Ozone exposure alters nutrients and stoichiometric ratios in different organs of four urban tree species despite limited negative effects on leaf physiology and plant growth and biomass DOI Creative Commons
Kun Zhang, Shenglan Li, Shuangjiang Li

и другие.

Journal of Forestry Research, Год журнала: 2025, Номер 36(1)

Опубликована: Фев. 1, 2025

Abstract To better understand the effects of ground-level ozone (O 3 ) on nutrients and stoichiometry in different plant organs, urban tree species Celtis sinensis , Cyclocarya paliurus Quercus acutissima nuttallii were subjected to a constant exposure charcoal-filtered air (CF), nonfiltered (NF), or NF + 40, 60, 80 nmol O mol –1 (NF40, NF60, NF80) starting early summer growing season. At end summer, net CO 2 assimilation rate ( A ), stomatal conductance g s leaf mass per area (LMA), and/or greenness (SPAD) either not significantly affected by elevated even higher some cases during compared with CF controls. LMA was lower autumn only after highest exposures. Compared NF, NF40 caused large increase across late more K Mn stems. season, nutrient status stoichiometric ratios organs variously altered under stress; many changes often species-specific. Across treatments, primarily associated C Mg levels leaves Ca enriched K, P, Fe, stems, relative NF60 enhanced NF40. Moreover, resulted Ca/Mg ratio Q. only, other regimes. Interestingly, species, stress led modifications (stems branches vs leaves). Thus, ambient exposures can alter dynamics distribution disrupt species-specific manner. Changes reflect an important defense mechanism plants pollution adds risk ecological stoichiometries areas.

Язык: Английский

Synergistic PM2.5 and O3 control to address the emerging global PM2.5-O3 compound pollution challenges DOI Creative Commons
Chao He, Jianhua Liu, Yiqi Zhou

и другие.

Eco-Environment & Health, Год журнала: 2024, Номер 3(3), С. 325 - 337

Опубликована: Апрель 19, 2024

In recent years, the issue of PM

Язык: Английский

Процитировано

14
Atmospheric carbonyls in urban Beijing in the summertime under the continuous implementation of clean air actions: decreasing trends, source apportionments and new insights for control strategies DOI
Xin Zhang,

Fang Bi,

Mingzhu Li

и другие.

Journal of Cleaner Production, Год журнала: 2025, Номер unknown, С. 145300 - 145300

Опубликована: Март 1, 2025

Язык: Английский

Процитировано

1
Meteorological impacts on the unexpected ozone pollution in coastal cities of China during the unprecedented hot summer of 2022 DOI

Xiaoting Ji,

Gaojie Chen,

Jinsheng Chen

и другие.

The Science of The Total Environment, Год журнала: 2024, Номер 914, С. 170035 - 170035

Опубликована: Янв. 11, 2024

Язык: Английский

Процитировано

9
Two-decade surface ozone (O3) pollution in China: Enhanced fine-scale estimations and environmental health implications DOI
Zeyu Yang, Zhanqing Li,

Fan Cheng

и другие.

Remote Sensing of Environment, Год журнала: 2024, Номер 317, С. 114459 - 114459

Опубликована: Ноя. 21, 2024

Язык: Английский

Процитировано

8
Extreme weather exacerbates ozone pollution in the Pearl River Delta, China: role of natural processes DOI Creative Commons
Nan Wang, Hongyue Wang, Xin Huang

и другие.

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(2), С. 1559 - 1570

Опубликована: Фев. 1, 2024

Abstract. Ozone (O3) pollution research and management in China have mainly focused on anthropogenic emissions, while the importance of natural processes is often overlooked. With increasing frequency extreme weather events, role exacerbating O3 gaining attention. In September 2022, Pearl River Delta (PRD) southern experienced an extended period (25 d) regional exceedances high temperatures (second highest over last 2 decades) due to conditions influenced by subtropical typhoon peripheries. Employing integrated approach involving field measurements, machine learning numerical model simulations, we investigated impact weather-induced considering meteorological factors, chemistry pathways atmospheric transport. The hot intensified emission biogenic volatile organic compounds (BVOCs) ∼10 %. Isoprene formaldehyde accounted for 47 % situ production, underscoring predominant BVOC emissions processes. chemical pathway isoprene contributing formation was further explored, with production more attributable degradation early generation oxidation products (contributed 64.5 %) than direct itself 35.5 %). Besides, it found that significantly promoted photochemical reactions, factors additional 10.8 ppb levels compared normal conditions. Temperature identified as dominant factor. Furthermore, nearing landfall enhanced cross-regional transport from northern through stratosphere–troposphere exchange (STE). CAM-Chem simulations revealed STE-induced PRD surface could reach a maximum ∼8 ppb, highlighting non-negligible STE. This study highlights exacerbated events provides valuable insights into control under global warming.

Язык: Английский

Процитировано

7
Ozone trends and their sensitivity in global megacities under the warming climate DOI Creative Commons
Jairo Vázquez Santiago, Hiroo Hata,

Edgar J. Martinez-Noriega

и другие.

Nature Communications, Год журнала: 2024, Номер 15(1)

Опубликована: Ноя. 26, 2024

Tropospheric ozone formation depends on the emissions of volatile organic compounds (VOC) and nitrogen oxides (NOx). In megacities, abundant VOC NOx sources cause relentlessly high episodes, affecting a large share global population. This study uses data from Ozone Monitoring Instrument for formaldehyde (HCHO) dioxide (NO2) as proxy emissions, respectively, with their ratio serving an indicator sensitivity. Ground-level (O3) reanalysis Copernicus Atmosphere is used to assess O3 trends. We evaluate changes 2005 2019 relationship warming environment in 41 megacities worldwide, applying seasonal Mann-Kendall, trend decomposition methods, Pearson correlation analysis. reveal significant increases HCHO (0.1 0.31 × 1015 mol cm−2 year−1) regionally varying NO2 (−0.22 0.07 year−1). trends range −0.31 0.70 ppb year−1, highlighting relevance precursor abundance levels. The strong between increasing temperature suggests that will continue rise climate change persists. Satellite observations dioxide, key species contributing formation, rising temperatures are driving increased levels globally urban remote environments

Язык: Английский

Процитировано

7
Constructing the 3D Spatial Distribution of the HCHO/NO2 Ratio via Satellite Observation and Machine Learning Model DOI

Zhiwen Jiang,

Shanshan Wang, Yuhao Yan

и другие.

Environmental Science & Technology, Год журнала: 2025, Номер unknown

Опубликована: Фев. 20, 2025

The satellite-based tropospheric column ratio of HCHO to NO2 (FNR) is widely used diagnose ozone formation sensitivity; however, its representation surface conditions remains controversial. In this study, an approach construct the 3D spatial distribution FNR in lower troposphere was proposed. Based on satellite and multiaxes-differential Optical Absorption Spectroscopy (MAX-DOAS) data, horizontal vertical distributions have been respectively obtained. To further enhance generalizability approach, we also reproduced profiles using a machine learning model (Bagged trees) feature variables. Here, three-dimensional during summer 2019 as example, fourth-order polynomial relationship found between reconstruction factors (fcol_i) altitudes, demonstrating correlation coefficient 0.98. Utilizing established relationship, significant difference reconstructed FNR, with former decreasing by 56.9%. Moreover, for summers from 2018 2022 revealed trend over five years Shanghai control regimes gradually shifting toward transition NOx-limited regimes. Through newly not only can accuracy identifying sensitivity be enhanced spaced observation, but it helps gaining comprehensive understanding photochemical mechanisms direction.

Язык: Английский

Процитировано

1
Photochemical oxidation of VOCs and their source impact assessment on ozone under de-weather conditions in Western Taiwan DOI
Manisha Mishra,

Pin-Hsin Chen,

Guan-Yu Lin

и другие.

Environmental Pollution, Год журнала: 2024, Номер 346, С. 123662 - 123662

Опубликована: Фев. 26, 2024

Язык: Английский

Процитировано

6
Identifying the geospatial relationship of surface ozone pollution in China: Implications for key pollution control regions DOI
Yong Cheng, Peng Yan, Li‐Ming Cao

и другие.

The Science of The Total Environment, Год журнала: 2024, Номер 930, С. 172763 - 172763

Опубликована: Апрель 24, 2024

Язык: Английский

Процитировано

6
Changes in South American surface ozone trends: exploring the influences of precursors and extreme events DOI Creative Commons
Rodrigo Seguel, Lucas Castillo, Charlie Opazo

и другие.

Atmospheric chemistry and physics, Год журнала: 2024, Номер 24(14), С. 8225 - 8242

Опубликована: Июль 22, 2024

Abstract. In this study, trends of 21st-century ground-level ozone and precursors were examined across South America, a less-studied region where trend estimates have rarely been comprehensively addressed. Therefore, we provided an updated regional analysis based on validated surface observations. We tested the hypothesis that recent increasing trends, mostly in urban environments, resulted from intense wildfires driven by extreme meteorological events impacting cities preexisting volatile organic compound (VOC)-limited regimes dominate. applied quantile regression method monthly anomalies to estimate quantify their uncertainties detect change points. Additionally, maximum daily 8 h average (MDA8) peak-season metrics used assess short- long-term exposure levels, respectively, for present day (2017–2021). Our results showed lower levels tropical (Bogotá Quito), varying between 39 43 nmol mol−1 short-term 26 27 exposure. contrast, mixing ratios higher extratropical (Santiago São Paulo), with level 61 40 41 mol−1. Santiago (since 2017) Paulo 2008) exhibited positive 0.6 0.3 yr−1, very high certainty. attributed these upward or no evidence variation, such as Bogotá Quito, well-established VOC-limited regime. However, greater increase percentile (≥ 90th) heat waves and, case southwestern associated events.

Язык: Английский

Процитировано

6