DOI: 10.1002/jgrd.50611
论文题名: Transient simulation of orbital-scale precipitation variation in monsoonal East Asia and arid central Asia during the last 150 ka
作者: Li X. ; Liu X. ; Qiu L. ; An Z. ; Yin Z.-Y.
刊名: Journal of Geophysical Research Atmospheres
ISSN: 21698996
出版年: 2013
卷: 118, 期: 14 起始页码: 7481
结束页码: 7488
语种: 英语
英文关键词: arid central Asia
; monsoonal East Asia
; orbital forcing
; precipitation
; transient simulation
Scopus关键词: Atmospheric thermodynamics
; Climate change
; Climate models
; Computer simulation
; Isotopes
; Precipitation (chemical)
; Acceleration technique
; Central Asia
; Community climate system model
; East Asia
; Orbital forcing
; Oxygen isotope records
; Precipitation variation
; Transient simulation
; Incident solar radiation
; acceleration
; arid region
; atmospheric forcing
; monsoon
; Northern Hemisphere
; numerical model
; precipitation (climatology)
; precipitation intensity
; troposphere
; Far East
英文摘要: A long-term transient simulation is conducted using the Community Climate System Model version 3 and the orbital acceleration technique to analyze the impact of insolation change caused by the Earth's orbital forcing on precipitation in the monsoonal East Asia (EA) and arid central Asia (CA) over the past 150 ka. Our results show that annual precipitation in both EA and CA has strong signals of the 20 ka precessional cycles and varies in phase with the Northern Hemisphere (NH) summer insolation. Similar characteristics can also be observed from previously published oxygen isotope records of stalagmites near EA and CA. Composite analyses based on seven precessional cycles suggest that the increase (decrease) in the NH summer (winter) insolation enhances EA (CA) summer (winter) precipitation by modulation of the Asian monsoon (westerly) circulation in summer (winter). When the precession-induced NH summer insolation increases, the Asian summer monsoon circulation is enhanced and EA precipitation increases significantly. Meanwhile, the increase in the summer insolation at the precessional scale is accompanied by a decrease in the winter insolation, which causes dramatic cooling of the troposphere in the lower latitudes. Consequently, the CA winter precipitation increases due to the changes in the temperature gradient and the westerly circulation. Therefore, the responses of the Asian monsoon and westerly circulation to summer and winter insolation variations induced by the precessional cycles determine precipitation in the respective rainy seasons and are the primary cause leading to the synchronous variation patterns of annual precipitation in EA and CA at the orbital scale. Key Points The past 150ka transient simulation is conducted with the CCSM3 There is an in-phase variation of annual precipitation between E Asia and C Asia Precession modulates both Asian summer monsoon and winter westerly circulation ©2013. American Geophysical Union. All Rights Reserved. 资助项目: 41075067
; 41290255
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/63528
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, 10 Fenghui S. Rd., Xi'an 710075, China; School of Human Settlements and Civil Engineering, Xi'An Jiaotong University, Xi'an, China; Department of Marine Science and Environmental Studies, University of San Diego, San Diego CA, United States
Recommended Citation:
Li X.,Liu X.,Qiu L.,et al. Transient simulation of orbital-scale precipitation variation in monsoonal East Asia and arid central Asia during the last 150 ka[J]. Journal of Geophysical Research Atmospheres,2013-01-01,118(14)