Zonal mean and shift modes of historical climate response to evolving aerosol distribution
Zonal mean and shift modes of historical climate response to evolving aerosol distribution
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DOI：
10.1016/j.scib.2021.07.013
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发表时间：
2021-11-05
期刊：
影响因子：
18.9
通讯作者：
Xiang, Baoqiang
中科院分区：
文献类型：
--
作者：
Kang, Sarah M.;Xie, Shang-Ping;Xiang, Baoqiang
人为气溶胶是干扰地球气候的有效辐射强迫因子。1980年代前后，主要排放源从西半球转移到东半球。一个地球系统模式的单一强迫模拟的集合揭示了两个阶段的气溶胶引起的气候变化，分别响应于全球气溶胶增加1940-1980年和气溶胶强迫的纬向移动1980-2020年。在这里，使用理想化的实验与分层模型，我们表明，气溶胶的气溶胶增加和转变模式的气溶胶强迫气候变化是动态不同的，由半球间的能量传输和流域范围的海洋-大气相互作用，分别。气溶胶增加模式占主导地位的静止板海洋模式，但阻尼海洋动力学。无纬向平均能量扰动，其特征是异常的北大西洋变暖和北太平洋变冷，纬向移动模式放大通过Bjerknes反馈的相互作用的海洋动力学。这两种模式都有助于在赤道太平洋上形成类似拉尼娜的模式。我们认为，一个全球的角度来看，适应不断变化的气溶胶排放的地理分布是至关重要的气溶胶强迫的历史气候变化的理解。(c)中国科学出版社.爱思唯尔公司、科学中国出版社出版。All rights reserved.
Anthropogenic aerosols are effective radiative forcing agents that perturb the Earth's climate. Major emission sources shifted from the western to eastern hemisphere around the 1980s. An ensemble of single-forcing simulations with an Earth System Model reveals two stages of aerosol-induced climate change in response to the global aerosol increase for 1940-1980 and the zonal shift of aerosol forcing for 1980-2020, respectively. Here, using idealized experiments with hierarchical models, we show that the aerosol increase and shift modes of aerosol-forced climate change are dynamically distinct, governed by the inter-hemispheric energy transport and basin-wide ocean-atmosphere interactions, respectively. The aerosol increase mode dominates in the motionless slab ocean model but is damped by ocean dynamics. Free of zonal-mean energy perturbation, characterized by an anomalous North Atlantic warming and North Pacific cooling, the zonal shift mode is amplified by interactive ocean dynamics through Bjerknes feedback. Both modes contribute to a La Nina-like pattern over the equatorial Pacific. We suggest that a global perspective that accommodates the evolving geographical distribution of aerosol emissions is vital for understanding the aerosol-forced historical climate change. (c) 2021 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved.