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首页> 外文期刊>Atmospheric chemistry and physics >Novel approaches to improve estimates of short-lived halocarbon emissions during summer from the Southern Ocean using airborne observations
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Novel approaches to improve estimates of short-lived halocarbon emissions during summer from the Southern Ocean using airborne observations

机译：利用空中观测，新颖的方法改善南海夏季夏季短期卤代碳排放的探测

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Fluxes of halogenated volatile organic compounds (VOCs) over the Southern Ocean remain poorly understood, and few atmospheric measurements exist to constrain modeled emissions of these compounds. We present observations of CHBr3, CH2Br2, CH3I, CHClBr2, CHBrCl2, and CH3Br during the O-2/N-2 Ratio and CO2 Airborne Southern Ocean (ORCAS) study and the second Atmospheric Tomography mission (ATom-2) in January and February of 2016 and 2017. Good model-measurement correlations were obtained between these observations and simulations from the Community Earth System Model (CESM) atmospheric component with chemistry (CAM-Chem) for CHBr3, CH2Br2, CH3I, and CHClBr2 but all showed significant differences in model : measurement ratios. The model : measurement comparison for CH3Br was satisfactory and for CHBrCl2 the low levels present precluded us from making a complete assessment. Thereafter, we demonstrate two novel approaches to estimate halogenated VOC fluxes; the first approach takes advantage of the robust relationships that were found between airborne observations of O-2 and CHBr3, CH2Br2, and CHClBr2. We use these linear regressions with O-2 and modeled O-2 distributions to infer a biological flux of halogenated VOCs. The second approach uses the Stochastic Time-Inverted Lagrangian Transport (STILT) particle dispersion model to explore the relationships between observed mixing ratios and the product of the upstream surface influence of sea ice, chl a, absorption due to detritus, and downward shortwave radiation at the surface, which in turn relate to various regional hypothesized sources of halogenated VOCs such as marine phytoplankton, phytoplankton in seaice brines, and decomposing organic matter in surface seawater. These relationships can help evaluate the likelihood of particular halogenated VOC sources and in the case of statistically significant correlations, such as was found for CH3I, may be used to derive an estimated flux field. Our results are consistent with a biogenic regional source of CHBr3 and both nonbiological and biological sources of CH3I over these regions.
机译：南海卤化挥发性有机化合物（VOC）的助熔剂仍然明朗地仍然差，存在很少的大气测量以限制这些化合物的建模排放。我们在1月和2月期间介绍O-2 / N-2比率和CO2空中南海（ORCAS）研究和第二次大气断层扫描使命（ATOM-2）期间的触发器3，CH2BR2，CH3I，CHCLBR2，CH3CL2和CH3BR的观察结果2016年和2017年。从社区地球系统模型（CESM）大气组分的这些观测和模拟之间获得了良好的模型测量相关性，用于Chbr3，CH2BR2，CH3I和CHClbr2，但所有这些观察室模型：测量比。该模型：CH3BR的测量比较令人满意，对于CHBRCL2的低水平呈现出完全评估。此后，我们展示了两种估计卤化VOC势态的新方法;第一种方法利用了O-2和CHBR3，CH2BR2和CHCLBR2的空气传播观察之间发现的稳健关系。我们使用这些线性回归与O-2和建模的O-2分布来推断出卤化VOC的生物通量。第二种方法使用随机时代倒拉格朗日传输（高跷）粒子分散模型，探讨观察到的混合比与海冰，CHL A，由于碎屑而吸收的上游表面影响之间的关系，以及向下的短波辐射表面，其又涉及各种区域假设卤化VOC的来源，如海洋浮游植物，海地植物中的浮游植物，以及在表面海水中分解有机物。这些关系可以帮助评估特定卤化VOC源的可能性，并且在统计学上显着的相关性的情况下，可以使用诸如CH3i的诸如CH3i的情况来获得估计的助焊场。我们的研究结果与这些地区的生物区域生物区域源自生物区域来源以及CH3I的非生物学和生物学来源。

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