Anthropogenic Sulfate and Nitrate Signals in Snow from Bogda Glacier, Eastern Tianshan

A 1.2 m snow pit was recovered on July 29th, 2009 from the Bogda Glacier, eastern Tianshan (天山). The sample site temperature of -9.6 ℃ indicates that the unique glaciochemical re-cord was well preserved and suitable for the reconstruction of air pollution levels in this previously un-explored region. Samples were analyzed for major ions (Na+, K+, Ca2+, Mg2+, NH4+, Cl-, SO42-, NO3-, HCOO-, and CH3COO-). NO3- and SO42- were characterized by significant high levels of pollution con-centration. Most air masses ...     

Monitoring Glacial Shrinkage Using Remote Sensing and Site-Observation Method on Southern Slope of Kalik Mountain, Eastern Tian Shan, China

Currently, one of the effective means in monitoring glacier change in regional scale is remote sensing and site-observation method. In this article, we present a study of comparing glacier area in 2005 derived from SPOT5 satellite image with area in 1972 derived from topographic maps. Moreover, Miaoergou (庙儿沟) flat-summit glacier is site observed to verify glacial change in regional scale. During the study period, glaciers located in the southern slope of Kalik (喀尔里克) Mountain re-duced their area by 12.3%. ...     

陇中和鲁西南乡村居民对当地气候变化感知研究

基于问卷调查、气温和降水资料等气象资料以及农业灾害资料,分析甘肃省会宁县和山东省单县乡村居民对当地气候变化感知情况,探讨影响感知的因素.研究发现,绝大部分受访者在大部分情况下正确感知到气候变化,但感知及其影响因素较复杂.气候变化及其产生的影响是制约人们感知的最重要的要素,决定了感知的总体特征;感知也受相较调查时间而言较...     

Comprehensive precursor anomaly research based on earthquake corresponding relevancy spectrum

With the aim to the quantification of anomaly identification and extraction for observed or analyzed records, we present two statistical methods of earthquake corresponding relevancy spectrum(ECRS)and sliding mean relevancy (SMR).With ECRS method,we can obtain the abnormal confidence attribute of data in different value ranges.Based on the relevancy spectrum in different studied time-intervals,we convert the original time sequence into relevancy time sequence, and can obtain the SMR time series by using the...     

植物中单体烷烃碳同位素组成与其生长环境的关系

用色谱一同位素质谱议对青藏高原东北部高寒草甸生态系统中的两种高等模特一火绒草（Ｌｅｏｎｔｏｐｏｄｉｕｍ ｌｅｏｎｔｏｐｏｄｉｏｉｄｉｅｓ）和蒲公英（Ｔａｒａｘａｃｕｍ ｍｏｎｇｏｌｉｕｍ）的烷烃进行分析,讨论环境因素对植物单体烷烃碳同位素组成（δ＾１３Ｃｉａ）的影响。研究发现,两种植物奇碳数正构烷烃的δ＾１３Ｃｉａ值都比较小,且有随海拔高度的增加而增大的趋势,而偶碳数正构烷烃的δ＾１３Ｃｉａ值可能     

鄂尔多斯盆地西峰油田原油地球化学特征及其成因

通过对鄂尔多斯盆地西峰油田原油进行系统地采样和高分辨率的GC-MS、IRMS分析,研究了原油的生物标志化合物和碳同位素组成特征,并且进行了油源对比,探讨了其成因。研究资料指示了所研究原油属于同一成因类型;原油有机母质为菌藻类和高等植物,特别是高等植物为原油的形成作出了贡献;原油形成于弱还原和淡水或微咸水环境;原油均为成熟原油;原油地球化学特征和上三叠统延长组长,油层组具有亲缘关系,反映了原油主要来源于长,油层组。这些研究结果为盆地的石油勘探提供了科学依据。     

高台车站断裂全新世活动特征

高台车站断裂属于河西走廊内次级隆起——榆木山隆起北侧断裂系的组成部分,它位于榆木山北缘断裂北侧6km、是与榆木山隆起有成生联系、活动时间比北缘断裂更新的现代活动断裂。高台车站断裂呈向北北东略微凸出的弧形,走向总体为北西向,倾向南西,自南东向北西走向由北西向渐变为北西西、甚至近东西向,倾角自中等变化为低角度。高台车站断裂的活动性质在剖面上表现为南西盘向上逆冲为主、水平位移不明显,在近两万年以来的晚更新世晚期—全新世期间,该断裂可能发生过5期明显的新构造活动,活动时间具有自东向西逐渐变新的迁移性特点,最新一次在2.0~3.0ka左右,与高台地震时间是吻合的,它是高台地震的发震构造。     

祁连山地震带两次中强地震前的加卸载响应比异常

研究了祁连山地震带两次中强地震前的加卸载响应比异常特征，讨论了基于天然地震序列的样本条件对加卸载响应比计算结果的影响，提出处理序列中4．0级以上地震的新方法。     

TURBULENCE STRUCTURE AND TRANSFER CHARACTERISTICS IN THE SURFACE LAYER OF HEIFE GOBI AREA

Based on the HEIFE 1988 and 1990 pilot observations,an analysis on the turbulence structure of Gobi surfacelayer,mainly on the similarity formulations of wind and temperature variances,the spectra and cospectracharacteristics,is presented.The phenomenon of downward water vapor flux over Gobi desert in daytime is confirmedin both observations,this and the well-known‘oasis effect’are two sides of a local mesoscale circulation.     

OBSERVATION AND MODEL ANALYSES OF POSITIVE CLOUD-TO-GROUND LIGHTNING IN MESOSCALE CONVECTIVE SYSTEMS

The analyses of spatial and temporal characteristics of positive cloud-to-ground(CG)lightning for four mesoscaleconvective systems and two severe local convective systems in 1989 and 1990 show that positive CG flash rate usuallyhas two peak values.The major peak occurs during the developing stage of the storm and most of the positive CGflashes originate at the lower part of the storm.The minor occurs during the dissipative stage of the storm and most ofthe positive CG flashes originate at the upper part of the storm,especially in the region of the wind divergence in thestorm anvil.The positive CG flash rate is almost an order of magnitude larger in the developing stage than in thedissipative stage.The appearing time of the peak of negative CG flash rate is in accordance with that of the valley of pos-itive CG flash rate.The higher the intensity of the radar echo,the higher the positive CG flash rate.Most of the positive CG flashes oc-cur when the weak echo area is larger,and mostly originate in the region where the radar echo intensity is about 10dBzand in the back region of the moving storms.The spatial distribution of the positive CG flashes is much more dispersivethan that of the negative.The mesoscale analysis reveals a bipolar lightning pattern.The mean bipole--length reaches itsminimum during the mature stage of the storm and reaches the maximum during the developing stage of the storm.The vertical distribution of the charge density is calculated by a one-dimensional charging model.Then,we discussthe producing condition of the positive CG lightning and forming cause of charge structure mentioned above.