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关于格陵兰-苏格兰海脊溢流水的动力机制,历来有“斜压密度流”和“正压效应”两种不同的观点,在全球变暖的背景下,作为热盐环流(THC)重要组成部分的格陵兰-苏格兰海脊溢流水变化的动力机制是非常值得探讨的科学问题.基于德国Max-Planck气象研究所的大气海洋环流模式ECHAM5/MPI-OM,耦合海冰和陆面过程模式,分别设计了CO2浓度固定在1860年工业化以前的水平——280ppmv的控制试验以及针对IPCC排放情景特别报告的3种不同温室气体排放假设(B1,A1B,A2)的预测试验,研究不同CO2浓度背景下格陵兰-苏格兰海脊溢流水变化的动力机制.在控制试验中,当法鲁海峡的高盐入流水增强时,格陵兰-冰岛-挪威海(GIN)海域的正压出流效应增强,同时高盐入流水的增加使得斜压效应导致的溢流水强度也增强,因此,影响溢流水强度的斜压效应和正压效应二者是统一的;而在CO2浓度增加的背景下,法鲁海峡溢流水强度的变化由斜压效应控制,丹麦海峡溢流水的增强则是正压效应的结果.
With regard to the dynamic mechanism of the Greenland-Scottish ridge overflow water, there are two different viewpoints of “baroclinic flow” and “positive pressure effect”. In the context of global warming, as the thermohaline circulation (THC ) An important component of the dynamic mechanism of the Greenland-Scottish spillway overflow water change is a very scientific issue to be studied.Based on the atmospheric ocean circulation model ECHAM5 / MPI-OM at the Max-Planck Institute for Meteorology in Germany, coupled with sea ice and land surface processes Model, the control experiments of CO2 concentration fixed at pre-industrial level of 1860 - 280 ppmv and the prediction experiment of three different greenhouse gas emission assumptions (B1, A1B, A2) specially reported in the IPCC emission scenarios were designed respectively to study the effects of different CO2 In the control experiment, the effect of positive pressure outflow in Greenland-Iceland-Norway Sea (GIN) area is enhanced when the salt inflow in the Faroe Strait is enhanced, At the same time, the increase of inflow salt water resulted in the increase of overflow pressure caused by baroclinic effect. Therefore, both the baroclinic effect and the positive pressure effect that affect the strength of overflowed water were uniform. However, Changes in the intensity of Falu Hai Gap water overflow from the baroclinic effect control, the Denmark Strait overflow water enhancement is the result of positive effects.