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首页> 外文期刊>Atmospheric chemistry and physics >HOCl chemistry in the Antarctic Stratospheric Vortex 2002, as observed with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)
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HOCl chemistry in the Antarctic Stratospheric Vortex 2002, as observed with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS)

机译：用无源大气探测的迈克尔逊干涉仪（MIPAS）观测到的南极平流层涡旋2002中的HOCl化学成分

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In the 2002 Antarctic polar vortex enhanced HOCl mixing ratios weredetected by the Michelson Interferometer for Passive AtmosphericSounding both at altitudes of around 35 km (1000 K potential temperature),where HOCl abundances are ruled by gas phase chemistry and at around 18–24 km(475–625 K), which belongs to the altitudedomain where heterogeneous chlorine chemistry is relevant.At altitudes of 33 to 40 km polar vortex HOCl mixing ratios were found to bearound 0.14 ppbv as long as the polar vortex was intact, centered at the pole,and thus received relatively little sunlight. This is the altitude regionwhere in midlatitudinal and tropic atmospheres peak HOCl mixing ratiossignificantly above 0.2 ppbv (in terms of daily mean values) are observed.After deformation and displacement of the polar vortex in the courseof a major warming, ClO-rich vortex air was more exposed to sunlight,where enhanced HOx abundances led to largely increased HOClmixing ratios (up to 0.3 ppbv), exceeding typical midlatitudinaland tropical amounts significantly. The HOCl increase was preceded by anincrease of ClO. Model runs could reproduce these measurements only when theStimpfle et al. (1979) rate constant for the reaction ClO+HO2→HOCl+O2 was used but not with the current JPL recommendation.At an altitude of 24 km, HOCl mixing ratios of up to 0.15 ppbv were detected.This HOCl enhancement, which is already visible in 18 September data, isattributed to heterogeneous chemistry, which is in agreement with observationsof polar stratospheric clouds. The measurements were compared to a model runwhere no polar stratospheric clouds appeared during the observation period.The fact that HOCl still was produced in the model runsuggests that a significant part of HOCl was generated from ClO rather thandirectly via heterogeneous reaction. Excess ClO, lower ClONO2 andearlier loss of HOCl in the measurements are attributed to ongoingheterogeneous chemistry which is not reproduced by the model.On 11 October, polar vortex mean daytime mixing ratios were only 0.03 ppbv.
机译：在2002年，通过迈克尔逊干涉仪对被动大气进行了探测，发现南极极涡增强了HOCl的混合比，这两个高度都在大约35 km（1000 K的潜在温度）的高度上，其中HOCl的丰度受气相化学法控制，并且在18-24 km左右（475 –625 K），属于与异质氯化学有关的高度域。在33至40 km的极涡中，只要完整保持极涡，以极点为中心，HOCl混合比约为0.14 ppbv。因此受到的阳光相对较少。这是在中纬度和热带大气中的HOCl混合比峰值显着高于0.2 ppbv（按日均值）的海拔高度区域。在主要变暖过程中极涡的形变和位移后，富含ClO的涡旋空气更多暴露在阳光下，HO x 丰度的提高导致HOCl混合比大大提高（高达0.3 ppbv），大大超过了典型的中纬度热带地区的热带气候。 HOCl增加之前是ClO增加。模型运行只能在Stimpfle等人（2006年）发表时才能重现。 （1979）使用了ClO + HO 2 →HOCl + O 2 的反应速率常数，但不适用于当前的JPL建议。在24 km的高度，HOCl混合9月18日的数据中已经可见到这种HOCl增强，其最高比率可达0.15 ppbv。这归因于非均相化学，这与对平流层极地云的观测相一致。将测量结果与在观测期内没有出现平流层极地云的模型运行进行了比较。在模型中仍然生成HOCl的事实表明，HOCl的很大一部分是由ClO生成的，而不是直接通过异质反应生成的。测量中过量的ClO，较低的ClONO 2 和HOCl的早期损失归因于模型未再现的正在进行的异质化学作用。10月11日，极地涡旋平均日混合比仅为0.03 ppbv。

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