基于数字摄像能见度仪的北京地区降雨和雾霾天气能见度对比分析

doi:10.3969/j.issn.1673-503X.2020.01.004

Abstract

Abstract:

Digital Photographic Visibility System (DPVS) is an instrument to measure atmospheric visibility based on a similar principle of artificial visual measurement.The observed visibility from the DPVS, a forward-scattered meter (PWD22), and an atmospheric transmissometer (LT31) under rainfall and haze-fog weather events were compared in Beijing from March to August of 2017.The results indicated that visibility has an obvious negative correlation with relative humidity, particle matter concentration, and precipitation particles.Under low visibility conditions, the variations of visibility observed from three instruments are basically consistent with each other in spite of small differences.Visibility observed from the DPVS has smaller discreteness and better stability under moderate rainfall, heavy rainfall, rainstorm, and moderate haze-fog events.However, the visibility observed from the DPVS has large uncertainty during the transition period between daytime and nighttime, which should be improved by optimizing the algorithm in the future.

Key words: Digital photographic visibility system (DPVS), Rainfall weather, Haze-fog weather

CLC Number:

P427.2

Kai NIE, Jing-li WANG, Ming LEI, Wei HAN, Jin-cheng LIU. Comparison of visibility in rainfall and haze-fog weather in Beijing using digital photographic visibility system[J]. Journal of Meteorology and Environment, 2020, 36(1): 28-35.

Figures/Tables 5

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References 22

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仪器名称	型号	测量范围/m	测量精度/(%)	工作温度/℃	工作湿度/(%)	生产厂家
前向散射仪	PWD22	10—20000	±10, 10 m—10000 m±15, 10000 m—20000 m	-40~60	0—100	Vaisala
大气透射仪	LT31	10—15000	≤±10, 10 m—15000 m	-40~65	0—100	Vaisala
数字能见度仪	DPVS	0—15000	≤±10, 10 m—15000 m	-40~65	0—100	试制

日期	天气现象	相对湿度系数	PM_2.5浓度系数	小时降水量系数
2017/08/07	晴好天气	0.830^**	0.846^**	-
2017/03/28	轻度雾霾	0.735^**	0.872^**	-
2017/02/03	中度雾霾	0.568^**	0.845^**	-
2017/01/04	重度雾霾	0.873^**	0.517^**	-
2017/03/24	小雨天气	0.931^**	0.106	0.070
2017/08/27	中雨天气	0.936^**	0.001	0.730^**
2017/08/23	大雨天气	0.767^**	0.748^**	0.680^**
2017/08/02	暴雨天气	0.817^**	0.169	0.482^*

日期	天气现象	DPVS RSD	PWD22 RSD	LT31 RSD	DPVS RSD^*	PWD22 RSD^*
2017/08/07	晴好天气	9.85%	19.70%	3.15%	9.29%	20.46%
2017/03/28	轻度雾霾	43.37%	26.73%	33.61%	43.91%	37.44%
2017/02/03	中度雾霾	45.04%	53.40%	56.59%	50.99%	94.12%
2017/01/04	重度雾霾	92.80%	80.73%	90.54%	99.73%	136.74%
2017/03/24	小雨天气	77.08%	52.35%	47.15%	95.50%	89.94%
2017/08/27	中雨天气	57.27%	66.03%	58.72%	52.91%	60.75%
2017/08/23	大雨天气	59.30%	63.49%	58.10%	58.76%	65.92%
2017/08/02	暴雨天气	43.80%	44.89%	51.48%	38.57%	40.03%
	平均值	53.56%	50.92%	49.92%	56.21%	68.17%

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Comparison of visibility in rainfall and haze-fog weather in Beijing using digital photographic visibility system

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