Dataset for the estimation of BrC absorption

Ths data file named 'SP2_dM_dlogD_HourAVG.CSV' contains the mass size distribution (dM/dlogDc) of refractory black carbon measured using a single-particle soot photometer (SP2) in urban Beijing during a period from 16 Feb. 2014 to 15 Mar. 2014. The dataset is recorded line by line at a time resolution of 1 hour. The first line of this file is the header line. There are 121 columns for the data file with the first 4 columns indicating the date and time of each record and the following 117 columns representing the dM/dlogDc values at corresponding diameter. The dM/dlogDc values with diameter lower than 70 nm and larger than 650 nm were excluded in the analysis according to the detection limit of SP2.The data file named 'AE31_Abs_HourAVG.CSV' stored the absorption coefficients measured using an AE31 aethalometer averaged in a time resolution of 1 hour. The record is stored line by line initial with a header line. The first 4 columns indicate the date and time of each record. The following 7 columns are the absorption coefficients.本数据集包含名为`SP2_dM_dlogD_HourAVG.CSV`的数据文件，其中存储了2014年2月16日至2014年3月15日期间，北京城区使用单颗粒炭黑光度计（single-particle soot photometer, SP2）测得的难熔黑碳（refractory black carbon）质量粒径分布（mass size distribution, dM/dlogDc）。数据以逐行格式存储，时间分辨率为1小时。该文件首行为表头行，共包含121列数据：前4列为每条记录的日期与时间信息，后续117列为对应粒径下的dM/dlogDc数值。依据单颗粒炭黑光度计的检测限，本分析中剔除了粒径小于70 nm及大于650 nm对应的dM/dlogDc数值。 另一数据文件名为`AE31_Abs_HourAVG.CSV`，存储了使用AE31型黑碳仪（aethalometer, AE31）测得的吸收系数，该数据已按1小时间隔进行平均。数据以逐行格式存储，首行为表头行，前4列为每条记录的日期与时间信息，后续7列为吸收系数数值。