Open Access
Four Years of Ground-based MAX-DOAS Observations of HONO and NO2 in the Beijing Area
François Hendrick,J. J. Muller,K. Clémer,M. De Mazière,Caroline Fayt,Christian Hermans,Trissevgeni Stavrakou,T. Vlemmix,Pucai Wang,M. Van Roozendael +9 more
- Vol. 2012
TLDR
In this paper, the seasonal and diurnal cycles of the HONO near-surface concentration are found to be similar in shape and in relative amplitude to the corresponding cycles of HONNO total vertical column densities and are therefore likely driven mainly by the balance between NH sources and the photolytic sink, whereas dilution effects appear to play only a minor role.Abstract:
Ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) measurements of nitrous acid (HONO) and its precursor NO2 (nitrogen dioxide) as well as aerosols have been performed daily in Beijing city centre (39.98° N, 116.38° E) from July 2008 to April 2009 and at the suburban site of Xianghe (39.75° N, 116.96° E) located ~60 km east of Beijing from March 2010 to December 2012. This extensive dataset allowed for the first time the investigation of the seasonal cycle of HONO as well as its diurnal variation in and in the vicinity of a megacity. Our study was focused on the HONO and NO2 near-surface concentrations (0–200 m layer) and total vertical column densities (VCDs) and also aerosol optical depths (AODs) and extinction coefficients retrieved by applying the Optimal Estimation Method to the MAX-DOAS observations. Monthly averaged HONO near-surface concentrations at local noon display a strong seasonal cycle with a maximum in late fall/winter (~0.8 and 0.7 ppb at Beijing and Xianghe, respectively) and a minimum in summer (~0.1 ppb at Beijing and 0.03 ppb at Xianghe). The seasonal cycles of HONO and NO2 appear to be highly correlated, with correlation coefficients in the 0.7–0.9 and 0.5–0.8 ranges at Beijing and Xianghe, respectively. The stronger correlation of HONO with NO2 and also with aerosols observed in Beijing suggests possibly larger role of NO2 conversion into HONO in the Beijing city center than at Xianghe. The observed diurnal cycle of HONO near-surface concentration shows a maximum in the early morning (about 1 ppb at both sites) likely resulting from night-time accumulation, followed by a decrease to values of about 0.1–0.4 ppb around local noon. The HONO / NO2 ratio shows a similar pattern with a maximum in the early morning (values up to 0.08) and a decrease to ~0.01–0.02 around local noon. The seasonal and diurnal cycles of the HONO near-surface concentration are found to be similar in shape and in relative amplitude to the corresponding cycles of the HONO total VCD and are therefore likely driven mainly by the balance between HONO sources and the photolytic sink, whereas dilution effects appear to play only a minor role. The estimation of OH radical production from HONO and O3 photolysis based on retrieved HONO near-surface concentrations and calculated photolysis rates indicate that in the 0–200 m altitude range, HONO is by far the largest source of OH radicals in winter as well as in the early morning at all seasons, while the contribution of O3 dominates in summer from mid-morning until mid-afternoon.read more
Citations
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Journal ArticleDOI
Ozone pollution in China: A review of concentrations, meteorological influences, chemical precursors, and effects
TL;DR: This review summarizes the main findings from published papers on the characteristics and sources and processes of ozone and ozone precursors in the boundary layer of urban and rural areas of China, including concentration levels, seasonal variation, meteorology conducive to photochemistry and pollution transport, key production and loss processes, ozone dependence on nitrogen oxides and volatile organic compounds, and the effects of ozone on crops and human health.
Journal ArticleDOI
Diurnal, seasonal and long-term variations of global formaldehyde columns inferred from combined OMI and GOME-2 observations
I. De Smedt,Trissevgeni Stavrakou,François Hendrick,Thomas Danckaert,T. Vlemmix,Gaia Pinardi,Nicolas Theys,Christophe Lerot,Clio Gielen,Corinne Vigouroux,Christian Hermans,Caroline Fayt,Pepijn Veefkind,Jean-François Müller,M. Van Roozendael +14 more
TL;DR: In this article, the authors present the new version (v14) of the BIRA-IASB algorithm for the retrieval of formaldehyde (H2CO) columns from spaceborne UV-visible sensors.
Journal ArticleDOI
Retrieving tropospheric nitrogen dioxide from the Ozone Monitoring Instrument: effects of aerosols, surface reflectance anisotropy, and vertical profile of nitrogen dioxide
Jintai Lin,Randall V. Martin,Randall V. Martin,K. F. Boersma,K. F. Boersma,Maarten Sneep,Piet Stammes,Robert Spurr,Pucai Wang,M. Van Roozendael,K. Clémer,Hitoshi Irie +11 more
TL;DR: In this article, the authors quantify the influence of aerosol optical effects on the results of the OMI data and propose an improved retrieval process to reduce the interference of aerosols on the retrieved cloud properties and increase the number of valid OMI pixels.
Journal ArticleDOI
Effect of changing NO x lifetime on the seasonality and long-term trends of satellite-observed tropospheric NO 2 columns over China
Viral Shah,Daniel J. Jacob,Ke Li,Rachel F. Silvern,Shixian Zhai,Mengyao Liu,Jintai Lin,Qiang Zhang +7 more
TL;DR: In this article, the seasonality and trends of tropospheric NO2 columns over central-eastern China were analyzed using the GEOS-Chemchemical transport model, and they found no significant trend of the NOx lifetime in summer, supporting the emission trend reported by the MEIC.
Journal ArticleDOI
Ground-based validation of the Copernicus Sentinel-5p TROPOMI NO 2 measurements with the NDACC ZSL-DOAS, MAX-DOAS and Pandonia global networks
Tijl Verhoelst,Steven Compernolle,Gaia Pinardi,Jean-Christopher Lambert,Henk Eskes,Kai Uwe Eichmann,Ann Mari Fjæraa,José Granville,Sander Niemeijer,Alexander Cede,Alexander Cede,Martin Tiefengraber,François Hendrick,Andrea Pazmino,Alkiviadis F. Bais,Ariane Bazureau,K. Folkert Boersma,K. Folkert Boersma,Kristof Bognar,Angelika Dehn,Sebastian Donner,Aleksandr Elokhov,Manuel Gebetsberger,Florence Goutail,Michel Grutter de la Mora,Aleksandr N. Gruzdev,Myrto Gratsea,Georg Hansen,Hitoshi Irie,Nis Jepsen,Yugo Kanaya,Dimitris Karagkiozidis,Rigel Kivi,Karin Kreher,Pieternel F. Levelt,Cheng Liu,Moritz Müller,Monica Navarro Comas,Ankie Piters,Jean-Pierre Pommereau,Thierry Portafaix,C. Prados-Roman,Olga Puentedura,Richard Querel,Julia Remmers,Andreas Richter,J. S. Rimmer,Claudia Rivera Cárdenas,Lidia Saavedra de Miguel,Valery P. Sinyakov,Wolfgang Stremme,Kimberly Strong,Michel Van Roozendael,J. Pepijn Veefkind,Thomas Wagner,Folkard Wittrock,Margarita Yela Gonzalez,Claus Zehner +57 more
TL;DR: In this article, ground-based validation results of the atmospheric NO2 data produced operationally since April 2018 by the TROPOMI instrument on board of the ESA/EU Copernicus Sentinel-5 Precursor (S5p) satellite are compared to correlative measurements collected from, respectively, 19 Multi-Axis DOAS (MAX-DOAS), 26 NDACC Zenith-Scattered-Light DOAS, and 25 PGN/Pandora instruments distributed globally.
References
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Book
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Journal ArticleDOI
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Journal ArticleDOI
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