我国西北地区气温变化与Nino3区SST的关系及其稳定性分析     

郭渠  江玉华  程炳岩  孙卫国  李瑞 《冰川冻土》2010,32(1):83-90

根据1956—2005年中国西北地区72个观测站的月平均气温资料,分析了气温的空间分布特征,利用相关分析、滑动t检验、小波分析和小波凝聚谱等方法,探讨了Nio3区SST与西北地区气温的关系及其稳定性.结果表明:一致性异常分布是西北地区气温变化的最主要空间模态,第一模态时间系数与Nio3区SST有着较好的相关关系.在典型的ENSO暖状态,西北地区气温偏高,在典型的ENSO冷状态则情况相反.西北地区气温和Nio3区SST关系的稳定性分析表明,气温和SST之间在1～5a变化周期上存着较好的相关关系,但这种相关关系并不稳定,存在着年代际变化:1956—1970年正相关较好,1992—2005年反相关较好,而在1971—1991年二者相关关系较差.  相似文献   

济宁岩群大量变质碎屑岩和碳质岩的发现及地层划分     

张成基  焦秀美  李世勇  李哲 《山东地质》2010,(7):1-3

在详细研究济宁市颜店铁矿区报告和以往资料的基础上,对济宁颜店铁矿部分钻孔济宁岩群的岩矿心进行了编录和系统取样工作,发现济宁岩群存在大量变碎屑岩和首次在钻孔中辨别出碳质岩,这对济宁岩群地层的研究和铁矿成矿作用的研究都提供了重要最新资料。对于铁矿的成因研究和原岩及沉积环境的恢复都有重大的意义。依据岩石组合特征和含矿性,济宁岩群自下而上可划分为翟村组、颜店组和洪福寺组。  相似文献   

鲁豫交界地区尾波Q_c值分析研究     

苏道磊  刘财  刘希强  周彦文  董晓娜 《山东地质》2010,(9):31-36

该文对濮阳台记录的21次地震进行了地震波衰减研究,讨论了地球介质品质因子随频率变化的关系;利用不同地震采用不同流逝时间的尾波品质因子测定方法,有效去除了由于不同地震或同一地震的地震散射波在纵向介质中穿透深度的不同而导致对品质因子测量结果的影响,从而有利于扑捉到品质因子的异常变化特征与地震孕育过程的关系。利用改进后的模型,对鲁豫交界地区尾波值进行了计算,得到了该地区品质因子随频率的变化关系和区域介质衰减的时间变化特征。  相似文献   

Erratum: Geochronology of Late Cenozoic volcanism in the area of Lake Van,Turkey: An example of developmental dynamics for magmatic processes [Doklady earth sciences, 433(2), pp. 1031–1037]     

Lebedev  V. A.  Sharkov  E. V.  Keskin  M.  Oyan  V. 《Doklady Earth Sciences》2010,435(1):1548-1554

An isotope-geochronological study has been performed to examine the products of Late Cenozoic collision volcanism on the northern coast of Lake Van, Turkey. We obtained 45 new K—Ar dates, based on which the principal time characteristics of volcanic activity in the region have been determined. Volcanic activity in the northern coast of Lake Van has lasted ∼15 myr; it has had an expressed discrete nature, when periods of intense volcanic activity alternated with long-lasting pose periods. Four stages of Neogene—Quaternary volcanism have been identified: Middle Miocene (15.0—13.5 Ma), Late Miocene (10—9 Ma), Pliocene (5.8—3.7 Ma), and Quaternary (1.0—0.4 Ma). The average duration of the stages was 1—2 myr; the stages were separated from each other with periods of inactivity of approximately equal lengths (∼3 myr). For each of the Pliocene and Quaternary stages, three additional phases of volcanism have been identified, which were separated from each other with short time intervals (a few hundred thousand years). The last burst of volcanic activity in the study area occurred ∼400 ka; similar to Quaternary volcanism in general, it was not characterized by a high intensity. An important result of the studies performed was to confirm the existence of a separate Middle Miocene stage of collision volcanism for the Caucasian—Anatolian Segment of the Alpine Fold Belt. New geochronological data generated presented in this paper indicate that Neogene—Quaternary volcanism in this portion of the belt started much earlier (∼15 Ma) than assumed by the majority of the previous researchers.  相似文献   

Cassini图像中受散射光影响的7颗土星近环内卫星的天体测量          下载免费PDF全文

王志强  刘梦琪  张庆丰  吴林朋  欧钊杰  李燕  李展 《天文学报》2023,64(6):69

卡西尼号探测器携带了光学成像科学子系统(ISS: Imaging Science Subsystem), 在2004--2017年间拍摄了一些土星内卫星的图像. 部分图像中土星内卫星非常靠近土星环, 观测对象受土星环散射光影响导致测量精度差, 甚至无法测量. 由此提出一种适用于这类图像的背景消除算法, 可对受土星光环散射光影响的土星内卫星进行测量. 归算了7颗近环内卫星(土卫十(Janus)、土卫十一(Epimetheus)、土卫十五(Atlas)、土卫十六(Prometheus)、土卫十七(Pandora)、土卫三十二(Methone)和土卫四十九(Anthe))的70张ISS图像, 并与不消除散射光的方法进行了比较. 结果显示, 该方法至少可以提高43%的精度. 和喷气推进实验室的土星卫星历表\lk SAT415相比, 测量得到的赤经和赤纬方向的残差均值分别为0.72km和2.26km, 标准差分别为10.99km和11.36km.  相似文献   

三种扇贝挥发性风味物质指纹图谱分析     

崔明仙  李妍  付睛睛  景福涛  陈希盼  张恩烁  李赞  徐晓辉  冯艳微  孙国华  李彬  王卫军  杨建敏 《海洋与湖沼》2022,53(3):743-758

为探究海湾扇贝(Argopecten irradians)、栉孔扇贝(Chlamys farreri)、虾夷扇贝(Patinopecten yessoensis)三种扇贝闭壳肌的挥发性风味物质差异,采用气相色谱-离子迁移谱(gas chromatography-ion mobility spectroscopy,GC-IMS)技术,对三种扇贝闭壳肌在新鲜(40℃)和加热(100℃)情况下进行挥发性成分分析。结果表明:在新鲜状态下,海湾扇贝(HWSB-F)、栉孔扇贝(ZKSB-F)、虾夷扇贝(XYSB-F)闭壳肌中,共定性出27种挥发性风味物质,其中醛类8种,醇类5种,酮类5种,酯类3种,以及醚类、苯类、酸类、烯类和噻唑等。在加热情况下,海湾扇贝(HWSB-C)、栉孔扇贝(ZKSB-C)、虾夷扇贝(XYSB-C)闭壳肌中共定性出52种挥发性风味物质,其中醛类20种,酯类5种,酮类7种,醇类8种,烯类4种,酸类2种,醚类2种,还包括吡嗪、胺类、苯类、含氧杂环等物质。对三种扇贝闭壳肌新鲜组和加热组指纹图谱进行分析,发现新鲜扇贝原有的挥发性风味物质加热后减少,且产生了新的其他种类的挥发性风味物质。扇贝闭壳肌加热组的挥发性风味物质种类较多,组成比较复杂,新鲜组的扇贝闭壳肌挥发性风味物质种类较少,组成简单。通过主成分分析,可在新鲜状态和加热状态下,有效区分三种扇贝闭壳肌组织。三种扇贝闭壳肌挥发性风味物质指纹图谱的建立,丰富了不同扇贝呈味物质的组成成分研究内容,证明GC-IMS技术可快速鉴别三种去壳扇贝闭壳肌的种类,为不同种扇贝闭壳肌以次充好提供检测依据。  相似文献   

Reclamation-oriented spatiotemporal evolution of coastal wetland along Bohai Rim,China     

Fan Wei  Mei Han  Guangxuan Han  Min Wang  Lixin Tian  Jiqian Zhu  Xianglun Kong 《海洋学报(英文版)》2022,41(9):192-204

Coastal wetlands are located in the ecotone of interaction between the land surface and sea, and anthropogenic activities extensively interfere with these wetlands through the reclamation of large tidal wetlands and destruction of the function of the ecosystems. In this study, we investigated the dynamic evolutionary characteristics of the Bohai Rim coastal area over the past 40 years using the Modified Normalized Difference Water Index, the fractal dimension, object-oriented classification, the land-use transfer trajectory, and regression analysis. Additionally, we quantified and monitored the evolution of reclamation and analyzed the correlation between reclamation and coastal wetlands based on 99 Landsat-2, -5, and -8 images (at 60 m and 30 m spatial resolution) over the period 1980–2019. The results are as follows. (1) The coastline of the Bohai Rim increased by 1 631.2 km from 1980 to 2019 with a zigzag variation. The artificial coastline increased by 2 946.1 km, whereas the natural coastline decreased by 90%. (2) The area of man-made wetlands increased by 3 736.9 km2, the area of construction land increased by 1 008.4 km2, and the natural wetland area decreased by 66%. The decrease of tidal flats is the main contributor to the decrease of natural wetland area (takes account for 91.1%). Coastal areas are affected by intense human disturbance, which was taken place across a large area of tidal flats and caused the landscape to fragment and be more heterogeneous. The coastal zone development activities were primarily concentrated in the southern Laizhou Bay, the Yellow River Delta, the Bohai Bay, the northern Liaodong Bay, and the Pulandian Bay. The solidified shorelines and increase in sea level have resulted in intertidal wetlands decreasing and impaired wetland ecology. (3) There is a good agreement between reclamation and the size of the coastal wetlands. Both land reclamation and the reduction in coastal wetland areas are significantly related to the population size, fishery output value, and urbanization rate. In summary, human activities, such as the construction of aquaculture ponds and salt pans, industrialization, and urbanization, are the primary forces that influence the environmental changes in the coastal region. This study is beneficial for establishing and improving the systems for the rational development and utilization of natural resources, and provides theoretical references for restoring wetland ecology and managing future reclamation activities in other coastal zone-related areas.  相似文献   

Hydrodynamic Response and Power Performance of A Heave and Pitch Buoy Wave Energy Converter Under Bimodal Ochi-Hubble Wave Spectrum     

HUANG Shu-ting  LIU Yan-jun  XUE Gang  XUE Yi-fan 《中国海洋工程》2022,36(1):28-37

In coastal sea areas with the bimodal Ochi-Hubble wave spectrum, such as parts of the China Sea and Indian Ocean,wave energy is the superposition of wind wave and swell. Traditional heaving buoy wave energy converters developed with narrowband wave spectrums suffer from big energy loss in these areas, leading to lower power absorption efficiency and higher generating costs. In contrast, multi-freedom buoy has different resonant frequencies and maximal power capture wave frequencies in different ...  相似文献   

红树植物拟海桑及其亲本的根际细菌群落特征分析     

叶锦成  陈毅青  高琳  周鲜娇  钟才荣  张颖  王芸 《热带海洋学报》2022,41(6):75-89

植物根际微生物群落能够从亲本传递给子代, 从而影响植物的表型。野外调查发现, 海桑属(Sonneratia)红树植物自然杂交杂种拟海桑在野外通常比亲本生长更为强壮, 表现出极强的生存优势。为探究这一现象的原因, 本研究从根际微生物角度出发, 利用细菌16S rRNA基因高通量测序技术, 对采自海南省东寨港的三种红树植物拟海桑(S. × gulngai)及其亲本海桑(S. caseolaris)和杯萼海桑(S. alba)的根际土壤进行根际细菌群落特征分析。结果表明, 三种红树植物根际细菌群落多样性高, 种类丰富, 分属于30门242科351属, 其中变形菌门(Proteobacteria)为最优势门, 在各个样本中丰度超过40%, 子代拟海桑继承亲本的根际微生物多数都属于这一类群。研究发现, 子代拟海桑与两亲本的根际细菌类群组成在门水平存在显著差异, 其中酸杆菌门(Acidobacteria)和放线菌门(Actinobacteria)在子代拟海桑中丰度分别为4.3%和6.5%, 显著高于亲本1%~2%的含量; 在亲本杯萼海桑中, 丰度高达19.8%的栖热菌门(Thermi)在子代中丰度仅有1%, 而热袍菌门(Thermotogae)(5%)甚至消失。总之, 子代拟海桑与亲本杯萼海桑的根际微生物群落组成相对于亲本海桑表现出更大的差异性。土壤理化性质分析发现, 子代拟海桑的土壤全氮(total nitrogen, TN)含量显著低于亲本, 含量相差3倍以上, 相关性分析表明, TN浓度与菌群中的浮霉菌门(Planctomycetes)、放线菌门(Actinobacteria)、酸杆菌门(Acidobacteria)丰度显著负相关。通过功能预测分析发现, 子代拟海桑微生物群落中与基础代谢相关的碳水化合物、氨基酸、能量以及脂质代谢相关的功能基因丰度显著都高于亲本, 表现出代谢能力的增强。本研究认为, 子代拟海桑对亲本的根际土壤微生物进行了选择性继承, 菌群组成更为合理, 在保持菌群高度多样性的同时, 一些根际促生菌的含量增加, 使菌群基础代谢能力增加, 更有利于子代拟海桑的生长。  相似文献   

山城眺望空间OSCA模型构建及应用   总被引：2，自引：0，他引：2  

王烁棋  赵亮 《地球信息科学学报》2021,23(9):1559-1574

山体是大自然赋予城市的天然景观资源,通过山与城市中建筑群构成的山城空间关系,可形成多类型的眺望景观。当前山城眺望景观在建设热潮中不断被破坏,逐渐消失在林立的高楼中,需要进行一定的控制和保护。以济南市中心城区为例,基于眺望控制分区,寻找城市建筑发展演变、分区建设的规律,结合元胞自动机与多智能体,提出基于眺望景观控制下的山城眺望空间CA-OSCA模型（Overlooking Space Cellular Automata）,构建山城眺望空间演变模型。利用GIS等数据分析平台,对模拟结果进行分析,构建真实城市空间下的未来山城眺望空间景观三维模型,以更加直观、真实地方法探讨在眺望景观分区控制的影响下,未来城市空间结构的发展模式,最终为未来山城眺望景观空间的控制与保护以及眺望景观保护下,山城城市未来空间发展结构提出发展策略。  相似文献