北半球夏季中高纬度大气阻塞对北极海冰变化的影响          下载免费PDF全文

肖贻青 黄斌刁一娜  罗德海 《极地研究》2015,27(4):364-378

利用NCEP/NCAR再分析逐日500 h Pa高度场资料,对北半球夏季中高纬度大气阻塞特征进行统计分析,发现大气阻塞活动频率高的地区主要集中在白令海峡区域、鄂霍次克海区域、欧亚大陆区域及格陵兰区域。而通过NSIDC提供的卫星观测资料发现近30年夏季海冰容易减少的区域正好对应阻塞活动北部的高纬度地区。分别通过对以上4个区域有阻塞发生相对没有阻塞发生时的500 h Pa位势高度场、地面温度场、850 h Pa经向瞬变热通量输送和平流输送等异常变化场进行对比分析,结果发现夏季中高纬度阻塞频率的增加对海冰的减少有显著影响,主要体现在阻塞的发生发展可通过增加高纬度地面温度、对极地的热量输送和暖平流输送来加快海冰的融化。这种阻塞引起的热力作用在鄂霍次克海和欧亚大陆区域效果更为显著。  相似文献   

Effects of land-use changes on organic carbon in bulk soil and associated physical fractions in China's Horqin Sandy Grassland     

YuQiang Li  YinPing Chen  ShaoKun Wang  WenDa Huang  JianPeng Zhang 《寒旱区科学》2015,7(1):0050-0058

The Horqin Sandy Grassland is one of the most seriously desertified areas in China's agro-pastoral ecotone due to its fragile ecology, combined with improper and unsustainable land management. We inves...  相似文献   

Large deformation failure analysis of the soil slope based on the material point method     

Peng Huang  Shun-li Li  Hu Guo  Zhi-ming Hao 《Computational Geosciences》2015,19(4):951-963

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Spatiotemporal variation of river temperature as a predictor of groundwater/surface-water interactions in an arid watershed in China   总被引：1，自引：1，他引：0  

Yingying Yao  Xiang Huang  Jie Liu  Chunmiao Zheng  Xiaobo He  Chuankun Liu 《Hydrogeology Journal》2015,23(5):999-1007

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The soil–water flow system beneath a cotton field in arid north-west China,serviced by mulched drip irrigation using brackish water     

Xianwen Li  Menggui Jin  Jinou Huang  Jingjing Yuan 《Hydrogeology Journal》2015,23(1):35-46

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Sedimentary and hydrological studies of the Holocene palaeofloods in the Shanxi-Shaanxi Gorge of the middle Yellow River,China     

Xiaogang Li  Chun Chang Huang  Jiangli Pang  Xiaochun Zha  Yugai Ma 《International Journal of Earth Sciences》2015,104(1):277-288

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A study of the kinematics of unusually H I‐rich galaxies     

M. den Heijer  G. I. G. Jzsa  J. Kerp  P. Serra  Th. van der Hulst  G. Kauffmann  J. Wang  F. Bigiel  J. Brinchmann  D. Carton  D. Cormier  M.‐L. Huang 《Astronomische Nachrichten》2015,336(3):284-311

We examine the H I kinematics of the “Bluedisk” ensemble of 48 galaxies selected from the Sloan Digital Sky Survey and observed in H I with the Westerbork Synthesis Radio Telescope. The sample consists of 25 galaxies with a high H I mass fraction and a comparatively large control sample comprising 23 galaxies of comparable stellar mass, stellar mass surface density, redshift, and inclination. By studying the H I velocity fields of these galaxies, we investigate whether there are signatures of ongoing gas accretion: i.e. global asymmetries and indications for warping and kinematical lopsidedness. We find no enhanced kinematical asymmetries between the H I‐rich sample and the control sample galaxies, indicating no significant difference in kinematical signatures such as warping and lopsidedness. Furthermore, we find no difference in position angle and systemic velocity offset with respect to the optical between both sub‐samples. We therefore do not find compelling evidence for enhanced global asymmetry of the H I‐excess galaxies ensemble properties in comparison to the control sample galaxies. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)  相似文献   

SVOM数据档案库软件原型系统的设计与实现   总被引：1，自引：0，他引：1  

王玉涵  黄茂海  刘飞飞 《天文研究与技术》2015,(3)

作为中法天文卫星(Space multi-band Variable Object Monitor,SVOM)中方科学中心的重要组成部分,中法天文卫星数据档案库承担了中方科学数据产品本地存储和管理的任务,提供统一的数据产品管理平台,实现中法天文卫星科学数据产品的归档、检索、检出、维护与管理等功能。作为中法天文卫星科学中心预研的一部分,对中法天文卫星数据档案库原型系统进行了需求分析、系统设计,实现能够运行的原型系统,以演示中法天文卫星数据档案库的基本功能和工作流程,验证设计方案的可行性。档案库原型系统具有开放性和低耦合的特点,能够适应中法天文卫星中方数据产品结构的不断变化,在项目早期即可投入试用并不断完善,满足中法天文卫星的任务需求。  相似文献   

Optical observations of the broad-lined type Ic supernova SN 2012ap     

Zheng Liu  Xu-Lin Zhao  Fang Huang  Xiao-Feng Wang  Tian-Meng Zhang  Jun-Cheng Chen  Tong-Jie Zhang 《天文和天体物理学研究(英文版)》2015,(2):225-236

The optical observations of the type Ic supernova(SN Ic) SN 2012 ap in NGC 1729 are presented. A comparison with other SNe Ic indicates that SN 2012 ap is highly reddened(with E(B- V)host～0.8 mag) and may represent one of the most luminous SNe Ic ever observed, with an absolute V-band peak magnitude of ～-19.3±0.5 mag after extinction correction. The near-maximum-light spectrum shows wide spectral features that are typical of broad-lined SNe Ic. One interesting feature in the spectrum is the appearance of some narrow absorption features that can be attributed to the diffuse interstellar bands, consistent with the large reddening inferred from the photometric method. Based on the light curves and the spectral data, we estimate that SN 2012 ap produced a56 Ni mass of ～ 0.3 ± 0.1M in the explosion, with an ejecta mass of 2.4+0.7-0.7M and a kinetic energy of E5K= 1.1+0.4-0.4× 102 erg. The properties of its progenitor are also briefly discussed.  相似文献   

Convection-permitting regional climate simulation of warm-season precipitation over Eastern China     

Yun  Yuxing  Liu  Changhai  Luo  Yali  Liang  Xudong  Huang  Ling  Chen  Fei  Rasmmusen  Roy 《Climate Dynamics》2020,54(3):1469-1489

Climate Dynamics - Convection-permitting regional climate models have been shown to improve precipitation simulation in many aspects, such as the diurnal cycle, precipitation frequency, intensity...  相似文献