北太平洋海表面温度对亚洲偶极子型人为气溶胶排放的响应特征和机理
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中国海洋大学

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国家自然科学基金项目(面上项目,重点项目,重大项目)


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Response of North Pacific sea surface temperature to Asian dipole anthropogenic aerosol emissions pattern and its mechanisms
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The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)

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    摘要:

    利用第六次耦合模式比较计划中的人为气溶胶单一强迫模拟试验以及区域气溶胶模式比较计划中的东亚和南亚单一区域模拟试验,研究了21世纪10年代以来亚洲内部出现的“东亚减排、南亚增排”的偶极子型人为气溶胶排放特征对北太平洋海表面温度的影响以及其物理机制。研究发现,在人为气溶胶单一强迫模拟试验中,东亚和南亚地区气溶胶排放反向变化的情况下,北太平洋海表面温度变化主要表现为变暖的响应特征。而单一区域试验结果表明东亚减排与南亚增排会造成北太平洋截然不同的海温响应,东亚减排造成北太平洋高纬度地区以及北美西海岸的增暖,而南亚增排则导致了相应区域的冷却。进一步研究表明,东亚减排通过影响短波辐射以及中纬度的大气遥相关过程,导致北太平洋海表面温度变暖;而南亚增排则通过辐射冷却效应引起北印度洋的大气环流异常,进而导致赤道东印度洋海表面温度冷却,并通过减弱沃克环流产生向北传播的大气遥相关波列响应,将热带的信号传播到北太平洋,并通过引起大气环流的变化进而导致北太平洋海表面温度异常。此外,通过对比人为气溶胶单一强迫模拟试验与单一区域气溶胶强迫试验的结果发现,亚洲偶极子型气溶胶排放特征下的北太平洋海表面温度响应很大程度上由东亚地区人为气溶胶的减排造成的气候响应主导。

    Abstract:

    Using anthropogenic aerosol single-forcing simulations from the Coupled Model Intercomparison Project Phase 6 and East/South Asia regional anthropogenic aerosol forcing simulations from the Regional Aerosol Model Intercomparison Project, we investigate the impacts of the Asian dipole pattern of anthropogenic aerosol emissions, characterized by "East Asian emission reduction and South Asian emission increase" since the 2010s, on the North Pacific sea surface temperature (SST) and its underlying mechanisms. Results show that under the anthropogenic aerosol single-forcing simulations with opposite aerosol emissions changes between East and South Asia, the North Pacific SST shows a warming trend. However, the regional simulations reveal the distinct North Pacific SST responses to East Asian emissions reduction versus South Asian emissions increase: East Asian emissions reduction induces the SST warming in the high-latitude North Pacific and the west coast of North America, whereas South Asian emissions increase leads to the SST cooling in the corresponding regions. Further analyses indicate that the East Asian emissions reduction induces the North Pacific SST warming by modulating the shortwave radiation and the corresponding mid-latitude atmospheric teleconnection, while the South Asian emissions increase triggers the atmospheric circulation anomalies over the North Indian Ocean via radiative cooling effect, subsequently causing the SST cooling in the equatorial eastern Indian Ocean. This SST cooling weakens the Walker circulation and generates a northward-propagating atmospheric teleconnection wave train that propagates the tropical signals to the North Pacific. Then it modifies the North Pacific SST by altering the localized atmospheric circulation. Additionally, by comparing the results between the anthropogenic aerosol single-forcing simulations and those from the regional anthropogenic aerosol forcing simulations, we find that the North Pacific SST variations under the Asian dipole pattern of aerosol emissions are dominated by the anthropogenic aerosol emissions reduction from East Asia.

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  • 收稿日期:2026-03-26
  • 最后修改日期:2026-04-15
  • 录用日期:2026-04-20
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