Characteristics, loss and gain of atmospheric carbonyl compounds in winters of 2008–2010 in Pearl River Delta region, China

Abstract

Formaldehyde (HCHO), acetaldehyde (CH 3 CHO) and acetone (CH 3 In 2010, the recovery of industrial activities occurred, but affected by traffic restriction enforcement in Guangzhou over the Asian Games period, HCHO concentration (daytime 7.59±2.59 μg m −3 ) was lower than expectation. Carbonyl compounds in WQS site were highly influenced by regional pollution transport from different upwind urban cities and industrial districts in the north-northwest to northeast wind sector in winter. Also, the interaction of the winter monsoon with the warm ocean along the coastline as well as day and night boundary layer mixing height variation affected carbonyl compound concentrations in WQS. The daytime mean dry deposition losses of HCHO and CH 3 CHO were first time model-estimated for 2009 and 2010. For loss of HCHO in the early afternoon, photolysis was the dominant sink, followed by dry deposition and removal by OH radical J Atmos Chem (2013) COCH

On-road vehicle emissions of glyoxal and methylglyoxal from tunnel tests in urban Guangzhou, China

“…No glyoxal and methylglyoxal were detected in the downstream cartridges, indicating the collecting efficiencies for glyoxal and methylglyoxal were nearly 100%. Detailed information can be found elsewhere (Lü et al, 2009;Liu et al, 2013). We got one more pair during 02:00e03:00 on June 27th and another one during 02:00e03:00 on June 30 th , and totally 76 valid carbonyl samples were collected in the tunnel.…”

Carbon Isotopic Analysis of Atmospheric Carbonyls Via Cysteamine Derivatization

“…When a great excess of cysteamine was used in the derivatization reaction, the carbonyls reacts quantitatively and thus introduces no effect on carbon isotopic fractionation. General concentration levels of formaldehyde, acetaldehyde, and acetone ranged from several μg•m −3 to hundreds of μg•m −3 in ambient air (Guo et al, 2014;Kourtchev et al, 2012;Liu et al, 2013;Reda et al, 2015;Zhang et al, 2019). In the gaseous derivatization process, the concentration range of simulation experiments of gaseous sampling is 5-5000 μg•m −3 , 5-4000 μg•m −3 , and 4-1000 μg•m −3 1.00 2.00 3.00 4.00 5.00 6.00 7.00 8.00 9.00 10.00 11.00 12.00 13.00 14.00 15.00 16.00 17.00 2).…”

“…Carbonyls play the important roles as intermediate products in photochemical processes in the atmosphere Guo et al 2014;Liu et al 2013). It is well known that formaldehyde, acetaldehyde, and acetone are the most representative carbonyls with the concentrations ranging from several to hundreds of μg•m −3 in ambient air, and that they could be derived from different sources such as auto exhaust, plant leaf, and photochemical production in air (Kourtchev et al, 2012;Reda et al, 2015;Zhang et al, 2019).…”

Seasonal and Diurnal Characteristics of Carbonyls in Urban Air in Qinzhou, China

“…These cities were highly polluted by pollutants such as airborne particles compared to Qinzhou. Due to the much lower latitude and less airborne particles in Qinzhou, the local actinic flux was expected to be relatively higher (Stockwell and Gol, 2004), likely resulted in the faster photochemical loss of carbonyls (Finlayson-Pitts and Pitts, 1986;Possanzini et al, 2002;Pang and Lee, 2010;Liu et al, 2013) and decreased their gaseous concentrations.…”