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COSMOGENIC 14CO FOR ASSESSING THE OH-BASED SELF-CLEANING CAPACITY OF THE TROPOSPHERE

Brenninkmeijer, Carl A M and Gromov, Sergey S and Jöckel, Patrick (2021) COSMOGENIC 14CO FOR ASSESSING THE OH-BASED SELF-CLEANING CAPACITY OF THE TROPOSPHERE. Radiocarbon, pp. 1-19. Cambridge University Press. doi: 10.1017/RDC.2021.101. ISSN 0033-8222.

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Abstract

An application of radiocarbon (14C) in atmospheric chemistry is reviewed. 14C produced by cosmic neutrons immediately forms 14CO, which reacts with hydroxyl radicals (OH) to 14CO2. By this the distribution and seasonality (the lifetime of 14CO is ∼1 month) of the pivotal atmospheric oxidant OH can be established. 14CO measurement is a complex but unique application which benefitted enormously from the realization of AMS, bearing in mind that 14CO abundance is of the order of merely 10 molecules per cm3 not only provides 14CO an independent measure for the OH based self-cleansing capacity of the troposphere, but also enabled detection of 14C production due to high energy solar protons in 1989. Although its production takes place throughout the atmosphere and does not have the character of a point source, transport processes in the atmosphere affect the distribution of 14CO. Vertical mixing in the troposphere renders gradients in its production rate less critical, but considerable meridional gradients exist. One question has remained open, namely confirmation of calculated 14C production by direct measurement. A new sampling method is proposed. The conclusions are a guide to future work on 14CO in relation to OH and atmospheric transport.

Item URL in elib:https://elib.dlr.de/146646/
Document Type:Article
Additional Information:Es handelt sich um einen Review Artikel
Title:COSMOGENIC 14CO FOR ASSESSING THE OH-BASED SELF-CLEANING CAPACITY OF THE TROPOSPHERE
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Brenninkmeijer, Carl A MMax Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55218 Mainz, Germanyhttps://orcid.org/0000-0001-7810-7295
Gromov, Sergey SMax Planck Institute for Chemistry, Hahn-Meitner-Weg 1, 55218 Mainz, Germanyhttps://orcid.org/0000-0002-2542-3005
Jöckel, PatrickDLR, IPAhttps://orcid.org/0000-0002-8964-1394
Date:1 December 2021
Journal or Publication Title:Radiocarbon
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
DOI :10.1017/RDC.2021.101
Page Range:pp. 1-19
Publisher:Cambridge University Press
ISSN:0033-8222
Status:Published
Keywords:carbon-14, radiocarbon, atmospheric oxidation capacity, carbon monoxide, hydroxyl radical, OH, troposphere, stratosphere
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Atmospheric and climate research, R - Project Climatic relevance of atmospheric tracer gases, aerosols and clouds, V - Transport und Klima
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Deposited By: Jöckel, Dr. Patrick
Deposited On:02 Dec 2021 12:35
Last Modified:03 Dec 2021 04:34

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