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利用2002年中国南极考察期间在东南极冰盖Princess Elizabeth地区钻取的LGB69冰芯,对其海盐离子与大气环流的关系进行了分析.结果表明:冰芯主要化学离子的经验正交函数(EOF)分解的第一特征向量(EOF1)可以作为描述海盐气溶胶的传输强度的代用指标,可用于表征南印度洋准定常低压带海平面气压(SLP)的变化.冰芯最近23 a(1979-2001年)的记录与SLP和低层风场的相关模态反映了海平面气压场准半年振荡(SAO)和南极大陆边缘下降风的季节特征.LGB69冰芯很好地记录了1708-2001年间南半球环状模(SAM)的变化特征,Na+时间序列呈现的3.5 a周期变化与SAM的周期变化具有很好地一致性.在1970年SAM转为正位相后,其与Na+的相关关系也由负相关转为正相关.LGB69冰芯的海盐离子可以作为重建过去近300 a海平面气压场和SAM变化的代用指标.
Using the LGB69 ice core drilled in the East Elizabeth polar region during the Chinese Antarctic Expedition in 2002, the relationship between sea salt ions and the atmospheric circulation was analyzed. The results show that the empirical orthogonal function (EOF (EOF1) can be used as a proxy for the transmission intensity of sea-salt aerosols and can be used to characterize the SLP over the South Indian Ocean in the recent 23 years (1979-2001) Year) and SLP and lower-level wind fields reflect seasonal characteristics of quasi-semi-annual oscillations of the sea level pressure field (SAO) and descending wind over the Antarctic continent.LGB69 ice core well records the distribution of the southern hemisphere ring during 1708-2001 (SAM). The variation of 3.5 a cycle presented by Na + time series is in good agreement with the periodic change of SAM. The correlation between SAM and Na + was also negatively correlated by SAM in 1970 And the sea salt ions in LGB69 ice core can be used as surrogate markers to reconstruct the sea level pressure field and SAM change over the past 300 years.