Extended Data Fig. 9: Standardized Holocene hydroclimate proxy records from the mid-latitudes (30° N to 50° N).
From: Mid-latitude net precipitation decreased with Arctic warming during the Holocene
a–e, Time-series composites subdivided by dominant proxy types, with the number of contributing records in grey (200-year bins). Shading represents the 95% bootstrapped uncertainty estimate. f, g, Time-series composites by region. Mid-latitude (30° N to 50° N) hydroclimate in (f) North America (180° W to 45° W) and (g) Eurasia (45° W to 180° E) land area. North America was driest in the earliest Holocene (10 ka), with a gradual wetting trend to the present day. The Asian–European hydroclimate records suggest that the driest conditions occurred during the early Holocene (10 ka to 8 ka). The Eurasian region had increasing net precipitation to about 6 ka, then decreasing net precipitation to about 4 ka, followed by increasing net precipitation to the present day. h, Individual hydroclimate records contributing to the mid-latitude (30° N to 50° N) composite (Fig. 3h), illustrating the variability among records across the mid-latitudes. All time series are standardized to have a mean of 0 and a standard deviation of 1 over the 0–10 ka interval. All y-axes are in standard deviation (SD) units.
