From the Sellevollmyra bog at Andøya, northern Norway, a 440 cm long peat core covering the last c. 7000 calendar years was examined for humification, loss-on-ignition, pollen and spores, selected protozoa, macrofossils and tephra. The age model was based on a Bayesian wiggle-match of 35 14C-dates and two historically anchored tephra layers. Based on changes in lithology (mainly wet shifts and sedimentation rates) and bio-stratigraphical climate proxies (especially shifts in the local bog vegetation), several climatic changes/deteriorations are identified (periods of the most fundamental changes in italics): 6410-6380, 6230-6050, 5730-5640, 5470-5430, 5340-5310, 5270-5100, 4790-4710, 4890-4820, 4380-4320, 4220-4120, 4000-3810, 3610-3580, 3370-3340, (regionally: 2850-2750; in Sellevollmyra a hiatus between 2960-2520), 2330-2220, 1950, 1530-1450, 1150-840, 730? and c. 600? cal. yr BP. Most of these climate changes are also known from other investigations of different palaeoclimate proxies in northern and middle Europe. The bog surface morphology between c. 6410 and 4790 cal. yr BP was dominated by vegetation characterizing slopes of raised bogs. The cooling periods recorded at Sellevollmyra about 4790 and 4220 to 4170 cal. yr BP led to formation of the modern type of surface morphology of the bog (pools, hollows, string hummocks). It is suggested that the climatic deteriorations between 4220 and 3810 cal. yr BP introduced a climatic regime and regional vegetation similar to that of the present day. There are some time slices where volcanic eruptions seemingly coincide with vegetation changes recorded in the peat, e.g. about 5760 cal. yr BP; however, the known climatic deterioration about the deposition time of the Hekla-4 tephra layer started some decades before the eruption event.
2007. Vol. 36, no 3, 253-277 p.