摘要
1997年5月中美联合珠峰地区绒布冰川考察期间,在远东绒布冰川海拔6500m北支冰流粒雪盆内钻取到一支41m长冰芯.该冰芯定年至1814年.远东绒布冰芯中近200年来草酸根浓度变化与Ca2+和NH4浓度变化一致性较差,表明草酸根的来源有别于大气尘埃和生物来源.草酸根浓度与冰芯中气温指标δ18O的变化具有一致性,说明气温是影响大气中草酸根浓度变化的因素之一,但非主导因素.远东绒布冰芯记录的20世纪以来草酸根浓度的迅速升高反映了人类工业活动对大气环境的污染.20世纪50~80年代,大气中受人类工业活动污染的草酸根浓度约为19世纪自然本底值的3倍,其中60年代人类活动排放的草酸盐类对大气的污染最为严重.
During the Sino-American expedition to Rongbuk Glacier of Mt.Qomolangma Region in May 1997, a 41m ice core was got from an elevation of 6500m in the northern branch firn basin of the Far East Rongbuk Glacier, which was dated down to 1814. Variations of the C2O concentration of the ice core in recent 200 years are less agreeable to those of Ca2+ and NH concentration, indicating that the source of C2O4 is differnt from atmospheric dust and biomass source.Variations of the C2O4 concentration is consisten with those of temperature proxy δ 18O in the ice core,which shows that the temperature is one of the factors influencing variations of the C2O4 concentration, but not the dominant one.Abrupt increasing of the C2O4 concentration in the ice core records of the Far East Rongbuk Glacier since the 20th century reflects atmospheric environmental pollution by human industrial activities. In 1950~1980 it is about 3 times than that of nutural C2O4 background concentration in the 19th century; and the atmospheric environmental pollution from human industrial discharge of C2O4 was more serious in 1960's.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
2000年第3期203-206,共4页
China Environmental Science
基金
国家攀登计划项目!95-预-40和95-预-24
中国科学院重大项目!KZ951-A1-402和KZ951-A1-204
国家自然科学基金!49871022
中国科学院兰州冰
关键词
珠穆朗玛峰地区
冰芯草酸根
浓度记录
环境意义
Mount Qomolangma region
ice core records of C_2O_4^(2-) concentration
environmental significance