A 13,000-YEAR CLIMATE RECORD FROM WESTERN TIBET
A 13,000-YEAR CLIMATE RECORD FROM WESTERN TIBET
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DOI：
10.1038/353742a0
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发表时间：
1991-10-24
期刊：
影响因子：
64.8
通讯作者：
ZHANG, QS
中科院分区：
文献类型：
--
作者：
GASSE, F;ARNOLD, M;ZHANG, QS
尽管青藏高原对北半球大气环流的影响非常重要1-3，但连续的古气候记录却很少，而且仅限于青藏高原的东北边缘4-6。在这里，我们展示了苏木错（西藏西部）的 13,000 年前的记录，该记录是根据湖心和海岸线研究构建的，该记录表明全新世早中期的条件比现在更温暖和湿润。这些结果证实了模型预测，由于轨道引起的夏季日照增加 7,8，该地区的季风将在距今 9,000 年左右加强。我们还发现了大约距今 12,500 年和大约 10,000 年的温暖、潮湿脉冲的证据，与最后一次冰消期的步骤同步，并且大约在距今 11-10,000 年返回到寒冷、干燥的条件，这些都不能用轨道变化来解释。寒冷事件的存在证实了与新仙女木事件相关的降温发生在中国大陆6,9，并提供了该事件全球性质的进一步证据10。
ALTHOUGH the Tibetan plateau is important in influencing the atmospheric circulation of the Northern Hemisphere 1-3, there are only a few continuous palaeoclimate records available, and these are limited to the plateau's northeastern margin 4-6. Here we present a 13,000-yr record from Sumxi Co (western Tibet), constructed from both lake-core and shoreline studies, which shows that conditions in the early-middle Holocene were warmer and wetter than at present. These results confirm model predictions of an intensified monsoon over the region at approximately 9,000 yr BP, owing to an orbitally induced increase in summer insolation 7,8. We also find evidence for warm, humid pulses at approximately 12,500 and approximately 10,000 yr BP, in phase with the steps of the last deglaciation, and for a. return to cold, dry conditions at approximately 11-10,000 yr BP, none of which can be explained by orbital variations. The existence of the cold episode confirms that the cooling associated with the Younger Dryas event occurred in continental China 6,9, and provides further evidence of the global nature of this event 10.