论文部分内容阅读
利用1996年中国南极考察期间在东南极冰盖Princess Elizabeth地区钻取的冰芯(DT001),对1745-1996年冰芯δ18O和海盐气溶胶离子变化进行了分析研究,研究表明可以用主要化学离子的经验正交函数分析的第一特征向量(EOF1)代表海盐气溶胶传输强度,是南印度洋准稳态低压带平均海面气压(SLP)的代用指标;δ18O则反映该低压带中海表气温(SST)的变化;冰芯近20年的记录反映了SSsT和SLP的4次连续波列,分别对应于NCEP/NCAR资料再现的4列“南极绕极波”(ACW),且冰芯中SST和SLP代用指标间存在的1-2年位相差也与ACW中SST和SLP间的位相差一致.NCEP/NCAR再分析资料和DT001冰芯记录表明1958-1980年间没有连续和显著的ACW信号.DT001冰芯过去252年长期记录中SST与SLP之间没有1年的位相差关系,不具备ACW基本特征,从而反证了南印度洋没有ACW 的长期连续信号,1980s后的ACW极可能是ACW启动区发生气候转型后新出现的气候波类型.但从Na+与δ18O十年平均变化和位相关系看,极可能还存在周期约21年的年代际气候振荡.
Using the ice core (DT001) drilled during the 1996 Antarctic Expedition in China in the area of Princess Elizabeth, the changes of ice core δ18O and sea salt aerosols in 1745-1996 were analyzed. The results show that the main chemical ions The first eigenvector (EOF1) of the empirical orthogonal function analysis represents the seawater aerosol transmission intensity, which is a surrogate indicator of the mean sea surface pressure (SLP) of the quasi-steady-state low-pressure zone in the South Indian Ocean. The δ18O reflects the sea surface air temperature ). The records of ice core nearly 20 years reflect four continuous wave trains of SSsT and SLP, which correspond to 4 columns of ACW reproduced by NCEP / NCAR data respectively, The 1-year and 2-year phase differences between the SST and SLP surrogates are also consistent with those of the ACW SST and SLP. The NCEP / NCAR reanalysis data and DT001 ice core records show that there was no continuous and significant ACW signal between 1958 and 1980 .DT001 Ice core Long-term records over the past 252 years there is no one-year gap between SST and SLP, does not have the basic characteristics of ACW, thus reversing the South Indian Ocean without ACW long-term continuous signal ACW after 1980s most likely ACW start District climate change after the new The wave climate type. However, Na + δ18O years and the average change in phase relationship with the look, most likely there is a period of about 21 years of decadal climate oscillations.