喜马拉雅山南坡冬季暴雪对高原南部冰芯中稳定同位素记录的影响

THE EFFECT OF SNOW STORM IN THE SOUTH OF HIMALAYAS ON δ18 O IN ICE CORE RECORD

中文关键词:  稳定同位素  喜马拉雅山南坡  冬季暴雪  冰芯

中文摘要:

      聂拉木气象站降水中δ¹⁸O的变化表明,夏季降水中δ¹⁸O为一低值阶段;冬季降水中δ¹⁸O总的来说为一高值阶段,但冬季暴风雪中δ¹⁸O的值和夏季强的季风活动中降水的δ¹⁸O一样很低.由于该地区冬季降水十分活跃,冬季降水中δ¹⁸O的变化对该地区冰芯记录将产生重要的影响.首先是用δ¹⁸O的季节变化来对冰芯定年产生一定的困难,其次喜马拉雅山中段冰芯中的δ¹⁸O记录不仅包括了夏季季风活动的强弱信息,而且冬季强的暴风雪过程也记录在内.

英文摘要:

      Study on δ¹⁸O in precipitation at Nyalam in the south slope of the Himalayas shows that the δ¹⁸O in winter precipitation in the south of the Himalayasis quite different from that in the north of the Tibet an Plateau.δ¹⁸O in summer is characterized by low value.In winter,δ¹⁸O in precipitation is generally high.However,strong snow storm is characterized by extremely low value of δ¹⁸O in precipitation,which is in the same level as in the summer period.This phenomenon has an obvious effect on the ice core record in the south of the Tibet an Plateau,for the frequent snow storm in the south of Himalayas.On the one hand,the complexity of seasonal variation of δ¹⁸O in precipitation in the south to the Himalayas results in the difficulty of ice core dating in this area.On the other hand,δ¹⁸O in the ice core record in the south of the Tibetan Plateau includes not only the signal of summer monsoon,but also the winter storm.