新疆阿勒泰地区地气温差变化特征分析   总被引：1，自引：0，他引：1  

庄晓翠  张林梅  刘大锋   《气象与环境科学》2009,32(4):13-19

利用阿勒泰地区7个气象站1963-2004年0 cm地温和气温月平均资料,采用统计法、趋势和突变检验方法,分析了该地区地气温差的时空演变特征及突变.研究表明:该地区地气温差6月最大,12月最小;暖季最大,冬季最小,常年存在随季节变化的高低值区域与海拔和地形有关.地气温差受大尺度气候异常的影响,第一载荷向量场反映全区一致的性质,第二、三载荷向量场具有南北差异和东西差异.线性趋势分析表明,地气温差12月-次年2月呈显著下降趋势,4-9月和年均呈显著上升趋势,过渡季节3月和10-11月趋势变化不显著.突变检验表明,10-11月、12月-次年2月该地区地气温差在20世纪60年代末到70年代初发生了显著的突变,与其他文献的结论不同;3月、4-9月和年均在20世纪70年代末到80年代初发生了显著的突变,与其他文献的结论及新疆气候的突变较为一致.  相似文献   

含粘土热溶尾渣中钾组分的判断及处理          下载免费PDF全文

张柏顺  郑少春  陈洪 《盐湖研究》2005,13(3):41-45

通过对含粘土热溶尾渣构成组分的分析,提出判断钾在热溶尾渣中附存状态的方法,为生产氯化钾的热溶———冷结晶工艺优化提供依据,并估计添加过滤设备经济效益。  相似文献   

江苏城市人居环境空间差异定量评价研究   总被引：18，自引：0，他引：18  

刘钦普  林振山  冯年华 《地域研究与开发》2005,24(5):30-33

文章首先以经济、社会和生态环境因素为基础,建立江苏省主要城市人居环境综合评价三级指标体系——指标类、指标组、单项指标。根据36个单项指标,通过主成分分析和聚类分析的方法,把江苏省13个省辖市人居环境分为3个类型:第一类是南京、无锡、苏州;第二类是连云港、常州、南通、徐州、镇江、扬州、盐城、泰州;第三类是淮安和宿迁。最后分析了该省城市人居环境空间差异的原因,并提出了建设最佳城市人居环境的建议。  相似文献   

湖南省区域经济综合发展水平动态变化研究   总被引：2，自引：0，他引：2  

邹君 《地域研究与开发》2005,24(3):16-19

文章运用创新的主成分分析方法构建测度模型,对湖南省的14个地区进行了区域经济发展水平的动态测算。在研究的时间段中,湖南省的区域经济发展水平都有不同程度的增长,但是增长的幅度有较大的差异。导致区域经济的地区绝对差异拉大,而相对差异有所缩小。经济发展水平的增长能力差异是影响地区经济发展水平动态变化的主要因素。  相似文献   

Estimation of areal precipitation in the Qilian Mountains based on a gridded dataset since 1961   总被引：1，自引：1，他引：0  

Fang Qiang  Mingjun Zhang  Shengjie Wang  Yangmin Liu  Zhengguo Ren  Xiaofan Zhu 《地理学报(英文版)》2016,26(1):59-69

Based on a 0.5°×0.5° daily gridded precipitation dataset and observations in meteorological stations released by the National Meteorological Information Center, the interannual variation of areal precipitation in the Qilian Mountains during 1961-2012 is investigated using principal component analysis (PCA) and regression analysis, and the relationship between areal precipitation and drought accumulation intensity is also analyzed. The results indicate that the spatial distribution of precipitation in the Qilian Mountains can be well reflected by the gridded dataset. The gridded data-based precipitation in mountainous region is generally larger than that in plain region, and the eastern section of the mountain range usually has more precipitation than the western section. The annual mean areal precipitation in the Qilian Mountains is 724.9×10⁸ m³, and the seasonal means in spring, summer, autumn and winter are 118.9×10⁸ m³, 469.4×10⁸ m³, 122.5×10⁸ m³ and 14.1×10⁸ m³, respectively. Summer is a season with the largest areal precipitation among the four seasons, and the proportion in summer is approximately 64.76%. The areal precipitation in summer, autumn and winter shows increasing trends, but a decreasing trend is seen in spring. Among the four seasons, summer have the largest trend magnitude of 1.7×10⁸ m³×a^-1. The correlation between areal precipitation in the mountainous region and dry-wet conditions in the mountains and the surroundings can be well exhibited. There is a negative correlation between drought accumulation intensity and the larger areal precipitation is consistent with the weaker drought intensity for this region.  相似文献   

利用融合方法提升WorldView短波红外影像分辨率     

赵展  卢莹  夏旺  闫利 《测绘通报》2017,(12):16-20

WorldView卫星在8个可见光-近红外多光谱波段的基础上,新增加的8个短波红外（简称SWIR）影像,大大提高了地物信息提取能力。但短波红外影像分辨率与多光谱影像相比分辨率过低,影响应用效果。本文提出了一种结合主分量变换和非下采样小波变换的影像融合方法来提升WorldView短波红外影像的空间分辨率。定量指标和目视评价证明本文提出的融合方法具有较好的融合效果,能够在显著提升短波红外影像空间分辨率的同时很好地保持原始光谱特性。  相似文献   

An approach for measuring social vulnerability in context: The case of flood hazards in Muzarabani district,Zimbabwe     

《Geoforum》2017

Understanding the complexity of vulnerability to disasters, including those triggered by floods, droughts and epidemics is at the heart of disaster risk reduction. Despite its importance in disaster risk reduction, there remains a paucity of approaches that contribute to our understanding of social vulnerability that is hidden in dynamic contextual conditions. The study demonstrates an accessible means to assessing the spatial variation of social vulnerability to flood hazards and related for the context of Muzarabani district in northeast Zimbabwe. The study facilitated local identification with residents of variables contributing to social vulnerability and used the principal component analysis (PCA) technique to develop a social vulnerability index (SoVI). Using ArcMap10.2 geographic information systems (GIS) tool, the study mapped composite SoVI at the ward level. The results showed that Muzarabani district is socially vulnerable to hazards. The social vulnerability is influenced by a variety of economic, social and institutional factors that vary across the wards. Quantifying and visualising social vulnerability in Muzarabani provides useful information for decision makers to support disaster preparedness and mitigation programmes. The approach shows how spatially distributed multivariate vulnerability, as grounded in interpretations at local level, can be quantitatively derived for contexts such as those of Muzarabani. The study findings can inform disaster risk reduction communities and cognate disciplines on quantitative assessments for managing hazard vulnerability where these have hitherto not been developed.  相似文献   

Residues and Organic Contaminants in Agricultural Soils in Intensive Agricultural Areas of Spain: A Three Years Survey          下载免费PDF全文

Juan A. Padilla‐Sánchez  Roberto Romero‐González  Patricia Plaza‐Bolaños  Antonia Garrido Frenich  José L. Martínez Vidal 《洁净——土壤、空气、水》2015,43(5):746-753

  相似文献   

基于金刚烷特征比值的主成分分析方法进行原油鉴别     

杨佰娟  侯伟  王小如 《海洋科学》2013,37(2):84-88

基于原油中金刚烷生物标志物的特征诊断比值,采用主成分分析,对17个不同来源的原油样品进行主成分分析,结果显示:涠洲岛海上不同采油平台原油样为一大类,渤海海上不同采油平台的原油为第二类,7个国外进口原油由于油样来源地区差异比较大。基于原油中金刚烷特征诊断比值的主成分分析可以实现差异较大原油大量样品的快速分离,但对差异较小的油样分辨力仍存在一定局限。  相似文献   

Methods to quantify components of the excavating sponge Cliona orientalis Thiele, 1900     

James K. H. Fang  Christine H. L. Schönberg  David I. Kline  Ove Hoegh‐Guldberg  Sophie Dove 《Marine Ecology》2013,34(2):193-206

This study applied the loss after combustion (LAC) method and the acid decalcification (ADC) method to quantify different components of an excavating sponge. Samples of dried coral skeleton of Favia sp. invaded by the Indo‐Pacific excavating sponge Cliona orientalis Thiele, 1900 were used. The sponge tissue penetrated the 12‐mm‐thick samples to approximately 10 mm. The average proportional weight of organic matter, siliceous spicules, calcareous substrate and salts in the entire samples was found to be respectively 2.5%, 4.4%, 90.5% and 2.5% of dry weight applying the LAC method, and 2.9%, 5.9%, 89.0% and 2.3% of dry weight applying the ADC method. Respective volumetric proportions of the organic matter, spicules, substrate and salts were then calculated to be 6.4%, 5.5%, 85.2% and 3.0% of volume with the LAC method, and 7.4%, 7.2%, 82.7% and 2.7% of volume with the ADC method. The LAC method showed low variability of data and is simple and fast and therefore is recommended. The ADC method generated very similar results to the LAC method. However, due to the handling involved in the ADC method, more than half of the spicules may be lost and the method is therefore not recommended unless careful data corrections are considered. In addition, the buoyant weight method was used to quantify actual substrate weight in the fresh sponge‐substrate samples. This method was found to be at least 97% effective, revealing that buoyant weights can potentially be used to quantify bioerosion rates of excavating sponges. To our knowledge, this is the first study to systemically quantify organic and inorganic components of an excavating sponge and its calcareous substrate, providing improved standard methods for future studies.  相似文献