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首页> 外文期刊>Atmospheric chemistry and physics >Influence of trans-Pacific pollution transport on acyl peroxy nitrate abundances and speciation at Mount Bachelor Observatory during INTEX-B
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Influence of trans-Pacific pollution transport on acyl peroxy nitrate abundances and speciation at Mount Bachelor Observatory during INTEX-B

机译：在INTEX-B期间，跨太平洋污染迁移对单身山天文台酰基过氧硝酸盐含量和物种的影响

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We present month-long observations of speciated acyl peroxy nitrates (APNs),including PAN, PPN, MPAN, APAN, and the sum of PiBN and PnBN, measured atthe Mount Bachelor Observatory (MBO) as part of the INTEX-B collaborativefield campaign during spring 2006. APN abundances, measured by thermaldissociation-chemical ionization mass spectrometry (TD-CIMS), are discussedin terms of differing contributions from the boundary layer (BL) and thefree troposphere (FT) and in the context of previous APN measurements in theNE Pacific region. PAN mixing ratios range from 11 to 3955 pptv, with a meanvalue of 334 pptv for the full measurement period. PPN is linearlycorrelated with PAN (r2=0.96), with an average abundance of 6.5%relative to PAN; other APNs are generally <1% of PAN. Diurnal cyclesand relationships of APNs with ozone reveal a gradient in hydrocarbonchemistry between the BL and the FT. On average, levels of APNs, ozone andPPN/PAN are substantially higher in FT air relative to BL air, suggestingthat this site is strongly influenced by distant pollution sources. Toestimate the impact of long-range transport of Asian pollution onatmospheric composition at MBO, we perform a detailed analysis utilizingHYSPLIT back trajectories. This analysis suggests that trans-Pacifictransport of Asian pollution leads to substantial increases in APN and ozonemixing ratios at MBO, especially when transport occurs via the freetroposphere. The ensemble of trajectories indicate that Asian-influencedfree tropospheric air was sampled in ~16% of our data and containeda median PAN mixing ratio double that of the full dataset.
机译：我们展示了为期一个月的特定酰基过氧硝酸盐（APNs）观测值，包括PAN，PPN，MPAN，APAN以及PiBN和PnBN的总和，这是在2002年INTEX-B合作现场活动期间在Mount Bachelor天文台（MBO）测量的2006年春季。通过热解离-化学电离质谱（TD-CIMS）测量的APN丰度，根据边界层（BL）和自由对流层（FT）的不同贡献以及以前在NE Pacific中进行的APN测量进行了讨论地区。 PAN混合比的范围为11至3955 pptv，在整个测量期间的平均值为334 pptv。 PPN与PAN线性相关（ r 2 = 0.96），相对于PAN的平均丰度为6.5％;其他APN通常小于PAN的1％。 APNs与臭氧的昼夜循环和关系揭示了BL和FT之间的烃化学梯度。平均而言，相对于BL空气，FT空气中的APNs，臭氧和PPN / PAN含量要高得多，这表明该场所受到遥远污染源的强烈影响。为了估算亚洲污染在MBO的远距离迁移对大气成分的影响，我们利用HYSPLIT回溯轨迹进行了详细分析。该分析表明，亚洲污染的跨太平洋运输导致MBO的APN和臭氧混合比大大增加，特别是当通过自由对流层进行运输时。轨迹的集合表明，在约16％的数据中采样了受亚洲影响的对流层空气，并且其PAN混合比中值是整个数据集的两倍。

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