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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Analysis of OBrO, IO, and OIO absorption signature in UV-visible spectra measured at night and at sunrise by stratospheric balloon-borne instruments - art. no. 4161
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Analysis of OBrO, IO, and OIO absorption signature in UV-visible spectra measured at night and at sunrise by stratospheric balloon-borne instruments - art. no. 4161

机译：用平流层气球运载工具在夜间和日出测量的紫外可见光谱中分析OBrO，IO和OIO吸收特征-艺术。没有。 4161

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1] Absorption bands of OBrO, IO, and OIO in the visible region have been investigated in the data of the AMON ("Absorption par les Minoritaires Ozone et Nox'') and SALOMON ("Spectroscopie d'Absorption Lunaire pour l'Observation des Minoritaires Ozone et Nox'') balloon-borne spectrometers used to obtain measurements in the nighttime stratosphere, since 1992 and 1998 respectively. The absorption features initially detected in AMON residual spectra and attributed to OBrO are also observable in SALOMON data with better accuracy. New estimates of OBrO cross-section amplitudes taking into account recent laboratory measurements are used for the OBrO retrieval. A consequence is that previously published OBrO concentration and mixing ratio values are revised downwards of around 40%. Further tests are performed to assess the consistency of the OBrO detection. No correlation exists between OBrO and NO2 vertical profiles which practically rules out the possibility for the structures ascribed to OBrO absorption to be due to remaining NO2 contributions. It is shown that variability of OBrO quantities at high latitudes obtained from various AMON and SALOMON flights is possibly linked to the chemical processes involving the production of OClO. At midlatitudes, the exceptional and unexpected conditions of the April 28, 1999 SALOMON flight allow us to observe the drop in OBrO concentrations just after sunrise. As expected, if previous studies of stratospheric iodine species are considered, IO and OIO absorption lines are never detected in the residual spectra. The presence of unknown structures in the residual spectra in the IO and OIO absorption regions is obvious and tends to distort the retrievals. The possibility that these remaining features result from a temperature dependence effect or uncertainties of O-3 and/or NO2 cross-sections is suggested. Thus, more accurate laboratory measurements and sets of cross-sections for low temperature are needed. [References: 35
机译：1]在AMON（“ Aparsorption par les Minoritaires Ozone et Nox”）和SALOMON（“ Spectroscopie d'Absorbing Lunaire pour l'Observation des”）的数据中研究了可见光区域OBrO，IO和OIO的吸收带。自1992年和1998年以来，Minoritaires Ozone et Nox''气球式光谱仪分别用于夜间平流层的测量。最初在AMON残留光谱中检测到并归因于OBrO的吸收特征也可以在SALOMON数据中以更好的精度观察到。考虑到最近的实验室测量结果，对OBrO横截面幅度的新估计用于OBrO检索。结果是，先前公布的OBrO浓度和混合比值被向下修正约40％。进行进一步测试以评估OBrO检测的一致性。 OBrO和NO2垂直分布之间不存在相关性，这实际上排除了归因于OBrO吸收的结构可能是由于残留的NO2贡献所致。结果表明，从各种AMON和SALOMON飞行获得的高纬度OBrO量的变化可能与涉及OClO产生的化学过程有关。在中纬度，1999年4月28日SALOMON飞行的异常和出乎意料的条件使我们能够观察到日出后OBrO浓度下降。不出所料，如果考虑以前对平流层碘物种的研究，则在残留光谱中永远不会检测到IO和OIO吸收线。 IO和OIO吸收区域的残留光谱中存在未知结构，这是显而易见的，并且往往会使检索结果失真。建议这些剩余特征是由温度依赖性效应或O-3和/或NO2横截面的不确定性导致的。因此，需要针对低温的更准确的实验室测量结果和一组横截面。 [参考：35

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