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  • TOAR; Tropospheric Ozone Assessment Report  (1)
  • heterogenous chemistry  (1)
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  • 1
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    Insights Into NOx and HONO Chemistry in the Tropical Marine Boundary Layer at Cape Verde During the MarParCloud Campaign (2023)
    Details
    Publikationsdatum: 2023-11-15
    Beschreibung: 〈title xmlns:mml="http://www.w3.org/1998/Math/MathML"〉Abstract〈/title〉〈p xmlns:mml="http://www.w3.org/1998/Math/MathML" xml:lang="en"〉Chemical processing of reactive nitrogen species, especially of NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 (= NO + NO〈sub〉2〈/sub〉) and nitrous acid (HONO), determines the photochemical ozone production and oxidation capacity in the troposphere. However, sources of HONO and NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 in the remote marine atmosphere are still poorly understood. In this work, the multiphase chemistry mechanism CAPRAM in the model framework SPACCIM was used to study HONO formation at Cape Verde (CVAO) in October 2017, adopted with the input of current parameterizations for various HONO sources. Three simulations were performed that adequately reproduced ambient HONO levels and its diurnal pattern. The model performance for NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 and O〈sub〉3〈/sub〉 improves significantly when considering dust‐surface‐photocatalytic conversions of reactive nitrogen compounds with high correlation coefficients up to 0.93, 0.56, and 0.89 for NO, NO〈sub〉2〈/sub〉, and O〈sub〉3〈/sub〉, respectively. Photocatalytic conversion of the adsorbed HNO〈sub〉3〈/sub〉 on dust is modeled to be the predominant contributor for daytime HONO at CVAO, that is, accounting for about 62% of the chemical formation rate at noontime. In contrast, the ocean‐surface‐mediated conversion of NO〈sub〉2〈/sub〉 to HONO and other discussed pathways are less important. The average OH levels at midday (9:00–16:00) modeled for cluster trajectory 1, 2, and 3 are 5.2, 5.1, and 5.2 × 10〈sup〉6〈/sup〉 molecules cm〈sup〉−3〈/sup〉, respectively. Main OH formation is driven by O〈sub〉3〈/sub〉 photolysis with a contribution of 74.6% to the total source rate, while HONO photolysis is negligible (∼1.8%). In summary, this study highlights the key role of dust aerosols for HONO formation and NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 cycling at CVAO and possibly in other dust‐affected regions, urgently calling for further investigations using field and model studies.〈/p〉
    Beschreibung: Plain Language Summary: Chemical processing of NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 (= NO + NO〈sub〉2〈/sub〉) and nitrous acid (HONO) is important for the tropospheric O〈sub〉3〈/sub〉 budget and oxidation capacity. However, the sources of HONO and cycling of NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 in the remote marine atmosphere are still poorly explored. A detailed multiphase chemistry model simulation showed a better performance of HONO, NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 and O〈sub〉3〈/sub〉 when considering dust‐surface‐photocatalytic conversions of reactive nitrogen compounds, especially the photocatalytic conversion of the adsorbed HNO〈sub〉3〈/sub〉 on dust. The simulations demonstrated that OH formation is mainly driven by the O〈sub〉3〈/sub〉 photolysis, while HONO photolysis is a negligible OH radical source due to its low concentration levels at Cape Verde. The study highlights the key role of dust aerosols for HONO and NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 chemistry in the remote marine boundary layer.〈/p〉
    Beschreibung: Key Points: 〈list list-type="bullet"〉 〈list-item〉 〈p xml:lang="en"〉The sources of HONO and NO〈sub〉〈italic〉x〈/italic〉〈/sub〉 at Cape Verde are well modeled with CAPRAM〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Photocatalytic conversion of adsorbed HNO〈sub〉3〈/sub〉 on dust is the predominant contributor for daytime HONO〈/p〉〈/list-item〉 〈list-item〉 〈p xml:lang="en"〉Photolysis of O〈sub〉3〈/sub〉 is the prevailing source of OH radical at Cape Verde, while HONO photolysis is a negligible OH radical source〈/p〉〈/list-item〉 〈/list〉 〈/p〉
    Beschreibung: Leibniz Association SAW
    Beschreibung: Horizon 2020 Framework Programme http://dx.doi.org/10.13039/100010661
    Beschreibung: National Key Research and Development Program of China http://dx.doi.org/10.13039/501100012166
    Beschreibung: National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809
    Beschreibung: https://doi.org/10.5281/zenodo.8070265
    Beschreibung: http://mcm.york.ac.uk/
    Beschreibung: https://capram.tropos.de/
    Beschreibung: https://ebas.nilu.no/
    Beschreibung: https://www.ready.noaa.gov/HYSPLIT_traj.php
    Schlagwort(e): ddc:551 ; HONO ; NOx ; CAPRAM ; heterogenous chemistry ; mineral dust ; OH radical ; marine boundary layer
    Sprache: Englisch
    Materialart: doc-type:article
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    CITATION GEO-LEO
  • 2
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    Unbekannt
    Tropospheric Ozone Assessment Report, links to Global surface ozone datasets (2017)
    PANGAEA
    In:  Supplement to: Schultz, Martin G; Schröder, Sabine; Lyapina, Olga; Cooper, Owen R; Galbally, Ian; Petropavlovskikh, Irina; von Schneidemesser, Erika; Tanimoto, Hiroshi; Elshorbany, Yasin; Naja, Manish; Seguel, Rodrigo J; Dauert, Ute; Eckhardt, Paul; Feigenspan, Stefan; Fiebig, Markus; Hjellbrekke, Anne-Gunn; Hong, You-Deog; Kjeld, Peter Christian; Koide, Hiroshi; Lear, Gary; Tarasick, David; Ueno, Mikio; Wallasch, Markus; Baumgardner, Darrel; Chuang, Ming-Tung; Gillett, Robert; Lee, Meehye; Molloy, Suzie; Moolla, Raeesa; Wang, Tao; Sharps, Katrina; Adame, Jose A; Ancellet, Gerard; Apadula, Francesco; Artaxo, Paulo; Barlasina, Maria E; Bogucka, Magdalena; Bonasoni, Paolo; Chang, Limseok; Colomb, Aurelie; Cuevas-Agulló, Emilio; Cupeiro, Manuel; Degorska, Anna; Ding, Aijun; Fröhlich, Marina; Frolova, Marina; Gadhavi, Harish; Gheusi, Francois; Gilge, Stefan; Gonzalez, Margarita Y; Gros, Valérie; Hamad, Samera H; Helmig, Detlev; Henriques, Diamantino; Hermansen, Ove; Holla, Robert; Hueber, Jacques; Im, Ulas; Jaffe, Daniel A; Komala, Ninong; Kubistin, Dagmar; Lam, Ka-Se; Laurila, Tuomas; Lee, Haeyoung; Levy, Ilan; Mazzoleni, Claudio; Mazzoleni, Lynn R; McClure-Begley, Audra; Mohamad, Maznorizan; Murovec, Marijana; Navarro-Comas, Monica; Nicodim, Florin; Parrish, David; Read, Katie Alana; Reid, Nick; Ries, Ludwig; Saxena, Pallavi; Schwab, James J; Scorgie, Yvonne; Senik, Irina; Simmonds, Peter; Sinha, Vinayak; Skorokhod, Andrey I; Spain, Gerard; Spangl, Wolfgang; Spoor, Ronald; Springston, Stephen R; Steer, Kelvyn; Steinbacher, Martin; Suharguniyawan, Eka; Torre, Paul; Trickl, Thomas; Weili, Lin; Weller, Rolf; Xu, Xiaobin; Xue, Likun; Ma, Zhiqiang (2017): Tropospheric Ozone Assessment Report: Database and Metrics Data of Global Surface Ozone Observations. Elementa - Science of the Anthropocene, 5:58, 26 pp, https://doi.org/10.1525/elementa.244
    Details
    Publikationsdatum: 2023-11-18
    Beschreibung: In support of the first Tropospheric Ozone Assessment Report (TOAR) a relational database of global surface ozone observations has been developed and populated with hourly measurement data and enhanced metadata. A comprehensive suite of ozone metrics products including standard statistics, health and vegetation impact metrics, and trend information, are made available through a common data portal and a web interface. These data form the basis of the TOAR analyses focusing on human health, vegetation, and climate relevant ozone issues, which are part of this special feature. By combining the data from almost 10,000 measurement sites around the world with global metadata information, new analyses of surface ozone have become possible, such as the first globally consistent characterisations of measurement sites as either urban or rural/remote. Exploitation of these global metadata allow for new insights into the global distribution, and seasonal and long-term changes of tropospheric ozone. Cooperation among many data centers and individual researchers worldwide made it possible to build the world's largest collection of in-situ hourly surface ozone data covering the period from 1970 to 2015. Considerable effort was made to harmonize and synthesize data formats and metadata information from various networks and individual data submissions. Extensive quality control was applied to identify questionable and erroneous data, including changes in apparent instrument offsets or calibrations. Such data were excluded from TOAR data products. Limitations of a posteriori data quality assurance are discussed. As a result of the work presented here, global coverage of surface ozone data has been significantly extended. Yet, large gaps remain in the surface observation network both in terms of regions without monitoring, and in terms of regions that have monitoring programs but no public access to the data archive. Therefore future improvements to the database will require not only improved data harmonization, but also expanded data sharing and increased monitoring in data-sparse regions.
    Schlagwort(e): TOAR; Tropospheric Ozone Assessment Report
    Materialart: Dataset
    Format: application/zip, 7 datasets
    Standort Signatur Erwartet Verfügbarkeit
    BibTip Andere fanden auch interessant ...
    DATEN PANGAEA
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