青藏高原第四纪冰期序列及其意义

普兰丁喀里山口和理塘海子山地区第四纪冰川遗迹的研究进一步证实,近２Ｍａ来,青藏高原经历过５次冰期和４次间冰期。青藏高原第四纪冰期序列的研究,对于完善大陆第四纪冰期序列、研究全球变化、认识中国东部第四纪冰川作用都具有重要意义。     

蓝色新事

联合国政府间气候变化专门委员会近期在斯德哥尔摩审议并通过了关于气候变化的自然科学基础报告。报告显示，全球变暖证据确凿，北极冰川融化速度已经翻了一倍，海平面上升速度加快。如果温室气体排放有增无减，地球将面临不可想象的灾难。     

祁连山冰川:正在远去

横亘在甘肃与青海交界处的祁连山，在中国西部算不上大山，但由于其特殊的生态作用而成为人们关注的焦点。     

“中华水塔”蓄水量正在下降

青藏高原是亚洲许多大江大河，如长江、黄河、澜沧江、怒江和雅鲁藏布江的发源地，被称为中华民族的。水塔”。从2003年开始，中国地质调查局组织开展了青藏高原生态地质环境遥感监删项目。调查监测结果表明，30年来青藏高原冰川总体呈明显减少趋势，边部雪线退缩强烈，腹地雪线少量上升。其中高原周边冰川面积消减最为明显．面积减小10％以上；高原腹地冰川面积减小近5％。“中华水塔”蓄水总量正在下降。     

新发现

马山古洞；门头沟发现250万年前冰川遗迹。     

大围山：《冰河世纪Ⅳ》的烙印

1934年，李四光来到江西庐山，看着眼前完美的U型谷、冰擦痕和冰臼，他彻底地被震撼了。这，就是存在了至少50万年的第四纪冰川啊。而在20世纪初，一些外国专家断言“中国绝不可能有第四纪冰川遗迹”。     

EVIDENCE FOR ABRUPT CLIMATIC CHANGES ONNORTHWESTERN MARGIN OF EAST ASIAN MONSOON REGION DURING LAST DEGLACIATION

Based on investigations of the Zhongwei Nanshan aeolian section situated in the southeastern margin of Tengger Dcsert, carbon-14 and TL (thermoluminescence) dating results and paleoclimatic proxies such as magnetic susceptibility and grain size, we inferred that the northwestern margin of East Asian monsoon region experienced abrupt climatic changes during the last deglaciation. Six oscillation events were identified: Oldest Dryas, Belling, Older Dryas, AllerФd, lntra-AllerФd Cold Period (1ACP) and Younger Dryas (YD). The summer monsoon was weaker during Oldest Dryas and Younger Dryas when the winter monsoon was stronger. However, during the B/A (BФlling/AllerФd) period, the summer monsoon strengthened, reflected by magnetic susceptibility, when the winter monsoon also became strong, which is different from the paleoclimatic pattern established in the East Asian monsoon region. Furthermore,the summer monsoon was nearly in phase with the climate changes inferred from the oxygen isotopic records of Greenland ice cores. It could be speculated that the variations of the sea ice cover in the high latitudes of the North Hemisphere affected the high pressure of Asian continent and the changes of the winter monsoon inland. On the other hand,the sea ice cover variations might have indirectly caused the occurrence of ENSO events that has tightly been related to the summer monsoon in northwest margin of East Asian monsoon region.     

新疆城市体系地理分析

分析了新疆城市体系的范围、规模、分布及潜力等几方面的特点,对城市体系今后的发展趋势作了必要分析。     

中国城市地理学近期进展

中国城市地理学的兴盛时期始于70年代中期,至80年代进入历史以来最旺盛的发展时期。城市地理学主要研究城市体系、城市化、城市地域结构与具体的大小城镇。其重要的实践领域则主要通过城市规划和区域规划、国土规划。特别是70年代中期借助于我国城市规划工作的复兴,为城市地理学的发展提供了广阔的实践基础。