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. 2022 Oct 27;12:18025. doi: 10.1038/s41598-022-22628-9

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© The Author(s) 2022

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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SVD mode 1 and mode 2 of geopotential height at 250 hPa (GPH250) and heatwave days (HWD). (a)–(c) First and (d)–(f) second coupled modes of SVD. From July to August, the coupled patterns of (a and d) GPH250 and (b and e) HWD in East Asia. (c and f) The standardized time series of the SVD time coefficients (TC) for GPH250 (blue line) and HWD (red line). The black dashed line in (c) indicates the AMO index.