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. 2015 Jul 24;5:12358. doi: 10.1038/srep12358

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Copyright © 2015, Macmillan Publishers Limited

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850 hPa stream function anomaly (shaded; unit: m² s⁻¹) and horizontal wind anomaly (vector; unit: m s⁻¹) during the IPO positive (top) and negative (bottom) phases. Horizontal smoothing is applied to both stream function and horizontal wind so that the spherical harmonic components with wavenumber larger than 11 is filtered out. Figure 4 is generated using NCAR Command Language (NCL) version 6.3.0, open source software free to public, by UCAR/NCAR/CISL/TDD, http://dx.doi.org/10.5065/D6WD3XH5.