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El Niño-Southern Oscillation is the most prominent modulator of atmospheric variability, and the major driver of climate teleconnections worldwide. It is certainly predictable, but state-of-the-art coupled models seem to have reached a plateau at moderate predictability level. Understanding the theoretical nature and activation mechanism of the phenomenon would ultimately enlarge its predictabilit ...

"Although temporal instability of tree-ring/climate relationships is a critical issue with potentially significant implications for the global carbon cycle, forest growth patterns, and climate reconstruction, a greater level of understanding is still needed. Two temporal instabilities identified in Boreal and Iberian forests, termed the “divergence problem” and “climate stress strength”, respectiv ...