Globally significant oceanic source of organic carbon aerosol
Globally significant oceanic source of organic carbon aerosol
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DOI：
10.1029/2008gl033359
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发表时间：
2008-06
影响因子：
5.2
通讯作者：
D. Spracklen;S. Arnold;J. Sciare;K. Carslaw;C. Pio
中科院分区：
文献类型：
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作者：
D. Spracklen;S. Arnold;J. Sciare;K. Carslaw;C. Pio
在三个洋面观测点（阿姆斯特丹岛、亚速尔群岛和梅斯黑德）观测到有机碳气溶胶的显著浓度。两个全球化学传输模型（CTM）低估了这些地点的OC浓度（归一化平均偏差为-67%和-58%）。在高生物活动期间，月平均浓度低于预测值5-20倍。在阿姆斯特丹岛和梅斯黑德，观测到的OC与后向轨迹加权叶绿素a相关性良好（R2 = 0.61-0.77），表明海洋OC来源由生物活动驱动。我们使用遥感叶绿素a，返回轨迹和观测到的OC的组合，得出叶绿素a和海洋OC排放通量之间的经验关系。使用GEOS‐chem CTM，我们显示了全球海洋OC排放量，来自一次和二次源，为108 Tg/年，与观测结果相符。这一排放量与化石燃料的有机碳源相当，并使模拟的全球有机碳负担增加了20%。
Significant concentrations of organic carbon (OC) aerosol are observed at three oceanic surface sites (Amsterdam Island, Azores and Mace Head). Two global chemical transport models (CTMs) underpredict OC concentrations at these sites (normalised mean bias of −67% and −58%). During periods of high biological activity monthly mean concentrations are underpredicted by a factor of 5–20. At Amsterdam Island and Mace Head, observed OC correlates well (R2 = 0.61–0.77) with back‐trajectory weighted chlorophyll‐a, suggesting an oceanic OC source driven by biological activity. We use a combination of remote sensed chlorophyll‐a, back trajectories and observed OC to derive an empirical relation between chlorophyll‐a and the total oceanic OC emission flux. Using the GEOS‐chem CTM we show a global oceanic OC emission, from primary and secondary sources, of ∼8 Tg/year matches observations. This emission is comparable in magnitude to the fossil fuel OC source and increases the simulated global OC burden by 20%.