A coupled ice-ocean ecosystem model for 1-D and 3-D applications in the Bering and Chukchi Seas

Primary production in the Bering and Chukchi Seas is strongly influenced by the annual cycle of sea ice. Here pelagic and sea ice algal ecosystems coexist and interact with each other. Ecosystem modeling of sea ice associated phytoplankton blooms has been understudied compared to open water ecosystem model applications. This study introduces a general coupled ice-ocean ecosystem model with equations and parameters for 1-D and 3-D applications that is based on 1-D coupled ice-ocean ecosystem model development in the landfast ice in the Chukchi Sea and marginal ice zone of Bering Sea. The biological model includes both pelagic and sea ice algal habitats with 10 compartments： three phytoplankton （pelagic diatom, flagellates and ice algae： D, F, and Ai） , three zooplankton （copepods, large zooplankton, and microzooplankton ： ZS, ZL, ZP） , three nutrients （ nitrate ＋ nitrite, ammonium, silicon ： NO3 , NH4, Si） and detritus （Det）. The coupling of the biological models with physical ocean models is straightforward with just the addition of the advection and diffusion terms to the ecosystem model. The coupling with a multi-category sea ice model requires the same calculation of the sea ice ecosystem model in each ice thickness category and the redistribution between categories caused by both dynamic and thermodynamic forcing as in the physical model. Phytoplankton and ice algal self-shading effect is the sole feedback from the ecosystem model to the physical model.     

景德镇陶瓷作坊的文化生态景观研究

根据自然—经济—文化相互联系及物质与能量转换的关系,通过实地考察景德镇生态资源,考证现存的大型陶瓷作坊,分析相关的历史文献和考古资料,运用手工绘图、测量数据,从文化地理学的角度论证了陶瓷作坊应严格遵循自然规律,因地制宜、因材施艺、资源循环利用;建筑材料、结构功能、生产工序、工艺布局具有科学性、合理性、严谨性。指出景德镇陶瓷工匠创造了采光、通风、温度、湿度宜人的生产环境,陶瓷作坊达到了结构、功能、效率、风格的完美统一,堪称世界人与自然和谐相处的经典之作,揭示作坊景观形成机理。     

基于TPB拓展模型游艇旅游行为意向影响机制研究

在改进计划行为理论(TPB)模型基础上,引入人口特征和游艇文化变量,构建游艇旅游行为意向的影响机制模型,以实地调研和问卷调查作为数据来源,运用结构方程模型(SEM)实证检验影响旅游者参与游艇旅游行为意向的主要因素及其作用机制。研究表明:当前我国旅游者参与游艇旅游的意向较高;旅游者的行为态度、主观规范、感知行为控制和游艇文化是影响其选择游艇旅游活动的重要因素;旅游者的行为态度、游艇文化2个变量对游艇旅游行为意向具有显著的正向影响;主观规范和感知行为控制均通过行为态度这一中介变量间接影响游艇旅游行为意向。     

遥感技术在地质灾害调查及灾害规律研究中的应用——以辽宁省建昌县为例

地质灾害与地质环境条件、人类工程活动关系密切,严重威胁着人类生命财产安全,制约社会经济的可持续发展。运用遥感技术对辽宁省建昌县进行地质灾害调查,利用ENVI5.3软件对高分二号数据进行预处理,建立遥感解译标志并开展了野外验证,最终解译滑坡、崩塌、泥石流、地面塌陷等地质灾害点75个;同时,利用Arcgis10.4空间分析功能,对遥感解译地质灾害点与地貌、坡度、坡向、构造、水系及人类工程活动等因子进行叠加分析,基本查清了研究区地质灾害规模、空间分布特征和发育规律,为研究总结区域上地质灾规律及有效预防提供了详实可靠的基础资料。     

Archaeal community structure in sediments from a seamount in the Mariana Volcanic Arc

Seamounts are subsurface mountains in the ocean. Examination of the abundance and distribution of Archaea in seamount ecosystems may provide a better understanding of their ecological functions. Most studies of marine archaeal assemblages in seamount area have focused on hydrothermal vents or ferromanganese crusts. We investigated the archaeal communities from a seamount of the Mariana Volcanic Arc, in the tropical western Pacific Ocean by using high-throughput sequencing. Thaumarchaeota was dominant in the sediments of all sample stations. Community diversity and species richness were greatest at stations near the top of the seamount, and lowest at the deepest station. One sample station on the steep southeast slope that faced the Yap-Mariana trench had a unique composition of Archaea. In summary, depth has an important influence on archaeal community structure, and the geographic properties and sediment characteristics may explain the unique distribution patterns of Archaea in this seamount. This study provides a foundation for future research on Archaea in seamounts.     

2010年长江三角洲临安本底站PM2.5理化特征

2010年在代表长三角区域背景地区的浙江省临安区域大气本底站开展了对大气细粒子PM_2.5为期1年的地面观测,并对细粒子中水溶性离子和碳组分的季节变化特征进行了分析。临安2010年大气中PM_2.5质量浓度平均为 (58.2±50.8) μg·m－3,PM_2.5质量浓度季节变化明显。利用HYSPLIT4模式计算了2010年临安72 h后向轨迹,根据轨迹计算与聚类结果,结合地面观测的PM_2.5数据进行了分析。研究表明:临安地区因受到长江三角洲区域及偏北气流引起的污染传输影响,呈现出高细粒子水平特征。PM_2.5中总水溶性离子年平均质量浓度为 (28.5±17.7) μg·m－3,占PM_2.5质量浓度的47%。其中,气溶胶组分SO₄2-,NO₃-和NH₄+所占比例最大,共占总水溶性离子的69%。PM_2.5中有机碳和元素碳的年平均质量浓度分别为 (10.1±6.7) μg·m－3和 (2.4±1.8) μg·m－3。有机碳和元素碳质量浓度显著相关,表明有机碳和元素碳主要来自相同的排放源。     

坎苏剖面记录的西天山地区黄土磁学性质及其控制因素初探

西天山地区坎苏(KS)黄土剖面的岩石磁学研究结果表明,与黄土高原地区黄土基本一致,磁性矿物以亚铁磁性矿物为主,磁铁矿和磁赤铁矿占据重要地位,针铁矿也普遍存在于地层中.该剖面中磁性矿物的含量高,硬磁性矿物含量也高.磁性矿物磁晶粒度以假单畴和多畴(PSD/MD)为主,而S1S3的磁晶粒度较细,表现为粗单畴(SSD)的性质....     

某隔震结构动力特性的理论分析与脉动测试

本文针对国内最大单体隔震建筑建立了SAP2000三维分析模型,并进行了动力特性的理论分析;现场对实际建筑进行了平移振动、扭转振动、垂直振动和平面内弯曲4个方面的脉动测试。利用工程振动反演理论分析了该结构的固有频率、振型、阻尼等动力特性,将实测结构动力特性与理论分析结果进行比较,详细分析实测结果与理论结果差别的原因,并据此对理论模型进行修正,为今后类似结构的设计积累了资料。     

A type of new conserved quantity deduced from Mei symmetry for Appell equations in a holonomic system with unilateral constraints

A type of new conserved quantity deduced from Mei symmetry of Appell equations for a holonomic system with unilateral constraints is investigated. The expressions of new structural equation and new conserved quantity deduced from Mei symmetry of Appell equations for a holonomic system with unilateral constraints expressed by Appell functions are obtained. An example is given to illustrate the application of the results.     

西藏阿里札达盆地上新世-早更新世沉积相及其构造演化特征

札达盆地新近系上新统一第四系下更新统地层可划分为下更新统香孜组(Q_p1x)、新近系上新统古格群(N₂gg),其中后者又细分为上新统札达组(N₂2z)和上新统托林组(N₂1t),属地堑型湖盆沉积,主要发育冲洪积相、冰缘相、冰湖相、湖相及河流相。札达盆地的构造演化经历了早期裂陷(N₂1t)、持续裂陷(N₂2z)、湖盆外泻(Q_p1x)、稳定隆升(Q_p2f)和强烈快速隆升(Q_p3~Qh)等5个阶段。盆地南北两侧数条相向正断层的活动性控制着该区的沉积相展布格局:断层活动强烈时,湖盆水域扩大,湖水加深,主要发育深湖-半深湖沉积,断层活动减弱时,水体变浅或干涸,湖盆被充填,主要发育河流相、冲洪积沉积。第四纪以来,随着青藏高原的快速隆升,札达盆地周缘高山区冰川活动加剧,主要发育冰缘相和冰湖相。