论文标题
Co $ _2 $配置文件和先锋金星大探针中性质谱仪的分析模型
The CO$_2$ Profile and Analytical Model for the Pioneer Venus Large Probe Neutral Mass Spectrometer
论文作者
论文摘要
我们为金星（64.2-0.9 km）提供了明显更新的Co $ _2 $高度剖面，并为潜在的深层大气粒子（17公里和下）提供支持。我们通过开发一个新的分析模型，用于通过先锋金星（PVLP）中性质谱仪（LNM）获得的新分析模型。我们的模型解释了下降过程中LNMS构型和输出的变化，并通过数据拟合程序可以分离同型物种，该程序可以调整峰值形状的质量依赖性变化。 The model yields CO$_2$ in units of density (kg m-3), isotope ratios for $^{13}$C/$^{12}$C and $^{18}$O/$^{16}$O, and 14 measures of CO$_2$ density across 55.4-0.9 km, which represents the most complete altitude profile for CO$_2$ at 60 km towards the surface to 日期。 CO $ _2 $密度曲线也与PVLP和Venera航天器的压力，温度和体积测量值一致。 LNMS质量分析仪的名义和低噪声操作得到了几种内部标准的行为（例如，电离产量，分裂产率和峰形）（例如，Ch $^{3+} $，Ch $^$^$^{4+} $，$^{40} $^{40} $ A $^$^+$，$，$，$，$，$，$，$，$，$，$，$，$，$^$，^136} $^{136} $ xe $^+$），在整个下降过程中进行了跟踪。最后，我们对Co $ _2 $ profile和LNMS光谱的评论揭示了迄今中较低气氛中入口的局部局部局部和快速清除的堵塞，以及随后在多个群众的几个数据尖峰。总之，这些观察结果表明，大气摄入受到17 km（和较低）的颗粒的影响，并且在入口处的快速颗粒降解产生了临时质量信号进入LNM。
We present a significantly updated CO$_2$ altitude profile for Venus (64.2-0.9 km) and provide support for a potential deep lower atmospheric haze of particles (17 km and lower). We extracted this information by developing a new analytical model for mass spectra obtained by the Pioneer Venus Large Probe (PVLP) Neutral Mass Spectrometer (LNMS). Our model accounts for changes in LNMS configuration and output during descent and enables the disentanglement of isobaric species via a data fitting routine that adjusts for mass-dependent changes in peak shape. The model yields CO$_2$ in units of density (kg m-3), isotope ratios for $^{13}$C/$^{12}$C and $^{18}$O/$^{16}$O, and 14 measures of CO$_2$ density across 55.4-0.9 km, which represents the most complete altitude profile for CO$_2$ at 60 km towards the surface to date. The CO$_2$ density profile is also consistent with the pressure, temperature, and volumetric gas measurements from the PVLP and VeNeRa spacecraft. Nominal and low-noise operations for the LNMS mass analyzer are supported by the behaviors (e.g., ionization yields, fragmentation yields, and peak shapes) of several internal standards (e.g., CH$^{3+}$, CH$^{4+}$, $^{40}$Ar$^+$, $^{136}$Xe$^{2+}$, and $^{136}$Xe$^+$), which were tracked across the descent. Lastly, our review of the CO$_2$ profile and LNMS spectra reveals hitherto unreported partial and rapidly clearing clogs of the inlet in the lower atmosphere, along with several ensuing data spikes at multiple masses. Together, these observations suggest that atmospheric intake was impacted by particles at 17 km (and lower) and that rapid particle degradation at the inlet yielded a temporary influx of mass signals into the LNMS.
