Interannual sea level variability in the South China Sea and its response to ENSO   总被引：18，自引：0，他引：18  

Zengrui Rong  Yuguang Liu  Haibo Zong  Yongcun Cheng   《Global and Planetary Change》2007,55(4):257-272

Sea level observed by altimeter during the 1993–2004 period, thermosteric sea level from 1945 through 2004, and tide gauge records are analyzed to investigate the interannual variability of sea level in the South China Sea (SCS) and its relationship with ENSO (El Niño and Southern Oscillation). Both the interannual variations of the observed sea level and the thermosteric sea level are closely related to ENSO. An ‘enigma’ that the SST and sea level in the SCS have inverse response to ENSO is revealed. It is found that the thermosteric sea level has an excellent correspondence to seawater temperature at 100 m depth, and their variations are unsynchronized to SST. Detailed analysis denotes that the warming of seawater occurs only in the upper 75 m during and after the mature phase of El Niño, while the cooling appears in the layers deeper than 75 m during El Niño years. The volume transports between the SCS and the adjacent oceans and the anomalous Ekman pumping contribute a lot for the sea level fall in the developing stage of El Niño, while the mass exchange, which is dominated by precipitation, plays a more significant role in the following continuous negative sea level anomalies.  相似文献   

Disk Thicknesses and Some Parameters of 108 Non-Edge-On Spiral Galaxies     

Tao Hu Qiu-He Peng Hong-Shi Zong 《中国天文和天体物理学报》2007,7(4):579-589

We present disk thicknesses, some other parameters and their statistics of 108 non-edge-on spiral galaxies. The method for determining the disk thickness is based on solving Poisson's equation for a disturbance of matter density in three-dimensional spiral galaxies. From the spiral arms found we could obtain the pitch angles, the inclination of the galactic disk, and the position of the innermost point (the forbidden region with radius r 0 to the galactic center) of the spiral arm, and finally the thickness.  相似文献   

甘肃北山—河西走廊—祁连山区域地下水循环模式     

董艳辉  符韵梅  王礼恒  王驹  张倩  宗自华  周志超 《地质科技情报》2022,41(1):79-89

山区地下水流动受到区域气候条件、地形地貌、地质构造等因素共同控制,限于资料有限,其流动模式与控制机理尚不清晰.特别是地处甘肃北山的高放废物地质处置库预选区、河西走廊以及祁连山北麓区域地下水的流动模式,直接决定了处置库在万年时间尺度上的安全性.基于区域遥感构造解译、地质构造演化分析、地球物理勘探以及水文地质钻探,获取了典...  相似文献   

Precise and Accurate In Situ Determination of Lead Isotope Ratios in NIST,USGS, MPI‐DING and CGSG Glass Reference Materials using Femtosecond Laser Ablation MC‐ICP‐MS     

Chen Kaiyun  Yuan Honglin  Bao Zhian  Zong Chunlei  Dai Mengning 《Geostandards and Geoanalytical Research》2014,38(1):5-21

Lead isotope ratio data were obtained with good precision and accuracy using a 266 nm femtosecond laser ablation (fLA) system connected to a multi‐collector ICP‐MS (MC‐ICP‐MS) and through careful control of analytical procedures. The mass fractionation coefficient induced by 266 nm femtosecond laser ablation was approximately 28% lower than that by 193 nm excimer laser ablation (eLA) with helium carrier gas. The exponential law correction method for Tl normalisation with optimum adjusted Tl ratio was utilised to obtain Pb isotopic data with good precision and accuracy. The Pb isotopic ratios of the glass reference materials NIST SRM 610, 612, 614; USGS BHVO‐2G, BCR‐2G, GSD‐1G, BIR‐1G; and MPI‐DING GOR132‐G, KL2‐G, T1‐G, StHs60/80‐G, ATHO‐G and ML3B‐G were determined using fLA‐MC‐ICP‐MS. The measured Pb isotopic ratios were in good agreement with the reference or published values within 2s measurement uncertainties. We also present the first high‐precision Pb isotopic data for GSE‐1G, GSC‐1G, GSA‐1G and CGSG‐1, CGSG‐2, CGSG‐4 and CGSG‐5 glass reference materials obtained using the femtosecond laser ablation MC‐ICP‐MS analysis technique.  相似文献   

Correlated observations and simulations on the buildup of radiation belt electron fluxes driven by substorm injections and chorus waves     

Zhaoguo He  Hui Zhu  Siqing Liu  Qiugang Zong  Yongfu Wang  Ruilin Lin  Liqin Shi  Jiancun Gong 《Astrophysics and Space Science》2015,355(2):245-251

  相似文献   

河南省境内淮河南北气候变化的小麦适应度比较   总被引：3，自引：0，他引：3  

苏坤慧  延军平  白晶  张立伟  王晓喆  李建山  田青霞 《地理科学进展》2012,31(1):63-71

适应度是气候变化下适应性研究的关键环节,本文提出气候变化适应度的概念及其定量评价方法,并对淮河南北的小麦适应度进行比较分析。结果表明,目前河南省境内的南北气候分界线并非淮河干流区,而是由原位置北移约300 km处的最大支流地带,冬小麦的适应度空间变化大致围绕该分界线呈经向分布。淮河分界线以南地域适应度为62.57%,高于以北地域的56.81%,研究结果表明,欲达到河南农业可持续发展,距离完全适应仍有较大空间需要人为调控,且北部相比较南部其调控压力更大。在年际变化上,随着20世纪80年代气候的突变,各地小麦温度适应度骤增,水分适应度骤减,之后随着气候的日趋稳定,各气候要素的适应度不断上升,但在21世纪初上升速度下降,甚至有降低趋势,表明气候变暖的环境对小麦的负面影响日渐突出。  相似文献   

县级气象台站做好文化建设的思考     

付彦兵  宗锋 《山东气象》2010,30(2):60-61,63

作为基层气象部门,文化建设对于一个单位强化内部管理、谋划科学发展,重塑价值体系具有重要意义。为此对基层气象台站文化建设情况开展了问卷调查,分析了基层台站气象文化建设的现状。在此基础上,探讨了气象文化的重要作用、气象文化建设的阻碍因素和气象文化建设的措施。  相似文献   

珠江水系沉积物重金属元素背景值估算及污染特征分析     

韦彬  侯青叶  唐志敏  宗庆霞  闫帅  何海云 《现代地质》2019,33(2):293-304

估算水系沉积物的地球化学背景值和识别其异常对人为污染判别与环境风险评估非常重要。采集并分析了珠江58件水系沉积物样品,经分析检验,Al、Fe和Sc被选作参考元素,并对比了确定地球化学背景及识别异常值的方法。其中,基于最小截断二乘法的回归分析是定义地球化学背景的有效方法,它是一种对异常值不敏感的稳健统计方法,而基于局部富集因子的箱线图和回归诊断图更适用于识别异常值。珠江不同河段重金属污染存在差异,北江和河网区主要受As、Cd、Cu、Pb和Zn污染,东江主要受Cu、Cr和Ni污染,而西江几乎不存在重金属污染。水系沉积物的主要污染类型是点源污染,主要污染来源是采矿和电镀等相关的工业活动。  相似文献   

珠江三角洲平原区土壤Pb元素地球化学特征及其影响因素研究     

郭思雨  侯青叶  宗庆霞  唐志敏  韦彬  庞世琦 《现代地质》2019,33(3):514-524

以珠江三角洲平原为研究区域,对其7个区县102件水稻根系土样品进行土壤理化参数及Pb形态分析,探讨在第四系分布区土壤Pb全量及Pb活动态含量的特征及影响因素。结果表明:全部供试土壤样品中Pb元素平均含量为46.47mg/kg,略高于广东省土壤Pb含量背景值(36mg/kg),表现出一定的累积趋势。研究区自西北陆相沉积区至南部海陆交互相沉积区,元素含量增高。Pb元素主要以残渣态和铁锰氧化物形态赋存在土壤中,迁移能力弱。影响土壤Pb全量的因素主要有Al2O3、K2O、Tl、Mo;影响土壤Pb活动态的因素有Pb全量、pH、有机质、CEC、P、TFe2O3、Mn;其中,p H是控制Pb元素活动性的最主要因素。  相似文献   

负压对四肢瘢痕切除创面成纤维细胞的生长环境影响     

袁宗  侯宏义  王耘川  胡大海 《寒旱区科学》2017,9(5):60-62,131

目的 探究持续封闭负压引流技术（VSD）对瘢痕切除创面成纤维细胞生长环境的影响。方法 回顾性分析2014年1月~2015年11月于笔者医院行植皮手术的四肢瘢痕切除术后患者60例,根据植皮手术前是否接受VSD治疗分为负压组（n=30）和包扎组（n=30）,负压组均于一期植皮前接受VSD治疗,包扎组未接受VSD治疗。回顾性分析对比两组患者并发症发生率、首次植皮存活率、创面感染率、住院时间之间的差异。并用TUNEL染色、CD34染色法对比瘢痕标本中成纤维细胞凋亡指数及血管生成情况。结果 负压组菌培养阳性率明显低于包扎组（P<0.05）,植皮存活率明显高于包扎组（P<0.05）。两组并发症发生率、住院时间、疼痛评分、随访VSS评分间比较,负压组均明显较低（P<0.05）。负压组成纤维细胞凋亡指数明显较低,微血管计数明显较高（P<0.05）。结论 负压封闭引流可以减轻瘢痕切除创面感染率,有效减轻炎性水肿,且可以通过改变局部血液循环微环境以及机械应力作用促进成纤维细胞增殖分裂,提高创面恢复效果。  相似文献