Isotopic Measurements of Atmospheric Molecular Hydrogen (H2)

这个项目是利用同位素测量来研究大气中氢（H2）的预算。H2是对流层中第二丰富的活性气体，通过甲醛（HCHO）的光化学形成和破坏，直接与一氧化碳（CO）、甲烷（CH4）和非甲烷碳氢化合物的循环有关。目前，全球氢气预算仅平衡在50%左右。正在测量海洋地点、生物质燃烧期间、HCHO光解产生的H2以及土壤吸收H2期间的氘氢比（D/H）。这些样品中氘的富集程度将表明土壤和氢的光化学汇的相对重要性。这项工作有助于解决目前全球H2收支的差异，并有助于全面了解对流层中CO、CH4和H2浓度增加的重要性。此外，如果氢气在未来成为一种重要的能源，那么了解其全球预算将变得更加重要。

This project is investigating the atmospheric hydrogen (H2) budget using isotopic measurements. H2 is the second most abundant reactive gas in the troposphere and is directly tied to the cycling of carbon monoxide (CO), methane (CH4), and non-methane hydrocarbons via the photochemical formation and destruction of formaldehyde (HCHO). Currently, the global H2 budget is balanced only to within about 50%. Measurements are being made of the ratio of deuterium to hydrogen (D/H) in marine locations, in areas during biomass burning, and in H2 produced by the photolysis of HCHO, and during soil uptake of H2. The degree of enrichment of deuterium in these samples will indicate the relative importance of the soil and the photochemical sinks for H2. This work is helping to resolve the current discrepancies in the global budget of H2 and contribute to the overall understanding of the importance of increasing concentrations of CO, CH4, and H2 in the troposphere. Also, if H2 becomes an important energy source in the future, it will become even more important to understand its global budget.