Climate Proxy comparison with Hallet and Greyling Lake records

Comparison of regional and hemispheric proxy temperature and precipitation records for the last 2 ka. (A) Summer (JJA) temperature based on biogenic-silica (BSi) content at Hallet Lake (McKay et al. 2008). Horizontal line indicates the mean of the last 2 ka. Thin curves are confidence intervals determined as the dynamic RMSEP(boot). (B) Isotope-inferred temperature from Farewell Lake, northwestern Alaska Range (Hu et al. 2001). (C) Varve thickness from Iceberg Lake, eastern Chugach Range (Loso et al. 2006). (D) Multi-proxy Northern Hemisphere temperature reconstruction (Moberg et al. 2005). (E) Dimensionless winter precipitation index (WPindex) determined from BSi-inferred summer temperature and dry-bulk-density-inferred glacier extent at Hallet Lake (this study). (F) Oxygen isotope (δ18O) variations in CaCO3 from Jellybean Lake sediments (Anderson et al. 2005). (G) δ18Ovariations in the Eclipse ice core from Mount Logan (Fisher et al. 2004). (H) Tree-ring inferred Pacific Decadal Oscillation index (PDO) (MacDonald and Case 2005). (I) Dry bulk density (DBD) at Hallet Lake (this study). (J) Lichenometric age ranges for glacial moraines in Hallet and Greyling Lake valleys (this study). Dark shaded intervals are well-constrained periods of expanded mountain glaciers in southern Alaska, poorly-constrained periods are lightly shaded and denoted with a question mark (Wiles et al. 2008). For all records, gray curves are raw time series, and black curves are low-pass filtered series.