气候变化领域集成服务门户(CCPortal): Particle size distribution and particulate matter concentrations during synoptic and convective dust events in West Texas

CCPortal

DOI	10.5194/acp-22-9161-2022
	Particle size distribution and particulate matter concentrations during synoptic and convective dust events in West Texas
	Ardon-Dryer, Karin; Kelley, Mary C.
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	9161
结束页码	9173
卷号	22 期号:13 页码:13
英文摘要	Dust events are an important and complex constituent of the atmospheric system that can impact Earth's climate, the environment, and human health. The frequency of dust events in the Southern High Plains of West Texas has increased over the past 2 decades, yet their impact on air quality in this region is still unclear. This is due to the fact that there is only one air quality monitoring station that measures only PM2.5 concentrations (particulate matter with an aerodynamic diameter < 2.5 mu m), and there is no information on other PM sizes or the particle size distribution. The Aerosol Research Observation Station (AEROS) unit provides insight into the local variation in particle concentration during different dust events and allows for a better understanding of the impact of dust events on air quality. As this area is prone to dust events, we were wondering if dust events generated by different meteorological causes (synoptic vs. convective) would present similar particle concentrations or particle size distributions. Thus, in this project, three different dust events were measured by AEROS and compared. Each dust event originated from a different direction and lasted a different duration. One of the dust events was synoptic (10 April 2019) and two were convective (5 and 21 June 2019). Measurements of particle mass and number concentration, size distribution, and meteorological conditions for each dust event were compared. The synoptic dust event (on 10 April) was longer (12 h) and had stronger wind speed conditions (up to 22.1 m s(-1)), whereas the two respective convective dust events on 5 and 21 June lasted only 20 and 30 min and had lower wind speeds (up to 16.5 and 13.4m s(-1)). Observation of PM based on daily and hourly values showed an impact on air quality, yet measurements based on daily and hourly values underestimate the impact of the convective dust events. Observations based on a shorter timescale (10 min) reveal the true impact of the two convective dust events. A comparison of the particle size distribution showed that all three dust events presented an increase in particles in the 0.3-10 mu m size range. Comparisons of the particle concentration for particles > 5 and > 10 mu m show very high values during the dust events. Some particle sizes even increase in concentration by similar to 2 orders of magnitude compared with the time before the dust event. This leads us to speculate that the impact of convective dust events on air quality in this region is underestimated with the current (hourly basis) method.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000825477100001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273364
作者单位	Texas Tech University System; Texas Tech University
推荐引用方式 GB/T 7714	Ardon-Dryer, Karin,Kelley, Mary C.. Particle size distribution and particulate matter concentrations during synoptic and convective dust events in West Texas[J],2022,22(13):13.
APA	Ardon-Dryer, Karin,&Kelley, Mary C..(2022).Particle size distribution and particulate matter concentrations during synoptic and convective dust events in West Texas.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(13),13.
MLA	Ardon-Dryer, Karin,et al."Particle size distribution and particulate matter concentrations during synoptic and convective dust events in West Texas".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.13(2022):13.