内蒙古西部阿拉善沙漠地区末次冰盛期和全新世中期的水汽来源——依据现代气象过程、古气候模拟和地质记录的综合解译（英文）

论文摘要

Knowledge of moisture sources is of great significance for understanding climatic change and landscape evolution in desert environments. In this paper, we aim to clarify moisture origins for the Alashan（Alxa） Sand Seas（ALSS） in western Inner Mongolia and their transport pathways during the Last Glacial Maximum（LGM） and the mid-Holocene using modern analogues and paleoclimatic simulations. Precipitation data for the period 1959–2015 from meteorological stations in the study area and wind and specific humidity data from the European Center for Medium-Range Weather Forecasts（ECMWF） daily reanalysis were adopted to determine the moisture sources of summer precipitation in the ALSS. In addition paleoclimate simulations under PMIP3/CMIP5 protocols were used to detect the atmospheric circulation and precipitation at 21 ka BP and 6 ka BP over the ALSS. We also reviewed paleoclimate records from the ALSS to acquire a semi-quantitative reconstruction of the moisture history during the late Pleistocene and Holocene. Our results suggest that the summer monsoon transported water vapor from the Indian Ocean and the South China Sea to the ALSS during July and August, causing increased precipitation. The dominant moisture source was from the southwest monsoon, while the East Asian summer monsoon also partly contributed to precipitation in the ALSS. The increased humidity during the period 8.2–4.2 ka BP in the ALSS, as derived from both climate simulation outputs and sedimentary records, was caused by monsoons according to the outputs of simulations. At 21 ka BP, the moisture sources of the ALSS were greatly associated with the prevailing westerlies.

论文目录

• 1 Introduction
• 2 Geological and physiographical settings
• 3 Methods
•   3.1 Modern climate analogues
•   3.2 Climate simulation
•   3.3 Proxy records
• 4 Results
•   4.1 Modern moisture sources
•   4.2 Simulated paleomoisture sources
•   4.3 Moisture history of the ALSS interpreted from a synthesis of published records
•     4.3.1 The late Pleistocene
•     4.3.2 The Holocene
• 5 Discussion
•   5.1 The mechanism of moisture evolution in the ALSS
•   5.2 Comparison with paleoclimate proxy records
•   5.3 Relationship between monsoon intensity and ALSS moisture history
• 6 Conclusions

文章来源

类型: 期刊论文

作者: 冯滢瑛,杨小平

来源: Journal of Geographical Sciences 2019年12期

年度: 2019

分类: 基础科学

专业: 地质学

单位: Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,CAS,Department of Geography,School of Earth Sciences,Zhejiang University

基金: National Natural Science Foundation of China,No.41430532,No.41672182

分类号: P532

页码: 2101-2121

总页数: 21

文件大小: 23129K

下载量: 96