The phrase "decadal timescale" refers to a period of ten years. It is often used in scientific studies or discussions to analyze changes, patterns, or events that occur over a span of ten years. Full definition
There is a significant anticorrelation between AMOC variations and the meridional shifts of the Gulf Stream path at decadal timescales in both observations and two Earth system models. (usclivar.org)
This analysis shows that on decadal timescales surface flux anomalies over the subpolar North Atlantic have the largest impact on the AMOC; however, on multi-decadal timescales (longer than 20 - 30 years), it is flux anomalies in the Arctic that become more important. (usclivar.org)
Carvalho 2007 shows in a tale of two islands (UK and NZ) that anti persistence is persistent, in both climate records over a couple of centuries and that the reversibility of regimes on decadal timescales when mapped onto random walks meets the Hurst criteria. (judithcurry.com)