A study of the atmospheric VOCs of Mount Tai in June 2006

Ting, Mao; Wang, Yuesi; Xu, Hui; Jie, Jiang; Wu, Fuzhong; Xu, Xiangde

doi:10.1016/j.atmosenv.2009.02.013

Cited by 28 publications

(7 citation statements)

References 18 publications

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“…It can be seen that the value of b was higher for long range transport (b = 0.19, R 2 = 0.79) than for local emission (b = 0.09, R 2 = 0.64). The value of b for long distant sources (0.19) as obtained in the present study was found to be slightly lower than 0.22 as observed over Mount Tai, China (Ting et al, 2009) and 0.23 as obtained in the Mediterranean Intensive Oxidant Study (MINOS) in August 2001 on Crete (Gros et al, 2003). But, it was much lower than 0.44 as observed over the remote NARE locations (Jobson et al, 1999) and 0.41 on a cruise through the western Indian Ocean during the INDOEX field study (Karl et al, 2001).…”

Section: Effect Of Local and Long Distant Sources On The Variability-contrasting

confidence: 68%

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Sarkar

Chatterjee

Majumdar

et al. 2014

Preprint

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Abstract. A first ever study on the characterization of volatile organic compounds (VOCs) has been made over a Himalayan high altitude station in India. A total of 18 VOCs (mono aromatics-BTEX (benzene, toluene, ethylbenzene, xylene), non-BTEX substituted aromatics and halocarbon) have been measured over Darjeeling (27.01° N, 88.15° E, 2200 m a.s.l.) in the eastern Himalaya in India during the period of July 2011–June 2012. The annual average concentration of the sum of 18 target VOCs (TVOC) was 376.3 ± 857.2 μg m−3. Monoaromatics had the highest contribution (72%) followed by other substituted aromatics (22%) and halocarbon (6%) compounds. Toluene was the most abundant VOC in the atmosphere of Darjeeling with the contribution of ~37% to TVOC followed by benzene (~21%), ethylbenzene (~9%) and xylenes (~6%). TVOC concentrations were highest during the postmonsoon season with minimum solar radiation and lowest during the premonsoon season with maximum solar radiation. Anthropogenic activities related mainly to tourists like diesel and gasoline emissions, biomass and coal burning, use of solvent and solid waste emissions were almost equal in both the seasons. Seasonal variation in TVOCs over Darjeeling was mainly governed by the incoming solar radiation rather than the emission sources. Source apportionment study using Positive Matrix Factorization (PMF) model indicated that major fraction of (~60%) TVOC were contributed by diesel and gasoline exhausts followed by solvent evaporation (18%) and other sources. Diesel exhaust was also found to have the maximum potential in tropospheric ozone formation. The atmospheric loading of BTEX over Darjeeling was found to be comparable with several Indian metro cities and much higher than other cities around the world.

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Section: Effect Of Local and Long Distant Sources On The Variability-contrasting

confidence: 68%

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Sarkar

Chatterjee

Majumdar

et al. 2014

Preprint

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“…The linear correlation between the FR and NMINP suggests one possibility, i.e., the H 2 SO 4 vapor was sufficient and the availability of organic vapor determined both the FR and the consumed amount of H 2 SO 4 vapor proportional to the NMINP. Previous field measurements have shown that gaseous H 2 SO 4 at concentrations of 10 5 molecules cm −3 is necessary for NPF (McMurry et al, 2005;Nieminen et al, 2009;Erupe et al, 2010;Lee et al, 2019). In this study, the estimated H 2 SO 4 concentration was in the range of 10 6 -10 7 molecules cm −3 and was theoretically sufficient for NPF (Table 2).…”

Section: Potential Contribution To Ccn Production From the Npf Eventssupporting

confidence: 48%

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO2 emissions

et al. 2021

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Abstract. Because anthropogenic sulfur dioxide (SO2) emissions have decreased considerably in the last decade, PM2.5 pollution in China has been alleviated to some extent. However, the effects of reduced SO2 on the particle number concentrations and subsequent contributions of grown new particles to cloud condensation nuclei (CCN) populations, particularly at high altitudes with low aerosol number loadings, are poorly understood. In contrast, the increase in provincial forest areas in China with rapid afforestation over the last few decades expectedly increases the biogenic emissions of volatile organic compounds and their oxidized products as nucleating precursors therein. In this study, we evaluated the campaign-based measurements made at the summit of Mt. Tai (1534 m a.s.l.) from 2007 to 2018. With the decrease in SO2 mixing ratios from 15 ± 13 ppb in 2007 to 1.6 ± 1.6 ppb in 2018, the apparent formation rate (FR) of new particles and the net maximum increase in the nucleation-mode particle number concentration (NMINP) in the spring campaign of 2018 was 2- to 3-fold higher than those in the spring campaign of 2007 with almost the same occurrence frequency of new particle formation (NPF) events. In contrast, the campaign-based comparison showed that the occurrence frequency, in which the maximum geometric median diameter of the grown new particles (Dpgmax) was > 50 nm, decreased considerably from 43 %–78 % of the NPF events before 2015 to < 12 % in 2017–2018. Assuming > 50 nm as a CCN threshold size at high supersaturations, the observed net CCN production decreased from 3.7 × 103 cm−3 (on average) in the five campaigns before 2015 to 1.0 × 103 cm−3 (on average) in the two campaigns in 2017–2018. We argue that the increases in the apparent FR and NMINP are mainly determined by the availability of organic precursors that participate in nucleation and initial growth, whereas the decrease in the growth probability is caused by the reduced emissions of anthropogenic precursors. However, large uncertainties still exist because of a lack of data on the chemical composition of these smaller particles.

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“…campaign (Mao et al, 2009; no data from the spring 2007 campaign were available). However, the increase in TVOC and BVOC emissions in 2018 cannot provide sufficient direct information about the increase in nucleating organics, and the measurements of H2SO4 at Mt.…”

Section: Table 2 Provides a Comprehensive Comparison Of The Measured mentioning

confidence: 99%

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO2 emissions

Zhu¹,

Xue²,

Gao³

et al. 2020

Preprint

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Abstract. Because anthropogenic sulfur dioxide (SO2) emissions have decreased considerably in the last decade, PM2.5 pollution in China has been alleviated to some extent. However, the effects of reduced SO2 on the particle number concentrations and subsequent contributions of grown new particles to the cloud condensation nuclei (CCN) populations, particularly at high altitude with low aerosol number loadings, are poorly understood. In this study, we evaluated the campaign-based measurements made at the summit of Mt. Tai (1534&#8201;m&#8201;a.s.l.) from 2007 to 2018. With the decrease in the SO2 mixing ratios from 15&#8201;&#177;&#8201;13&#8201;ppb in 2007 to 1.6&#8201;&#177;&#8201;1.6&#8201;ppb in 2018, the formation rate of new particles (FR) and the net maximum increase in the nucleation-mode particle number concentration (NMINP) increased by 2&#8211;3 fold in 2018 against those in 2007. In contrast, the occurrence frequency of new particle formation (NPF) events in which the maximum geometric median diameter of grown new particles (Dpgmax) was >&#8201;50&#8201;nm decreased considerably from 43&#8201;%&#8211;78&#8201;% of the NPF events before 2015 to <&#8201;12&#8201;% in 2017&#8211;2018. Assuming >&#8201;50&#8201;nm as a CCN threshold size at high supersaturations, the observed net CCN production decreased from 3703&#8201;cm&#8722;3 (on average) before 2015 to 1026&#8201;cm&#8722;3 (on average) in 2017&#8211;2018. We argue that the increase in the FR and NMINP is mainly determined by the availability of organic precursors that participate in nucleation and initial growth, whereas the decrease in the growth probability is caused by the reduced emissions of anthropogenic precursors. However, large uncertainties still exist because of a lack of data on the chemical composition of these smaller particles.

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A study of the atmospheric VOCs of Mount Tai in June 2006

Cited by 28 publications

References 18 publications

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO<sub>2</sub> emissions

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO<sub>2</sub> emissions

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A study of the atmospheric VOCs of Mount Tai in June 2006

Cited by 28 publications

References 18 publications

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Volatile organic compounds over Eastern Himalaya, India: temporal variation and source characterization using Positive Matrix Factorization

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO&lt;sub&gt;2&lt;/sub&gt; emissions

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO&lt;sub&gt;2&lt;/sub&gt; emissions

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Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO<sub>2</sub> emissions

Increased new particle yields with largely decreased probability of survival to CCN size at the summit of Mt. Tai under reduced SO<sub>2</sub> emissions