Journal of Geophysical Research: Atmospheres Methyl, Ethyl, and Propyl Nitrates: Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments
Journal of Geophysical Research: Atmospheres Methyl, Ethyl, and Propyl Nitrates: Global Distribution and Impacts on Reactive Nitrogen in Remote Marine Environments
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烷基硝酸盐(RONO2)是对流层反应氮的重要组成部分，是氮氧化物(NOx、≡、NO+NO2)的储存库。在这里，我们在全球化学输送模式(GEOS-CHEM)中实现了一个新的大气甲基、乙基和丙基硝酸丙酯化学模拟。我们表明，该模型可以再现20年来航空观测的空间和季节变化。硝酸甲酯在全球占17千兆克氮，最大值出现在热带太平洋fic和南大洋。硝酸丙酯在大陆边界层中得到加强，但其全球影响(6ggN)受到生命周期较短(硝酸甲酯为8天，硝酸乙酯为26天，乙基硝酸乙酯为14天)的限制，这阻碍了长距离的输送。硝酸乙酯在三种植物中影响最小(4ggN)。我们fi发现，硝酸甲酯是南大洋海洋边界活性氮(NOy)的主要形式，南部非洲、南美洲和东南亚的NOx排放大幅增长(Turnock等人，2018年)。我们的结果表明，这种增长可能导致在南半球和热带顺风向海洋区域的RONO2增强和相关的NOx释放，这些地区已经是对RONO2循环最敏感的地区之一。
Alkyl nitrates (RONO 2 ) are important components of tropospheric reactive nitrogen that serve as reservoirs for nitrogen oxides (NO x ≡ NO + NO 2 ). Here we implement a new simulation of atmospheric methyl, ethyl, and propyl nitrate chemistry in a global chemical transport model (GEOS-Chem). We show that the model can reproduce the spatial and seasonal variability seen in a 20-year ensemble of airborne observations. Methyl nitrate accounts for 17 Gg N globally, with maxima over the tropical Pacific and Southern Ocean. Propyl nitrate is enhanced in continental boundary layers, but its global impact (6 Gg N) is limited by a short lifetime (8 days vs. 26 days for methyl nitrate and 14 days for ethyl nitrate) that inhibits long-range transport. Ethyl nitrate has the smallest impact of the three species (4 Gg N). We find that methyl nitrate is the dominant form of reactive nitrogen (NO y ) in the Southern Ocean marine boundary substantial NO x emissions growth in southern Africa, South America, and Southeast Asia (Turnock et al., 2018). Our results imply that such growth may lead to enhanced RONO 2 and associated NO x release over downwind ocean regions in the southern hemisphere and tropics—regions that are already among the most sensitive to RONO 2 cycling.