玉龙雪山冰川稳定同位素分馏冬夏对比   总被引：8，自引：0，他引：8  

庞洪喜  何元庆  卢爱刚  赵井东  宁宝英  院玲玲  宋波  张宁宁 《地理学报》2006,61(5):501-509

利用玉龙雪山白水1号冰川区冬季和夏季表面积雪、雪坑、融水以及白水河河水中δ¹⁸O资料,对比分析了冬季和夏季我国典型季风温冰川系统内稳定同位素分馏行为的差异。分析结果表明,夏季冰川系统内各水体相变过程中稳定同位素分馏程度均比冬季强烈,指示出夏季季风海洋型冰川强烈消融的特点。另外,不论是冬季还是夏季,从表面积雪到融水再到由融水补给的河流,δ¹⁸O垂直变化梯度依次增大,反映了从固态降雪向冰川融水补给的河流河水转换过程中,稳定同位素分馏程度逐渐增强,体现了沉积后过程对海洋型冰川区同位素记录的影响具有空间差异性。  相似文献   

海洋酸化和纳米银胁迫对海蜇幼蛰的生理影响          下载免费PDF全文

骆子怡  王雷  张月星  马元庆  陈立飞  董志军 《应用海洋学学报》2023,42(1):28-37

海洋酸化和纳米金属对海洋动物构成威胁,但海洋酸化和纳米金属胁迫对水母的影响却未曾报道。本研究以我国近岸大型食用水母海蜇（Rhopilema esculenta）为研究对象,研究海洋酸化和纳米银（AgNPs）胁迫对海蜇幼蛰的生理影响。将海蜇幼蛰暴露于两种水平的pH（8.10和7.60）和三种浓度的AgNPs（0、20和200 μg/L）持续14 d,测量其生长、运动行为以及生理指标。结果表明,海洋酸化能显著增强过氧化氢酶（CAT）和离子转运酶（Ca²⁺-ATPase、Na⁺K⁺-ATPase）活性,从而缓解AgNPs对幼蛰产生的氧化应激。AgNPs会抑制幼蛰的酸性磷酸酶（ACP）、碱性磷酸酶（AKP）和超氧化物歧化酶（SOD）活性,影响能量代谢,造成幼蛰生长速度减慢、收缩频率降低。随着AgNPs浓度的增加,海洋酸化导致幼蛰产生更高水平的脂质过氧化,丙二醛（MDA）含量显著增多。  相似文献   

Diverse transformations of sulfur in seabird-affected sediments revealed by microbial and stable isotope analyses     

Shen  Lili  Huang  Tao  Chen  Yuanqing  Chu  Zhuding  Xie  Zhouqing 《中国海洋湖沼学报》2023,41(1):138-149

Journal of Oceanology and Limnology - Microbial communities, sulfur isotope of sulfides (δ34SAVS and δ34SCRS), and sulfur and oxygen isotopes of sulfate ( $${\delta...  相似文献   

两次超强厄尔尼诺事件海温异常与次年中国东部夏季降水特征对比          下载免费PDF全文

罗婷  李丽平  王远清 《大气科学学报》2019,42(5):715-724

利用NOAA逐月海表温度(SST)资料,NCEP/NCAR风场、高度场和比湿再分析资料和国家信息中心提供的753站逐日降水资料,对比分析了1997/1998年和2015/2016年两次强厄尔尼诺事件的海温异常分布特征、次年中国东部夏季降水以及环流异常特征,结果表明:1)2015/2016的厄尔尼诺事件是自1950年以来持续时间最长,强度最强的一次事件,日界线附近的海温较1997/1998年的偏高。2)1997/1998年厄尔尼诺事件次年华南西部、江南北部到长江流域、黄淮北部到华北南部以及我国东北地区降水较常年偏多。而2015/2016年厄尔尼诺事件次年降水范围和强度相对较小,强雨带主要分布在长江流域一带、黄淮地区和华北一带及河套北部。3)1997/1998年事件次年夏季西北太平洋副热带高压强盛,位置偏西,脊线偏南,向上垂直质量输送异常偏强、高低层水平风场配合以及水汽通量异常辐合偏强均有利于长江流域一带以及我国东北地区降水产生,而2015/2016年事件次年的副高相对偏弱,且脊线位置偏北、偏东,水平、垂直异常环流和水汽偏弱,因此降水范围和程度较1997/1998年的偏弱。从海温分布型和次年对我国东部夏季降水造成的影响上看,2015/2016年的超强厄尔尼诺事件有别于传统东部型事件。  相似文献   

海啸在冲绳海槽和东海浅水大陆架地形上产生和传播的数值模拟   总被引：1，自引：0，他引：1  

李伟  朱元清  王本龙  宋治平 《地震地磁观测与研究》2007,28(5):138-142

运用数值模拟的方法对在冲绳海槽产生9.0级地震,并引发海啸的过程和海啸波在东海浅水大陆架地形上的传播过程进行研究.模拟的结果表明,数值模拟产生的波浪符合海啸波的特点,东海浅水大陆架适合海啸波的传播.  相似文献   

山东省招远市上庄矿区陈家矿段深部金矿床地质特征     

王兆忠  房静  张金勇  于进先  孙正元  李元庆 《山东国土资源》2009,25(12):21-25

“焦家式”金矿是胶西北地区重要的矿床类型。陈家矿段位于焦家成矿带的北段,矿化特征表现出与焦家成矿带诸多的相同特征。研究区共有3种赋矿岩性即绢英岩化碎裂岩、绢英岩化碎裂状二长花岗岩、绢英岩化碎裂状花岗闪长岩。在-500～-800m共圈定4个矿体,发现了新的金矿体,实现了深部找矿的目的。  相似文献   

The Features of Climate Variation and Glacier Response in Mt.Yulong,Southeastern Tibetan Plateau   总被引：2，自引：0，他引：2  

Xin Huijuan  He Yuanqing  Zhang Tao  Niu Hewen  Du Jiankuo 《地球科学进展》2013,28(11):1257-1268

The Features of climate change in Mt.Yulong, southeasten Tibetan Plateau were analyzed using linear regression, Mann Kendall abrupt test and Morlet wavelet analyses. In addition, the relationship between glacier retreating (Baishui Glacier No.1) and climate warming wasalso analyzed in this study. The main results are showedas follow: ① The annual mean temperature, precipitation have an increasing trend, withinclination rates being 0.15℃/10a and 9.0 mm/10a;annual temperaturedramatically ascend in 1998 with the change values 0.7 ℃; Morlet waveletsin annual temperature andtemperature in dry season mainly have a 10 to 15 year periods,while annual precipitation amount and the precipitation in rainy season presented a quasi 10 year periods. ②Prior to 1998, the important meteorological factor influencing the change of Baishui Glacier No.1 are temperature and precipitation, while in the following years, temperature plays a more important role in affecting its retreat and advance; The main characteristic ofvertical climate change in Mt. Yulong (1982/2009) is that the cold season shortens and temperature rises with elevation, and the maximal value of increased temperature in glacier zone is 2.2~2.5 ℃, resulting in greatly accelerated glacier ablation.  相似文献   

云南地区震前舒曼谐振异常初步分析   总被引：1，自引：0，他引：1  

苗园青  张学民  申旭辉  欧阳新艳 《中国地震研究》2013,27(1):101-108

There is a good correlation between anomalous Schumann resonance and seismic activities. Pre-earthquake anomalous Schumann resonance is an important manifestation of LAIC (Lithosphere-Atmosphere-Ionosphere Coupling), which is probably associated with seismic ionospheric disturbance. The observation system parameters of the Yunnan Schumann resonance monitoring stations and the results of statistical and seismic cases analysis are introduced in this paper. Three days before the March 10, 2011 MS5.8 Yingjiang earthquake, anomalous Schumann resonance in the By component (E-W) was observed by Yongsheng station, and two days before the Lincang MS4.0 earthquake of January 23, 2011, anomalous Schumann resonance in the By component was detected by the same station. Spectrum analysis results on the By component observations of Tonghai station show that strong disturbances were observed in spectral density corresponding to the first three Schumann resonant frequencies on the very day of the MS4.2 Honghe earthquake of May 22, 2011. Research shows that Schumann resonance monitoring is a feasible method for seismic-electromagnetic precursors monitoring.  相似文献   

Schumann resonance observation in China and anomalous disturbance possibly associated with Tohoku M9.0 earthquake     

Xinyang Ouyang  Xuemin Zhang  A. P. Nickolaenko  M. Hayakawa  Xuhui Shen  Yuanqing Miao 《地震科学（英文版）》2013,26(2):137-145

Schumann resonance (SR) is an electromagnetic resonance phenomenon in the Earth–ionosphere cavity exited by global lightning activities when the wavelength matches the circumference of the Earth, and the lowest four peak frequencies of SR are about 8, 14, 20, and 26 Hz. This article presents the new observational data of SR in China. The observations of two horizontal magnetic components (B _NS and B _EW) in the frequency band range of 3–29 Hz at Yongsheng observatory (26.7°N, 100.8°E) in southwestern China were mainly analyzed. It is found that the SR amplitudes at peak frequencies in B _NS and B _EW components all showed diurnal and seasonal variations, and that the SR amplitude in B _NS component is always higher than that in B _EW component. Diurnal variation of SR amplitude around equinoxes and solstices in B _NS component is related to active intervals of three global thunderstorm centers, while SR amplitude in B _EW component is the most significant at around 16 LT, corresponding to Asian center. SR amplitudes both in B _NS and B _EW components increase in the rainy season from May to September. In addition, the SR anomalies in association with the 2011 Japan earthquake are exhibited. The anomalous effect was characterized by an increase in amplitude at the lowest four SR modes beginning at 4 days before this earthquake. Upon analyzing the wave interference between the direct wave and disturbed wave scattered by localized modification of lower ionosphere over the epicenter, Asian and African thunderstorm centers are found to contribute to anomalous effect observed at Yongsheng station. Modeling results of SR regular and disturbed spectra at different local times led to the similar conclusion.  相似文献   

云南地区震前舒曼谐振异常初步分析     

苗园青  张学民  申旭辉  欧阳新艳 《中国地震》2011,27(3):290-299

舒曼谐振异常现象与地震活动性有较好的相关性,舒曼谐振异常现象可能与地震电离层扰动有关,是岩石层-大气层-电离层耦合的重要体现之一.本文详细介绍了云南舒曼谐振地震前兆观测台的系统结构和仪器参数,以及统计分析和震例分析的结果.永胜台观测数据显示2011年3月10日云南盈江M5.8级地震震前3天By分量出现舒曼异常,2011年1月23日临沧东部M4.0级地震震前2天By分量出现舒曼异常;通海台观测的By分量频谱分析结果显示,2011年5月22日红河州M4.2级地震当日前3阶谐振频率对应谱密度出现强烈扰动.研究表明,舒曼谐振地震前兆监测是一种可行的监测手段.  相似文献