Discovery of cloud top ozone on Venus

Discovery of cloud top ozone on Venus
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金星云顶臭氧的发现

DOI:
10.1016/j.icarus.2018.10.006
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发表时间:
2019
期刊:
影响因子:
3.2
通讯作者:
J. Bertaux
J. Bertaux
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
E. Marcq;L. Baggio;F. Lefévre;A. Stolzenbach;F. Montmessin;D. Belyaev;O. Korablev;J. Bertaux

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在首次在 90-100 公里高度范围内零星检测到夜间臭氧层(O3)之后(Montmessin 等人,2011 年),我们在此报告在金星上发现了另一个永久臭氧层,该层仅限于高纬度地区(北纬 50 度和南纬 50 度),位于 70 公里附近的高层云层。该检测是在通过反向散射太阳光中 250 nm 附近的紫外线吸收重新分析整个 SPICAV-UV nadir 数据集期间进行的。 O3 体积混合比峰值在 10–20 ppbv 范围内,产生 0.1–0.5 多布森单位 (DU) 的可观测柱密度,与火星上的标称值相当,但比地球上的标称值 (∼300 DU) 小得多。这些测量结果得到了我们的 3D 光化学模型与 LMD-IPSL GCM 的支持(Lebonnois 等,2010),这表明 SPICAV 识别的臭氧层是由平均经向环流在两极上空向下传输 O2(∼50 ppmv)分子造成的。我们的研究结果并不与之前基于 O2 测量的上限 (<2 ppmv) (Mills, 1999) 相矛盾,因为它们仅限于低纬度地区。
After the first sporadic detections of an ozone (O3) nighttime layer in the 90–100 km altitude range (Montmessin et al., 2011), we report here the discovery of another, permanent ozone layer on Venus, restricted to high latitudes (polewards of 50° both N and S) and located at the upper cloud level near 70 km. This detection was performed during a reanalysis of the whole SPICAV-UV nadir dataset through UV absorption near 250 nm in the backscattered solar light. The O3volume mixing ratio peaks in the 10–20 ppbv range, yielding observable column densities in the 0.1–0.5 Dobson units (DU), comparable to nominal values on Mars but much smaller than for Earth ( ∼ 300 DU). These measurements are supported by our 3D-photochemical model coupled with the LMD-IPSL GCM (Lebonnois et al., 2010), which indicates that the ozone layer identified by SPICAV results from downward transport of O2( ∼ 50 ppmv) molecules over the poles by the mean meridional circulation. Our findings do not contradict previous upper limits ( < 2 ppmv) based on O2measurements (Mills, 1999), since they were restricted to lower latitudes only.
DOI: 10.1016/j.pss.2015.06.024
发表时间: 2015-11
影响因子: 2.4
作者:
R. Haus;D. Kappel;G. Arnold
通讯作者: R. Haus;D. Kappel;G. Arnold