New: ARCSS 8k project
Quantitative summer-temperature reconstructions for the last 2000 years based on pollen-stratigraphical data from northern Fennoscandia
bjune, a.e., seppä, h., and birks, h.j.b.
We studied sediments from 11 small lakes located in the middle boreal, northern boreal, low-alpine, or low-arctic zones of northern Norway, northern Sweden, northern Finland, and north-west Russia. The lakes were selected to have as little human influence as possible, and have only small, if any, inflows and outflows.
Pollen stratigraphy :
The temperature reconstructions from our 11 sites indicate similar patterns as those documented by most other proxy data from the region during the last two millennia. In general, a decreasing trend in temperature is inferred during this time period, but with a higher-than-present temperatures between 0 and 1100 AD (2000-850 cal yr BP), and temperatures below the present day between 1100 and 1900 AD (850-50 cal yr BP). There is no indication for a temperature peak during the Medieval Warm Period 900 – 1200 AD (1050–750 cal yr BP), whereas the cooler period between 1200 and 1900 AD (750-50 cal yr BP) corresponds in general with the ‘Little Ice Age’.