洞庭湖区近百年气温序列构建及其变化特征

采用统计方法并结合气象台站历史沿革信息,对1910-2010年洞庭湖区气温观测资料进行均一性检验和订正,并利用洞庭湖区周边气象台站资料对洞庭湖区1951年以前缺测的气温资料进行插补,构成完整的气温序列。基于洞庭湖区完整气温序列,构建洞庭湖区近百年气温序列并分析其变化特征。结果表明：1910-2010年洞庭湖区年平均气温呈显著上升趋势,其中冬季和春季平均气温上升幅度最大,秋季次之,夏季变化趋势不显著;气温变化存在明显的冷暖交替,冷暖期交替比中国地区更频繁;近百年洞庭湖区年和冬季、春季、秋季平均气温均存在一个显著增暖的突变点;小波分析表明,近百年洞庭湖区年和四季平均气温均经历了冷-暖-冷-暖4个阶段的交替。     

内蒙古地区气温变化的季节和区域差异

利用内蒙古地区1961~2003年101个气象站的月平均气温资料和旋转经验正交函数分解的方法,根据四季气温变化的一致性进行区域的划分,并分析气温变化的季节和区域差异。结果表明:内蒙古地区的四季气温变化存在着明显的东、西分异,春、秋、冬季的气温场划分为东部和西部两大区域,而在夏季,则划分为西部、东南部和东北部三大区域;在年际波动方面,除夏季的东南区以外,近43年中各区四季气温的变化都经历了一次显著的由降而升的转折,转折点大致出现在80年代中、后期或90年代初、中期;在线性趋势方面,东部区春、夏季的升温幅度和显著性大于西部区,而西部区秋、冬季的升温幅度和显著性则大于东部区。一般而言,冬季和夏季升温最为显著,其次是春季,秋季升温最为微弱。     

1900-2009年中国均一化逐月降水数据集研制(英文)

Based on the collection and processing of the China national-wide monthly station observational precipitation data in 1900-2009,the data series for each station has been tested for their homogeneity with the Standard Normalized Homogeneity Test(SNHT) method and the inhomogeneous parts of the series are adjusted or corrected.Based on the data,the precipitation anomalies during 1900-2009 and the climatology normals during 1971-2000 have been transformed into the grid boxes at 5°×5° and 2°×2° resolutions respectively.And two grid form datasets are constructed by combining the normal and anomalies.After that,the missing values for the 5°×5° grid dataset are interpolated by Empirical Orthogonal Function(EOF) techniques.With the datasets of different resolutions,the precipitation change series during 1900-2009 over China's mainland are built,and the annual and seasonal precipitation trends for the recent 110 years are analyzed.The result indicates that the annual precipitation shows a slight dryer trend during the past 110 years,notwithstanding lack of statistical confidence.It is worth noting that after the interpolation of the missing values,the annual precipitation amounts in the early 1900s become less,which increases the changing trend of the annual precipitation in China for the whole 110 years slightly(from-7.48 mm/100a to-6.48 mm/100a).