中国825个基准、基本站地面气压系统误差的检验与订正

使用RHtest均一化方法结合元数据信息对中国825个基准、基本站的地面气压月值数据进行均一性检验与订正，结果发现有400个站的气压数据均一，425个站存在系统误差。对于后者，使用静力模式订正可消除255个站的系统误差，另外170个站采用均值订正，均值订正的断点共245个。对气候趋势和个例的分析表明，上述方法对气压数据均一化订正效果明显。均一化之后站点气压长期趋势的空间一致性更好，中国东南沿海和西北部的新疆地区气压表现出下降趋势，中部地区主要表现出上升趋势。

Homogenization of Monthly Pressure Data at 825 Chinese Stations

A data homogenization procedure was applied to adjust systematic errors in monthly station pressure data series of 825 stations in China for the period 1951-2014. Penalized maximum F-test was applied to examine the homogeneity of the data series and metadata was used to confirm the break points. Results showed that 400 of the 825 sites were confirmed to be homogenous while the other 425 were not. For the latter, firstly, the hydrostatic model was applied to adjust the errors caused by the use of incorrect station elevation values. Then statistical approaches (mean adjustment) were applied when a physical-based correction was in vain due to lack of correct metadata. As a result, pressure data for 255 of the 425 inhomogeneous sites were homogenized by the hydrostatic model, and for additional 170 sites were homogenized with the mean adjustment method. By comparing the trend of the raw and homogenized data, it was found that after homogenization the pattern exhibits a better spacial consistency, and the east coast and the northwest parts of China show a decrease trend while the middle part an increase one.