对流层污染测量仪(MOPITT)原理及其应用     

马立杰  黄海军  龚建明  崔迎春  张志珣 《海洋科学》2006,30(2):81-84

1对流层污染测量仪（MOPITT）概况 MOPITT（the Measurement of Pollution in the Troposphere）测量仪搭载在美国地球观测计划（EOS）Terra卫星上,该卫星于1999年12月18日成功发射。Terra卫星采用高度为705km,太阳同步轨道,地方时上午10：30通过赤道,3d对整个地球观测一遍。根据气体相关放射性测量学原理,MOPITT测量对流层的CO浓度（体积混合率）和总柱CO和CH6含量（卫星与地球之间一个大气柱里单位面积分子总数）。  相似文献   

沙漠地质记录和人类活动遗迹数据汇交规范化     

赵雪迷  张峰  李鸿威  孙涛  王晓云  崔博超  郑江华 《中国沙漠》2021,41(1):93-100

数据汇交是实现数据共享的前提,是实现科学数据的持续累积、科学整合和有效管理可持续发展的重要基础.分析了沙漠地质记录和人类活动遗迹数据汇交规范化存在的问题,强调了制定沙漠地质记录和人类活动遗迹数据汇交规范的必要性,根据沙漠地质记录和人类活动遗迹资料的数据特性,对数据分类并建立不同专题数据库,因地制宜采纳国际和国内现行的规...  相似文献   

城市青年群体住房产权获得的区域差异——以上海和南京为例     

崔璨  李佳怡  崔军茹  徐伟  王丰龙 《热带地理》2020,40(6):1004-1014

从城市异质性视角,以一线城市上海和二线城市南京为例,基于2013年长三角地区社会变迁调查和南京市住房调查数据,利用Logistic模型,剖析了两地青年住房产权获得的影响因素及其差异。研究发现,两个城市青年住房产权获得的影响因素存在较大差异。与南京相比,上海青年居民的住房获得存在更大的区位和制度壁垒,受城市区位、户口、制度因素影响更大,而受教育水平、工作流动性等市场因素以及年龄、是否育有子女等生命历程因素的影响较小。上海,作为一线城市,户口制度仍然处于精准严控阶段,落户门槛相对较高,另外住房价格高企,上海的青年群体在住房产权获得中同时面临着制度层面和市场层面的双重严苛考验。而在二线城市南京,户口政策相对较为宽松,青年群体的住房产权获得所面临的制度性障碍较小,而市场因素更加主导。  相似文献   

Comparison of the Ability of ARIMA,WNN and SVM Models for Drought Forecasting in the Sanjiang Plain,China     

Zhang  Yuhu  Yang  Huirong  Cui  Hengjian  Chen  Qiuhua 《Natural Resources Research》2020,29(2):1447-1464

Natural Resources Research - Drought is a natural disaster that profoundly impacts all parts of the environment. Drought forecasting could provide technical support for drought risk prevention....  相似文献   

Mechanism of interaction between urbanization and resource environment in Central Asia     

Zhang  Xinhuan  Xu  Wenqiang  Xiang  Xinyi  Zhang  Zhiping  Cui  Mingjie 《地理学报(英文版)》2020,30(11):1723-1738

Journal of Geographical Sciences - Central Asia features an arid and semi-arid climate, and the region is undergoing urbanization in the context of a fragile eco-environment. The influence of...  相似文献   

孔石莼净化高盐废水海藻叶表微生态分析     

卢文娟  吕剑  武君  张宇轩  崔德杰 《盐湖研究》2020,28(1)

孔石莼是一种大型潮间带绿藻,在去除氮磷营养盐方面已发挥显著作用,但目前尚不清楚其在净化高盐废水时的叶表微生态情况。本研究利用孔石莼处理高盐废水,通过高通量测序技术分析了孔石莼表面和废水中的微生物群落分布特征。研究结果表明：孔石莼表面的微生物多样性和微生物丰度均高于废水。孔石莼叶表优势菌属包括芽孢杆菌属Bacillus、微小杆菌属Exiguobacterium、虚构芽孢杆菌属Fictibacillus和短芽孢杆菌属Brevibacillus,其中芽孢杆菌属Bacillus最为丰富,占比超过整体的70%。废水中微生物以芽孢杆菌属Bacillus与微小杆菌属Exiguobacterium为主,二者占比总和超过整体的99%。相较于水体的流动性,孔石莼表面更利于微生物的生长与分布。  相似文献   

Interdecadal oscillations in the Japan Sea proper water related to the arctic oscillation     

Yanlin Cui  Tomoharu Senjyu 《Journal of Oceanography》2010,66(3):337-348

The time series of dissolved oxygen (DO) concentration in the Japan Sea Proper Water (JSPW) shows clear interdecadal oscillation with about 20-year periodicity since the 1970s. This interdecadal variation in the DO concentration is positively correlated with the Arctic Oscillation (AO) index; the DO concentration tends to be high during a positive AO phase when the East Asian winter monsoon (EAWM) is relatively weak, which is considered to be an unfavorable condition for the JSPW formation. To clarify the discrepancy, the cause of the interdecadal oscillation was investigated using the wind at Wajima and sea surface temperature (SST) in the JSPW formation area. The cold-air outbreaks determined from the wind at Wajima are synchronized with the interdecadal oscillation of the AO; during a positive AO phase the cold-air outbreaks over the Japan Sea are more active, as reported by Isobe and Beardsley (2007). Since the SST in the JSPW formation area is negatively correlated with cold-air outbreaks, the activity of cold-air outbreaks is more important to the JSPW formation than the EAWM, at least on an interdecadal timescale. Significant correlations of the indicator of low pressure migration with the AO and cold-air outbreaks confirm that atmospheric disturbances move frequently into the Japan Sea from the East China Sea in a positive AO phase. A detailed examination of cold-air outbreaks revealed that the passing of atmospheric low pressures temporarily enhances the east-west pressure gradient over the Japan Sea and effectively brings cold air into the JSPW formation area.  相似文献   

应用FMI成像测井识别钙质结核及意义     

崔维平  杨玉卿 《海洋地质译丛》2010,(4):99-102

结核属于一种矿物集合体,对于查明所赋存沉积物的沉积环境、沉积特征及演化历史等方面有重要意义,以往对于露头中出现的结核研究较为成熟。而对于井下发育的结核,缺乏有效手段对其形态、形成阶段及数量进行全面认识,致使结核理论在地质分析应用中受到极大限制。充分利用FMI成像测井纵、横向分辨率高、井眼覆盖率高、图像清晰等特点,对珠江口盆地琼海凸起珠江组大量发育的钙质结核形态及形成阶段做了详细研究,为认识研究区沉积环境及演化规律起到积极意义,同时也证明FMI成像测井资料为识别井下地层中发育的结核提供了一种有效手段。  相似文献   

κ-卡拉胶固相酸降解及其寡糖结构分析     

郝翠  于广利  赵峡  杨波  李广生  郇培  郝杰杰  曾洋洋 《中国海洋大学学报(自然科学版)》2010,40(5)

以κ-卡拉胶为原料,采用正交实验法建立了1种固相酸降解制备κ-卡拉胶寡糖方法。结果表明,当阳离子交换树脂(732#)用量为100 mg/mL、κ-卡拉胶的质量浓度为3%时,在60℃下降解3 h后,寡糖分布宽度较窄,经PAGE和电喷雾离子化质谱(ESI-MS)分析,表明所得寡糖为聚合度小于25的系列奇数寡糖。  相似文献   

Study on the dimethylsulfide and dimethylsulfoni-opropionate in algae by laboratory batch cultures     

张曼平  崔贞  崔伟  王芳  张慧珍  盛平 《中国海洋湖沼学报》1999,17(4):366-370

INTRODUCTIONDimethylsulfide(DMS)anditsprecursordimethylsulfoniopropionate(DMSP)areofbiogenicorigin .DMSandDMSPconcentrationsshownoclearcorrelationwithplanktonbiomassorproductivityinsomesearegions.ThismaybeduetothefactthatfactorslikephytoplanktonspeciationandphysiologicalstatearemoreimportantthanalgalbiomassorproductivityincontrollingDMSlevelsinseawater (Barnardetal.,1 984 ) .TurnerandMalin (1 988)andAndreae (1 990 )suggestedthattheunderlyingreasonfortherelativelyhighabundancesofDM…  相似文献