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根据冰芯化学记录重建大气环流历史,需要认识雪冰化学成分的控制因子,诸如其来源、大气传输途径及强度.为了解这些过程,研究了北半球两支冰芯化学记录(加拿大育空地区洛根山冰芯和格陵兰南部20D冰芯)与北半球海平面气压(SLP)的相互关系.结果表明,洛根山冰芯中ssNa+浓度与秋季阿留申低压和夏季北太平洋副热带高压关系密切.秋季阿留申低压的加深和夏季北太平洋副热带高压增强都有利于海盐气溶胶从北太平洋向育空地区传输.20 D冰芯中ssNa+浓度与冬季冰岛低压密切相关.加深的冰岛低压加强了北大西洋冬季风暴和气旋的生成,为格陵兰冰盖输送了更多的海盐气溶胶.因此,洛根山冰芯ssNa+记录可以作为重建秋季阿留申低压和夏季北太平洋副热带高压的指标,而20 D冰芯ssNa+记录可作为重建冬季冰岛低压的指标.
To reconstruct the general circulation history based on ice core chemistry records, it is necessary to know the chemical composition of snow ice, such as its source, atmospheric transport pathways and intensity.In order to understand these processes, two ice cores chemical records in Northern Hemisphere The results show that the concentration of ssNa + in the ice core of Mount Logan is closely related to the autumn Aleutian low and summer subtropical high in the North Pacific. The autumn Aleutian low pressure Deepening and summer North Pacific subtropical high enhancement are conducive to the transfer of sea salt aerosols from the North Pacific to the Yukon region.The concentration of ssNa + in the ice core 20D is closely related to the winter low pressure in Iceland.The deepening Icelandic low pressure intensifies the winter storm and cyclone over the North Atlantic , And more sea salt aerosols were transported to the Greenland ice sheet. Therefore, the Logan ice core ssNa + record can be used as an indicator for reconstructing the autumn Aleutian low and the summer North Pacific subtropical high, whereas the 20 D ice core ssNa + record can be used as a reconstruction Winter Iceland low pressure indicators.