| 15万年以来极地冰芯、黄土、深海沉积的对比研究与全球变化 |
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| 引用本文： | 康建成,温家洪.15万年以来极地冰芯、黄土、深海沉积的对比研究与全球变化[J].极地研究,1997,9(2):55-65. |
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| 作者姓名： | 康建成 温家洪 |
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| 作者单位： | 中国极地研究所 |
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| 摘 要： | 由极地冰芯记录、中纬黄土记录和深海沉积记录的对比可得，１５万年以来全球变化的基本框架为：末次间冰期，从距今１４万年开始到约１２．５万年达鼎盛，可分为五个阶段，即冰芯中三次高温期夹两次低温期；黄土中三层古土壤夹两层黄土；深海沉积中三次高海面夹两次低海面。末次冰期，距今８万年到１万年，可分为三个阶段，早、晚冰段和中间的间冰段。早、晚冰段盛期气候寒冷程度相当，但晚冰段最低温持续期更长，造成海面比早期更低。中间的间冰段，至少可分为７个亚段，即４次暖期（４次弱成土古土壤）夹３次冷期。全新世与末次间冰期对比，总体气候变化较平缓。在上述基本框架中，近几年发现，在末次冰期存在许多短周期、高频快速变化事件。这些事件，温度变化幅度达７℃，变化速率为几年到几十年，对应的环境变化速率可能更快。这些事件的引发机理目前还不清楚，有待进一步研究。
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| 关 键 词： | 极地冰芯 黄土 深海沉积 过去15万年全球变化 突变型气候事件 |
COMPREHENSIVE RECORDS OF GLOBAL CHANGE FROM POLAR ICE CORES,LOESS PROFILES AND DEEP SEA CORES FOR LAST 150 000 YEARS |
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| Kang Jiancheng and Wen Jiahong.COMPREHENSIVE RECORDS OF GLOBAL CHANGE FROM POLAR ICE CORES,LOESS PROFILES AND DEEP SEA CORES FOR LAST 150 000 YEARS[J].Chinese Journal of Polar Research,1997,9(2):55-65. |
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| Authors: | Kang Jiancheng and Wen Jiahong |
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| Abstract: | Comparison among records from polar ice cores,middle latitude loess profiles and deep sea cores indicates that,the general framework of global change for last 150 000 years is:The last interglacial,beginning in 140 000 years BP and arriving at a period with great prosperity around 125 000 years BP,can be divided into 5 stages,which are three warm stages with two cold stages in polar ice core records,three paleosoils within two loess layers in loess profiles,and three high sea levels between two low sea levels in deep sea core records. The last glacial,from 80 000 years BP to 10,000 years BP,can be divided into three stages,i.e.,early and later glacial stages and interglacial in the middle. The degrees of cold in early and later glacial stages are almost equivalent,but the duration of lowest temperature in later glacial stage was longer than in the early,so the sea level drops lower in the later than in the early. The interglacial can be divided into 7 terms at least,they were 4 warm terms (4 weak paleosoils) with 3 cold terms. Comparing with last interglacial,the climate change in Holocene is more gently. In this framework,a lot of short term and high frequent events in last glacial have been found recently. In these events,the temperature fluctuation is up to 7℃ in years or decades,the environmental change corresponding may be faster. By now the reason of these rapid changes are still unclear,and needs further studies. |
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| Keywords: | Polar ice core records loess profiles deep sea core records global change for last 150 000 years rapid climate events |
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