论文标题
木星赤道区的水丰度
The water abundance in Jupiter's equatorial zone
论文作者
论文摘要
氧气是木星大气中氢气和氦气后最常见的元素，并且可能是原球盘中的主要凝结（如水冰）。在进行Juno任务之前，从Galileo探针中获得了木星水丰度的原位测量，该探针落入了气象异常的地点。伽利略探针的发现尚无定论，因为探针死亡时的水浓度仍在增加。在这里，我们最初报告了赤道区域的水丰度，北纬0至4度，基于Juno微波辐射计的1.25至22 GHz数据，探测约0.7至30 bars压力。由于朱诺（Juno）发现深层气氛是纬度的函数令人惊讶的变化，因此仍然要确认赤道丰度是否代表了木星的全球水丰度。赤道区域的水丰度被推断为$ 2.5 _ { - 1.6}^{+2.2} \ times10^3 $ ppm，或$ 2.7 _ { - 1.7}^{+2.4} $乘以原始的氧气元素元素比率与H（1 $σ$ forneAties）。如果反映了全球水丰度，结果表明，形成的木星的行星不太可能是富含水的覆盖水合物。
Oxygen is the most common element after hydrogen and helium in Jupiter's atmosphere, and may have been the primary condensable (as water ice) in the protoplanetary disk. Prior to the Juno mission, in situ measurements of Jupiter's water abundance were obtained from the Galileo Probe, which dropped into a meteorologically anomalous site. The findings of the Galileo Probe were inconclusive because the concentration of water was still increasing when the probe died. Here, we initially report on the water abundance in the equatorial region, from 0 to 4 degrees north latitude, based on 1.25 to 22 GHz data from Juno Microwave radiometer probing approximately 0.7 to 30 bars pressure. Because Juno discovered the deep atmosphere to be surprisingly variable as a function of latitude, it remains to confirm whether the equatorial abundance represents Jupiter's global water abundance. The water abundance at the equatorial region is inferred to be $2.5_{-1.6}^{+2.2}\times10^3$ ppm, or $2.7_{-1.7}^{+2.4}$ times the protosolar oxygen elemental ratio to H (1$σ$ uncertainties). If reflective of the global water abundance, the result suggests that the planetesimals formed Jupiter are unlikely to be water-rich clathrate hydrates.
