基于高空气球平台的下投探空:系统研发和青藏高原实验          下载免费PDF全文

Jinqiang Zhang  Hongbin Chen  Yunfei Du  Wenzheng Shao  Runping Zeng  Keping Zhu  Yi Liu  Yuejian Xuan 《大气和海洋科学快报》2021,14(3):30-35

为提高复杂地理环境和极端天气条件下的大气廓线探测能力,本文自主研发了基于平流层高空气球平台的下投探空系统,并在青藏高原开展探测评估实验.该系统主要由下投探空舱,携带降落伞的下投探空仪,下投施放装置,数据接收通讯天线和GPS模块等组成.下投探空仪测量数据通过卫星通信链路和无线电信号实时发送至数据接收机存储处理.2020年青藏高原实验中8枚下投探空仪全部成功施放,提供了合理有效的大气廓线探测数据.后续会进一步提高下投探空仪传感器性能,全面评估其探测准确性和精度.  相似文献   

越南红河流域沉积物的镜下碳屑分析实验室处理方法对比研究   总被引：2，自引：1，他引：1       下载免费PDF全文

陆岸青  李珍  李杰  Xuan Phong Dang  Eiji Matsumoto 《第四纪研究》2009,29(4):825-830

本文设计4个不同的实验方法,以越南红河流域原始森林区、河漫滩区和水下三角洲区3个不同沉积环境下的9个样品为实验对象,对镜下碳屑不同的实验室处理方法进行对比研究,实验发现样品用六偏磷酸钠分散法(方法A)和盐酸分散法(方法B)处理后,镜下碳屑形态不易分辨,杂质多,而用氢氟酸处理法(方法C)和附加醋酸酐混合液处理法(方法D),镜下碳屑的形态清晰,杂质少,碳屑数量容易统计,但是方法D中利用醋酸酐与浓硫酸混合液去纤维素与染色过程会使纤维素碳化,结果显示碳屑浓度明显比用前3种方法处理的浓度高。以上实验结果表明方法C是最优的。另外,本研究在进行碳屑统计时,利用NIS­Elements Br 3.0软件的自动统计计数功能,不仅可以减小人为计数产生的误差,还可以实现碳屑的多参数统计,有利于古环境、古气候、古植被变化的多信息解译。  相似文献   

VEGETATION MAPPING USING REMOTE SENSING AND GIS     

Wu Bingfang  huang Xuan  Tian Zhigang 《地理学报(英文版)》1994,(Z2)

I.StduyAreaPUschRjdgeoftheSantaCatalinaMountains,CoronadONaionalForest,SoutheastArizona,wasselectedasastudyareafOrvegetationmopingandatestoftheroleOfGISinaidingrem0teIysenseddataclassificati0n.BeinganepitOmeoftheSantaCatalinaMountains,PUscllmdgeiscomprisedOf23O.65sqUarelQnoflandIocatedonthesouthwesternPOrti0noftheSantaCarelinaRangerDistrictOftheCoronadoNationalForest.ltprovidesasharPcontrastbebeenthenamralruggdnessOftheSantaCatalinaMountainsandtheCityOfTucson,Arizona,araPdl…  相似文献   

The Role of Ozone Depletion in the Lack of Cooling in the Antarctic Upper Stratosphere during Austral Winter     

Xuan MA  Lei WANG 《大气科学进展》2023,40(4):619-633

Temperature trends in the upper stratosphere are investigated using satellite measurements from Stratospheric Sounding Unit(SSU) outputs and simulations from chemistry–climate models(CCMs) and the Coupled Model Intercomparison Project Phase 6(CMIP6). Observational evidence shows a lack of cooling in the Antarctic, in contrast to strong cooling at other latitudes, during austral winter over 1979–97. Analysis of CCM simulations for a longer period of1961–97 also shows a significant contrast in the...  相似文献   

Geochemistry, Petrology and Mineralogy of Coal Measure Shales in the Middle Jurassic Yanan Formation from Northeastern Ordos Basin, China: Implications for Shale Gas Accumulation     

CHEN Qian  YAN Xiangbin  GUO Yuanling  HONG Taiyuan  NIE Haikuan  ZHANG Jinchuan  TANG Xuan  LI Wanjun  LIU Chong 《《地质学报》英文版》2018,92(6):2333-2350

The Jurassic Yanan Formation is one of the most important coal-producing formations and hydrocarbon source rocks in the Ordos Basin, North China. To evaluate the shale gas potential of the Yanan shale, a total of 48 samples from north Ordos Basin were sampled, and their geochemical, petrological, mineralogical and pore characteristics were investigated. It was found that the shale samples are a suite of early mature source rock. The total organic carbon (TOC) content ranges from 0.33% to 24.12% and the hydrogen index (HI) ranges from 43.31mg/g to 330.58 mg/g. The relationship between Tmax and HI indicates the organic matter is type Ⅱ-Ⅲ. This conclusion is also supported by the organic petrological examination results, which shows that the kerogen is mainly liptinite and vitrinite. Minerals in the samples are composed mainly of quartz, clay and feldspar, and the clay minerals are composed of prevailing kaolinite, illite/smectite, chlorite and a small amount of illite. Under scanning electron microscope, OM pores in the Yanan shale are scarce except pores come from the kerogen intrinsic texture or clay aggregates within the organic particles. As the weak compaction caused by shallow burial depth, interparticle pores and intraparticle pores are common, the hydrocarbon storage capacity of the Yanan shale was improved. According to evaluation, the Yanan shale is considered as a good shale gas reservoir, but its hydrocarbon potential is more dependent on biogenic and coal-derived gas as the thermogenic gas is limited by the lower thermal maturity.  相似文献   

Fluid Inclusion and Carbon-Oxygen Isotope Studies of the Hujiayu Cu Deposit, Zhongtiao Mountains, China: Implications for Syn-metamorphic Copper Remobilization     

QIU Zhengjie  FAN Hongrui  LIU Xuan  WEN Bojie  HU Fangfang  YANG Kuifeng  GUO Shuanglong  ZHAO Fengchun 《《地质学报》英文版》2015,89(3):726-745

The Hujiayu Cu deposit,representative of the "HuBi-type" Cu deposits in the Zhongtiao Mountains district in the southern edge of the North China Craton,is primarily hosted in graphitebearing schists and carbonate rocks.The ore minerals comprise mainly chalcopyrite,with minor sphalerite,siegenite[(Co,Ni)_3S_4],and clausthalite[Pb(S,Se)].The gangue minerals are mainly quartz and dolomite,with minor albite.Four fluid inclusion types were recognized in the chalcopyrite-pyrite-dolomite-quartz veins,including CO_2-rich inclusions(type Ⅰ),low-salinity,liquid-dominated,biphase aqueous inclusions(type Ⅱ),solid-bearing aqueous inclusions(type Ⅲ),and solid-bearing aqueous-carbonic inclusions(type Ⅳ).Type I inclusion can be further divided into two sub-types,i.e.,monophase CO_2 inclusions(type Ⅰa) and biphase CO_2-rich inclusions(with a visible aqueous phase),and type Ⅲ inclusion is divided into a subtype with a halite daughter mineral(type Ⅲa) and a subtype with multiple solids(type Ⅲb).Various fluid inclusion assemblages(FIAs) were identified through petrographic observations,and were classified into four groups.The group-1 FIA,consisting of monophase CO_2 inclusions(type Ⅰa),homogenized into the liquid phase in a large range of temperatures from-1 to 28℃,suggesting post-entrapment modification.The group-2 FIA consists of type Ⅰb,Ⅲb and Ⅳ inclusions,and is interpreted to reflect fluid immiscibility.The group-3 FIA comprises type Ⅱ and Ⅲa inclusions,and the group-4FIA consists of type Ⅱ inclusions with consistent phase ratios.The group-1 and group-2 FIAs are interpreted to be entrapped during mineralization,whereas group-3 and group-4 FIAs probably represent the post-mineralization fluids.The solid CO_2 melting temperatures range from-60.6 to56.6℃ and from-66.0 to-63.4℃ for type Ⅰa and type Ⅳ inclusions,respectively.The homogenization temperatures for type Ⅱ inclusions range from 132 to 170℃ for group-3 FIAs and115 to 219℃ for group-4 FIAs.The halite melting temperatures range from 530 to 562℃ for typeⅢ b and Ⅳ inclusions,whereas those for type Ⅲa inclusions range from 198 to 398℃.Laser Raman and SEM-EDS results show that the gas species in fluid inclusions are mainly CO_2 with minor CH_4,and the solids are dominated by calcite and halite.The calcite in the hosting marble and dolomite in the hydrothermal veins have δ~(13)C_(V-pdb) values of-0.2 to 1.2‰ and-1.2 to-6.3‰,and δ~(18)O_(v-smow) values of 14.0 to 20.8 ‰ and 13.2 to 14.3‰,respectively.The fluid inclusion and carbon-oxygen isotope data suggest that the ore-forming fluids were probably derived from metamorphic fluids,which had reacted with organic matter in sedimentary rocks or graphite and undergone phase separation at 1.4-1.8 kbar and 230-240℃,after peak metamorphism.It is proposed that the Hujiayu Cu deposit consists of two mineralization stages.The early stage mineralization,characterized by disseminated and veinlet copper sulfides,probably took place in an environment similar to sediment-hosted stratiform copper mineralization.Ore minerals formed in this precursor mineralization stage were remobilized and enriched in the late metamorphic hydrothermal stage,leading to the formation of thick quartz-dolomite-sulfides veins.  相似文献   

Trace Element and Sulfur Isotope Compositions of Gold-bearing Pyrite from the Zhangjiawa Iron Skarn Deposit,Laiwu District: Implications for Sources of Early Cretaceous Gold Mineralization in the North China Craton     

DUAN Zhuang  FU Yangang  LI Chunji  ZHAO Shaorui  GAO Mingbo  GAO Jilei  JIN Lijie  LI Siyuan  NGO Dac Xuan 《《地质学报》英文版》2021,95(5):1771-1774

  相似文献   

Early Evolution of Marine Planktonic and Nektonic Ecosystems:Questions and Chinese Approaches     

ZHANG Yuandong  ZHANG Junpeng  YAN Kui  FANG Xiang  LI Wenjie  MA Xuan  WU Xuejin 《《地质学报》英文版》2019,93(Z1):169-172

正The originations of marine planktons and nektons are significantly delayed than that of benthos,as evidenced by the fossil record.The Cambrian Explosion produced a variety of high-level marine organisms,and many remarkablebody-plans.However,a majority of these organisms are benthic or level-bottomed,and are rather dependent on the substrates of sea floors.This conclusion holds even with the giant predator  相似文献   

南海表层沉积沟鞭藻孢囊的分布特征   总被引：4，自引：0，他引：4  

吴国Xuan  孙湘君 《热带海洋》2000,19(1):8-16,T001

为研究沟鞭藻孢囊含量和组合的分布规律,分析了南少上位的表层沉积样品。共鉴定得沟鞭藻孢囊１６属２７种,孢囊含量变化在８至９２５粒．ｇ＾－１之间。研究区北部及靠近巴士海峡的样品孢囊含量较高,而南海南部的样品孢囊含量较低。孢囊含量的这一分布型式与南海表层水中浮游植物的分布特征具有一致性,似受表层海水营养因素控制。Ｓｐｉｎｉｆｅｒｉｔｅｓ是沟鞭藻孢囊组合的优势组分,主要有Ｓ．ｒａｍｏｓｕｓ,Ｓ．ｈｙｐｅｒ  相似文献   

Comparison between ozonesonde measurements and satellite retrievals over Beijing,China          下载免费PDF全文

Jinqiang Zhang  Yuejian Xuan  Jianchun Bian  Holger V?mel  Yunshu Zeng  Zhixuan Bai  Dan Li  Hongbin Chen 《大气和海洋科学快报》2024,(1):16-22

从2013年开始,作者团队使用自主研发电化学原理臭氧探空仪在华北平原北京地区进行每周一次观测.本研究首次使用2013-2019年期间北京地区臭氧探空数据评估Aqua卫星搭载大气红外探测仪(AIRS)和Aura卫星搭载微波临边探测器(MLS)反演垂直臭氧廓线,并对比臭氧探空,AIRS和Aura卫星搭载臭氧监测仪(OMI)臭氧柱总量结果.尽管臭氧探空与卫星反演垂直臭氧廓线在局部高度处差异较大,但整体来说两者较为接近(相对偏差大多<10%).臭氧探空,AIRS和OMI三种仪器测量臭氧柱总量的年变化特征较为一致,其年均臭氧柱总量分别为351.8±18.4 DU,348.8±19.5 DU和336.9±14.2 DU.后续对国内多站点观测数据分析将有助于进一步理解臭氧探空与卫星反演臭氧资料在不同区域的一致性.  相似文献