内蒙古半干旱区气溶胶散射特性及影响因素

doi:10.13866/j.azr.2024.05.02

Abstract

Abstract:

From observational data of scattering coefficients, the mass concentrations of aerosols and pollutants, and meteorological elements, collected from July 9, 2020 to July 8, 2023 in Xilinhot, the characteristics of aerosol scattering coefficients—including the variation over time, probability density distribution, and correlation with different types of aerosols and meteorological impact factors—are studied. Consequently, the scattering coefficient levels are classified. The results show that: (1) the overall level of aerosol scattering is relatively low, but the transport of dust aerosol in spring and the high frequency of temperature inversions in winter and at night may increase aerosol scattering. (2) The smaller the aerosol, the higher the correlation between aerosols and scattering coefficients, with the correlation coefficients following the order BC>PM_2.5>PM₁₀, although seasonal differences are observed. In addition, NO₂ is an important factor in increasing scattering in autumn, whereas SO₂ contributes to scattering in summer, autumn, and winter. (3) The increases in correlation coefficients are considered as the contribution rates of current meteorological factors to scattering coefficients, with contribution rates of between 1% and 2%.

Key words: the semiarid area, aerosol, scattering coefficient, gradation, contribution rate, Inner Mongolia

YE Hu, PEI Hao, JIANG Yanfeng, NA Qing, ZHANG Liwei. Properties of aerosol scattering and its influencing factors in semiarid areas of Inner Mongolia[J].Arid Zone Research, 2024, 41(5): 730-741.

Figures/Tables 15

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References 28

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数据类型	样本容量/个	有效样本量/个	有效样本率/%
散射系数	26280	25513	97.1
黑碳质量浓度	26280	25735	97.9
大气污染物质量浓度	1095	1020	99.5
日平均气温	1095	1088	99.4
日平均相对湿度	1095	1088	99.4
日平均风速	1095	1088	99.4
日最大风速风向	1095	1091	99.6
日降水量	1095	1079	98.5

计算方法	标准差	峰度	偏度	变异系数	置信度（95.0%）
M₁	109.18	259.49	12.82	1.82	1.34
M₂	106.01	275.84	13.30	1.87	1.30

计算方法	PM₁₀	PM_2.5	BC	SO₂	NO₂
M₁	0.481^**	0.652^**	0.814^**	0.045	0.198^**
M₂	0.487^**	0.661^**	0.815^**	0.045	0.190^**

取值区间 /（M·m^-1）	样本总数	春季占比/%	夏季占比/%	秋季占比/%	冬季占比/%
（400,1000]	153	39.9	3.9	11.8	44.4
>1000	32	100	0	0	0

大气污染物	春季	夏季	秋季	冬季
NO₂	-0.105	-0.132	0.401^**	0.649^**
SO₂	-0.141	0.215^**	0.210^**	0.246^**

Properties of aerosol scattering and its influencing factors in semiarid areas of Inner Mongolia

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季节	拟合关系	相关系数
春季	Y=-0.303X_PM10+3.333X_PM2.5+0.519X_BC-13.755	0.931
夏季	Y=-1.172X_PM10+5.741X_PM2.5+0.178X_BC+1.556X_SO2-8.227	0.803
秋季	Y=0.173X_PM10+2.763X_PM2.5+0.334X_BC+0.973X_SO2+1.379X_NO2-30.410	0.821
冬季	Y=0.386X_PM10+0.525X_PM2.5+0.344X_BC-0.968X_SO2+4.267X_NO2-13.997	0.848

等级	散射系数阈值 /（M·m^-1）	可能影响
低	≤30	PM_2.5空气质量分指数为优，BC质量浓度基本在100 ng·m^-3以下
中	（30,70]	PM_2.5空气质量分指数为良，BC质量浓度基本在200 ng·m^-3以下
高Ⅰ	（70,100]	污染物浓度可能达到轻度污染等级，短时可达中度或以上污染等级
高Ⅱ	（100,600]	污染物浓度可能达到中度污染等级，短时可达重度或以上污染等级
高Ⅲ	>600	PM₁₀污染物浓度可能达到重度或以上污染等级

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