Iceberg Lake, Alaska
Reference
Loso, M.G., Anderson, R.S., Anderson, S.P. and Reimer, P.J. 2006. A 1500-year record of temperature and glacial response inferred from varved Iceberg Lake, southcentral Alaska. Quaternary Research 66: 12-24.
Reference
Loso, M.G., Anderson, R.S., Anderson, S.P. and Reimer, P.J. 2006. A 1500-year record of temperature and glacial response inferred from varved Iceberg Lake, southcentral Alaska. Quaternary Research 66: 12-24.
Description
The authors "present a varve thickness chronology from glacier-dammed Iceberg Lake [60°46'N, 142°57'W] in the southern Alaska icefields," where "radiogenic evidence confirms that laminations are annual and record continuous sediment deposition from AD 442 to AD 1998," and where "varve thickness increases in warm summers because of higher melt, runoff, and sediment transport." This work revealed "a clear manifestation of the Medieval Warm Period" between AD 1000 and 1250, the peak warm-season temperature of which ("smoothed with a 40-year lowpass Butterworth filter") was clearly higher than it was at the end of the 20th century.