Combination of Multiple Isotopes and PMF Model Provide Insights Into the Method Optimization of PM2.5 Source Apportionment During Haze Episodes DOI
Xinxin Feng, Yingjun Chen, Hongxing Jiang

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2024, Номер 129(23)

Опубликована: Ноя. 28, 2024

Abstract The key problems with Positive Matrix Factorization (PMF) model for PM 2.5 source apportionment were inconsistent results different species selections and a lack of evaluation criteria accuracy. Moreover, high proportions secondary inorganic aerosols sources (SNA) identified by PMF without corresponding primary sources. This study develops new method that combines multi‐isotopes ( 34 S, 15 N, 18 O 14 C) to optimize apportionment. Data sets A–F, constructed from components, input into obtain optimal (3–9 factors), which changed the selection species. Specifically, contributions coal combustion (CC, 3%–36%), biomass burning (BB, 11%–38%), vehicle (VS, 4%–15%) showed significant differences in data sets, indicating conventional methods cannot accurate results. Then, introduced restrict reallocate SNA sources, overcoming influence on Additionally, C was used evaluate results, combination more markers (data set F, 9‐factor) techniques obtained optimized aligned Compared initial CC, VS, BB allocated 9‐factor increased 26.4%, 5%, 19.5%, respectively, becoming main . represents first time achieves reapportionment evaluation, improving methods.

Язык: Английский

Changes in the Dominant Contributions of Nitrate Formation and Sources During Haze Episodes: Insights From Dual Isotopic Evidence DOI Creative Commons
Hong‐Wei Xiao,

Tianshu Chen,

Qijie Zhang

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(2)

Опубликована: Янв. 15, 2025

Abstract Inorganic nitrate (NO 3 − ), a crucial component of fine particulate matter (PM 2.5 has not shown consistent decrease, despite an obvious decrease nitrogen oxide (NOx) and PM . The atmospheric oxidation process for formation been deemed key factor in pollution; however, the changes sources pathways during particular haze episode require further investigation. Here, daily dual isotopes (δ 15 N δ 18 O) were used to quantify Qingdao, port city Northern China, from September 2017 February 2018. This study also includes detailed introduction two episodes. O results show that both fractions nocturnal NOx coal combustion lower warmer season higher colder season. increased with increasing under low concentration while significantly changed concentration, dominated by (70.6% ± 9.7%) (66.1% 18.2%), respectively. 1 was attributed smoke transported over long distances, which provided large amount aerosol particles absorb more locally formed gaseous HNO or 2 5 In this episode, meteorological air quality factors, sources, mechanism did obviously change. Haze caused unfavorable factors enhanced local accumulation. As pollution worsened, pathway shifted OH hydrolysis, primary source vehicle exhaust.

Язык: Английский

Процитировано

1
Evaluating sources and oxidation pathways of nitrate aerosols across altitudes: A year-long study using oxygen isotope anomaly and stable nitrogen isotopic composition from Canton Tower in South China DOI
Yujing Wang,

Chenglei Pei,

Fobang Liu

и другие.

Atmospheric Research, Год журнала: 2025, Номер unknown, С. 107930 - 107930

Опубликована: Янв. 1, 2025

Язык: Английский

Процитировано

1
Dual isotopic evidence of δ15N and δ18O for priority control of vehicle emissions in a megacity of East China: Insight from measurements in summer and winter DOI
Weijie Huang, Xingnan Ye,

Zhixiao Lv

и другие.

The Science of The Total Environment, Год журнала: 2024, Номер 931, С. 172918 - 172918

Опубликована: Апрель 30, 2024

Язык: Английский

Процитировано

5
15N Fractionation of Nitrate Formation Constrained by Dual Oxygen Isotopes Provides Insight Into Its Source Identification in Urban Haze DOI Creative Commons
Xinxin Feng, Yingjun Chen, Peng Yu

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2025, Номер 130(2)

Опубликована: Янв. 13, 2025

Abstract δ 15 N‐NO 3 − is widely used to trace the NO x /NO emission sources without unique source tracers. However, there still controversy regarding N fractionation effects during formation, leading uncertain apportionment. To address this, this study introduces dual oxygen isotopes (∆ 17 O and 18 O) constrain N‐∆ O/∆ N‐δ of formation compare impact (δ on Results found significant differences in ∆ (−3.7 ∼ +16.1‰) (+8.5 +16.2‰) haze, reflecting from three pathways (NO 2 + OH, HC, 5 hydrolysis) two OH hydrolysis), respectively. The value obtained by increases with increase HC contribution (0.02–0.65). Additionally, different results apportionment were ( HC‐induced haze. For example, identified coal combustion (46 ± 8%) biomass burning (32 3%) as major Zibo Conversely, revealed mobile (55 (22 5%) main contributors. Evidence diurnal variation characteristics tracers show that analysis more sensitive accurate than O). These highlight non‐negligible role provide insight into improving tracing techniques for identification through constraint isotopes.

Язык: Английский

Процитировано

0
Application of Stable Isotopes in Identifying the Sources and Formation of Sulfate and Nitrate in PM2.5: A Review DOI Creative Commons
Jinfeng Peng, Cheng Chen, Shanshan Wang

и другие.

Atmosphere, Год журнала: 2024, Номер 15(11), С. 1312 - 1312

Опубликована: Окт. 31, 2024

Sulfate and nitrate are important components of atmospheric PM2.5, which is the main contributor haze. Therefore, studying sources formation mechanisms sulfate very for prevention control haze formation. Stable isotopes nitrate, including isotopic compositions sulfur, oxygen, nitrogen, can be comprehensively used to study pathways in evaluate contribution each source pathway. This paper briefly reviews determination methods oxygen nitrogen focuses on application above identifying puts forward research prospects.

Язык: Английский

Процитировано

1
Refined source apportionment of nitrate aerosols based on isotopes and emission inventories in coastal city of northern China DOI

Yuanzhe Ni,

Li Luo, Shuhan Liu

и другие.

The Science of The Total Environment, Год журнала: 2024, Номер 957, С. 177388 - 177388

Опубликована: Ноя. 18, 2024

Язык: Английский

Процитировано

0
Combination of Multiple Isotopes and PMF Model Provide Insights Into the Method Optimization of PM2.5 Source Apportionment During Haze Episodes DOI
Xinxin Feng, Yingjun Chen, Hongxing Jiang

и другие.

Journal of Geophysical Research Atmospheres, Год журнала: 2024, Номер 129(23)

Опубликована: Ноя. 28, 2024

Abstract The key problems with Positive Matrix Factorization (PMF) model for PM 2.5 source apportionment were inconsistent results different species selections and a lack of evaluation criteria accuracy. Moreover, high proportions secondary inorganic aerosols sources (SNA) identified by PMF without corresponding primary sources. This study develops new method that combines multi‐isotopes ( 34 S, 15 N, 18 O 14 C) to optimize apportionment. Data sets A–F, constructed from components, input into obtain optimal (3–9 factors), which changed the selection species. Specifically, contributions coal combustion (CC, 3%–36%), biomass burning (BB, 11%–38%), vehicle (VS, 4%–15%) showed significant differences in data sets, indicating conventional methods cannot accurate results. Then, introduced restrict reallocate SNA sources, overcoming influence on Additionally, C was used evaluate results, combination more markers (data set F, 9‐factor) techniques obtained optimized aligned Compared initial CC, VS, BB allocated 9‐factor increased 26.4%, 5%, 19.5%, respectively, becoming main . represents first time achieves reapportionment evaluation, improving methods.

Язык: Английский

Процитировано

0