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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >IMPACT OF ASIAN EMISSIONS ON THE REMOTE NORTH PACIFIC ATMOSPHERE - INTERPRETATION OF CO DATA FROM SHEMYA, GUAM, MIDWAY AND MAUNA-LOA
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IMPACT OF ASIAN EMISSIONS ON THE REMOTE NORTH PACIFIC ATMOSPHERE - INTERPRETATION OF CO DATA FROM SHEMYA, GUAM, MIDWAY AND MAUNA-LOA

机译：亚洲排放量对远程北太平洋大气的影响-从SHEMYA，GUAM，MIDWAY和MAUNA-LOA解释CO数据

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In this study we look at the concentration of CO at four remote stations in the North Pacific to evaluate the impact of Asian industrial emissions on the remote atmosphere. Using a locally weighted smoothing technique to identify individual data outliers from the seasonal cycle, we have identified 22-92 outliers or ''events'' (greater than 5 ppbv above the seasonal cycle) at each site for the 3-6 year data records. Using isentropic back trajectories, we identify a possible source region for each event and present a distribution of the trajectory types. For the events at Midway, Mauna Loa, Guam, and Shemya, we are able to identify a source region for the elevated CO in 82, 72, 65, and 50% of the events, respectively. At Mauna Loa and Midway a majority of the events occur during spring and are usually associated with transport from Asia. These events bring the highest CO mixing ratios observed at any time during the year to these sites, with CO enhancements up to 46 ppb. At Guam, easterly trade winds are the norm, but occasionally synoptic events bring Asian emissions to the island, generally during late summer and fall, from either East Asia or Southeast Asia (e.g., Indonesia). These events bring with them the largest CO enhancements of any of the four sites considered in this paper, up to 58 ppb. Finally, to examine the robustness of our conclusions, we redo our analysis using the more stringent definition that an event must be either 10 or 15 ppb above the seasonal cycle. Although this reduces the number of events identified at each site, it does not significantly change the fraction of events which can be attributed to a known source. [References: 32]
机译：在这项研究中，我们研究了北太平洋四个偏远站点的CO浓度，以评估亚洲工业排放对偏远大气的影响。使用局部加权平滑技术从季节性周期中识别单个数据异常值，我们已针对3-6年的数据记录在每个站点上确定了22-92个异常值或“事件”（大于季节性周期5 ppbv） 。使用等熵向后轨迹，我们为每个事件确定一个可能的源区域，并给出轨迹类型的分布。对于Midway，Mauna Loa，关岛和Shemya的事件，我们能够分别在82％，72％，65％和50％的事件中确定CO升高的来源区域。在莫纳罗亚河和中途岛，大部分事件发生在春季，通常与来自亚洲的运输有关。这些事件将一年中任何时候观察到的最高CO混合比带到这些站点，CO增强高达46 ppb。在关岛，通常以东风为风，但偶尔发生的天气事件通常在夏末和秋季将亚洲排放物从东亚或东南亚（例如印度尼西亚）带到该岛。这些事件带来了本文所考虑的四个站点中最大的CO增强值，高达58 ppb。最后，为了检验结论的可靠性，我们使用更严格的定义重新进行分析，即事件必须比季节周期高10或15 ppb。尽管这减少了在每个站点识别的事件数量，但是并没有显着改变可归因于已知来源的事件比例。 [参考：32]

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