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. 2020 Jun 13;8(6):nwaa132. doi: 10.1093/nsr/nwaa132

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© The Author(s) 2020. Published by Oxford University Press on behalf of China Science Publishing & Media Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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Figure 2. — Impact of ENSO on O₃ and CO at Mauna Loa Observatory. (a) Springtime (March–April) O₃ anomaly at MLO and Niño 3.4 anomaly of the preceding winter (December–February). Local time 0:00–8:00 data are averaged to represent the ozone level of free tropospheric air. Seasonal variations of MLO O₃ (b) and CO (c) in El Niño and La Niña years (defined by the 10 highest and 10 lowest years in the Niño 3.4 index, respectively). Whiskers in (b) and (c) show the 25–75% data range and bars give the 10th and 90th percentiles.