Uptake of nitrate and sulfate on dust aerosols during TRACE‐P
Uptake of nitrate and sulfate on dust aerosols during TRACE‐P
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DOI：
10.1029/2002jd003101
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发表时间：
2003-11
影响因子：
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通讯作者：
C. Jordan;J. Dibb;B. Anderson;H. Fuelberg
中科院分区：
文献类型：
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作者：
C. Jordan;J. Dibb;B. Anderson;H. Fuelberg
[1]在TRACE-P期间，在亚洲附近的DC-8飞机平台上收集的气溶胶数据已经被检查，以获得灰尘表面吸收NO3−和SO 4 =的证据。数据之间的一个部门，灰尘占主导地位，灰尘的影响较小的一个部门进行比较。与沙尘相一致的是人为污染物的混合比例较高。HNO 3，SO2和CO在粉尘部门比非粉尘部门分别高出2.7，6.2和1.5倍。沙尘和污染源的共存使得NO3−和nss-SO 4 =吸附在粗沙尘气溶胶上，使这些颗粒物的混合比平均增加了5.7和2.6倍。有足够的nss-SO 4 =吸收所有的NH 4+存在，与足够的过量nss-SO 4 =也与粉尘CaCO 3反应。这表明增强的NO3−不是精细模式的NH 4 NO3。颗粒NO3−（p-NO3−）平均占总NO3−（t-NO3−）的54%，在粉尘部门达到最高值72%。在非粉尘部门，p-NO3−占t-NO3−的37%，可能是由于那里有丰富的海盐。在另外两个受灰尘和海盐影响最小的地区，p-NO3−占t-NO3−的比例小于15%。
[1] Aerosol data collected near Asia on the DC-8 aircraft platform during TRACE-P has been examined for evidence of uptake of NO3− and SO4= on dust surfaces. Data is compared between a sector where dust was predominant and a sector where dust was less of an influence. Coincident with dust were higher mixing ratios of anthropogenic pollutants. HNO3, SO2, and CO were higher in the dust sector than the nondust sector by factors of 2.7, 6.2, and 1.5, respectively. The colocation of dust and pollution sources allowed for the uptake of NO3− and nss-SO4= on the coarse dust aerosols, increasing the mixing ratios of these particulates by factors of 5.7 and 2.6 on average. There was sufficient nss-SO4= to take up all of the NH4+ present, with enough excess nss-SO4= to also react with dust CaCO3. This suggests that the enhanced NO3− was not in fine mode NH4NO3. Particulate NO3− (p-NO3−) constituted 54% of the total NO3− (t-NO3−) on average, reaching a maximum of 72% in the dust sector. In the nondust sector, p-NO3− contributed 37% to t-NO3−, likely due to the abundance of sea salts there. In two other sectors where the influence of dust and sea salt were minimal, p-NO3− accounted for <15% of t-NO3−.