在ExoMars轨道探测器的早期观测中没有发现火星上的甲
Oleg Korablev1, Ann Carine Vandaele2, Franck Montmessin3
1Space Research Institute (IKI), Russian Academy of Sciences (RAS), Moscow, Russia. korab@iki.rssi.ru.
Nature
|April 12, 2019
概括
科学家们没有在火星上使用ExoMars轨道探测器发现甲. 这一发现挑战了之前的测量结果,并表明火星大气中可能存在快速移除过程.
科学领域:
- 星球科学
- 天体生物学
- 大气化学
背景情况:
- 在火星上发现甲表明了当前地球化学或生物活动的可能性.
- 之前的测量显示甲的变化是暂时的,局部的和季节性的.
- 这些发现与大气模型相冲突,
研究的目的:
- 进行高度敏感的火星大气甲测量.
- 为了协调火星上甲存在和分布的相互矛盾数据.
主要方法:
- 在ESA-Roscosmos ExoMars轨道探测器上使用了ACS和NOMAD仪器.
- 从2018年4月到8月收集的火星大气数据.
主要成果:
- 在火星大气层中没有检测到甲.
- 确定了大约10亿分之一的甲度上限.
- 这一限值比之前报告的检测值低10到100倍.
结论:
- 没有可检测的甲与之前的发现相矛盾.
- 一个未知的机制必须迅速从较低的大气层中去除或隔离甲以解释与盖尔坑数据的差异.
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