Anthropogenic Aerosols Cause Recent Pronounced Weakening of Asian Summer Monsoon Relative to Last Four Centuries

0506276 - ÚVGZ 2020 RIV US eng J - Journal Article
Liu, Y. - Cai, W. - Sun, C. - Song, H. - Cobb, K. M. - Li, J. - Leavitt, S. - Wu, L. - Cai, Q. - Liu, R. - Ng, B. - Cherubini, P. - Büntgen, Ulf - Song, Y. - Wang, G. - Lei, Y. - Yan, L. - Li, Q. - Ma, Y. - Fang, C. - Sun, J. - Li, X. - Chen, D. - Linderholm, H. W.
Anthropogenic Aerosols Cause Recent Pronounced Weakening of Asian Summer Monsoon Relative to Last Four Centuries.
Geophysical Research Letters. Roč. 46, č. 10 (2019), s. 5469-5479. ISSN 0094-8276. E-ISSN 1944-8007
Research Infrastructure: CzeCOS II - 90061
Institutional support: RVO:86652079
Keywords : tree-ring width * annual precipitation * east-asia * china * climate * variability * reconstruction * region * index
OECD category: Geology
Impact factor: 4.497, year: 2019
Method of publishing: Open access
https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2019GL082497

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. 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 ASM variability back to 1566 CE. The reconstruction captures weak/strong ASM events and also reflects major locust plagues. 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. Our coupled climate model shows that increasing anthropogenic sulfate aerosol emissions over the Northern Hemisphere could be the dominant factor contributing to the ASM decrease.
Permanent Link: http://hdl.handle.net/11104/0297566