The use of δ13C in CO to determine removal of CH4 by Cl radicals in the atmosphere
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The use of δ13C in CO to determine removal of CH4 by Cl radicals in the atmosphere. / Röckmann, Thomas; van Herpen, Maarten; Brashear, Chloe; van der Veen, Carina; Gromov, Sergey; Li, Qinyi; Saiz-Lopez, Alfonso; Meidan, Daphne; Barreto, Africa; Prats, Natalia; Mármol, Ignacio; Ramos, Ramón; Baños, Isabel; Arrieta, Jesús M.; Zaehnle, Sönke; Jordan, Armin; Moossen, Heiko; Timas, Helder; Young, Dickon; Sperlich, Peter; Moss, Rowena; Johnson, Matthew S.
I: Environmental Research Letters, Bind 19, Nr. 6, 064054, 2024.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - The use of δ13C in CO to determine removal of CH4 by Cl radicals in the atmosphere
AU - Röckmann, Thomas
AU - van Herpen, Maarten
AU - Brashear, Chloe
AU - van der Veen, Carina
AU - Gromov, Sergey
AU - Li, Qinyi
AU - Saiz-Lopez, Alfonso
AU - Meidan, Daphne
AU - Barreto, Africa
AU - Prats, Natalia
AU - Mármol, Ignacio
AU - Ramos, Ramón
AU - Baños, Isabel
AU - Arrieta, Jesús M.
AU - Zaehnle, Sönke
AU - Jordan, Armin
AU - Moossen, Heiko
AU - Timas, Helder
AU - Young, Dickon
AU - Sperlich, Peter
AU - Moss, Rowena
AU - Johnson, Matthew S.
N1 - Publisher Copyright: © 2024 The Author(s). Published by IOP Publishing Ltd
PY - 2024
Y1 - 2024
N2 - The reaction of CH4 with chlorine (Cl) radicals in the atmosphere is associated with an extraordinarily strong isotopic fractionation, where 12CH4 reacts about 70 ‰ faster with Cl than 13CH4. Therefore, although the Cl-based sink of CH4 constitutes only a small contribution to its total removal rate, the uncertainty in this small sink has been identified as one of the two largest uncertainties of isotope-based CH4 source apportionment at the global scale. The uncertainty arises from the fact that Cl levels in the atmosphere are so low that they cannot be detected directly. One very sensitive indirect method to identify and quantify the CH4 + Cl reaction in the atmosphere is the detection of the extremely 13C-depleted reaction product carbon monoxide (CO) from this reaction. This article reviews the concept of this approach, its successful application in the atmosphere, its challenges and opportunities for identifying and quantifying Cl-based removal of CH4 at the regional and global scale and its potential to detect and evaluate possible attempts to enhance CH4 removal from the atmosphere.
AB - The reaction of CH4 with chlorine (Cl) radicals in the atmosphere is associated with an extraordinarily strong isotopic fractionation, where 12CH4 reacts about 70 ‰ faster with Cl than 13CH4. Therefore, although the Cl-based sink of CH4 constitutes only a small contribution to its total removal rate, the uncertainty in this small sink has been identified as one of the two largest uncertainties of isotope-based CH4 source apportionment at the global scale. The uncertainty arises from the fact that Cl levels in the atmosphere are so low that they cannot be detected directly. One very sensitive indirect method to identify and quantify the CH4 + Cl reaction in the atmosphere is the detection of the extremely 13C-depleted reaction product carbon monoxide (CO) from this reaction. This article reviews the concept of this approach, its successful application in the atmosphere, its challenges and opportunities for identifying and quantifying Cl-based removal of CH4 at the regional and global scale and its potential to detect and evaluate possible attempts to enhance CH4 removal from the atmosphere.
KW - CH
KW - Cl
KW - CO
KW - δ C
U2 - 10.1088/1748-9326/ad4375
DO - 10.1088/1748-9326/ad4375
M3 - Journal article
AN - SCOPUS:85195630984
VL - 19
JO - Environmental Research Letters
JF - Environmental Research Letters
SN - 1748-9326
IS - 6
M1 - 064054
ER -
ID: 395143998