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Chan Miller, Christopher,Jacob, Daniel J.,Marais, Eloise A.,Yu, Karen,Travis, Katherine R.,Kim, Patrick S.,Fisher, Jenny A.,Zhu, Lei,Wolfe, Glenn M.,Hanisco, Thomas F.,Keutsch, Frank N.,Kaiser, Jennif Copernicus GmbH 2017 Atmospheric Chemistry and Physics Vol.17 No.14
<P>Abstract. Glyoxal (CHOCHO) is produced in the atmosphere by the oxidation of volatile organic compounds (VOCs). Like formaldehyde (HCHO), another VOC oxidation product, it is measurable from space by solar backscatter. Isoprene emitted by vegetation is the dominant source of CHOCHO and HCHO in most of the world. We use aircraft observations of CHOCHO and HCHO from the SENEX campaign over the southeast US in summer 2013 to better understand the CHOCHO time-dependent yield from isoprene oxidation, its dependence on nitrogen oxides (NOx ≡ NO + NO2), the behavior of the CHOCHO-HCHO relationship, the quality of OMI CHOCHO satellite observations, and the implications for using CHOCHO observations from space as constraints on isoprene emissions. We simulate the SENEX and OMI observations with the Goddard Earth Observing System chemical transport model (GEOS-Chem) featuring a new chemical mechanism for CHOCHO formation from isoprene. The mechanism includes prompt CHOCHO formation under low-NOx conditions following the isomerization of the isoprene peroxy radical (ISOPO2). The SENEX observations provide support for this prompt CHOCHO formation pathway, and are generally consistent with the GEOS-Chem mechanism. Boundary layer CHOCHO and HCHO are strongly correlated in the observations and the model, with some departure under low-NOx conditions due to prompt CHOCHO formation. SENEX vertical profiles indicate a free-tropospheric CHOCHO background that is absent from the model. The OMI CHOCHO data provide some support for this free-tropospheric background and show southeast US enhancements consistent with the isoprene source but a factor of 2 too low. Part of this OMI bias is due to excessive surface reflectivities assumed in the retrieval. The OMI CHOCHO and HCHO seasonal data over the southeast US are tightly correlated and provide redundant proxies of isoprene emissions. Higher temporal resolution in future geostationary satellite observations may enable detection of the prompt CHOCHO production under low-NOx conditions apparent in the SENEX data. </P>
America’s Role in the Making of Japan’s Economic Miracle
Michael Beckley,Yusaku Horiuchi,Jennifer M. Miller 동아시아연구원 2018 Journal of East Asian Studies Vol.18 No.1
Japan’s remarkable postwar growth spurt in the 1960s would not have been possible without Japan’s alliance with the United States. Policy makers, political scientists, economists, historians, and journalists on both sides of the Pacific have made this claim, but no study has yet tested it with modern statistical methods. In this article, we compare the economic growth trajectories of Japan and a statistically constructed “synthetic” Japan, which had a similar profile until the late 1950s but did not experience the consolidation of the US–Japan alliance, a process that began in 1958 and culminated with the signing of a formal defense pact in January 1960. We find that Japan’s per capita gross domestic product (GDP) grew much faster than the synthetic Japan’s from 1958 to 1968. We substantiate these results with in-depth historical analyses on how the United States facilitated Japan’s economic miracle.