山西地区近期垂直形变场分析   总被引：2，自引：0，他引：2  

王秀文  郭跃宏  范雪芳 《大地测量与地球动力学》2001,21(2):64-69

利用山西及太原地区最新的 5 0年尺度的形变资料 ,分析、研究了区域形变场及其时空演化特征 ,认为山西地堑系的垂直形变场反映出其周围山区及次级隆起主要表现为持续上升 ,盆地主要呈趋势下降的总体特征。太原地区的地面沉降主要是由超量开采地下水引起的 ,南部地区的沉降速率大于北部。地堑系内这种垂直形变场的态势 ,说明本区构造的垂直差异活动既有继承性、又有新生性的特点。  相似文献   

Implementations and tests of Godunov-type particle hydrodynamics   总被引：1，自引：0，他引：1  

S.-H. Cha †  A. P. Whitworth 《Monthly notices of the Royal Astronomical Society》2003,340(1):73-90

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海南清澜港不同栖息位置红树林软体动物的食物来源   总被引：1，自引：0，他引：1  

王瑁  高雪芹  丁弈朋  米雪芳  张琳婷 《湿地科学》2015,(2):171-176

利用稳定同位素技术,对海南清澜港4种不同栖息位置的红树林软体动物的食物来源进行研究,分别为栖息于红树植物枝干和树叶上的粗糙滨螺(Littorina scabra)、栖息于沉积物表面的红树拟蟹守螺(Cerithidea rhizophorarum)和小翼拟蟹守螺(Cerithidea microptera),以及栖息于沉积物底内的红树蚬(Geloina coaxans)。根据红树植物树皮、叶片、大型藻类、海草、水体颗粒有机物、土壤表层沉积物和软体动物肌肉的δ13C和δ15N值,利用IsoSource统计软件,结合δ13C、δ15N位置图,研究其食物来源。结果显示,实验所选取的6种食物源都不是粗糙滨螺的主要食物;红树拟蟹守螺和小翼拟蟹守螺的主要食物都为大型藻类,食物贡献率分别为44%~80%和80%;红树蚬主要取食沉积物表层凋落的红树植物碎屑,树皮和叶片的食物贡献率都为26%~50%。红树林软体动物能够根据栖息生境选择适合自己的食物,摄食行为与红树林区生境的多样性相统一。  相似文献   

Comparison of nominal and standardized catch per unit effort data in quantifying habitat suitability of skipjack tuna in the equatorial Pacific Ocean     

Cheng Zhou  Yuanyuan Hu  Jie Cao  Liuxiong Xu  Xuefang Wang  Rong Wan  Yu Xiao  Jiangfeng Zhu  Hao Tang 《海洋学报(英文版)》2022,41(3):1-2

In the western and central Pacific Ocean, upper strata waters exhibit highly dynamic oceanographic features under ENSO variability. This has been proved to be responsible for the dynamic change of both abundance and zonal distribution of skipjack tuna(Katsuwonus pelamis). Although causality has been suggested by researchers using physical–biological interaction models, cumulative evidence needs to be obtained and the tenability of assertion needs to be tested from an ecological habitat perspecti...  相似文献   

A regional climate change simulation over East Asia     

Dong-Kyou Lee  Dong-Hyun Cha  Chun-Sil Jin  Suk-Jin Choi 《Asia-Pacific Journal of Atmospheric Sciences》2013,49(5):655-664

In this study, regional climate changes for seventy years (1980–2049) over East Asia and the Korean Peninsula are investigated using the Special Reports on Emission Scenarios (SRES) B1 scenario via a high-resolution regional climate model, and the impact of global warming on extreme climate events over the study area is investigated. According to future climate predictions for East Asia, the annual mean surface air temperature increases by 1.8°C and precipitation decreases by 0.2 mm day^?1 (2030–2049). The maximum wind intensity of tropical cyclones increases in the high wind categories, and the intra-seasonal variation of tropical cyclone occurrence changes in the western North Pacific. The predicted increase in surface air temperature results from increased longwave radiations at the surface. The predicted decrease in precipitation is caused primarily by northward shift of the monsoon rain-band due to the intensified subtropical high. In the nested higher-resolution (20 km) simulation over the Korean Peninsula, annual mean surface air temperature increases by 1.5°C and annual mean precipitation decreases by 0.2 mm day^?1. Future surface air temperature over the Korean Peninsula increases in all seasons due to surface temperature warming, which leads to changes in the length of the four seasons. Future total precipitation over the Korean Peninsula is decreased, but the intensity and occurrence of heavy precipitation events increases. The regional climate changes information from this study can be used as a fruitful reference in climate change studies over East Asia and the Korean peninsula.  相似文献   

晋中市2000年3月27日大风天气过程分析   总被引：2，自引：0，他引：2  

郭继奋  张年成  王丽丽  查增萍 《山西气象》2002,(1):11-13

山西省晋中市2000年3月27日出现了8级以上的大风伴随强沙尘暴天气，我们认为这主要是由于西太平洋副热带高压边缘的西南急流与西西伯利亚平原直到新疆境内的高压脊前的偏北急流的发展，使得蒙古气旋异常东移南下，导致了该次大风天气的发生。  相似文献   

Correlation between X-ray and γ-ray for Fermi blazars     

Bijun Li  Haojing Zhang  Xiong Zhang  Dingrong Xiong  Wenguang Liu  YongJuan Cha  Jin Li 《Astrophysics and Space Science》2013,347(2):349-355

Using γ-ray band data detected by Fermi Large Area Telescope (LAT) and X-ray band data for 78 blazars, we find a medium correlation between X-ray flux and γ-ray flux in all states. A medium correlation is also found between X-ray (1 keV) mean spectral index α _x and γ-ray mean spectral index α _γ for BL Lacertae objects (BL Lacs), and there is no correlation for Flat Spectrum Radio Quasars (FSRQs). From these results, we suggest that the most likely radiation mechanism for the high energy gamma-rays would be synchrotron self-Compton (SSC), and that the gamma-ray emission mechanism may be somewhat different for BL Lacs and FSRQs.  相似文献   

Broad line and multi-wave luminosity relations in Fermi FSRQs     

D. R. Xiong  H. J. Zhang  X. Zhang  Y. G. Zheng  T. F. Yi  W. G. Liu  Y. J. Cha  B. J. Li 《Astrophysics and Space Science》2013,345(2):345-354

We study broad line and multi-wave luminosity relations for 80 flat-spectrum radio quasars (FSRQs) detected by Fermi LAT. Our results are as follows: for FSRQs, the correlations between logL _γ and logL _BLR, between logL _X and logL _BLR, between logL _O and logL _BLR, between logL _R and logL _BLR are significant; the correlation between logL _IR and logL _BLR (P=0.08) is not significant, but might be refereed as a “trend” of significant correlation. These results support a close link between jet formation and accretion disk, and the L _γ -L _BLR correlation suggests that the radiation mechanism of the γ-ray emission in FSRQs is likely to be inverse Compton scattering of seed photons from BLR or outflowing BLR.  相似文献   

水汞观测干扰分析     

张文男  范雪芳  杨静  黄春玲 《地震地磁观测与研究》2013,34(1)

以试验方法改变日常水汞观测中涉及的化学试剂用量,来分析水汞观测的干扰因素,实验数据表明:硫酸试剂是影响水汞观测结果稳定性的主要因素之一,试剂量与观测结果(汞含量)成正相关关系;而高锰酸钾、氯化亚锡试剂对观测结果几乎没有影响.  相似文献   

Genetic Mechanism of Dolomitization in Fengcheng Formation in the Wu‐Xia area of Junggar Basin,China     

ZHU Shif  ZHU Xiaomin  NIU Huapeng  HAN Xuefang  ZHANG Yueqian  YOU Xincai 《《地质学报》英文版》2012,86(2):449-461

The dolomitic rocks of the Fengcheng Formation are considered to be formed under special geologic conditions, and are significant hydrocarbon reservoir rocks in the Wu-Xia area in the Junggar Basin. Analyses of petrologic characteristics and stable isotope composition indicate that the dolomitizing host rock is volcanic and the dolomitizing fluids probably consists of brine from shore-shallow lakes with great evaporation and salinity in the Fengcheng Formation, which have formed under arid climatic conditions, as well as residual Mg-rich seawater from the underlying Jiamuhe Formation and Carboniferous. Dust tuff in the area has significant plagioclase content. Anorthite and labradorite hydrolysis by CO2 can be coupled with calcite precipitation. Late Mg-rich brine percolated and replaced calcite formed in the early time, which lead to precipitate dolostones with different occurrences, such as graniphyric, random bedded or lumpy. The diagenetic dolostones with different occurrences resulting from particular formation conditions occurred in different tectonic settings. The dolomitizing fluid has been driven by the thermal convection flow generated by volcanic eruptions. At the same time, the overthrusts of the Wu-Xia growth fault?have speeded up the flow of deep Mg-rich water upwards, and induced the water to quickly?penetrate and horizontally migrate in the strata. Fracture is the major and the most important reservoir space in dolomitic reservoir of the Fengcheng Formation. Fracture and fault plays a decisive role in controlling the formation of dolostone and the distribution of favorable reservoirs. The deliverability of oil and gas is determined by the development and match relations of dissolved pores and fractures to a certain degree.  相似文献