Disentangling the Evidence of Milankovitch Forcing From Tree-Ring and Sedimentary Records

Tree-ring records constitute excellent high-resolution data and provide valuable information for climate science paleoclimatology. reconstructions of past temperature variations agree to show evidence annual-to-centennial anomalies in place the industrial-era warming context late Holocene patterns regimes. Despite their wide use paleoclimate research, however, tree rings have also been deemed unsuitable as low-frequency indicators climate. The arising debate concerns whether millennia-long tree-ring signals orbital forcing due Milankovitch cycles. Here, we produce a summer-temperature reconstruction from chronology running through mid- late-Holocene times (since 5486 BCE) comprising minimum blue channel light intensity (BI). BI correlates with existing new chronologies built maximum latewood density (MXD) and, unlike MXD data, shows trends on scales comparable various types sedimentary proxy across circumpolar Arctic. Our results demonstrate an unrevealed potential novel, unconventional variables contribute geoscience research by capability estimates inter-annual up those relevant forcing.