末次盛冰期以来青藏高原东北部共和盆地冬夏季风演化记录

doi:10.7522/j.issn.1000-694X.2013.00060

摘要/Abstract

摘要：

对青藏高原东北部共和盆地冬其剖面的化学元素与粒度分析表明，末次盛冰期以来区域冬夏季风总体上呈现此消彼长的关系，气候出现多次冷干-暖湿旋回。15.82 ka BP之前冬季风最强，夏季风最弱，为末次盛冰期时的冷干气候，但21 ka BP之前气候可能寒冷偏湿。15.82~9.5 ka BP夏季风明显增强，冬季风衰弱，气候明显转暖，其中老仙女木时期（14.7~13.7 a BP）和新仙女木时期（12.1~9.5 ka BP）气候相对冷干，而B-A时期（13.7~12.1 ka BP）气候相对暖湿。全新世以来冬夏季风出现多次波动，9.5~7.0 ka BP夏季风相对较强，气候相对暖湿；7.0~5.1 ka BP冬夏季风强弱交替频繁，气候出现冷干-暖湿旋回；5.1~2.7 ka BP夏季风总体较强，气候温暖湿润；2.7 ka BP 之后冬季风明显增强，气候趋于冷干。此外，区域冬夏季风演变过程与极地冰芯记录的冷暖事件大体一致，可以认为共和盆地气候变化是全球气候变化的区域响应。

关键词: 末次盛冰期, 共和盆地, 冬夏季风演化, 化学元素, , 粒度

Abstract:

Geochemical and grain size analysis on aeolian deposits in the DQ profile from Gonghe Basin, northeastern Qinghai-Tibetan Plateau, indicated that the characteristics of regional winter and summer monsoonal variation was that when one was rising, the other was falling, and the climate had experienced several cold-dry and warm-wet cycles since the last glacial maximum (LGM) period. The cold and dry climate dominated the region in LGM period before 15.82 ka BP due to the stronger winter monsoon and weaker summer monsoon, but the climate was relatively cold and wet before 21 ka BP. In 15.82-9.5 ka BP, the summer monsoon strength increased and winter monsoon tended to be weaker, implying an obviously warm climate. During this period, the relatively cold and dry condition appeared in the Oldest Dryas and Younger Dryas with time of 14.7-13.7 ka BP and 12.1-9.5 ka BP respectively, while relatively warm and wet in 13.7-12.1 ka BP (Blling/Allerd period). The winter and summer monsoon strength presented a frequent fluctuation in Holocene and the relatively warm and wet emergeed in 9.5-7.0 ka BP due to the higher summer monsoon intensity. From 7.0 ka BP to 5.1 ka BP, the cycle of cold-dry and warm-wet climate was corresponding to the frequent fluctuation in winter and summer monsoon. The climate became warm and wet in 5.1-2.7 ka BP, accompanied with increased summer monsoon, but it tended to be cold and dry since 2.7 ka BP due to the enhanced winter monsoon strength. In addition, the evolution of regional winter and summer monsoon was coincident with the warm and cold records from the polar ice core. In other words, it indicated that the climatic variation in Gonghe Basin could be considered as a regional response to Global climate change.

Key words: last glacial maximum period, Gonghe Basin, winter and summer monsoon evolution, chemical elements, grain size

中图分类号:

P532

刘冰1，靳鹤龄1，孙忠1，苏志珠2，张彩霞1. 末次盛冰期以来青藏高原东北部共和盆地冬夏季风演化记录[J]. 中国沙漠, 2013, 33(2): 433-442.

LIU Bing1, JIN He-ling1, SUN Zhong1, SU Zhi-zhu2, ZHANG Cai-xia1. The Record of Winter and Summer Monsoon Evolution in Gonghe Basin, Northeastern Qinghai-Tibetan Plateau since the Last Glacial Maximum Period[J]. JOURNAL OF DESERT RESEARCH, 2013, 33(2): 433-442.

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