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| 40～30 ka BP中国特殊暖湿气候与环境的发现与研究过程的回顾 | |
| 其他题名 | The Special Warm-Humid Climate and Environment in China during 40～30 ka BP: Discovery and Review |
| 施雅风; 赵井东 | |
| ISSN | 1000-0240 |
| 出版年 | 2009 |
| 卷号 | 31期号:1页码:1-10 |
| 中文摘要 | 40～30 ka BP在过去被认为是末次冰期的间冰阶,温度稍高,但仍在冰期内.20世纪90年代西昆仑山古里雅冰芯记录研究首次指出,当时气温可能高出现代4℃,即为以前所不知的间冰期.追踪同期湖泊沉积,孢粉与古生物,黄土与沙漠地区古土壤,石灰岩洞穴中石笋,古河道,滨海地区海相沉积等多种记录,集成研究表明,当时青藏高原与西北干旱区有许多淡水大湖,降水量远比现代丰沛,导致外流水系扩大,如青海境内的黄河上游水系形成.暖湿的气候条下,森林分布区向北向西大范围扩展,华南热带喜湿热的陆均松(Dacrydium sp.)北界移至22°～24°N,表明当时热带气温高于现代2℃左右,降水量也有较大增加.长江下游石笋资料和北方半干旱、半湿润区的植物、古土壤、河道沉积资料均表示降水增加,森林覆盖度大.由于冰川和极地冰盖萎缩,海平面上升,给合若干地区地面沉降,海河下游、长江三角洲和珠江三角洲均出现相当规模的海侵.上述涉及全中国的特殊暖湿环境的形成与地球轨道运行岁差周期变化导致中低纬度日射增强,致使温度升高,季风区与西风带降水量都有显著增加关系密切,而植被改善又对温度和湿度有正反馈作用. |
| 英文摘要 | The period of 40～30 ka BP was regarded as an interstadial of the Last Glaciation in the previous studies, when temperature was slightly increased, but still in glacial period. An unknown interglacial period, the temperature was about 4℃ higher than that at the present, was first obtained on the basis of the Guliya ice core studies. Considering the records from lacustrine sediments, pollen and macrofossils, paleosol in loess and desert sections, stalagmites in karst caves, ancient water course in North China Plain, oceanic deposits in the coastal areas and sea level changes, it is revealed that precipitation during 40～30 ka BP was higher than that at the present in the whole China, and large fresh water lakes occurred in the Tibetan Plateau and the arid areas in Northwest China, enlarging the external drainage areas, such as the water system of the upper reaches of the Yellow River in Qinghai Province came into being. Forest belt expanded northwards and westwards under the warm humid climate at that time. The Dacrydium sp.that lives in the warm and humid climate in the tropical areas in the South China, expanded to 22°～24° N, which indicated that temperature during 40～30 ka BP was about 2℃ higher than that at the present, and precipitation also increased. The stalagmite records from the lower reaches of the Yangtze River and the flora, paleosols, fluvial sediments in the semi-arid and semi-humid regions in North China indicated that precipitation increased and forest area enlarged. Large transgressions occurred in the western coasts of Bohai and delta areas of the Yangtze River and Pearl River due to mountain glaciers and ice sheets in the polar areas retreating, sea level rising and the subsidence of these areas.The special warm humid climate in China has a strong relationship with the higher July insolation in the mid and low latitudes during 40～30 ka BP as compared with that in today, which was mainly due to the change in the perihelion of the orbital parameters. Higher July insolation caused temperature rising and precipitation increasing in monsoon and westerly areas, and the improved vegetation has a positive feedback to the temperature and humidity. |
| 中文关键词 | 特殊暖湿气候 ; 古里雅冰芯 ; 岁差周期 ; 季风与西风 |
| 英文关键词 | 40～30kaBP 40～30 ka BP special warm-humid climate Guliya ice core precessional cycle monsoon and westerly |
| 语种 | 中文 |
| 国家 | 中国 |
| 收录类别 | CSCD |
| WOS类目 | GEOLOGY |
| WOS研究方向 | Geology |
| CSCD记录号 | CSCD:3558496 |
| 来源机构 | 中国科学院西北生态环境资源研究院 |
| 资源类型 | 期刊论文 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/223274 |
| 作者单位 | 中国科学院寒区旱区环境与工程研究所, 冰冻圈科学国家重点实验室, 兰州, 甘肃 730000, 中国 |
| 推荐引用方式 GB/T 7714 | 施雅风,赵井东. 40～30 ka BP中国特殊暖湿气候与环境的发现与研究过程的回顾[J]. 中国科学院西北生态环境资源研究院,2009,31(1):1-10. |
| APA | 施雅风,&赵井东.(2009).40～30 ka BP中国特殊暖湿气候与环境的发现与研究过程的回顾.,31(1),1-10. |
| MLA | 施雅风,et al."40～30 ka BP中国特殊暖湿气候与环境的发现与研究过程的回顾".31.1(2009):1-10. |
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