The Chemistry of Nitrate Radical (NO3) and Dinitrogen Pentoxide (N2O5) in Beijing

verfasst von: Haichao Wang

Verlag: Springer Singapore

Buchreihe : Springer Theses

Enthalten in: Springer Professional "Wirtschaft+Technik" , Springer Professional "Technik"

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Über dieses Buch

This book systematically describes the instrument setup for the measurement of nitrate radical (NO3) and dinitrogen pentoxide (N2O5), as well as the mixing ratio, chemical behaviors, and atmospheric impacts of NO3 and N2O5 in Beijing, China. It also discusses the instrument design and data analysis method in detail. Based on several field measurements of NO3 and N2O5 in Beijing, it shows the variation in concentration and the budget of NO3 and N2O5. The N2O5 heterogeneous uptake coefficient was determined using various methods, and the relationship between the N2O5 uptake coefficient and the particle properties was demonstrated, as well as the impact of NO3–N2O5 chemistry to the atmospheric oxidation and the formation of particulate nitrate. These results increase our understanding of nighttime chemistry and provide insights into the role of NO3–N2O5 chemistry in other polluted regions.

Inhaltsverzeichnis

Frontmatter

Chapter 1. Introduction

Abstract

This chapter reviews the background of the atmospheric chemistry of NO₃ and N₂O₅, the field measurement techniques of NO₃ and N₂O₅, the results from laboratory experiments, and field measurement. It summarizes the current research progress and shortcomings of NO₃ and N₂O₅ chemistry. At last, scientific problems and research targets are put forward.

Haichao Wang

Chapter 2. Instrumentation

Abstract

This chapter introduces the homemade instrument of cavity enhanced absorption spectroscopy for measuring NO₃ and N₂O₅ in field studies. The layout of the optical layout and flow system, as well as the sampling loss and sampling efficiency of NO₃ and N₂O₅ in sampling line are characterized by lab experiments. The accuracy and uncertainties of the instrument are analyzed. In the end, the field performance is presented.

Haichao Wang

Chapter 3. Field Measurements

Abstract

This chapter introduces the basic information of the comprehensive field experiment that participated by PKU-CEAS. Four comprehensive field campaigns were conducted in Beijing, which is the Huairou Winter campaign (Huairou, HR), Changping Summer campaign (Changping, CP), Peking University Summer campaign (Peking University, PKUS), and Peking University Winter campaign (PKUW). The four campaigns are ground-based measurements. This chapter systematically summarizes the meteorological conditions, chemical conditions, NO₃ and N₂O₅ concentration levels, and variations in the above four field studies.

Haichao Wang

Chapter 4. NO3 Reactivity and N2O5 Uptake Coefficient

Abstract

Here, ambient NO₃ reactivity is quantified and characterized, the biogenic VOCs dominates NO₃ reactivity during summertime. Ambient N₂O₅ heterogeneous uptake coefficient is derived and predicted by several parameterization schemes. Existing parameterizations are unable to fully predict the variation in N₂O₅ uptake coefficients in Beijing, the key control factors of N₂O₅ uptake processes are discussed.

Haichao Wang

Chapter 5. Atmospheric Impacts

Abstract

This chapter introduces the atmospheric impacts of NO₃ and N₂O₅ chemistry in Beijing. It includes three aspects: (1) It was estimating the NO₃ oxidation and the contribution to atmospheric oxidation. (2) Based on the existing chemical reaction mechanism, quantifying the contribution of each nitrate production pathways by constraining the key parameters, and assessing the effect of N₂O₅ heterogeneous hydrolysis on the formation of particulate nitrate. (3) Evaluating the production of ClNO₂ in winter and look insight into the role of ClNO₂ in photochemistry.

Haichao Wang

Chapter 6. Conclusions and Outlook

Abstract

This chapter gives the conclusions and outlook of this study.

Haichao Wang

Titel: The Chemistry of Nitrate Radical (NO3) and Dinitrogen Pentoxide (N2O5) in Beijing
verfasst von: Haichao Wang
Verlag: Springer Singapore
Electronic ISBN: 978-981-15-8795-5
Print ISBN: 978-981-15-8794-8
DOI: https://doi.org/10.1007/978-981-15-8795-5