from 1948 to 2005 as the observation field, the simulation abilities of the BCCCSM model for height field over China, the western Pacific subtropical highs, the South Asia high, and the East Asia major trough are tested by using the standardized Root Mean Square Error (RMSE), correlation coefficient, kriging interpolation methods. Results show that: (1) The standardized RMSE of the simulation for the height fields in summer, autumn and winter are smaller than in spring. The correlation between the simulated field and the real field pass the 0.05 significant test in the most part of China. (2) The changes within a year of the different meteorological elements in China are well simulated. (3) The annual variations of the western Pacific subtropical highs intensity index, area index, west point ridge and ridge line position are well simulated. (4) The annual variations of the South Asia high are basically simulated, but the simulated central position is toward south-west slightly. (5) The variation of the position and the change tendency of intensity index of East Asia major trough are also well simulated by the BCCCSM model.