Secondly, a significant increase of roughly a factor 3 is found in the Mediterranean W–E oxygen isotope gradient during the Last Glacial Maximum, relative to the Present.This difference is almost entirely due to increased glacial values in the Levantine Sea, which are considered to be a result of a combination of increased evaporation rates and/or somewhat cooler than anticipated surface water conditions.The method has been applied to a large series of AMS datings on lime mortar from three medieval churches on the Åland Islands, Finland.The datings show convincing internal consistency and confine the construction time of the churches to AD 1280–1380 with a most probable date just before AD 1300.
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Firstly, it is concluded that any reconstruction should strictly be based on values obtained by analyses of one single foraminiferal species throughout the basin, as different species are found to respond with isotopic variations of different amplitudes to climatic/hydrographic change.
This difference is tentatively related to differences between the habitats and seasons of growth of the various species.