Determination of enhancement ratios of HCOOH relative to CO in biomass burning plumes by the Infrared Atmospheric Sounding Interferometer (IASI)
Determination of enhancement ratios of HCOOH relative to CO in biomass burning plumes by the Infrared Atmospheric Sounding Interferometer (IASI)
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通过红外大气探测干涉仪 (IASI) 测定生物质燃烧羽流中 HCOOH 相对于 CO 的增强率
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
P. Coheur
中科院分区：
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作者：
M. Pommier;C. Clerbaux;P. Coheur
抽象的。甲酸 (HCOOH) 的浓度经常被模型低估，并且其化学性质高度不确定。然而，HCOOH 是大气中最丰富的挥发性有机化合物之一，它可能是导致偏远地区雨水酸化的原因。对 2008 年至 2014 年红外大气探测干涉仪 (IASI) 的 HCOOH 数据进行了分析，以估计七个地区生物质燃烧排放的增强率。受火灾影响的 HCOOH 和 CO 总柱值是通过结合 IASI 的总柱值、中分辨率成像光谱辐射计 (MODIS) 的火灾地理位置以及欧洲中期天气预报中心 (ECMWF) 的表面风速场来定义的。在选定的生物质燃烧区域，这些受火灾影响的 HCOOH 和 CO 总柱之间存在稳健的相关性，允许计算亚马逊地区 (AMA) 的增强比率等于 7.30 × 10−3±0.08 × 10−3molmol−1，11.10 × 10−3±1.37 × 10−3molmol−1澳大利亚 (AUS) 上空 6.80 × 10−3±0.44 × 10−3molmol−1 印度 (IND) 上空 5.80 × 10−3±0.15 × 10−3molmol−1 东南亚 (SEA)，北非 (NAF) 上空 4.00 × 10−3±0.19 × 10−3molmol−1，南非 (SAF) 上空 5.00 × 10−3±0.13 × 10−3molmol−1，以及西伯利亚 (SIB) 上空为 4.40 × 10−3±0.09 × 10−3molmol−1，与之前的研究相当一致。与参考排放比相比，还表明 IASI 在印度和东南亚捕获的选定农业燃烧羽流对应于最近未发生化学或汇的羽流。还提供了按燃烧燃料类型对增强率进行的附加分类，显示了 IASI 采样的羽流的不同来源，特别是在亚马逊流域和西伯利亚。不同地区生物群系增强率的差异表明，HCOOH 和 CO 的水平不仅取决于燃料类型。
Abstract. Formic acid (HCOOH) concentrations are often underestimated by models, and its chemistry is highly uncertain. HCOOH is, however, among the most abundant atmospheric volatile organic compounds, and it is potentially responsible for rain acidity in remote areas. HCOOH data from the Infrared Atmospheric Sounding Interferometer (IASI) are analyzed from 2008 to 2014 to estimate enhancement ratios from biomass burning emissions over seven regions. Fire-affected HCOOH and CO total columns are defined by combining total columns from IASI, geographic location of the fires from Moderate Resolution Imaging Spectroradiometer (MODIS), and the surface wind speed field from the European Centre for Medium-Range Weather Forecasts (ECMWF). Robust correlations are found between these fire-affected HCOOH and CO total columns over the selected biomass burning regions, allowing the calculation of enhancement ratios equal to 7.30 × 10−3 ± 0.08 × 10−3 mol mol−1 over Amazonia (AMA), 11.10 × 10−3 ± 1.37 × 10−3 mol mol−1 over Australia (AUS), 6.80 × 10−3 ± 0.44 × 10−3 mol mol−1 over India (IND), 5.80 × 10−3 ± 0.15 × 10−3 mol mol−1 over Southeast Asia (SEA), 4.00 × 10−3 ± 0.19 × 10−3 mol mol−1 over northern Africa (NAF), 5.00 × 10−3 ± 0.13 × 10−3 mol mol−1 over southern Africa (SAF), and 4.40 × 10−3 ± 0.09 × 10−3 mol mol−1 over Siberia (SIB), in a fair agreement with previous studies. In comparison with referenced emission ratios, it is also shown that the selected agricultural burning plumes captured by IASI over India and Southeast Asia correspond to recent plumes where the chemistry or the sink does not occur. An additional classification of the enhancement ratios by type of fuel burned is also provided, showing a diverse origin of the plumes sampled by IASI, especially over Amazonia and Siberia. The variability in the enhancement ratios by biome over the different regions show that the levels of HCOOH and CO do not only depend on the fuel types.