Asymmetrical response of summer rainfall in East Asia to CO2 forcing

被引:27
|
作者
Song, Se-Yong [1 ]
Yeh, Sang-Wook [1 ]
An, Soon-Il [2 ,3 ]
Kug, Jong-Seong [3 ,4 ]
Min, Seung-Ki [3 ,4 ]
Son, Seok-Woo [5 ]
Shin, Jongsoo [2 ]
机构
[1] Hanyang Univ, Dept Marine Sci & Convergence Technol, Ansan 15588, South Korea
[2] Yonsei Univ, Dept Atmospher Sci, Irreversible Climate Change Res Ctr, Seoul 03722, South Korea
[3] Pohang Univ Sci & Technol, Div Environm Sci & Engn, Pohang 37673, South Korea
[4] Yonsei Univ, Inst Convergence Res & Educ Adv Technol, Incheon 21983, South Korea
[5] Seoul Natl Univ, Sch Earth & Environm Sci, Seoul 08826, South Korea
基金
新加坡国家研究基金会;
关键词
CO2; concentration; East Asian summer monsoon; Asymmetric rainfall; El Nino-like warming; CLIMATE-CHANGE; ATMOSPHERIC TELECONNECTIONS; TROPICAL RAINFALL; MONSOON; PACIFIC; ENSO; CIRCULATION; REMOVAL; PRECIPITATION; REVERSIBILITY;
D O I
10.1016/j.scib.2021.08.013
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Understanding the regional hydrological response to varying CO2 concentration is critical for cost-benefit analysis of mitigation and adaptation polices in the near future. To characterize summer monsoon rainfall change in East Asia in a changing CO2 pathway, we used the Community Earth System Model (CESM) with 28 ensemble members in which the CO2 concentration increases at a rate of 1% per year until its quadrupling peak, i.e., 1468 ppm (ramp-up period), followed by a decrease of 1% per year until the present-day climate conditions, i.e., 367 ppm (ramp-down period). Although the CO2 concentration change is symmetric in time, the amount of summer rainfall anomaly in East Asia is increased 42% during a rampdown period than that during a ramp-up period when the two periods of the same CO2 concentration are compared. This asymmetrical rainfall response is mainly due to an enhanced El Nino-like warming pattern as well as its associated increase in the sea surface temperature in the western North Pacific during a ramp-down period. These sea surface temperature patterns enhance the atmospheric teleconnections and the local meridional circulations around East Asia, resulting in more rainfall over East Asia during a ramp-down period. This result implies that the removal of CO2 does not guarantee the return of regional rainfall to the previous climate state with the same CO2 concentration. (C) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.
引用
收藏
页码:213 / 222
页数:10
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