摘要
利用陕南及周边28个气象站点1981年-2010年的气温数据,运用Mann-Kendall检验方法和经验正交函数法(Empirical Orthogonal Function,EOF)对数据进行计算和分析,获得陕南气温变化随时间的变化情况和空间分布特征。结果表明:①研究时段内陕南气温总体呈波动上升趋势,1994年为突变点,之后,陕南增温尤为明显;②陕南气温变化分布场具有明显的特征,主要表现为:受纬度影响温度变化呈现出南高北低;受地形地貌影响呈现出山区和盆地气温变化具有相反趋势;受季风气候影响表现出东西部气温变化具有相反趋势;受大范围大气状况影响气温变化具有普遍高温或普遍低温趋势;③陕南气温空间场对应的时间系数具有明显的年际变化和年内变化,且年内波动性越来越强。
During the past century, global climate has gone through a significant change of which global warming is the main characteristic. As the water source of Middle Route Project of South-to-North Water Transfer Project in China, the temperature change of Southern Shaanxi has been much concerned. Besides, enriching the study of temperature changes in southern Shaanxi can provide a strong basis for industrial and agricultural production, ecological and environmental protection and the government work in this area. Using the temperature data during 1980-2010 from 28 meteorological stations in southern Shaanxi and surrounding areas, we have got the feature vector distribution of temperature and the time-coefficient series with methods of Empirical Orthogonal Function （EOF） and Mann-Kendall. The innovation points of this study are that it has analyzed the situation of temperature change with time in southern Shaanxi as well as the spatial distribution pattern of temperature change in this region. The research results show that： 1） During the study period, the temperature of southern Shaanxi showed a wavelike rising tendency with 1994 as the point of abrupt change; 2） The distribution of temperature changes in southern Shaanxi has obvious characteristics： affected by the latitude, the temperature is high in south and low in north; affected by the topography, the temperature change in mountains shows an opposite trend to that in basins; affected by the monsoon climate, there is also an opposite trend of temperature changes between eastern and western regions; it is a common trend that most areas share high temperature or low temperature; 3） The time-coefficient series of temperature field has a significant inter-annual variation, and the fluctuation continues to grow stronger during the year. Mann-Kendall and EOF can greatly reveal the spatial and temporal characteristics of temperature changes in the study area, but there are relatively short time series and small space points in this study. From now on, we could combine temperature changes with precipitation changes so as to better reflect the hydrothermal conditions in the research area.
出处
《资源科学》
CSSCI
CSCD
北大核心
2012年第5期927-932,共6页
Resources Science
基金
国家自然科学基金项目(编号:41071057
41001388)
国家社会科学基金项目(编号:11BJY031)
陕西省教育厅基金项目(编号:11JK0748)
陕西理工学院基金项目(编号:SLG0930
SLGH1245)
关键词
EOF
陕南
气温
时空分布
EOF
Southern Shaanxi
Temperature
Temporal and spatial distribution
