Summertime tropospheric ozone over China simulated with a regional chemical transport model 2. Source contributions and budget
Summertime tropospheric ozone over China simulated with a regional chemical transport model 2. Source contributions and budget
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DOI：
10.1029/2001jd001355
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发表时间：
2002-11
影响因子：
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通讯作者：
Jianzhong Ma;Xiuji Zhou;D. Hauglustaine
中科院分区：
文献类型：
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作者：
Jianzhong Ma;Xiuji Zhou;D. Hauglustaine
[1]利用一个区域性三维化学输送模式，模拟了我国夏季对流层中NOx和O3浓度分布的各种来源的贡献。在模式中加入O3示踪剂，分别模拟平流层-对流层交换（STE）、侧边界输入（LBI）和NO原位光化学作用产生的O3的分布。示踪剂的活性氮物种进一步纳入模型中，以模拟氮氧化物的分布，分别来自地面排放，航空，闪电，STE和LBI。同时，通过来自这些来源的NO示踪剂通过化学反应形成的O3也被标记。模型结果表明，地面排放的NOx，因此在中国东部的污染边界层的O3浓度的主要贡献者。在高海拔地区，通过表面排放的NOx产生的O3占这些污染地区O3浓度的10-20%。飞机NOx排放对中国上空对流层O3的影响很小，在巡航高度贡献了2%的O3浓度。在边界层中，通过地面排放的NOx产生的O3净产量估计为132 Gg d−1，在自由对流层中为33 Gg d−1。由于有更多的O3输送到比出的区域和高相对湿度，在现场光化学作为一个汇的对流层中的O3在该地区。
[1] A regional three-dimensional chemical transport model is used to simulate the contributions of various sources to the NOx and O3 distributions in the troposphere over China during a summertime period. O3 tracers are added in the model to simulate the distribution of O3 that originates from stratosphere-troposphere exchange (STE), lateral boundary import (LBI) and in situ photochemistry via NO, respectively. Tracers for reactive nitrogen species are further incorporated into the model to simulate the distributions of NOx that originate from surface emissions, aviation, lightning, STE and LBI, respectively. Meanwhile, the O3 formed by chemical reactions via the NO tracer originating from these sources is also tagged. The model results indicate that surface emissions are the dominant contributor to the NOx and hence O3 concentrations in the polluted boundary layer of eastern China. At higher altitudes the O3 produced via surface-emitted NOx accounts for 10–20% of the O3 concentrations over these polluted regions. The impact of aircraft NOx emissions on tropospheric O3 over China is small, contributing up to 2% of the O3 concentrations at cruise altitudes. The net O3 production via surface-emitted NOx over the region is estimated to be 132 Gg d−1 in the boundary layer and 33 Gg d−1 in the free troposphere. Because there is much more O3 transported into than out of the region and high relative humidity, in situ photochemistry acts as a sink for O3 in the troposphere over the region.