气候变化领域集成服务门户

Carbonaceous particles concentrations of OC and EC are determined using a two-step gas chromatography system in Muztagh Ata ice core covering the time period of 1955-2000. Over the period represented by the core, OC and EC concentrations appear to have changed significantly, varied in the range of 17.7-216.7 and 6.5-124.6, and averaged 61.8, 32.9 ng center dot g(-1), respectively. The average concentration of EC in Muztagh Ata ice core is much lower than that in an Alpine ice core record (100-300 ng center dot g(-1)) during the same period, but it is a factor of 14 in Greenland ice core (2.3 ng center dot g(-1)), this may induce a strong impact on the snow albedo in the last 46 years in our study area. Observations indicate two periods with obviously high deposition concentrations (1955-1965 and 1974-1989) and two periods with low concentrations (1966-1973 and 1990-1995), as well as a recent increasing trend. By comparing EC and SO42- concentration variations and deciphering OC/EC ratios recorded in the same ice core, we can judge roughly that the carbonaceous particles deposited in Muztagh Ata ice core were attributed to fossil fuel combustion sources.