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各位好：
非常感謝大家參與上個禮拜的極地對話！
為了繼續培養社群內交流的火花，
第二次的極地對話 (Polar Teatime Seminar) 已安排在 6 月 11 日舉行，請見如下資訊：

時間：6月11日 (三) 15:30-16:30 (UTC+8)
地點：台灣極地研究中心會議室 / 線上參加
會議室位置：中央大學科一館一樓 S105-1 室，就是牆壁上有著北極熊頭的那間
線上參加連結：https://meet.google.com/vfv-opac-vmx

講者：You-Ting Wu（Columbia University）
講題：Stronger Arctic Amplification from Anthropogenic Aerosols Than from Greenhouse Gases
摘要：Arctic amplification (AA), the greater Arctic surface warming compared to the global average, has been widely attributed to increasing concentrations of greenhouse gases (GHG). However,less is known about the impacts of other forcings - notably, anthropogenic aerosols (AER) - and how they may compare to the impacts of GHG. Here we analyze sets of climate model simulations, specifically designed to isolate the AER and GHG effects on global climate. Surprisingly, we find stronger AA produced by AER than by GHG during the 1955–1984 period, when the strongest global AER increases. This stronger AER-induced AA is due to a greater sensitivity of Arctic sea ice, and associated changes in ocean-to-atmosphere heat exchange, to AER forcing. Our findings highlight the asymmetric Arctic climate response to GHG and AER forcings, and show that clean air policies which have reduced aerosol emissions may have exacerbated the Arctic warming over the past few decades.

Plain word summary: The Arctic is warming faster than the rest of the world, a phenomenon known as Arctic amplification (AA). This has often resulted from rising greenhouse gases (GHG). But this study shows that human-made air pollution particles, aerosols (AER), also play a big role. Using climate models, researchers found that during 1955–1984, when the strongest global AER increases, AER actually causes more cooling AA than warming AA induced by GHG. This happened because Arctic sea ice is especially sensitive to aerosols, which in turn affect how heat moves between the ocean and the atmosphere. These results suggest that efforts to reduce air pollution may have unintentionally sped up Arctic warming in recent decades.

本次講者會使用的語言為中文。