从高分辨率5- \textmu m光谱学得到的木星对流层中的氨
Ammonia in Jupiter's troposphere from high-resolution 5-\textmu m spectroscopy
摘要：
利用欧洲南方天文台甚大望远镜的高分辨率光谱仪CRIRES的空间分辨5- \textmu m观测资料研究了木星对流层氨（NH \textsubscript{3}）的丰度。高分辨能力（R= 96，000）允许分辨三个NH \textsubscript{3}吸收特征的线形。我们发现，在1- 4巴的压力范围内，NH \textsubscript{3}的丰度随海拔高度而降低。仪器狭缝沿着木星中央子午线南北对齐，使我们能够搜索纬度变化。大尺度纬度变化存在相当大的不确定性，因为与带状物相比，区域内云不透明度的增加可能掩盖吸收特征。然而，我们确实发现了在4- 6 $^{\circ}$ N的强烈NH \textsubscript{3}增强的证据，与木星北赤道带南部边缘的局部“氨羽流”一致。
英文摘要：
Jupiter's tropospheric ammonia (NH\textsubscript{3}) abundance is studied using spatially-resolved 5-\textmu m observations from CRIRES, a high resolution spectrometer at the European Southern Observatory's Very Large Telescope. The high resolving power (R=96,000) allows the line shapes of three NH\textsubscript{3} absorption features to be resolved. We find that within the 1--4 bar pressure range, the NH\textsubscript{3} abundance decreases with altitude. The instrument slit was aligned north-south along Jupiter's central meridian, allowing us to search for latitudinal variability. There is considerable uncertainty in the large-scale latitudinal variability, as the increase in cloud opacity in zones compared to belts can mask absorption features. However, we do find evidence for a strong NH\textsubscript{3} enhancement at 4--6$^{\circ}$N, consistent with a localised `ammonia plume' on the southern edge of Jupiter's North Equatorial Belt.
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