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人为气溶胶排放导致最近80年东亚夏季风在过去四个世纪以来空前减弱
Anthropogenic aerosols cause recent pronounced weakening of Asian Summer Monsoon relative to last four centuries

刘禹 ^1,2,3,4 ^* 蔡文炬 ^3,5,6,1 孙长峰 ¹ 宋慧明 ^1,3 Cobb Kim M ⁷ 李建平 ^3,5 Leavitt Steven W ⁸ 吴立新 ³ 蔡秋芳 ^1,3 刘若时 ⁹ Benjamin Ng ⁶ Paolo Cherubini ¹⁰ Ulf Buntgen ^11,10,12 宋怡 ¹ 王国建 ^3,6 雷莺 ¹ 晏利斌 ¹ 李强 ^1,3 马永永 ¹³ 方丛羲 ¹ 孙军艳 ¹ 李旭祥 ⁹ Chen Deliang ¹⁴ Linderholm Hans W ¹⁴

文摘	亚洲夏季风(Asian Summer Monsoon, ASM)对亚洲数十亿人口的生存、亚洲生态系统和生物多样性的分布、以及农业生产(粮食安全)和工业活动影响严重。因此了解ASM过去时空变化及其动力学过程对陆地生态系统、水资源、森林和景观研究至关重要。近几十年,器测记录显示以降水量为代表的ASM强度一直在减弱,但这一减弱趋势的起始时间和动力学过程尚不清楚。为此,第一次集成了 ASM西部-中部边缘带10个对降水敏感的树木年轮宽度年表,重建了公元1566年以来反映ASM强度变化的降水序列。重建结果不仅捕捉到了 ASM过去4个世纪以来强弱变化历史,也反映出历史上蝗灾与弱季风的关联。特别是发现了最近80年具有过去448年中前所未有的、最为强烈的、显著且持续时间最长的ASM强度减弱趋势。这一减弱趋势与在温室效应影响下ASM本该增强的预期大相庭径。耦合气候模型实验表明,北半球人为硫酸盐气溶胶排放的逐渐增加,对ASM减弱起了决定性作用。
其他语种文摘	Background, aim, and scope The Asian Summer Monsoon (ASM) affects ecosystems, biodiversity, and food security of billions of people. In recent decades, ASM strength (as represented by precipitation) has been decreasing, but instrumental measurements span only a short period of time. The initiation and the dynamics of the recent trend are unclear. As a result, the properties of the recent ASM decreasing trend, including whether it is a part of a longer-term trend must be understood. Several forcing factors may affect the strength of the ASM, including solar variability, volcanic eruptions, and anthropogenic aerosols. So how aerosols and the ASM interact will also be examined given that concentration of aerosols in northwest China has been increasing over the past several decades. Materials and methods Here for the first time, we use an ensemble of 10 tree ring-width chronologies from the west-central margin of ASM, to reconstruct detail of monsoonal precipitation variability from July of previous year to June of current year (P_(JJ)) back to 1566 CE. The 10 tree ring-width chronologies are selected on the basis that they are sensitive only to rainfall, providing not only a higher-resolution but also an appropriate and direct proxy of the ASM over reconstruction from previous studies. Results The reconstructed P_(JJ) time series is a proxy for the ASM, measuring the ASM strength over its marginal zone. The reconstruction captures weak/strong ASM events, and it is found that historical severe droughts and locust plague disasters both appear during weak ASM events. Notably, we found an unprecedented 80-year trend of decreasing ASM strength within the context of the 448-year reconstruction, which is contrary to what is expected from greenhouse warming. Comparison of two sets of historical model experiments (10 runs each) with and without increasing anthropogenic aerosols shows that this unprecedented decreasing trend is likely due to increasing anthropogenic aerosols, highlighting that the ASM-weakening effect of increasing anthropogenic sulfate aerosols could more than offset the ASM-enhancing effect of increasing greenhouse gases. Discussion Modeling is the only way to identify likely causes of the decreasing trend, and the results support a mechanism that would otherwise be difficult to measure directly. Our work further confirmed that anthropogenic aerosol's role in the ASM weakening in a longer period of 1934-2013, compared with previous study which spans 44 years (1958-2001). Besides the increase of sulfate aerosols, other factors, such as PDO and NAO, might have influences on the monsoon weakening, especially during historical periods without anthropogenic aerosols. Conclusions Our reconstruction provides an important time series to study the ASM over the past 448 years. The time series confirms known properties of the ASM (e.g., the 24-year frequency spectrum), reproduces known historical extreme climate events, and offers opportunities to understand less-known events. Further, the reconstruction can contribute to the debate regarding the recent behavior of the ASM and help evaluate the relative importance of anthropogenic radioactive forcing factors. Recommendations and perspectives We expect that the time series will find a wide range of utility for understanding past climate variability and for predicting future climate change.
来源	地球环境学报 ,2019,10(6):527-542 【扩展库】
DOI	10.7515/JEE192062
关键词	东亚夏季风 ; 树木年轮 ; 降水重建 ; 人为气溶胶 ; ASM减弱趋势
地址	1. 中国科学院地球环境研究所, 黄土与第四纪地质国家重点实验室, 西安, 710061 2. 中国科学院第四纪科学与全球变化卓越创新中心, 中国科学院第四纪科学与全球变化卓越创新中心, 西安, 710061 3. 青岛海洋科学与技术试点国家实验室-海洋动力过程与气候功能实验室, 青岛海洋科学与技术试点国家实验室-海洋动力过程与气候功能实验室, 青岛, 266237 4. 北京师范大学地球科学前沿交叉研究中心和全球变化研究联合中心, 北京, 100875 5. 中国海洋大学, 物理海洋教育部重点实验室和青岛海洋科学与技术国家实验室, 青岛, 266237 6. CSIRO Marine and Atmospheric Research, Australia, Aspendale, VIC 3195 7. School of Earth and Atmospheric Sciences, Georgia Institute of Technology, USA, Atlanta, GA 30332 8. The Laboratory of Tree-Ring Research, The University of Arizona, USA, Tucson, AZ 85721 9. 西安交通大学人居环境与建筑工程学院, 西安, 710049 10. Swiss Federal Institute for Forest, Snow and Landscape Research, Switzerland, Birmensdorf, CH-8903 11. Department of Geography, University of Cambridge, UK, Cambridge, CB2 3EN 12. Global Change Research Centre and Masaryk University, Czech Republic, Brno, 60177 13. 陕西省气象局, 西安, 710014 14. Climate Group, Department of Earth Sciences, University of Gothenburg, Sweden, Gothenburg, SE-405 30
语种	中文
文献类型	研究性论文
ISSN	1674-9901
基金	国家自然科学基金 ; 大气重污染成因与治理攻关项目 ; 中国科学院项目 ; 中国科学院地球环境研究所黄土与第四纪地质国家重点实验室基金
文献收藏号	CSCD:6663822

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人为气溶胶排放导致最近80年东亚夏季风在过去四个世纪以来空前减弱 Anthropogenic aerosols cause recent pronounced weakening of Asian Summer Monsoon relative to last four centuries

人为气溶胶排放导致最近80年东亚夏季风在过去四个世纪以来空前减弱
Anthropogenic aerosols cause recent pronounced weakening of Asian Summer Monsoon relative to last four centuries