|Glacier regression from the Holocene maximum shown for 4 Alaskan glaciers. Total Solar Irradiance shown in orange graph, volcanic activity by black graph.|
Tuesday, October 22, 2013
New paper finds 4 Alaskan glaciers are about the same size as during the Medieval Warm Period
A paper published today in Quaternary Science Reviews reconstructs the size of four glaciers in Alaska over the past 1500-2000 years. For each of the four glaciers, the authors find the termination point at the end of the record in the late 20th century was approximately the same as during the Medieval Warm Period ~1,000 years ago. According to the paper, the data "supports solar irradiance as the primary pacemaker for centennial-scale fluctuations of mid-latitude valley glaciers prior to the 20th century." The authors find all four glaciers advanced during the Little Ice Age, which was the coldest period of the past 10,000 years, and have regressed during the recovery from the LIA to termination points similar to those during the Medieval Warm Period.
Posted by MS at 5:49 PM