大气分子团簇离子对红外辐射的吸收
Absorption of infra-red radiation by atmospheric molecular cluster-ions
摘要：
质子化水团簇是大气分子团簇-离子中常见的一种，由宇宙射线在对流层和平流层产生。在晴空条件下或大气电离增加的时期，例如太阳质子事件，大气离子的红外吸收可能通过辐射平衡影响气候。本文用傅立叶变换红外光谱法在光程为545米的长波池中测定了电晕产生的正分子团簇离子的红外吸收。实验室光谱实验中离子的柱浓度估计为~10^13 m-2;使用简单模型估计质子化大气离子的柱浓度为~10^14 m-2。两个区域的吸收，在12.3和9.1微米与增强的离子浓度。在对测量的光谱进行滤波以补偿来自中性水蒸气和残余二氧化碳的伪信号之后，最强吸收区域在9.5至8.8 μ m处（1050至1140 cm-1），透射率的分数变化为0.03 ± 0.015，并且在12.5至12.1 μ m（800至825 cm-1）处的吸收为0.015 ± 0.008。
英文摘要：
Protonated water clusters are a common species of atmospheric molecular cluster-ion, produced by cosmic rays throughout the troposphere and stratosphere. Under clear-sky conditions or periods of increased atmospheric ionisation, such as solar proton events, the IR absorption by atmospheric ions may affect climate through the radiative balance. Fourier Transform Infrared Spectrometry in a long path cell, of path length 545m, has been used to detect IR absorption by corona-generated positive molecular cluster-ions. The column concentration of ions in the laboratory spectroscopy experiment was estimated to be ~10^13 m-2; the column concentration of protonated atmospheric ions estimated using a simple model is ~10^14 m-2. Two regions of absorption, at 12.3 and 9.1 um are associated with enhanced ion concentrations. After filtering of the measured spectra to compensate for spurious signals from neutral water vapour and residual carbon dioxide, the strongest absorption region is at 9.5 to 8.8 um (1050 to 1140 cm-1) with a fractional change in transmissivity of 0.03 plus/minus 0.015, and the absorption at 12.5 to 12.1 um (800 to 825 cm-1) is 0.015 plus/minus 0.008.
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