Spatial distribution and biogeochemical cycling of methyl iodide in the Yellow Sea and the East China Sea during summer

Li, Yan; He, Zhen; Yang, Gui‐Peng; Zou, Yawen

doi:10.1016/j.envpol.2021.116749

Cited by 5 publications

(4 citation statements)

References 74 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Moreover, experiments show that CH3I emission under dark incubation was much lower than that under light incubation and CH3I production under visible light conditions is lower than that under natural light (Li et al, 2021). Those results indicate that ultraviolet light promotes the production 480 of CH3I (Chen et al, 2020;Li et al, 2021) as well as its photochemical oxidation. This is consistent with our observation that HIOx is only formed in the daytime (Fig.…”

mentioning

confidence: 87%

“…CH3I concentration was shown to be correlated with surface seawater temperature (SST) in marine boundary layer air at midlatitude (Yokouchi et al, 2008). Others reported the opposite results in the Yellow Sea and the East China Sea during summer (Li et al, 2021) and the reason may be that higher surface water temperature also accelerates the chemical loss of CH3I from the seawater and atmospheric CH3I is readily photolyzed. Long-term variations of atmospheric CH3I at several sites show that SST 465 near each site cannot fully explain the variation of observed CH3I concentrations (Yokouchi et al, 2012).…”

Section: Iodine Sources 420mentioning

confidence: 99%

“…Other factors such as acidification, i.e., pH conditions, mineral dust deposition and dissolved organic carbon (DOC) concentration (Li et al, 2021), as well as ferric ion (Fe 3+ ) concentration (Chen et al, 2020) in seawater could also contribute to the emission rate of CH3I.…”

Section: Iodine Sources 420mentioning

confidence: 99%

See 2 more Smart Citations

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

Abstract. New particle formation processes contribute significantly to the number concentration of ultrafine particles (UFP), and have great impacts on human health and global climate. Iodine oxoacids (HIOx, including iodic acid, HIO3 and iodous acid, HIO2) have been observed in pristine regions and proved to dominate NPF events at some sites. However, the knowledge of HIOx in polluted urban areas is rather limited. Here, we conducted a long-term comprehensive observation of gaseous iodine oxoacids and sulfuric acid in Beijing from January 2019 to October 2021 and also in Nanjing from March 2019 to February 2020, and investigated the contribution of HIOx to UFP number concentration in urban environments. HIO3 concentration is highest in summer, up to 2.85×106 cm-3 and 2.78×106 cm-3 in Beijing and Nanjing, respectively, and is lowest in winter, with a more prominent seasonal variation than H2SO4. HIO3 concentration shows a clear diurnal pattern at both sites with a daily maximum at around noontime, similar to the atmospheric temperature, radiation and ozone (O3) levels. HIO2 concentration has the same diurnal and seasonal trend as HIO3 but is overall about one order of magnitude lower than HIO3 concentration. Back trajectory analysis suggests that the sources for inland iodine species could be a mix of marine and terrestrial origins, both having peak iodine emission in warm seasons. While the contribution of HIO2 to particle growth is marginal in Beijing and Nanjing, our results demonstrate that HIO3 enhances the particle survival probability of sub-3 nm particles by about 40 % (median) and occasionally by more than 100 % in NPF events, suggesting HIOx are non-negligible contributor to UFPs in polluted urban areas. As the growth contribution from HIO3 and H2SO4 is similar on a per-molecule basis, we propose that the sum of HIO3 and H2SO4 could be used to estimate sub-3 nm particle growth of inorganic acid origin, in the polluted atmospheres with a significant amount of HIOx.

show abstract

mentioning

confidence: 87%

Section: Iodine Sources 420mentioning

confidence: 99%

See 1 more Smart Citation

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Zhang

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…In recent years, organic iodides (such as CH 3 I) have attracted increasing attention from the atmospheric science community. 1 As a gaseous pollutant with high reactivity, CH 3 I mainly comes from the ocean, fumigants, and the spent fuel. 2 Among them, CH 3 I emitted from the reprocessing process of spent fuel is radioactive, because it is converted from radioactive isotopes 129 I (half-life, t 1/2 = 1.6 × 10 7 years) and 131 I ( t 1/2 = 8 days).…”

mentioning

confidence: 99%

On-site portable detection of gaseous methyl iodide using an electrochemical method

Yang,

Zhu,

Zhang

et al. 2024

Chem. Commun.

View full text Add to dashboard Cite

show abstract

Spatiotemporal distribution and environmental control factors of halocarbons in the Yangtze River Estuary and its adjacent marine area during autumn and spring

Zou

Liu

et al. 2022

Environmental Pollution

View full text Add to dashboard Cite

Spatial distribution and biogeochemical cycling of methyl iodide in the Yellow Sea and the East China Sea during summer

Cited by 5 publications

References 74 publications

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

Iodine oxoacids and their roles in sub-3 nanometer particle growth in polluted urban environments

On-site portable detection of gaseous methyl iodide using an electrochemical method

Spatiotemporal distribution and environmental control factors of halocarbons in the Yangtze River Estuary and its adjacent marine area during autumn and spring

Contact Info

Product

Resources

About