A simple procedure for correcting loading effects of aethalometer data.
A simple procedure for correcting loading effects of aethalometer data.
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DOI：
10.3155/1047-3289.57.10.1214
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发表时间：
2007-10
影响因子：
2.7
通讯作者：
A. Virkkula;T. Mäkelä;R. Hillamo;T. Yli-Tuomi;A. Hirsikko;K. Hämeri;I. Koponen
中科院分区：
文献类型：
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作者：
A. Virkkula;T. Mäkelä;R. Hillamo;T. Yli-Tuomi;A. Hirsikko;K. Hämeri;I. Koponen
本文提出了一种简单的大气蒸发仪数据负荷效应修正方法。公式BC（校正）=（1 + k x ATN）x BC（非校正），其中ATN是衰减，BC是黑碳，用于校正从三个不同地点的测量中获得的风速计数据：赫尔辛基的地铁站、赫尔辛基的城市背景测量站和芬兰芬兰中部Hyytiälä的农村站。将BC数据与同时测量的气溶胶体积浓度（V）进行比较。在校正算法之后，BC与V比在随后的滤波器斑点之间保持相对稳定，这可以被视为校正算法起作用的间接证据。从室外站点计算的k值有一个明确的季节循环，可以解释为在冬季比在夏季更暗的气溶胶。当BC对总气溶胶体积的贡献高时，k因子高，反之亦然。在冬季，在所有波长的k值非常接近，从地铁站的数据。在夏季，k值是波长依赖的，往往是负的。当k值为负值时，未校正的BC浓度高估了真实浓度。
A simple method for correcting for the loading effects of aethalometer data is presented. The formula BC(CORRECTED) = (1 + k x ATN) x BC(NONCORRECTED), where ATN is the attenuation and BC is black carbon, was used for correcting aethalometer data obtained from measurements at three different sites: a subway station in Helsinki, an urban background measurement station in Helsinki, and a rural station in Hyytiälä in central Finland. The BC data were compared with simultaneously measured aerosol volume concentrations (V). After the correction algorithm, the BC-to-V ratio remained relatively stable between consequent filter spots, which can be regarded as indirect evidence that the correction algorithm works. The k value calculated from the outdoor sites had a clear seasonal cycle that could be explained by darker aerosol in winter than in summer. When the contribution of BC to the total aerosol volume was high, the k factor was high and vice versa. In winter, the k values at all wavelengths were very close to that obtained from the subway station data. In summer, the k value was wavelength dependent and often negative. When the k value is negative, the noncorrected BC concentrations overestimated the true concentrations.