【Title】PROGRESS IN THE STUDY OF NO-3 CONCENTRATIONS RECORDED IN ANTARCTIC ICE SHEETS
【摘要】综述了近年来南极冰盖雪冰中NO -3 浓度的影响因素、NO -3 的来源、沉积后变化及其浓度的时空变化特征的最新研究进展。尽管质子事件、超新星活动、陨石事件、火山喷发和核试验等各种突发事件都可能对南极雪冰中NO -3 浓度产生影响,但综述和模拟结果表明中低纬度对流层闪电和极地平流层来源可能是南极雪冰中NO -3 浓度本底的主要来源。综合研究表明,南极冰盖雪冰中记录的NO-3 浓度可能是其来源、传输路径、沉积过程以及沉积后变化等的综合反映。
【Abstract】In recent years , much attention has focused on the atmospheric nit rogen cycle , the second major biogenic cycle. The study of the remote polar atmospheres may provide new and valuable data for the study of global atmospheric chemistry. Moreover , the chemical analysis of polar snow and ice has proved to be a very powerful tool in investigating polar atmospheric chemistry , In this paper , the latest progress of the possible causes of short term Antarctic NO-3 variations , the possible sources , the post depositional changes and the time and spatial changes of concent rations of NO-3 in the firn and ice of Antarctic ice sheet have been reviewed. The review indicates that although some solar proton event s , galactic supernovae , Tunguska metor , volcanic eruptions and nuclear tests may influence the NO-3 concent rations in the firn and ice of Antarctic ice sheet , the lightening in the t roposphere and the oxidation of N2O in the st ratosphere are the main sources of the background of NO-3 in Antarctic ice sheet . The comprehensive research shows that the NO-3 concent rations recorded in the Antarctic ice sheet may be the result s of the sources , transmission paths , depositional processes and post depositional processes of NO -
3 in Antarctic ice sheet . Therefore , in order to reveal the environmental meaning of NO - 3 recorded in Antarctic ice sheet , great attentions should be given to a synthetical study of the sources , transmission paths ,depositional processes and post depositional processes of NO -3 in Antarctic ice sheet .