Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials
Methyl bromide (CH3Br) supplies about half of the chemically active bromine (Bry) in the stratosphere. Efforts to control Bry-catalyzed ozone depletion by phasing out, for example, agricultural use of CH3Br may be thwarted by a lack of understanding of how the varied biogeochemical processes interac...
Published in: | Global Biogeochemical Cycles |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
eScholarship, University of California
1997
|
Subjects: | |
Online Access: | http://www.escholarship.org/uc/item/0x5622vh |
id |
ftcdlib:qt0x5622vh |
---|---|
record_format |
openpolar |
spelling |
ftcdlib:qt0x5622vh 2023-05-15T14:03:06+02:00 Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials Prather, Michael J 393 - 400 1997-09-01 application/pdf http://www.escholarship.org/uc/item/0x5622vh english eng eScholarship, University of California qt0x5622vh http://www.escholarship.org/uc/item/0x5622vh Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ CC-BY Prather, Michael J. (1997). Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials. Global Biogeochemical Cycles, 11(3), 393 - 400. doi:10.1029/97GB01055. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/0x5622vh Physical Sciences and Mathematics stratospheric ozone methyl-bromide time sink BrO Antarctica chlorine lifetime cycle article 1997 ftcdlib https://doi.org/10.1029/97GB01055 2016-04-02T18:23:12Z Methyl bromide (CH3Br) supplies about half of the chemically active bromine (Bry) in the stratosphere. Efforts to control Bry-catalyzed ozone depletion by phasing out, for example, agricultural use of CH3Br may be thwarted by a lack of understanding of how the varied biogeochemical processes interact as a coupled system: in addition to the chemical industry, large natural sources come from the ocean; and losses occur in the atmosphere, ocean, and soils. A simplified one-dimensional stratosphere-troposphere-ocean model for {CH3Br, Bry} that fits current understanding of sources and sinks is analyzed in terms of natural modes. Surface and ocean sources have effectively different steady state lifetimes (1.0 and 0.5 years, respectively), but the natural-mode decay times of the system (1.8 years for CH3Br and 4.5 years for stratospheric Bry) do not depend on the location of sources. The cumulative ozone depletion resulting from a single atmospheric release of CH3Br integrates over the consequent slow rise and fall of Bry in the lower stratosphere. Thus, in spite of the 1-year lifetime of CH3Br, only half of the anticipated ozone recovery occurs in the first 7 years. Article in Journal/Newspaper Antarc* Antarctica University of California: eScholarship Global Biogeochemical Cycles 11 3 393 400 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
English |
topic |
Physical Sciences and Mathematics stratospheric ozone methyl-bromide time sink BrO Antarctica chlorine lifetime cycle |
spellingShingle |
Physical Sciences and Mathematics stratospheric ozone methyl-bromide time sink BrO Antarctica chlorine lifetime cycle Prather, Michael J Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
topic_facet |
Physical Sciences and Mathematics stratospheric ozone methyl-bromide time sink BrO Antarctica chlorine lifetime cycle |
description |
Methyl bromide (CH3Br) supplies about half of the chemically active bromine (Bry) in the stratosphere. Efforts to control Bry-catalyzed ozone depletion by phasing out, for example, agricultural use of CH3Br may be thwarted by a lack of understanding of how the varied biogeochemical processes interact as a coupled system: in addition to the chemical industry, large natural sources come from the ocean; and losses occur in the atmosphere, ocean, and soils. A simplified one-dimensional stratosphere-troposphere-ocean model for {CH3Br, Bry} that fits current understanding of sources and sinks is analyzed in terms of natural modes. Surface and ocean sources have effectively different steady state lifetimes (1.0 and 0.5 years, respectively), but the natural-mode decay times of the system (1.8 years for CH3Br and 4.5 years for stratospheric Bry) do not depend on the location of sources. The cumulative ozone depletion resulting from a single atmospheric release of CH3Br integrates over the consequent slow rise and fall of Bry in the lower stratosphere. Thus, in spite of the 1-year lifetime of CH3Br, only half of the anticipated ozone recovery occurs in the first 7 years. |
format |
Article in Journal/Newspaper |
author |
Prather, Michael J |
author_facet |
Prather, Michael J |
author_sort |
Prather, Michael J |
title |
Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
title_short |
Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
title_full |
Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
title_fullStr |
Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
title_full_unstemmed |
Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials |
title_sort |
timescales in atmospheric chemistry: ch 3 br, the ocean, and ozone depletion potentials |
publisher |
eScholarship, University of California |
publishDate |
1997 |
url |
http://www.escholarship.org/uc/item/0x5622vh |
op_coverage |
393 - 400 |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Prather, Michael J. (1997). Timescales in atmospheric chemistry: CH 3 Br, the ocean, and ozone depletion potentials. Global Biogeochemical Cycles, 11(3), 393 - 400. doi:10.1029/97GB01055. UC Irvine: Department of Earth System Science, UCI. Retrieved from: http://www.escholarship.org/uc/item/0x5622vh |
op_relation |
qt0x5622vh http://www.escholarship.org/uc/item/0x5622vh |
op_rights |
Attribution (CC BY): http://creativecommons.org/licenses/by/3.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/97GB01055 |
container_title |
Global Biogeochemical Cycles |
container_volume |
11 |
container_issue |
3 |
container_start_page |
393 |
op_container_end_page |
400 |
_version_ |
1766273634732605440 |