期刊
SCIENCE
卷 291, 期 5510, 页码 1939-1941出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1058913
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In Earth's environment, the observed polar outflow rate for O+ ions, the main source of oxygen above gravitational escape energy, corresponds to the Loss of similar to 18% of the present-day atmospheric oxygen over 3 billion years. However, part of this apparent Loss can actually be returned to the atmosphere. Examining loss rates of four escape routes with high-altitude spacecraft observations, we show that the total oxygen Loss rate inferred from current knowledge is about one order of magnitude smaller than the polar O+ outflow rate. This disagreement suggests that there may be a substantial return flux from the magnetosphere to the low-latitude ionosphere. Then the net oxygen Loss over 3 billion years drops to similar to2% of the current atmospheric oxygen content.
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