A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site

Thomas J. Bannan; M. Anwar H. Khan; Michael Le Breton; Michael Priestley; Stephen D Worrall; Asan Bacak; Nicholas Marsden; Douglas Lowe; Joseph Pitt; Grant Allen; David Topping; Hugh Coe; Gordon McFiggans; Dudley E. Shallcross; Carl J. Percival

doi:10.1029/2019GL083764

A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site

Thomas J. Bannan, M. Anwar H. Khan, Michael Le Breton, Michael Priestley, Stephen D Worrall, Asan Bacak, Nicholas Marsden, Douglas Lowe, Joseph Pitt, Grant Allen, David Topping, Hugh Coe, Gordon McFiggans, Dudley E. Shallcross, Carl J. Percival

Research output: Contribution to journal › Article › peer-review

Abstract

Nitryl chloride (ClNO ₂) acts as a source of highly reactive chlorine atoms as well as an important NO _x reservoir. Measurements of ClNO ₂ at an operational U.K. landfill site are reported here for the first time. A peak concentration of 4 ppb of ClNO ₂ was found with a peak mean nighttime maximum of 0.9 ppb. Using models based upon the photolysis of observed ClNO ₂ and atmospheric chlorine chemistry, chlorine atom concentrations reaching in excess of 1.20 × 10 ⁵ molecules/cm ³ in the early morning following sunrise are calculated. These concentrations are approximately 10 times higher than previously reported in the United Kingdom, suggesting a significant impact on the oxidizing capacity around such sites. Given the ubiquity of landfill sites regionally and globally, and the large abundances of Cl atoms from the photolysis of ClNO ₂, chlorine chemistry has a significant impact on ozone formation and volatile organic compounds oxidation as shown by WRF-Chem modeling.

Original language	English
Pages (from-to)	8508-8516
Number of pages	9
Journal	Geophysical Research Letters
Volume	46
Issue number	14
Early online date	29 Jul 2019
DOIs	https://doi.org/10.1029/2019GL083764
Publication status	Published - 12 Aug 2019

Bibliographical note

©2019. The Authors.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Keywords

CIMS
ClNO
landfill

Access to Document

10.1029/2019GL083764Licence: CC BY 3.0

A Large Source of Atomic Chlorine From ClNO2 Photolysis at a U.K. Landfill SiteFinal published version, 1.38 MBLicence: CC BY 3.0

Cite this

Bannan, T. J., Khan, M. A. H., Breton, M. L., Priestley, M., Worrall, S. D., Bacak, A., Marsden, N., Lowe, D., Pitt, J., Allen, G., Topping, D., Coe, H., McFiggans, G., Shallcross, D. E., & Percival, C. J. (2019). A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site. Geophysical Research Letters, 46(14), 8508-8516. https://doi.org/10.1029/2019GL083764

@article{95045dcbca7a43eeafee1be91586622a,

title = "A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site",

abstract = "Nitryl chloride (ClNO 2) acts as a source of highly reactive chlorine atoms as well as an important NO x reservoir. Measurements of ClNO 2 at an operational U.K. landfill site are reported here for the first time. A peak concentration of 4 ppb of ClNO 2 was found with a peak mean nighttime maximum of 0.9 ppb. Using models based upon the photolysis of observed ClNO 2 and atmospheric chlorine chemistry, chlorine atom concentrations reaching in excess of 1.20 × 10 5 molecules/cm 3 in the early morning following sunrise are calculated. These concentrations are approximately 10 times higher than previously reported in the United Kingdom, suggesting a significant impact on the oxidizing capacity around such sites. Given the ubiquity of landfill sites regionally and globally, and the large abundances of Cl atoms from the photolysis of ClNO 2, chlorine chemistry has a significant impact on ozone formation and volatile organic compounds oxidation as shown by WRF-Chem modeling. ",

keywords = "CIMS, ClNO, landfill",

author = "Bannan, {Thomas J.} and Khan, {M. Anwar H.} and Breton, {Michael Le} and Michael Priestley and Worrall, {Stephen D} and Asan Bacak and Nicholas Marsden and Douglas Lowe and Joseph Pitt and Grant Allen and David Topping and Hugh Coe and Gordon McFiggans and Shallcross, {Dudley E.} and Percival, {Carl J.}",

note = "{\textcopyright}2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.",

year = "2019",

month = aug,

day = "12",

doi = "10.1029/2019GL083764",

language = "English",

volume = "46",

pages = "8508--8516",

journal = "Geophysical Research Letters",

issn = "0094-8276",

publisher = "American Geophysical Union",

number = "14",

}

TY - JOUR

T1 - A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site

AU - Bannan, Thomas J.

AU - Khan, M. Anwar H.

AU - Breton, Michael Le

AU - Priestley, Michael

AU - Worrall, Stephen D

AU - Bacak, Asan

AU - Marsden, Nicholas

AU - Lowe, Douglas

AU - Pitt, Joseph

AU - Allen, Grant

AU - Topping, David

AU - Coe, Hugh

AU - McFiggans, Gordon

AU - Shallcross, Dudley E.

AU - Percival, Carl J.

N1 - ©2019. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

PY - 2019/8/12

Y1 - 2019/8/12

N2 - Nitryl chloride (ClNO 2) acts as a source of highly reactive chlorine atoms as well as an important NO x reservoir. Measurements of ClNO 2 at an operational U.K. landfill site are reported here for the first time. A peak concentration of 4 ppb of ClNO 2 was found with a peak mean nighttime maximum of 0.9 ppb. Using models based upon the photolysis of observed ClNO 2 and atmospheric chlorine chemistry, chlorine atom concentrations reaching in excess of 1.20 × 10 5 molecules/cm 3 in the early morning following sunrise are calculated. These concentrations are approximately 10 times higher than previously reported in the United Kingdom, suggesting a significant impact on the oxidizing capacity around such sites. Given the ubiquity of landfill sites regionally and globally, and the large abundances of Cl atoms from the photolysis of ClNO 2, chlorine chemistry has a significant impact on ozone formation and volatile organic compounds oxidation as shown by WRF-Chem modeling.

AB - Nitryl chloride (ClNO 2) acts as a source of highly reactive chlorine atoms as well as an important NO x reservoir. Measurements of ClNO 2 at an operational U.K. landfill site are reported here for the first time. A peak concentration of 4 ppb of ClNO 2 was found with a peak mean nighttime maximum of 0.9 ppb. Using models based upon the photolysis of observed ClNO 2 and atmospheric chlorine chemistry, chlorine atom concentrations reaching in excess of 1.20 × 10 5 molecules/cm 3 in the early morning following sunrise are calculated. These concentrations are approximately 10 times higher than previously reported in the United Kingdom, suggesting a significant impact on the oxidizing capacity around such sites. Given the ubiquity of landfill sites regionally and globally, and the large abundances of Cl atoms from the photolysis of ClNO 2, chlorine chemistry has a significant impact on ozone formation and volatile organic compounds oxidation as shown by WRF-Chem modeling.

KW - CIMS

KW - ClNO

KW - landfill

UR - https://agupubs.onlinelibrary.wiley.com/doi/full/10.1029/2019GL083764

UR - http://www.scopus.com/inward/record.url?scp=85070334566&partnerID=8YFLogxK

U2 - 10.1029/2019GL083764

DO - 10.1029/2019GL083764

M3 - Article

SN - 0094-8276

VL - 46

SP - 8508

EP - 8516

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 14

ER -

A large source of atomic chlorine from ClNO2 photolysis at a UK landfill site

Abstract

Bibliographical note

Keywords

Access to Document

Other files and links

Fingerprint

Cite this