| 北京上甸子区域大气本底站HCFC-22在线观测研究 |
| 摘要点击 1881 全文点击 1722 投稿时间：2009-10-14 修订日期：2009-11-23 |
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| 中文关键词 上甸子区域大气本底站 HCFC-22 在线观测 浓度 污染源和输送 |
| 英文关键词 Shangdianzi GAW regional station HCFC-22 in situ measurement mixing ratio emission and air mass transport |
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| 中文摘要 |
| 2007年4月～2008年3月，利用GC-ECD在线观测系统，在北京上甸子区域大气本底站开展了HCFC-22在线观测，讨论了北京上甸子站HCFC-22浓度水平并初步分析其影响因素.该站大气HCFC-22浓度（摩尔分数，下同）为（278.1±113.6）×10-12.利用逐步逼近回归法进行本底值筛分，本底浓度为（199.5±5.1）×10-12，与北半球同纬度带Mace Head和Trinidad Head本底站观测结果基本一致；非本底浓度为（312.1±121.0）×10-12，出现频率69.8%，表明该站受到较强HCFC-22排放源及输送的影响.上甸子站HCFC-22本底浓度季节变化不明显，但非本底浓度呈现夏高冬低的特点，平均非本底浓度最高月（7月）比最低月（1月）高100.9×10-12，与HCFC-22排放的季节性有关.结合风向分析，该站西南扇区平均浓度（327.3×10-12）比东北扇区（236.2×10-12）高91.1×10-12.HCFC-22高浓度水平主要由W-WSW-SW方向贡献引起，NNE-N-NE方向则使得全年HCFC-22浓度水平明显降低. |
| 英文摘要 |
| An in situ GC-ECD monitoring system was established at the Shangdianzi GAW Regional station from April 2007 to March 2008, and the mixing ratio of atmospheric HCFC-22 was (278.1±113.6)×10-12 (mol/mol). A “R” statistical software was applied to the HCFC-22 time series to separate background and pollution data. The background HCFC-22 mixing ratio was (199.5±5.1)×10-12, close to northern hemisphere background level observed at Mace Head and Trinidad Head stations. The pollution HCFC-22 mixing ratio was (312.1±121.0)×10-12 due to anthropogenic emission from various regions and air mass transport. There was no significant seasonal variability of background data. However, pollution data was much higher in summer than that in winter, and elevated up to 100.9×10-12 in July than in January attribute to seasonal emission characteristics. The mean HCFC-22 mixing ratio from southwest wind sector (327.3×10-12) was much higher than that of northeast sector (236.2×10-12). The W-WSW-SW wind sector has a positive contribution to the HCFC-22 level, while NNE-N-NE has a large negative contribution. |
