干旱区生态环境知识资源中心(Arid): 会宁剖面黄土粒度记录的MIS3阶段气候变化研究

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	会宁剖面黄土粒度记录的MIS3阶段气候变化研究
其他题名	Huining MIS3 stage climate change nasea on me loess gram stze record
	翟新伟 1; 李富强 2; 吴松 3
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2013
卷号	36 期号:5 页码:773-780
中文摘要	深海氧同位素第三阶段(MIS3)是末次冰期中的一段特殊时期,通过对会宁黄土剖面粒度变化特征的研究分析恢复重建了会宁MIS3阶段古气候。会宁剖面记录了较明显的5次降温事件 Heinrich事件(H2:23.22~23.51 ka, H3: 30.52~31.19 ka, H4: 38.3~39.93 ka, H5: 43.67~44.82 ka, H6: 63.54~64.41 ka),其中的MIS3阶段根据粒度特征分为3 a(46.36~55.48 ka)较为温湿,3b(30.04~46.36 ka)干冷,3c(24.47~30.04 ka)温湿三个阶段,具明显的D-O旋回。
英文摘要	The spatial and temporal pattern of climate change during last glacial/interglacial cycle (e.g. marine oxygen isotope stages from MIS5 to MISl) is the focus of recent global change research. Specially, for Marine Isotope stage 3(MIS3), an important and unique stage in the last glacial periods, numerous research results published are controversial. The Western Loess Plateau is located in transition zone of China’s eastern-southern monsoon region, northwest inland arid area and the high-cold of Tibet Plateau, and it is a zone where the climate and environment changes intricately and sensitively, so the MIS3 stage paleoclimate condition in the Western Loess Plateau has been paid great attention, while the obtained results are not consistent and existed many disputes. To better understand this remarkable period, a 1 200 cm thick loess-paleosol section in Huining located in Longxi Loess Plateau, Gansu Province is studied in more detail. The Huinig loess section is composed of three loess layers (L_1L_1, L_1S_1L_1, L_1L_2) and two paleosol layers(116 cm thick L_1S_1S_1 and 190 cm thick L_1S_1S_2). Based on 6 OSL dating ages and grain size analysis of 500 sub samples, the paleoclimate changes during MIS3 stage are reconstructed. According to Huining grain size characteristics, e.g. mode size, D(0.1), D (0.9), sand/silt/clay percent, specially > 40 mum grain percent and mean size, the most sensitive proxies, the Rb/Sr ratio, three sub-stage are recognized: 3a (L_1S_1S_2, 710-900 cm, 46.36-55.48 ka) more humid, 3b (L_1S_1L_1,370-710 cm, 30.04-46.36 ka) dry, 3c(L_1S_1S_1, 254-370 cm, 24.47-30.04 ka)humid, which are corresponding well with the paleosol / loess/paleosol unit. Compared with the MIS2 and MIS4, weak winter wind and humid during MIS3 are showed by relative low > 40 mum grain percent, mean size and the Rb/ Sr ratio. The recovered paleocliamte in Huining region is comparable with the records from neighborhood area. Five significant cold events-Heinrich events indicated by extremely remarkable grain size peak are also identified (H2: 228-234 cm, 23.22-23.51 ka; H3: 380-394 cm, 30.52-31.19 ka; H4: 542-576 cm, 38.3-39.93 ka; H5: 654-678 cm, 43.67-44.82 ka; H6: 1 068-1 086 cm, 63.54-64.41 ka), while the cold event at 57.5-57.98 ka (942-952 cm) is maybe a local event. Meanwhile, MIS3 has obvious three D-O cycles and three stronger Heinrich events (H3, H4, H5) which occurred in the coldest period during D-O cycle with larger variation amplitude.
中文关键词	会宁 ; 黄土 ; 粒度 ; Heinrich事件
英文关键词	MIS3 Huining Loess MIS3 grain size the Heinrich event
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:4960919
来源机构	兰州大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/229543
作者单位	1.兰州大学地质科学与矿产资源学院, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国; 2.兰州大学, 西部环境教育部重点实验室, 兰州, 甘肃 730000, 中国; 3.兰州大学地质科学与矿产资源学院, 兰州, 甘肃 730000, 中国
推荐引用方式 GB/T 7714	翟新伟,李富强,吴松. 会宁剖面黄土粒度记录的MIS3阶段气候变化研究[J]. 兰州大学,2013,36(5):773-780.
APA	翟新伟,李富强,&吴松.(2013).会宁剖面黄土粒度记录的MIS3阶段气候变化研究.干旱区地理,36(5),773-780.
MLA	翟新伟,et al."会宁剖面黄土粒度记录的MIS3阶段气候变化研究".干旱区地理 36.5(2013):773-780.