Atmosphere teleconnections from abatement of China aerosol emissions exacerbate Northeast Pacific warm blob events

• 成果类型: Article
• 署名作者: Wang, Hai; Zheng, Xiao-Tong; Cai, Wenju; Han, Zi- Wen; Xie, Shang-Ping; Kang, Sarah M.; Geng, Yu-Fan; Liu, Fukai; Wang, Chuan-Yang; Wu, Yue; Xiang, Baoqiang; Zhou, Lei
• 署名单位: Ocean University of China; Laoshan Laboratory; Commonwealth Scientific & Industrial Research Organisation (CSIRO); Centre for Southern Hemisphere Oceans Research; University of California System; University of California San Diego; Scripps Institution of Oceanography; Max Planck Society; National Oceanic Atmospheric Admin (NOAA) - USA; National Center Atmospheric Research (NCAR) - USA; Shanghai Jiao Tong University; Southern Marine Science & Engineering Guangdong Laboratory; Southern Marine Science & Engineering Guangdong Laboratory (Zhuhai)
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-13048
• DOI: 10.1073/pnas.2313797121
• 发表日期: 2024-05-21
• 关键词: sea-surface temperature; anthropogenic aerosols; marine heatwaves; variability; version

摘要

During 2010 to 2020, Northeast Pacific (NEP) sea surface temperature (SST) experienced the warmest decade ever recorded, manifested in several extreme marine heatwaves, referred to as warm blob events, which severely affect marine ecosystems and extreme weather along the west coast of North America. While year - toyear internal climate variability has been suggested as a cause of individual events, the causes of the continuous dramatic NEP SST warming remain elusive. Here, we show that other than the greenhouse gas (GHG) forcing, rapid aerosol abatement in China over the period likely plays an important role. Anomalous tropospheric warming induced by declining aerosols in China generated atmospheric teleconnections from East Asia to the NEP, featuring an intensified and southward - shifted Aleutian Low. The associated atmospheric circulation anomaly weakens the climatological westerlies in the NEP and warms the SST there by suppressing the evaporative cooling. The aerosol - induced mean warming of the NEP SST, along with internal climate variability and the GHG - induced warming, made the warm blob events more frequent and intense during 2010 to 2020. As anthropogenic aerosol emissions continue to decrease, there is likely to be an increase in NEP warm blob events, disproportionately large beyond the direct radiative effects.