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. 2017 Sep 20;7:11987. doi: 10.1038/s41598-017-12278-7

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© The Author(s) 2017

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 license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license 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 license, visit http://creativecommons.org/licenses/by/4.0/.

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Interdecadal variability of SST, UT zonal wind, PV intrusion and Ozone transport. (a) and (b) represent NDJFM mean difference between 1999–2012 and 1985–1998 for SST (K) and U (m s⁻¹, 200 hPa), respectively. (c) Displays PV intrusion frequencies during 1985–1998 (blue) and 1999–2012 (red), as a function of longitude and sum over NDJFM. The maps in the figure are generated using the MATLAB software (Version: R2012b (8.0.0.783) & URL: http://www.mathworks.com/products/matlab/?s_tid=srchtitle).