SO2 in the Middle Atmosphere of Venus: IR Measurements from Venera-15 and Comparison to UV Data
SO2 in the Middle Atmosphere of Venus: IR Measurements from Venera-15 and Comparison to UV Data
复制标题
金星中层大气中的 SO2：Venera-15 的红外测量以及与紫外数据的比较
DOI：
10.1006/icar.1993.1113
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发表时间：
1993
期刊：
影响因子：
3.2
通讯作者：
C. Na
中科院分区：
文献类型：
--
作者：
L. Zasova;V. Moroz;L. Esposito;C. Na
摘要我们介绍和比较两套金星SO2测量：红外光谱从苏联金星15轨道器和紫外光谱从美国先锋金星轨道器和探空火箭。我们选择40毫巴的气压水平进行比较。在低纬度和中纬度，这两个数据集给出的混合比（SO2）的十亿分之几十和SO2标度高度（HSO 2）的1.5-2.5公里，这是在良好的协议与光化学预测值。这证实了光化学过程在这一纬度范围内占主导地位。这两组数据都显示，在高纬度地区，二氧化硫的丰度增加到十亿分之几百。推导出的尺度高度，但是，不一致的高纬度地区：红外数据显示出很大的变化与动态功能，如冷领，高扩散云，热偶极子和极冠;紫外线数据显示减少到HSO 2 = 1公里。从红外资料中，我们得到冷环外HSO 2 = 3-5 km，热偶极子内HSO 2 = 100-200 ppb（在高弥散云区HSO 2增加到1000 ppb）。对于冷环，IR数据得出HSO 2 = 1-10 ppb和HSO 2 = 1 km。为了解释红外和紫外结果之间的差异，我们得出结论，SO2的规模高度可能会降低69公里以上的高度（P = 40 mb）：规模高度的差异是由不同的视角和不同的不透明度在紫外和红外波长。时间上的变化也可能起作用。
Abstract We present and compare two sets of Venus SO2 measurements: IR spectra from the USSR Venera 15 orbiter and UV spectra from the US Pioneer Venus orbiter and sounding rockets. We choose the 40-mb pressure level for this comparison. At low and mid latitudes, both data sets give a mixing ratio (ƒso2) of tens of parts per billion and SO2 scale height (Hso2) of 1.5-2.5 km, which are in good agreement with photochemically predicted values. This confirms that photochemical processes dominate in this latitude range. Both data sets show the SO2 abundance increasing to several hundred parts per billion at high latitudes. The derived scale heights, however, are discrepant for high latitudes: IR data show great variability associated with dynamic features such as the cold collar, high diffuse clouds, the hot dipole and the polar cap; UV data show a decrease to Hso2 = 1 km. From the IR data, we derive Hso2 = 3-5 km outside the cold collar, and ƒso2 = 100-200 ppb in the hot dipole (increasing of ƒso2 = 1000 ppb in regions with high diffuse clouds). For the cold collar, the IR data yield ƒso2 = 1-10 ppb and Hso2 = 1 km. To explain the differences between the IR and UV results, we conclude that the SO2 scale height may decrease above 69 km altitude (P = 40 mb): the scale height differences are explained by the different viewing angles and the different opacity at UV and IR wavelengths. It is possible that temporal variations also contribute.