摘要
Aerosol samples were collected over 24 and 12 h to represent day/night aerosol characteristics in forest areas at Ya＇an Baima Spring Scenic Area （BM）, Panzhihua Cycas National Nature Reserve （PZ）, Gongga Mountain National Nature Reserve （GG）, and Wolong National Nature Reserve （WL）, during the summers of 2010-2012. Mass and chemical component concentrations, including organic carbon, elemental car- bon, and inorganic ions （F , C1 , NO2-, NO3-, SO42-, C2042-, PO43-, K＋, Na＋, Ca2＋, Mg2＋, and NH4＋）, of PM2.5 aerosols were measured. The average PM2.5 concentrations for 24 h were 72.42, 104.89, 20.55, and 29.19 p,g/m3 at BM, PZ, GG, and WL, respectively. Organic matter accounted for 38.0-49.3%, while ele- mental carbon accounted for 2.0-5.7% of PM2.s mass. The sum concentrations of 5042-, NH4＋, and NO3- accounted for 23.0%, 17.4%, 22.1%, and 30.5% of PM2.s mass at BM, PZ, GG, and WL, respectively. Soil dust was also an important source of PM2.s, accounting for 6.3%, 17.0%, 10.4%, and 19.1% of PM2.s mass at BM, PZ, GG, and WL, respectively. These reconstructed masses accounted for 75.9-102.0% of PM2.5 mass from the four forest areas of SW China.
Aerosol samples were collected over 24 and 12 h to represent day/night aerosol characteristics in forest areas at Ya＇an Baima Spring Scenic Area （BM）, Panzhihua Cycas National Nature Reserve （PZ）, Gongga Mountain National Nature Reserve （GG）, and Wolong National Nature Reserve （WL）, during the summers of 2010-2012. Mass and chemical component concentrations, including organic carbon, elemental car- bon, and inorganic ions （F , C1 , NO2-, NO3-, SO42-, C2042-, PO43-, K＋, Na＋, Ca2＋, Mg2＋, and NH4＋）, of PM2.5 aerosols were measured. The average PM2.5 concentrations for 24 h were 72.42, 104.89, 20.55, and 29.19 p,g/m3 at BM, PZ, GG, and WL, respectively. Organic matter accounted for 38.0-49.3%, while ele- mental carbon accounted for 2.0-5.7% of PM2.s mass. The sum concentrations of 5042-, NH4＋, and NO3- accounted for 23.0%, 17.4%, 22.1%, and 30.5% of PM2.s mass at BM, PZ, GG, and WL, respectively. Soil dust was also an important source of PM2.s, accounting for 6.3%, 17.0%, 10.4%, and 19.1% of PM2.s mass at BM, PZ, GG, and WL, respectively. These reconstructed masses accounted for 75.9-102.0% of PM2.5 mass from the four forest areas of SW China.
基金
supported by the National Natural Science Foundation of China(No.41073101)
the Youth Project of the Education Department of Sichuan Province(No.11ZB065)
