塔克拉玛干沙漠腹地沙尘气溶胶质量浓度垂直分布特征   总被引：4，自引：0，他引：4  

刘新春  钟玉婷  何清  杨兴华  艾力·买买提明 《中国沙漠》2012,32(4):1045-1052

 利用Grimm 1.108、Thermo RP 1 400 a以及TSP等仪器于2009年1月至2010年2月对塔克拉玛干沙漠腹地塔中不同高度沙尘气溶胶质量浓度进行连续观测,结合天气资料进行分析。结果表明:①80 m高度PM10质量浓度最高,80 m高度PM2.5和PM1.0质量浓度明显低于4 m高度PM10,80 m高度PM1.0质量浓度最低。频繁的沙尘天气是影响不同粒径的沙尘气溶胶浓度含量的主要因素。②夜间至日出,PM质量浓度逐渐降低,最低基本上出现在08:00,随后质量浓度逐渐增大,18:00前后浓度达到最高值,然后又逐步降低。其规律与风速的昼夜变化完全一致。③TSP月平均质量浓度高值主要集中在3—9月,其中4月和5月浓度最高,随后逐渐减低。3—9月也是PM月平均质量浓度的高值区域,4 m高度PM10月平均质量浓度最高发生在5月,其浓度为846.0 μg·m-3。80 m高度PM10浓度远高于PM2.5和PM1.0浓度,PM2.5和PM1.0浓度相差较小。风沙天气对大气中的不同粒径粒子的浓度含量影响较大,风沙天气越多,粗颗粒含量越高,反之则细颗粒越多。④沙尘天气过程中不同粒径沙尘气溶胶质量浓度变化具有晴天<浮尘天气<扬沙天气<沙尘暴天气的规律。各种沙尘天气中,PM10/TSP表现为晴好天气高于浮尘天气,浮尘天气远高于扬沙和沙尘暴天气。⑤沙尘天气过程中,沙尘气溶胶浓度随着粒径的减小,浓度逐渐降低。不同高度、不同粒径的沙尘气溶胶质量浓度每隔3~4 d形成一个峰值区,与每隔3~4 d出现沙尘天气强度增强过程直接相关。  相似文献   

乌鲁木齐地区一次强沙尘天气过程分析     

阿吉古丽·沙依提  艾力·买买提明  哈依霞·哈力  薛福民  黄洁 《沙漠与绿洲气象(新疆气象)》2008,2(5):28-31

利用环境监测资料、常规气象资料、高低空环流形势数据和卫星遥感图像资料,对2004年4月19日造成乌鲁木齐地区强沙尘天气的天气背景进行了系统的分析。结果表明,此次天气过程在北疆沿天山88°E一带产生了严重风沙灾害。乌鲁木齐市可吸入颗粒物浓度从沙尘天气前的0.79mg/m3猛增到沙尘天气发生时的10.0mg/m3,API指数为500,属于重度污染。沙尘天气发生前后,乌鲁木齐市温度、气压、风速以及能见度发生了显著的变化。其中,风速>17m/s的大风持续时间较长,能见度降到了很低的水平,乌鲁木齐以外的地区能见度甚至降到了强沙尘暴能见度级别;由卫星云图、高低空环流形势分析和物理量分析可以得出,造成2004年4月19日强沙尘天气的主要原因是冷锋过境。锋前的抬升作用和高低空散度场的配置是沙尘天气的启发因素,而持续时间较强的锋后西北风是产生此次强沙尘天气的主要动力。  相似文献   

浅成热液型Pb-Zn-(Ag)-(Au)-(Cu)多金属矿床研究进展     

高建京  叶会寿  陈懋弘  木合塔尔.买买提明 《矿床地质》2010,29(Z4):185-186

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Eckfeld Maar: Window into an Eocene Terrestrial Habitat in Central Europe   总被引：1，自引：1，他引：0  

Herbert Lutz  Uwe KaulfuSS  Torsten Wappler  Werner L?hnertz  Volker Wilde  Dieter F. Mertz  Jens Mingram  Jens L. Franzen  Herbert Frankenh?user  Martin Koziol 《《地质学报》英文版》2010,84(4):984-1009

<正>To mark the occasion of the 175th anniversary of the Rheinische Naturforschende Gesellschaft in 2009 and of the centennial of the Mainz Natural History Museum in 2010,we present a short account of our present knowledge of the Eckfeld Maar after 20 years of continuous research.This paper does not attempt to include all of the detailed results on the geology of the Eckfeld site or its biota.To date,nearly 250 papers and books have been published since the start of our project.An up-to-date list of these publications can be found at www.eckfeldermaar. de.  相似文献   

Hydrogeochemistry and Water Quality Evaluation along the Flow Path in the Unconfined Aquifer of the Düzce Plain,North-western Turkey     

Nail üNSAL  Mehmet ?EL?K 《《地质学报》英文版》2010,84(1):213-222

The Düzce Plain has a multi-aquifer system, which consists of a near surface unconfined aquifer, along with first and second deeper confined aquifers. Hydrochemical evolution and water quality are related to infiltration of the precipitation, recharge from the formations surrounding the plain, flow path of groundwater and the relationship between surface and groundwater. The groundwater in the unconfined aquifer flows towards the Efteni Lake and the Büyük Melen River. Surface waters are divided into two main hydrochemical facies in the study area: (a) Ca2+–HCO3?; and (b) Ca2+, Mg2+–HCO3-, SO42-. The groundwater has generally three main hydrochemical facies: (a) Ca2+–HCO3-; (b) Ca2+, Mg2+–HCO3-; and (c) Ca2+, Mg2+–HCO3-, Cl-. The hydrochemical facies "a" and "b" dominate within shallow depths in recharge areas under rapid flow conditions, while hydrochemical facies "c" characterizes shallow and mixed groundwater, which dominate intermediate or discharge areas (near Efteni Lake and Büyük Melen River) during low flow conditions and agricultural contamination. Calcium and bicarbonate ions, total hardness and electrical conductivity of total dissolved solids (EC–TDS) values increase along the groundwater flow path; but these parameters remain within the limits specified by the standards set for industrial and agricultural usages.  相似文献   

A New Species of Dactylolabis (Eobothrophorus) from Baltic Amber (Diptera:Limoniidae)   总被引：1，自引：1，他引：0  

Wies?aw KRZEMINSKI  Iwona KANIA  and Ewa KRZEMINSKA 《《地质学报》英文版》2010,84(4):768-771

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Mesozoic Evaniidae (Insecta: Hymenoptera) in Spanish Amber: Reanalysis of the Phylogeny of the Evanioidea     

Enrique PE?ALVER  Jaime ORTEGA-BLANCO  André NEL  Xavier DELCLòS 《《地质学报》英文版》2010,84(4):809-827

<正>One new genus and five new species of the family Evaniidae are described from the Early Cretaceous (Albian)Spanish amber of Penacerrada-Ⅰ(Province of Burgos),San Just and Arroyo de la Pascueta(both in the Province of Teruel):Cretevania alonsoi sp.nov.,C.montoyai sp.nov.,C.alcalai sp.nov.,C.rubusensis sp.nov.,and Iberoevania roblesi gen.and sp.nov.Taxonomic changes include Cretevania pristina(Zhang and Zhang,2000) comb.nov.,C.exquisita(Zhang,Rasmtsyn,Wang and Zhang,2007)comb.nov.,C.vesca(Zhang,Rasnitsyn,Wang and Zhang,2007)comb.nov.,and C.cyrtocerca(Deans,2004)comb.nov.,as a result of the reinterpretation of the genera Procretevania and Eovernevania.The new well preserved specimens of the genus Cretevania,together with the characters shown by the type specimens of the synonymized genera,give new information about their anatomical characters of taxonomical importance,and the genus Cretevania Rasnitsyn,1975 is re-diagnosed.The holotypes of the Russian species in amber have been revised.A cladistic analysis of fossil and extant groups of the superfamily Evanioidea is included.Cretevania had a wide palaeogeographic distribution,with the highest diversity known from Spain.The 13 known Cretevania species show a high interspecific variation mainly in wing characteristics,and a wide range of body and wing size.  相似文献   

2000年以来库尔勒市果树冻害气象条件综合分析     

李海燕  杨诗芳  巴哈古力?买买提 《沙漠与绿洲气象(新疆气象)》2010,4(2):55-58

2000年以来,巴州地区出现了3次较明显的冻害天气,其中库尔勒2次,焉耆盆地和静1次。本文从低温天气前期气候特征、低温强度及持续时间、积雪、地温、冻土深度等方面入手对库尔勒2000年以后的2次果树冻害天气进行综合分析,找出能提前表征果树冻害的相关气象参数,为巴州林果业气象决策服务提供必要参考,提高气象防灾减灾能力。  相似文献   

WILD T_3经纬仪竖盘光路检修工艺   总被引：1，自引：0，他引：1  

黄永? 《测绘通报》1980,(6)

由于T_3仪器的竖盘光路采用与T_2不同的结构，因此竖盘光路的检修具有其特殊性。本文着重介绍竖盘的拆卸步骤，同时介绍一种简单的竖盘光路调整附加设备，从而简化了光路的调整。  相似文献   

北京天文台1997年发现四颗激变变星     

艾力  伊 《天体物理学报》1998,19(2):214-216

在１９９７年进行超新星巡天时,北京天台发现了四颗处于极大期的激变变星,本给出了它们的位置,观测参数以及证认图的光谱图。  相似文献