Episodic slowdown of global warming by a multi-year La Niña
複数年にわたるラニーニャ現象による地球温暖化の一時的な減速 (AI 翻訳)
Iwakiri, Tomoki, Kohyama, Tsubasa
🤖 gxceed AI 要約
日本語
本研究は、複数年にわたるラニーニャ現象が全球平均気温（GMST）の上昇を一時的に停滞させる効果を、観測と気候モデルを用いて明らかにした。特に2年目のラニーニャでは、振幅が弱くとも冷却効果が強く、熱帯全体の気温低下が持続する。抵抗-容量（RC）フレームワークを用いて、この現象が気候システムの過渡応答と海洋混合層の熱容量に起因することを示した。
English
This study reveals that multi-year La Niña events can cause a temporary slowdown of global warming by cooling the pantropical climate, based on observations and climate model simulations. The cooling effect is stronger in the second year despite weaker amplitude, explained by the climate system's transient sensitivity and ocean heat capacity using an RC framework.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本のGX政策や企業の気候変動対策に直接関連する内容ではないが、気候変動の自然変動要因を理解する上で基礎的な知見を提供する。
In the global GX context
This paper contributes to understanding natural climate variability that can temporarily mask or amplify anthropogenic warming, relevant for interpreting near-term climate trends and adaptation planning.
👥 読者別の含意
🔬研究者:Climate scientists studying ENSO teleconnections and global temperature variability will find the RC framework a useful pedagogical tool.
📄 Abstract（原文）
Global mean surface temperature (GMST), which has continued to rise due to the anthropogenic greenhouse gas forcing, is closely related to the sea surface temperature variability in the tropical Pacific. In particular, GMST is known to increase during a strong and short-lived El Niño. By contrast, the global cooling effect of a weak and long-lived La Niña remains underexplored, particularly that of multi-year La Niña. This study shows that multi-year La Niña events tend to have a strong cooling effect on GMST based on observations and climate model simulations. The minimum of GMST around the second-year La Niña becomes larger despite the comparable or weaker amplitude of La Niña. The persistent La Niña cools the pantropical climate, causing a temporary GMST warming stagnancy, whereas the cooling effect of a single-year La Niña is weaker due to the lagged response of other tropical basins and its transience. Yet, even during so-called triple-dip or longer events, global cooling can persist despite the modest La Niña forcing, because the pan-tropical climate has already been cooled. Applying the resistor–capacitor (RC)-framework analogy, we demonstrate that the lagged decreases in GMST and its lower bound during multi-year La Niña episodes arise naturally from the climate system’s intrinsic transient sensitivity and the heat capacity of the ocean mixed layer. The RC framework would offer a simple, intuitive, and pedagogically useful tool for interpreting the GMST response to ENSO.
🔗 Provenance — このレコードを発見したソース
- EarthArXiv https://eartharxiv.org/repository/object/13004/download/23057/first seen 2026-05-14 21:17:07
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