| Summary: | One of the most important areas in climatology today is the development of climate models. To evaluate how well a particular climate model is working it is compared with climate reconstructions based on proxy-data, which is indirect climate information that can be obtained from climate archives. The aim of this study is to investigate the ability of climate models to recreate the climate in the North Atlantic region during the last millennium and investigate which external forcings and internal variability in the climate system that have contributed to climate change. As reference periods the well-documented climate periods the Medieval Warm Period (~900-1250) and the Little Ice Age (~1450-1850) are used. This study compares climate model run mil0010 by Jungclaus et al. (2010) with tree ring data from 8 different sites in central and northern Europe by Wilson et al. (2016) and δ18O-data from the icecores DYE3, GRIP and Crete from Greenland by Vinther et al. (2010). The climate model run mil0010 by Jungclaus et al. (2010) shows low correlations with all proxy-data. Hence it would be interestening to compare the proxy-data with other model runs made by Jungclaus et al. (2010). The data from Greenland shows a warmer climate during the Medieval Warm Period, but a less well-defined Little Ice Age. The data from Europe shows a warmer climate during the Medieval Warm Period and a more distinguished Little Ice Age compared to Greenland. Ett av de viktigaste områdena inom klimatologi idag är utvecklingen av klimatmodeller. För att utvärdera hur bra en viss klimatmodell fungerar utförs jämförelser med klimatrekonstruktioner baserade på proxy-data, vilket är indirekt klimatinformation som kan fås från klimatarkiv. Syftet med denna studie är att undersöka klimatmodellers förmåga att återskapa klimatet i Nordatlanten-regionen under det senaste årtusendet och undersöka vilka externa påverkansfaktorer och intern samverkan i klimatsystemet som kan ha gett upphov till klimatförändringarna. Som tydliga referensperioder används ...
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