南极洲万达盐湖形成的某些问题     

于升松格林.  WJ 《地理科学》1992,12(1):65-70

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全球气候变暖恶果终现——南极冰融在加快     

《地图》2007,(6):8-8

美国宇航局NASA从最近的卫星图像发现,南极洲的冰雪消融是近30年来最严重的,并有明显迹象表明,冰层融化的速度还在加快,也表明全球变暖同时在加速。  相似文献   

气候的冰年表     

朱佛宏 《海洋地质前沿》2009,25(4):42-42

2006年4月由日本国家极地研究所冰川研究工作者采自南极洲的冰年龄为100万年。与已揭露的最近65000年大气动力学的埃比克（Э∏ик）计划所获得的钻探资料相比，采白深度超过3000m钻孔的该冰岩心将已有的气候研究史扩展了20000年。但是预期，这个新记录将被打破，国为很快将获得年龄为120万年的冰岩心。  相似文献   

南极洲冰消作用的陆上记录：地形学和宇宙成因同位素分析     

Michael  Bentley  蔡观强 《海洋地质》2009,(1)

宇宙成因同位素分析改变了我们对南极冰消的滨岸记录的认识。最近的研究表明南极冰盖的不同部分其冰消历史存在鲜明的对照。目前，似乎存在两种独特的模式。第一种模式，紧随冰后期升温初期，冰盖迅速发生撤退的地方，就已经达到了全新世早期冰盖边缘。第二种模式，冰后期升温后初始发生冰川消融的地方，经历几个百万年的逐渐减薄，并且从那时起一直持续到现在。而理解哪种模式应用于哪个地区最好，就显得非常重要。因为这能为我们提供很多关于冰盖撤退驱动机制的信息，同时有助于对冰盖变化进行预测的模拟研究。  相似文献   

南极洲政策中不可不提的苏联因素     

朱瑾 《海洋世界》2008,(10):37-40

第二次世界大战后，苏联积极参与南极洲的考察活动，并建立考察站。受到苏联因素的牵制，美国最终停止主权要求（并未放弃），转而召集南极会议，推动南极中立化。  相似文献   

Minimum Bedrock Exposure Ages and Their Implications: Larsemann Hills and Neighboring Bolingen Islands, East Antarctica     

HUANG Feixin  LI Guangwei  LIU Xiaohan  KONG Ping  JU Yitai  David FINK  FANG Aimin  YU Liangjun 《《地质学报》英文版》2010,84(3):543-548

<正>Considerable controversy exists over whether or not extensive glaciation occurred during the global Last Glacial Maximum(LGM) in the Larsemann Hills.In this study we use the in situ produced cosmogenic nuclide ~(10)Be(half life 1.51 Ma) to provide minimum exposure ages for six bedrock samples and one erratic boulder in order to determine the last period of deglaciation in the Larsemann Hills and on the neighboring Bolingen Islands.Three bedrock samples taken from Friendship Mountain(the highest peak on the Mirror Peninsula,Larsemann Hills;～2 km from the ice sheet) have minimum exposure ages ranging from 40.0 to 44.7 ka.The erratic boulder from Peak 106(just at the edge of the ice sheet) has a younger minimum exposure age of only 8.8 ka.The minimum exposure ages for two bedrock samples from Blundell Peak(the highest peak on Stornes Peninsula,Larsemann Hills;～2 km from the ice sheet) are about 17 and 18 ka.On the Bolingen Islands(southwest to the Larsemann Hills;～10 km from the ice sheet),the minimum exposure age for one bedrock sample is similar to that at Friendship Mountain(i.e.,44 ka).Our results indicate that the bedrock exposure in the Larsemann Hills and on the neighboring Bolingen Islands commenced obviously before the global LGM(i.e.,20-22 ka),and the bedrock erosion rates at the Antarctic coast areas may be obviously higher than in the interior land.  相似文献   

Thermodynamic properties of snow cover on sea ice during the austral summer in Prydz Bay,East Antarctica     

HAN Hongwei  CHENG Peng  LI Zhijun  LEI Ruibo  LU Peng 《极地研究(英文版)》2014,(1):10-16

The thermodynamic properties of snow cover on sea ice play a key role in the ice-ocean-atmosphere system and have been a focus of recent scientific research. In this study, we investigated the thermodynamic properties of snow cover on sea ice in the Nella Fjord, Prydz Bay, East Antarctica(69°20′S, 76°07′E), near the Chinese Antarctic Zhongshan Station. Our observations were carried out during the 29th Chinese National Antarctic Research Expedition. We found that the vertical temperature profile of snow cover changed considerably in response to changes in air temperature and solar radiation during the summer. Associated with the changes in the temperature profile were fluctuations in the temperature gradient within the upper 10 cm of the snow cover. Results of previous research have shown that the thermal conductivity of snow is strongly correlated with snow density. To calculate the thermal conductivity in this study, we measured densities in three snow pits. The calculated thermal conductivity ranged from 0.258–0.569 W?m-1?K-1. We present these datasets to show how involved parameters changed, and to contribute to a better understanding of melting processes in the snow cover on sea ice.  相似文献   

科学调查船“谢尔盖&#183;瓦维洛夫院士”号在南极洲西北部进行地质—地貌调查研究     

ННДунасв  ЛРМерклин  朱佛宏 《海洋地质前沿》2008,24(9)

现今，“南极洲”这一术语表示了地球南极锋面线——南纬50&#176;～60&#176;海水会聚线以南的空间。近年来对这个区域的研究明显加强。2004年32届地质大会（意大利弗洛伦萨）指出，最近的南极洲研究成果开创了地质学的新领域，联合国教科文组织宣布南极洲为科学的新大陆。对南极地区研究的增强趋势得到了2004年7月在德国不来梅召开的第28届南极地区国际科学讨论会的支持，2005年通过了在20072008年度国际极地年，组织制定了地球南、北极地区广泛的、多方面调查研究的决议。  相似文献   

南极洲东部大规模的地壳分层：来自混染地幔源区继承锆石的U—Pb研究证据     

Evgeny  Mikhalskiy  Boris  Belyatsky  Sergey  Sergeev  蔡观强 《海洋地质》2009,(1)

我们分析了Schirmacher Oasis（Dronning Maud Land，DML）和PrinceCharles山脉（PCM）南部的基性岩墙中锆石颗粒的SHRIMP年龄。SchirmacherOasis地区的侏罗纪基性岩墙具有亲石元素弱富集的特征，表明它们受到了地壳混染作用的改造；DML中部地区在中元古代（MP，1150～1050Ma）经历了构造活动这一阶段，而这一事件叠加了新元古晚期高级变质事件（NP，700～510Ma）。这些基性岩墙为含橄榄石高镁过渡性至碱性基性岩类，并且含有从同化物质中继承下来的锆石颗粒。每颗锆石进行50次分析，所得年龄结果几乎是一致的。  相似文献   

Summer fast ice evolution off Zhongshan Station,Antarctica     

雷瑞波  李志军  张占海  程言峰  窦银科 《极地研究(英文版)》2008,19(1):54-62

Based on the field data acquired in the program of fast ice observation off Zhongshan Station, Prydz Bay, East Antarctica during the austral summer 2005/ 2006, physical properties evolution of fast ice during the ice ablation season is analyzed in detail. Results show that the annual maximum ice thickness in 2005 occurred in later November, and then ice started to reek, and the ablation duration was 62 days; sea water under the ice became warmer synchronously; corresponding to the warming sea ice temperature, a ＂relative cold mid-layer＂ appeared in sea ice; the fast ice marginal line recoiled back to the shore observably, and the recoil distance was 20.9 km from 18 December 2005 through 14 January 2006. In addition, based on the data of sea ice thickness survey along the investigation course of MV Xuelong on December 18 of 2005, the ice thickness distribution paten in the marginal ice zone have been described ： sea ice thickness increased, but the diversity of floe ice thick-ness decreased from open water to fast ice zone distinctly.  相似文献