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• W2034220387 endingPage "599" @default.
• W2034220387 startingPage "587" @default.
• W2034220387 abstract "Geological evidence points to a global Younger Dryas (YD) climatic oscillation during the last glacial/ present interglacial transition phase. A convincing mechanism to explain this global YD climatic oscillation is not yet available. Nevertheless, a profound understanding of the mechanism behind the YD climate would lead to a better understanding of climate variability. Therefore, the Hamburg atmospheric circulation model was used to perform four numerical experiments on the YD climate. The objective of this study is to improve the understanding of different forcings influencing climate during the last glacial/interglacial transition and to investigate to what extent the model response agrees with global geological evidence of YD climate change. The following boundary conditions were altered: sea surface conditions, ice sheets, insolation and atmospheric CO2 concentration. Sea surface temperatures based on foraminiferal assemblages proved to produce insufficient winter cooling in the N Atlantic Ocean in two experiments. It is proposed that this discrepancy is caused by uncertainties in the reconstruction method of sea surface temperatures. Therefore, a model-derived set of Atlantic surface ocean conditions was prescribed in a subsequent simulation. However, the latter set represented an Atlantic Ocean without a thermohaline circulation, which is not in agreement with evidence from ocean cores. The global response to the boundary conditions was analysed using three variables, namely surface temperature, zonal wind speed and precipitation. The statistical significance of the changes was tested with a two-tailed t-test. Moreover, the significant responses to cooled oceans were compared with geological evidence of a YD oscillation. This comparison revealed a good match in Europe, Greenland, Atlantic Canada and the N Pacific region, explaining the YD oscillation in these regions as a response to cooled N Atlantic and N Pacific Oceans. However, the results leave the YD climate in other regions completely unexplained. This reflects either an insufficient set of boundary conditions or the important role played by feedbacks within the coupled atmosphere-ocean-ice system. These feedbacks are poorly represented in the used atmospheric model, since ice sheets and the ocean surface conditions have to be prescribed." @default.
• W2034220387 created "2016-06-24" @default.
• W2034220387 creator A5035256951 @default.
• W2034220387 date "1997-08-22" @default.
• W2034220387 modified "2023-10-11" @default.
• W2034220387 title "The global response to Younger Dryas boundary conditions in an AGCM simulation" @default.
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• W2034220387 doi "https://doi.org/10.1007/s003820050184" @default.
• W2034220387 hasPublicationYear "1997" @default.
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