Increased Indian Ocean-North Atlantic Ocean warming chain under greenhouse warming

Young-Min Yang, Jae-Heung Park, Soon-Il An (), Sang-Wook Yeh, Zhiwei Zhu, Fei Liu, Juan Li, June-Yi Lee and Bin Wang
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Young-Min Yang: Nanjing University of Information Science and Technology
Jae-Heung Park: Pohang University of Science and Technology
Soon-Il An: Pohang University of Science and Technology
Sang-Wook Yeh: Hanyang University, ERICA
Zhiwei Zhu: Nanjing University of Information Science and Technology
Fei Liu: School of Atmospheric Sciences Sun Yat-Sen University, Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education, and Southern Marine Science and Engineering Guangdong Laboratory
Juan Li: Nanjing University of Information Science and Technology
June-Yi Lee: Pusan National University
Bin Wang: Nanjing University of Information Science and Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Over the past half a century, both the Indian Ocean (IO) and the North Atlantic Ocean (NA) exhibit strong warming trends like a global mean surface temperature (SST). Here, we show that not only simply as a result of increased greenhouse gases, but the IO-NA interaction through atmospheric teleconnection boosts up their warming trends. Climate model simulations demonstrate that the IO warming increases the NA SST by enhancing the longwave radiation through atmospheric teleconnection, subsequently, the warmer NA SST-induced atmospheric teleconnection leads to IO warming by reducing evaporative cooling with weakened surface winds. This two-way interaction (i.e., IO-NA warming chain) acts as positive feedback that reinforces warming over both ocean basins. The Pacific Ocean is partly involved in this warming chain as a modulator in an interdecadal timescale. These results highlight the importance of understanding ocean-basin interactions that may provide a more accurate future projection of warming.

Date: 2022
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DOI: 10.1038/s41467-022-31676-8

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