Hilario Miguel Ricardo A, Crosbie Ewan, Bañaga Paola Angela, Betito Grace, Braun Rachel A, Cambaliza Maria Obiminda, Corral Andrea F, Cruz Melliza Templonuevo, Dibb Jack E, Lorenzo Genevieve Rose, MacDonald Alexander B, Robinson Claire E, Shook Michael A, Simpas James Bernard, Stahl Connor, Winstead Edward, Ziemba Luke D, Sorooshian Armin
Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ, USA.
NASA Langley Research Center, Hampton, VA, USA.
Geophys Res Lett. 2021 Dec 16;48(23). doi: 10.1029/2021gl096520. Epub 2021 Nov 24.
Leveraging aerosol data from multiple airborne and surface-based field campaigns encompassing diverse environmental conditions, we calculate statistics of the oxalate-sulfate mass ratio (median: 0.0217; 95% confidence interval: 0.0154-0.0296; = 0.76; = 2,948). Ground-based measurements of the oxalate-sulfate ratio fall within our 95% confidence interval, suggesting the range is robust within the mixed layer for the submicrometer particle size range. We demonstrate that dust and biomass burning emissions can separately bias this ratio toward higher values by at least one order of magnitude. In the absence of these confounding factors, the 95% confidence interval of the ratio may be used to estimate the relative extent of aqueous processing by comparing inferred oxalate concentrations between air masses, with the assumption that sulfate primarily originates from aqueous processing.
利用来自多个涵盖不同环境条件的机载和地面实地考察活动的气溶胶数据，我们计算了草酸盐 - 硫酸盐质量比的统计数据（中位数：0.0217；95% 置信区间：0.0154 - 0.0296；n = 0.76；样本数量 = 2948）。草酸盐 - 硫酸盐比率的地面测量值落在我们的95% 置信区间内，这表明该范围在亚微米粒径范围内的混合层中是可靠的。我们证明，沙尘和生物质燃烧排放可分别使该比率向更高值偏移至少一个数量级。在没有这些混杂因素的情况下，该比率的95% 置信区间可用于通过比较气团之间推断的草酸盐浓度来估计水相处理的相对程度，前提是假设硫酸盐主要源自水相处理。
