Fluid core resonance revealed from a laser extensometer at the Rokko-Takao station, Kobe, Japan     

Atsushi Mukai  Shuzo Takemoto  Takeyasu Yamamoto 《Geophysical Journal International》2004,156(1):22-28

  相似文献   

Recent progress of glaciological studies in China     

LIU Shiyin  WANG Ninglian  DUAN Keqin  XIAO Cunde  DING Yongjian  HAN Haidong 《地理学报》2004,14(4):401-410

Glacier inventory compilation during the past 20 years and modifications of that for the Eastern Pamir and Banggong Lake indicate that there are 46,342 modern glaciers with a total area and volume of 59415 km2 and 5601 km3 respectively in China. These glaciers can be classified into maritime and continental (including sub-continental and extremely continental) types. Researches show that glaciers in China have been retreating since the Little Ice Age and the mass wastage was accelerated during the past 30 to 40 years. Being an important part of glaciological studies in China, ice core climatic and environmental studies on Tibetan Plateau and in the Antarctica have provided abundant, high resolution information about past climatic and environmental evolution over the Tibetan Plateau and Antarctica. Except for different parameters recorded in ice cores relating to climate and environment changes on Tibetan Plateau, records from ice cores extracted from different glaciers show that the discrepancies in climatic and environmental changes on the north and south parts of the plateau may be the consequence of different influencing effects from terrestrial and solar sources. Glaciological and meteorological phenomena imply that Lambert Glacier valley is an important boundary of climate in the east Antarctica, which is thought to be connected with cyclonic activities and Circum-polar Waves over the Antarctica.  相似文献   

Gross thermodynamics of two-component core convection     

David Gubbins  Dario Alfè  Guy Masters  G. David Price  Michael Gillan 《Geophysical Journal International》2004,157(3):1407-1414

  相似文献   

Constraints on density and shear velocity contrasts at the inner core boundary   总被引：3，自引：0，他引：3  

Aimin Cao  Barbara Romanowicz 《Geophysical Journal International》2004,157(3):1146-1151

  相似文献   

Impact of inner core rotation on outer core flow: the role of outer core viscosity     

J. Y. Guo  P. M. Mathews  Z. X. Zhang  J. S. Ning 《Geophysical Journal International》2004,159(1):372-389

  相似文献   

Interannual Variability in Pollen Dispersal and Deposition on the Tropical Quelccaya Ice Cap*     

Carl A. Reese  Kam‐biu Liu 《The Professional geographer》2005,57(2):185-197

Pollen collected from snow samples on the Quelccaya Ice Cap in 2000 and 2001 reveals significant interannual variability in pollen assemblage, concentration, and provenance. Samples from 2000, a La Niña year, contain high pollen concentrations and resemble samples from the Andean forests (Yungas) to the east. Samples from 2001, an El Niño year, contain fewer pollen and resemble those from the Altiplano. We suggest that varying wind patterns under different El Niño/Southern Oscillation (ENSO) conditions may affect the processes of pollen transport over the Altiplano and on the ice cap, although confounding variables such as flowering phenology and sublimation should also be considered  相似文献   

Constraints on the outer-core tangent cylinder using normal-mode splitting measurements     

Miaki Ishii  Adam M. Dziewo&#;ski 《Geophysical Journal International》2005,162(3):787-792

  相似文献   

Ice-core pollen record of climatic changes in the central Andes during the last 400 yr     

Kam-biu Liu  Carl A. Reese 《Quaternary Research》2005,64(2):272-278

This paper presents a high-resolution ice-core pollen record from the Sajama Ice Cap, Bolivia, that spans the last 400 yr. The pollen record corroborates the oxygen isotopic and ice accumulation records from the Quelccaya Ice Cap and supports the scenario that the Little Ice Age (LIA) consisted of two distinct phases—a wet period from AD 1500 to 1700, and a dry period from AD 1700 to 1880. During the dry period xerophytic shrubs expanded to replace puna grasses on the Altiplano, as suggested by a dramatic drop in the Poaceae/Asteraceae (P/A) pollen ratio. The environment around Sajama was probably similar to the desert-like shrublands of the Southern Bolivian Highlands and western Andean slopes today. The striking similarity between the Sajama and Quelccaya proxy records suggests that climatic changes during the Little Ice Age occurred synchronously across the Altiplano.  相似文献   

"干中学"与产业集群核心能力的形成   总被引：2，自引：0，他引：2  

王步芳 《世界地理研究》2005,14(3):37-44

本文构建了产业集群核心能力的分析框架,从理论上说明学习效应是产业集群发展的内生动力,产业集群的学习是一个“干中学”的过程.  相似文献   

北太平洋副热带模态水盐度的年代际变化     

胡睿坤  边志刚  刘子洲  刘聪  翟方国  顾艳镇 《中国海洋大学学报(自然科学版)》2020,(2):9-21

副热带模态水(Subtropical Mode Water;STMW)在气候变化中起着重要作用。本文利用全球高分辨率数值模拟结果,研究了北太平洋STMW核心层盐度(Core Layer Salinity;CLS)的年代际变化及其物理机制。结果表明,CLS存在显著的年代际变化,其空间分布则与背景流场分布特征有关。侵蚀区CLS滞后生成区CLS约1~2年,这主要是海流平流输运引起的。生成区内,STMW的季节循环一般可分为生成期(12-4月)、隔离期(5-6月)和侵蚀期(7-11月),生成期混合层盐度(Mixed Layer Salinity;MLS)决定着隔离期和侵蚀期的CLS,而MLS年代际变化则主要由同太平洋年代际涛动存在负相关性的海表面淡水通量的变化引起。  相似文献