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Observations of gas phase hydrochloric acid in the polluted marine boundary layer

机译:污染海洋边界层中气相盐酸的观测

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Ship-based measurements of gas phase hydrochloric acid (HCl), particulate chloride (pCl-), and reactive nitrogen oxides (NOy) were made in the polluted marine boundary layer along the California coastline during spring 2010. These observations are used to assess both the rate of Cl atom production from HCl and the role of direct HCl emissions and subsequent partitioning as a source for pCl-. Observations of HCl made in coastal Southern California are broadly correlated with NOz (NOzNOy - NOx), peaking at 11 A.M. The observed median HCl mixing ratio in Southern California is 1.3 ppb (interquartile range: 0.53-2.7 ppb), as compared to 0.19 ppb (interquartile range: 0.10-0.38 ppb) measured along the Sacramento River between San Francisco and Sacramento. Concurrent measurements of aerosol ion chemistry indicate that aerosol particles sampled in Northern California are heavily depleted in Cl-, corresponding to a mean pCl- deficit of 0.05 +/- 0.03 (1 sigma) ppb for sub-10 mu m aerosol particles. In comparison, aerosols measured in Southern California indicate that over 25 of particles showed an addition of Cl- to the particle population. Observations presented here suggest that primary sources of HCl, or gas phase chlorine precursors to HCl, are likely underestimated in the California Air Resource Board emissions inventory. These results highlight the need for future field observations designed to better constrain direct reactive halogen emissions.
机译:2010 年春季,在加利福尼亚海岸线沿线受污染的海洋边界层中进行了气相盐酸 (HCl)、颗粒氯化物 (pCl-) 和活性氮氧化物 (NOy) 的船基测量。这些观察结果用于评估 HCl 产生 Cl 原子的速率以及直接 HCl 排放和随后作为 pCl- 来源的分配的作用。在南加州沿海地区对HCl的观测与NOz(NOzNOy - NOx)广泛相关,在上午11点达到峰值。在南加州观察到的HCl混合比中位数为1.3 ppb(四分位距:0.53-2.7 ppb),而在旧金山和萨克拉门托之间的萨克拉门托河沿岸测量的HCl混合比中位数为0.19 ppb(四分位距:0.10-0.38 ppb)。同时对气溶胶离子化学的测量表明,在北加州采样的气溶胶颗粒的Cl-严重耗尽,对应于低于10μm气溶胶颗粒的平均pCl-赤字为0.05 +/- 0.03(1 sigma)ppb。相比之下,在南加州测量的气溶胶表明,超过25%的颗粒显示出Cl-添加到颗粒群中。这里提出的观察结果表明,在加州空气资源委员会的排放清单中,HCl或HCl的气相氯前体的主要来源可能被低估了。这些结果凸显了未来进行现场观测的必要性,旨在更好地限制直接反应卤素排放。

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