Decadal increase in NingalooNiñosince the late 1990s

A decadal increase in the occurrence of Ningaloo Niño events—characterized by anomalously warm ocean conditions along Western Australia's subtropical coast—has been observed since the late 1990s. This trend is linked to a shift toward the negative phase of the Interdecadal Pacific Oscillation (IPO), which sustains positive heat content anomalies and promotes more frequent cyclonic wind patterns, enhancing poleward heat transport via the Leeuwin Current. The study attributes this phenomenon to both natural variability and anthropogenically forced global warming, which amplifies extreme ocean temperatures in the region. Researchers analyzed historical data and climate models to uncover these connections, providing insights into the complex interactions between large-scale climate oscillations and regional ocean dynamics.

Feng, M., Hendon, H. H., Xie, S.-P., Marshall, A. G., Schiller, A., Kosaka, Y., Caputi, N., & Pearce, A. (2015). Decadal increase in NingalooNiñosince the late 1990s. Geophysical Research Letters, 42(1), 104–112. Portico. https://doi.org/10.1002/2014gl062509