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Seismic attenuation in the lower mantle beneath northeast China constrained from short-period reflected core phases at short epicentral distances

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Earth and Planetary Physics 2019年第6期3卷 537-546页

作者： BaoLong Zhang SiDao Ni YuLin Chen State Key Laboratory of Geodesy and Earth’s Dynamics Institute of Geodesy and Geophysics Chinese Academy of Sciences

The thermal structure of the lower mantle plays a key role in understanding the dynamic processes of the Earth's evolution and mantle convection.Because intrinsic attenuation in the lower mantle is highly sensitive to temperature,determining of the attenuation of the lower mantle could help us determine its thermal state.We attempted to constrain the attenuation of the lower mantle by measuring the amplitude ratios of p to ScP on the vertical component and s to ScS on the tangential component at short epicentral distances for seismic wave data from deep earthquakes in northeast China.We calculated the theoretical amplitude ratios of p to ScP and s to ScS by using ray theory and the axial-symmetric spectral element method AxiSEM,as well as by considering the effects of radiation patterns,geometrical spreading,and ScP reflection coefficients.By comparing the observed amplitude ratios with the synthetic results,we constrained the quality factors as Qα≈3,000 and Qβ≈1,300 in the lower mantle beneath northeast China,which are much larger than those in the preliminary reference Earth model(PREM)model of Qα~800 and Qβ~312.We propose that the lower mantle beneath northeast China is relatively colder than the average mantle,resulting in weaker intrinsic attenuation and higher velocity.We estimated the temperature of the lower mantle beneath northeast China as approximately 300–700 K colder than the global average value.

关键词： seismic attenuation lower mantle northeast China reflected core phases thermal state

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冻梨

疯狂英语（初中天地） 2024年第3期 68-69页

作者：李梓嫣闫明(指导) 黑龙江省大庆市林甸县第二中学不详

冻梨是东北地区独有的水果,是将普通的白梨冰冻变成乌黑色而来。它汁水丰富,口感冰凉绵甜。Are there black pears in the world?Have they gone bad?No,no,no,they are special fruit in northeast China—frozen pears.After November,the temperature in northeast China will drop to zero degree or even lower.And the temperature will rise again until March or April of the next year.

关键词：冻梨 northeast frozen

Liaoning: Building Ice and Snow Tourist Resorts in northeast Asia

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China & The World Cultural Exchange 2022年第1期88卷 39-42页

作者： Wei Yang 不详

In Liaoning Province,there are 30-plus ski resorts and more than 100 ice&snow theme parks covering all the 14 cities of the province.The people can experience the high speed and excitement of skiing as much as they like,while enjoying the in finite fun of ice&snow games including skating,ice gyro,bumper car on ice,ice slide,sleigh,and interesting sports such as ice dragon boat,ice spike crossing,iceboating,etc.

关键词： northeast resort Liaoning

Quadrant-Averaged Structure and Evolution Mechanisms of a northeast Cold Vortex during Its Mature Stage

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Atmospheric and Oceanic Science Letters 2015年第1期8卷 45-51页

作者： LI Wei SHEN Xin-Yong FU Shen-Ming LI Wan-Li Key Laboratory of Meteorological Disaster of Ministry of Education Nanjing University of Information Science and Technology Hebei Meteorological Bureau International Center for Climate and Environment Sciences Institute of Atmospheric Physics Chinese Academy of Sciences China Meteorological Administration Training Center

A northeast China cold vortex(NCCV) that maintained from 0200 UTC 3 July to 0500 UTC 3 July 2013 and caused several heavy rainfall events was analyzed in detail to reveal its quadrant-averaged structure and main maintaining mechanisms during its mature stage. Results indicated the vortex's intensity, divergence, ascending motions, precipitable water(PW), and thermal structures were all characterized by significant unevenness, and their main pattern changed gradually during the mature stage. Mechanisms accounting for the maintenance of the NCCV were also characterized by remarkable unevenness. Within different quadrants, dominant factors for the vortex's evolution may have differed from each other significantly. The NCCV-averaged vorticity budget revealed that the vertical advection of vorticity, which is closely related to convective activities, was the most favorable factor for maintaining the NCCV, whereas the tilting effect, which is closely related to the vertical shear of the horizontal wind(horizontal vorticity), was the most detrimental factor.

关键词： northeast China cold vortex vorticity budget polar

Lost in the northeast

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China Weekly 2023年第7期 48-50页

作者： Yi Ziyi 不详

The highest-rated Chinese TV show in the last five years,suspense drama The Long Season strikes a provocative balance between realism and aesthetic through its portrayals of ordinary people struggling through tremendo... 详细信息

关键词： northeast change. ordinary

Distribution of C_4 plants along the northeast China transect and its correlation to the environmental factors

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Chinese Science Bulletin 1999年第14期44卷 1316-1320页

作者： TANG HaipingOpen Research Laboratory of Environmental Changes and Natural Disaster of the Ministry of National Education, Beijing Normal University , Beijing 100875, Laboratory of Quantitative Vegetation Ecology , Institute of Botany , Chinese Academy of Sciences , Beijing 100093, China Open Research Laboratory of Environmental Changes and Natural Disaster of the Ministry of National Education Beijing Normal University Beijing Laboratory of Quantitative Vegetation Ecology Institute of Botany Chinese Academy of Sciences Beijing China

The distribution of C4 plants and the C4/C3 ratio along northeast China transect （NECT） have been studied. A model to quantify their relation with environmental factors has been set up. The ratio of the number of C4 plants to that of C3 plants along NECT shows two low and two high trends from east to west, and their distribution is mainly decided by annual average temperature and precipitation.

关键词： northeast China transect (NECT) distribution of C4 plants the C4/C3 ratio stepwise regression analysis.

THE CONSTRUCTION AND ITS DEVELOPMENT OFTHE OVERSEAS TRANSPORT SYSTEM IN northeast CHINA

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Chinese Geographical Science 1994年第1期4卷 19-30页

作者：高莎丽刘宁孙丽华 Department of Geography Northeast Normal University Changchun PRC Department of Mathematics Northeast Normal University Changchun PRC

ＴＨＥＣＯＮＳＴＲＵＣＴＩＯＮＡＮＤＩＴＳＤＥＶＥＬＯＰＭＥＮＴＯＦＴＨＥＯＶＥＲＳＥＡＳＴＲＡＮＳＰＯＲＴＳＹＳＴＥＭＩＮＮＯＲＴＨＥＡＳＴＣＨＩＮＡＧａｏＳｈａｌｉ（高莎丽）（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａ... 详细信息

ＴＨＥＣＯＮＳＴＲＵＣＴＩＯＮＡＮＤＩＴＳＤＥＶＥＬＯＰＭＥＮＴＯＦＴＨＥＯＶＥＲＳＥＡＳＴＲＡＮＳＰＯＲＴＳＹＳＴＥＭＩＮＮＯＲＴＨＥＡＳＴＣＨＩＮＡＧａｏＳｈａｌｉ（高莎丽）（ＤｅｐａｒｔｍｅｎｔｏｆＧｅｏｇｒａｐｈｙ，ＮｏｒｔｈｅａｓｔＮｏｒｍ...

关键词： northeast China port construction overseas transport system

First Record of Soft-shelled Turtle(Testudines, Trionychidae) from the Late Pleistocene of Heilongjiang, northeast China

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Acta Geologica Sinica(English Edition) 2021年第4期95卷 1409-1410页

作者： WU Wenhao DONG Nan LI Xiaobo ZHOU Changfu FENG Nan Robert R.REISZ Research Center of Palaeontology&Stratigraphy College of Earth ScienceJilin UniversityChangchun 130026China College of Earth Science Jilin UniversityChangchun 130061China Dinosaur Evolution Research Centre College of Earth ScienceJilin UniversityChangchun 130061China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdaoShandong 266590China Heilongjiang Institute of Geological Sciences Harbin 150080China Department of Biology University of Toronto MississaugaMississaugaON L5L 1C6Canada

Objective Numerous vertebrate fossils, dominated by the Mammuthus–Coelodonta fauna, have been found from many Late Pleistocene fossil sites in Heilongjiang,northeast China(Jin and Kawamura, 1996). However,fossil turtles have not yet been reported. Recently, two soft-shelled turtle(trionychid) costal plates have been discovered together with other typical Mammuthus–Coelodonta fauna fossils.

关键词： Pleistocene northeast northeast

GENETIC TYPES AND CHARACTERISTICS OF GROUND ICE IN northeast CHINA

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Chinese Geographical Science 1999年第2期9卷 70-75页

作者：刘福涛王春鹤宋长春 Changchun Institute of Geography the Chinese Academy of Sciences Changchun P. R. China

１ＧＥＮＥＴＩＣＴＹＰＥＳＯＦＧＲＯＵＮＤＩＣＥＩＮＣＨＩＮＡＧｒｏｕｎｄｉｃｅｉｓｗｅｌｄｅｖｅｌｏｐｅｄｉｎｔｈｅｖｉｃｉｎｉｔｙｏｆｔｈｅｓｏｕｔｈｅｒｎｐｅｒｍａｆｒｏｓｔｌｉｍｉｔｉｎｔｈｅＥｕｒａｓｉａ... 详细信息

１ＧＥＮＥＴＩＣＴＹＰＥＳＯＦＧＲＯＵＮＤＩＣＥＩＮＣＨＩＮＡＧｒｏｕｎｄｉｃｅｉｓｗｅｌｄｅｖｅｌｏｐｅｄｉｎｔｈｅｖｉｃｉｎｉｔｙｏｆｔｈｅｓｏｕｔｈｅｒｎｐｅｒｍａｆｒｏｓｔｌｉｍｉｔｉｎｔｈｅＥｕｒａｓｉａｎｃｏｎｔｉｎｅｎｔ，ｉｎｔｈｅｎ...

关键词： ground ice hazard control northeast China