The detailed electrical conductivity measure- ment (ECM), trace chemical compositions and microparti- cles concentration analysis are performed for BH8 ice core from the depth of 126.0m to 130.0m at Vostok Station. At...The detailed electrical conductivity measure- ment (ECM), trace chemical compositions and microparti- cles concentration analysis are performed for BH8 ice core from the depth of 126.0m to 130.0m at Vostok Station. At depth 128.7m, a volcanic signal 4726 a B.P. is detected. The volcanic sulphate flux is 95.8 kg·km?2, sulphate peak concen- tration 1352.8 ng·g?1, duration time about 10.1 years, com- parable with some well-known volcanic events. The results indicate that it seems to be a relatively large scale, long last- ing volcanic signal with farther volcanic origin.展开更多
To study the influence of polluted air-mass transport carrying ozone （O3） and black carbon （BC） in the high Himalayas, since March 2006 the Nepal Climate Observatory at Pyramid （NCO-P） GAW-WMO global station （N...To study the influence of polluted air-mass transport carrying ozone （O3） and black carbon （BC） in the high Himalayas, since March 2006 the Nepal Climate Observatory at Pyramid （NCO-P） GAW-WMO global station （Nepal, 5079 m a.s.l.） is operative. During the first 5-year measurements, the O3 and BC concentrations have shown a mean value of 48 ± 12 ppb （± standard deviation） and 208 ± 374 ng/m3, respectively. Both O3 and BC showed well defined seasonal cycles with maxima during pre-monsoon （O3 ： 61.3 ± 7.7 ppbV; BC： 444 ± 433 ng/m3） and minima during the summer monsoon （O3 ： 40.1 ± 12.4 ppbV; BC： 64 ± 101 ng/m3）. The analysis of the days characterised by the presence of a significant BC increase with respect to the typical seasonal cycle identified 156 days affected by ＂acute＂ pollution events, corresponding to 9.1% of the entire data-set. Such events mostly occur in the pre-monsoon period, when the O3 diurnal variability is strongly related to the transport of polluted air-mass rich on BC. On average, these ＂acute＂ pollution events were characterised by dramatic increases of BC （352%） and O3 （29%） levels compared with the remaining days.展开更多
The microparticle concentration in an ice core from coast area, East Antarctica, has been measured by a Coulter counter and optic counting. It is proposed in the present paper that the microparticle concentrations in ...The microparticle concentration in an ice core from coast area, East Antarctica, has been measured by a Coulter counter and optic counting. It is proposed in the present paper that the microparticle concentrations in different areas are different, especially from the coast to the inland in Antarctica. After its comparison with microparticle concentrations from other cores, it is also proposed that there is a lag between the coldest climate (i. e. 18 ka B. P.) and the highest microparticle concentration.展开更多
基金This work was supported by the China Scholarship Council (CSC)the National Natural Science Foundation of China (Grant Nos.40203013 and 4027 1026) the Brazilian National Council for Scien-tifice ind Technological Developnient (CNPq).
文摘The detailed electrical conductivity measure- ment (ECM), trace chemical compositions and microparti- cles concentration analysis are performed for BH8 ice core from the depth of 126.0m to 130.0m at Vostok Station. At depth 128.7m, a volcanic signal 4726 a B.P. is detected. The volcanic sulphate flux is 95.8 kg·km?2, sulphate peak concen- tration 1352.8 ng·g?1, duration time about 10.1 years, com- parable with some well-known volcanic events. The results indicate that it seems to be a relatively large scale, long last- ing volcanic signal with farther volcanic origin.
文摘To study the influence of polluted air-mass transport carrying ozone （O3） and black carbon （BC） in the high Himalayas, since March 2006 the Nepal Climate Observatory at Pyramid （NCO-P） GAW-WMO global station （Nepal, 5079 m a.s.l.） is operative. During the first 5-year measurements, the O3 and BC concentrations have shown a mean value of 48 ± 12 ppb （± standard deviation） and 208 ± 374 ng/m3, respectively. Both O3 and BC showed well defined seasonal cycles with maxima during pre-monsoon （O3 ： 61.3 ± 7.7 ppbV; BC： 444 ± 433 ng/m3） and minima during the summer monsoon （O3 ： 40.1 ± 12.4 ppbV; BC： 64 ± 101 ng/m3）. The analysis of the days characterised by the presence of a significant BC increase with respect to the typical seasonal cycle identified 156 days affected by ＂acute＂ pollution events, corresponding to 9.1% of the entire data-set. Such events mostly occur in the pre-monsoon period, when the O3 diurnal variability is strongly related to the transport of polluted air-mass rich on BC. On average, these ＂acute＂ pollution events were characterised by dramatic increases of BC （352%） and O3 （29%） levels compared with the remaining days.
文摘The microparticle concentration in an ice core from coast area, East Antarctica, has been measured by a Coulter counter and optic counting. It is proposed in the present paper that the microparticle concentrations in different areas are different, especially from the coast to the inland in Antarctica. After its comparison with microparticle concentrations from other cores, it is also proposed that there is a lag between the coldest climate (i. e. 18 ka B. P.) and the highest microparticle concentration.
