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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Inorganic chlorine partitioning in the summer lower stratosphere: Modeled and measured [ClONO2]/[HCl] during POLARIS
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Inorganic chlorine partitioning in the summer lower stratosphere: Modeled and measured [ClONO2]/[HCl] during POLARIS

机译：夏季低平流层中无机氯的分配：POLARIS期间模拟和测量的[ClONO2] / [HCl]

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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 [ClONO2]/[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 HO2 chemistry. We find that inorganic chlorine photochemistry alone overestimates observed [ClONO2]/[HCl] by approximately 55-60% at mid and high latitudes. On the basis of POLARIS studies of the inorganic chlorine budget, [ClO]/[ClONO2], 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 ClONO2 measurement (too low). The high precision of our simulation (+/-15% 1 sigma for [ClONO2]/[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. [References: 51]
机译：我们使用在夏季北极地区臭氧流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[ClONO2] / [HCl]。这些模型受到观测值的严格限制，用OH（作为太阳天顶角的函数进行参数化）代替了模拟的HO2化学。我们发现，仅无机氯光化学在中高纬度地区高估了[ClONO2] / [HCl]约55-60％。根据POLARIS对无机氯预算[ClO] / [ClONO2]的研究，以及与气球观测结果的比较，对Cl-y分配中模型测量差异的最直接解释是反应，速率和误差常数，以及连接HCl和ClO的测量物质浓度（模拟[ClO] / [HCl]太高），以及ER-2 ClONO2测量中可能的系统误差（太低）。我们仿真的高精度（与观测值相比，[ClONO2] / [HCl]的+/- 15％1 sigma）增加了对观测值，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。 [参考：51]

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