DOI: 10.5194/cp-14-577-2018
Scopus记录号: 2-s2.0-85046071061
论文题名: Timescale dependence of the relationship between the East Asian summer monsoon strength and precipitation over eastern China in the last millennium
作者: Shi J. ; Yan Q. ; Wang H.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2018
卷: 14, 期: 4 起始页码: 577
结束页码: 591
语种: 英语
Scopus关键词: climate forcing
; climate modeling
; Little Ice Age
; Medieval Warm Period
; monsoon
; paleoclimate
; periodicity
; precipitation (climatology)
; proxy climate record
; reconstruction
; summer
; timescale
; China
英文摘要: Precipitation/humidity proxies are widely used to reconstruct the historical East Asian summer monsoon (EASM) variations based on the assumption that summer precipitation over eastern China is closely and stably linked to the strength of EASM. However, whether the observed EASM-precipitation relationship (e.g., increased precipitation with a stronger EASM) was stable throughout the past remains unclear. In this study, we used model outputs from the Paleoclimate Modelling Intercomparison Project Phase III and Community Earth System Model to investigate the stability of the EASM-precipitation relationship over the last millennium on different timescales. The model results indicate that the EASM strength (defined as the regionally averaged meridional wind) was enhanced in the Medieval Climate Anomaly (MCA; ĝ1/4 ĝ€950-1250ĝ€AD), during which there was increased precipitation over eastern China, and weakened during the Little Ice Age (LIA; ĝ1/4 ĝ€1500-1800ĝ€AD), during which there was decreased precipitation, consistent with precipitation/humidity proxies. However, the simulated EASM-precipitation relationship is only stable on a centennial and longer timescale and is unstable on a shorter timescale. The nonstationary short-timescale EASM-precipitation relationship broadly exhibits a multi-decadal periodicity, which may be attributed to the internal variability of the climate system and has no significant correlation to external forcings. Our results have implications for understanding the discrepancy among various EASM proxies on a multi-decadal timescale and highlight the need to rethink reconstructed decadal EASM variations based on precipitation/humidity proxies. © Author(s) 2018. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109572
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science and Technology, Nanjing, 210044, China; Nansen-Zhu International Research Centre, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
Recommended Citation:
Shi J.,Yan Q.,Wang H.. Timescale dependence of the relationship between the East Asian summer monsoon strength and precipitation over eastern China in the last millennium[J]. Climate of the Past,2018-01-01,14(4)