One-decade trend analysis of stratospheric BrO over Harestua (60°N) and Lauder (45°S) reveals a decline

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Authors
Hendrick, F.
Johnston, P.V.
De Mazière, M.
Fayt, C.
Hermans, C.
Kreher, K.
Theys, N.
Thomas, A.
Van Roozendael, M.
Discipline
Physical sciences
Subject
Network protocols
Sulfur compounds
Troposphere
Brominated substances
Ground-based
Inorganic bromine
Mean age of air
Montreal protocol
Trend analysis
Uv-visible
Very short-lived substances
Bromine
air quality
atmospheric chemistry
bromine
decadal variation
ground-based measurement
Montreal Protocol
stratosphere
trend analysis
troposphere
Australasia
Eurasia
Europe
Harestua
Lauder
New Zealand
Northern Europe
Norway
Oppland
Otago
Scandinavia
South Island
Audience
Scientific
Date
2008Metadata
Show full item recordDescription
A trend analysis is performed of stratospheric BrO from ground-based UV-visible observations at Harestua (60°N, 11°E) and Lauder (45°S, 170°E) from 1995 through 2005. At both stations, a positive trend of about +2.5% per year is found for the 1995-2001 period, while a negative trend of about -1% per year is obtained between 2001 and 2005. Given a mean age of air of about 4 ± 1 years, the decline in stratospheric bromine since 2002 follows the decline of tropospheric organic bromine observed since the second half of 1998, as a result of the Montreal Protocol. These findings confirm that the impact of the Montreal Protocol restrictions on brominated substances have now reached the stratosphere. From our study, we have also derived a contribution of 6 ± 4 ppt of the brominated very short-lived substances and inorganic bromine tropospheric sources to the total bromine loading.
Citation
Hendrick, F.; Johnston, P.V.; De Mazière, M.; Fayt, C.; Hermans, C.; Kreher, K.; Theys, N.; Thomas, A.; Van Roozendael, M. (2008). One-decade trend analysis of stratospheric BrO over Harestua (60°N) and Lauder (45°S) reveals a decline. , Geophysical Research Letters, Vol. 35, Issue 14, L14801, DOI: 10.1029/2008GL034154.Identifiers
scopus: 2-s2.0-53749083832
Type
Article
Peer-Review
Yes
Language
eng