【摘要】 本文用Ｃｒｅｓｍａｎ逐步订正法和青藏高原气象科学实验资料对高原地区１９７９年６—８月中６０个时次的ＦＧＧＥⅢｂ级资料相对湿度场进行了订正和分析，然后利用一有限区域数值模式，选择两例高原低涡过程，用订正前后的ＦＧＧＥⅢｂ相对湿度资料分别作初始湿度场进行了７２ｈ和４８ｈ预报试验。结果表明：高原地区相对湿度的高值区位于其东南部，然后向西北逐渐递减，低值区位于高原西部。ＦＧＧＥⅢｂ相对湿度场能较好地反映高原东部的分布，但在高原西部比实际明显偏大。订正高原上的初始湿度场（ＦＧＧＥⅢｂ相对湿度场）能明显改进高原地区的降水和形势预报，对环流的影响可达到高原东侧并波及高原的南北侧地区，显示了加密高原西部资料的重要性。更多还原

【Abstract】 In the paper, sixty times relative humidity fields of FGGE level Ⅲb data over the Qinghai-Xizang Plateau were analysed and corrected by using of the observed data during QXPMEX and Cressman’s successive correction method. Then two cases of the Qinghai-Xizang Plateau vortices were chosen and their 72 h or 48 h forecasting experiments were performed by utilizing a limited numerical model, incorrected and corrected FGGE level Ⅲb relative humidity data as the model initial fields. The results show that relative humudity has a high value,it is located over the south-east area of the Qinghai-Xizang Plateau,then it moves successively northward and the minimum is located over the western Qinghai-Xizang Plateau. FGGE level Ⅲb data give a rather real distribution of relative humidity over the eastern Qinghai-Xizang Plateau, but the relative humidity values were overestimated over the western Qinghai-Xizang Plateau; the pattern and precipitation forecasted over the Qinghai-Xizang Plateau can obviously be improved and even predicted circulations can be influenced to the east, north and south flank of the Qinghai-Xizang Plateau by correcting the model initial relative humidity field (that of FGGE level Ⅲb data), which indicates the importance of intensive observational data over the western Qinghai-Xizang Plateau.更多还原