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Inorganic chlorine partitioning in the summer lower stratosphere: Modeled and measured ClONO2/HCl during POLARIS

机译:夏季下划线中的无机氯划分:在北极星期间建模和测量Clono2 / HCl

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摘要

We examine inorganic chlorine (Cl_y,) partitioning in the summer lower stratosphere using in situ ER-2 aircraft observations made during the Photochemistry of Ozone Loss in the Arctic Region in Summer (POLARIS) campaign. New steady state and numerical models estimate [ClONO_2]/[HCl] using currently accepted photochemistry. These models are tightly constrained by observations with OH (parameterized as a function of solar zenith angle) substituting for modeled HO_2 chemistry. We find that inorganic chlorine photochemistry alone overestimates observed [ClONO_2]/[HCl] by approximately 55–60% at mid and high latitudes. On the basis of POLARIS studies of the inorganic chlorine budget, [ClO]/[ClONO_2], and an intercomparison with balloon observations, the most direct explanation for the model-measurement discrepancy in Cl_y, partitioning is an error in the reactions, rate constants, and measured species concentrations linking HCl and ClO (simulated [ClO]/[HCl] too high) in combination with a possible systematic error in the ER-2 ClONO_2 measurement (too low). The high precision of our simulation (±15% 1σ for [ClONO_2]/[HCl], which is compared with observations) increases confidence in the observations, photolysis calculations, and laboratory rate constants. These results, along with other findings, should lead to improvements in both the accuracy and precision of stratospheric photochemical models.
机译:我们使用在夏季北极地区臭氧损失光化学过程中进行的原位ER-2飞机观测,研究了夏季低平流层中无机氯(Cl_y)的分配情况。新的稳态和数值模型使用当前公认的光化学方法估算[ClONO_2] / [HCl]。这些模型受到观测值的严格约束,其中用OH(参数化为太阳天顶角的函数)代替了模拟的HO_2化学。我们发现仅无机氯光化学在中高纬度地区高估了[ClONO_2] / [HCl]约55-60%。基于POLARIS对无机氯收支[ClO] / [ClONO_2]的研究,以及与气球观测的比较,对Cl_y中模型测量差异的最直接解释是,分区是反应中的误差,速率常数,以及连接HCl和ClO的物质浓度(模拟的[ClO] / [HCl]太高),以及ER-2 ClONO_2测量中可能的系统误差(太低)。我们仿真的高精度(与观察值相比,[ClONO_2] / [HCl]的±15%1σ)增加了对观察值,光解计算和实验室速率常数的信心。这些结果,以及其他发现,应导致平流层光化学模型的准确性和精密度的提高。

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