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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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PV intrusion frequency and Ozone transport during EN and LN. (a) Latitude-longitude section of NDJFM mean (ERA40, ERA interim, NCEP, JRA55 & JRA25) correlation coefficient between PV (200 hpa) and TOMS total columnar ozone density 1983–2012. (b) Represents the longitude-height (10–25°N) section of mean (ERA40, ERA interim, NCEP, JRA55 & JRA25) correlation coefficient between intrusion frequency and AIRS ozone density. (c) Represents the difference in ERA interim PV (PVU, 200 hpa) between El-Nino and La-Nina years and (d) represents the same but for AIRS ozone density (ppbv). The maps in the figure are generated using the MATLAB software (Version: R2012b (8.0.0.783) & http://www.mathworks.com/products/matlab/?s_tid=srchtitle).