Aerosol-forced multidecadal variations across all ocean basins in models and observations since 1920
Aerosol-forced multidecadal variations across all ocean basins in models and observations since 1920
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DOI：
10.1126/sciadv.abb0425
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发表时间：
2020-07
期刊：
影响因子：
13.6
通讯作者：
M. Qin;A. Dai;W. Hua
中科院分区：
文献类型：
--
作者：
M. Qin;A. Dai;W. Hua
火山和人为气溶胶是否对全球类似AMO的数十年气候变化起到了作用？地球气候在十年-几十年的时间尺度上波动很大，经常给我们的社会和环境造成巨大的破坏。这些波动通常是由内部动力引起的，许多研究将它们与北大西洋和太平洋的内部气候模式联系起来。在这里，我们表明，火山和人为气溶胶的变化已经导致了自1920年以来所有海洋盆地的同相、数十年的SST变化。这些强迫变化在时间上类似于大西洋十年振荡(AMO)。与北大西洋不同的是，在北大西洋，气溶胶对地面太阳辐射的间接和直接影响推动了SST的数十年变化，而热带中太平洋和西太平洋大气环流对气溶胶强迫的响应起着重要作用，而气溶胶引起的辐射变化很小。我们的新发现表明，欧亚大陆、北美和其他地区类似AMO的气候变化可能部分是由气溶胶强迫引起的，而不是像以前认为的那样起源于北大西洋海温变化。
Have volcanic and anthropogenic aerosols contributed to AMO-like multidecadal climate variations across the globe? Earth’s climate fluctuates considerably on decadal-multidecadal time scales, often causing large damages to our society and environment. These fluctuations usually result from internal dynamics, and many studies have linked them to internal climate modes in the North Atlantic and Pacific oceans. Here, we show that variations in volcanic and anthropogenic aerosols have caused in-phase, multidecadal SST variations since 1920 across all ocean basins. These forced variations resemble the Atlantic Multidecadal Oscillation (AMO) in time. Unlike the North Atlantic, where indirect and direct aerosol effects on surface solar radiation drive the multidecadal SST variations, over the tropical central and western Pacific atmospheric circulation response to aerosol forcing plays an important role, whereas aerosol-induced radiation change is small. Our new finding implies that AMO-like climate variations in Eurasia, North America, and other regions may be partly caused by the aerosol forcing, rather than being originated from the North Atlantic SST variations as previously thought.