Positive trends in Southern Hemisphere carbonyl sulfide
Transport of carbonyl sulfide (OCS) from the troposphere to the stratosphere contributes sulfur to the stratospheric aerosol layer, which reflects incoming short‐wave solar radiation, cooling the climate system. Previous analyses of OCS observations have shown no significant trend, suggesting that O...
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Published in | Geophysical research letters Vol. 42; no. 21; pp. 9473 - 9480 |
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Main Authors | , , , , , , |
Format | Journal Article Web Resource |
Language | English |
Published |
Washington
Blackwell Publishing Ltd
16.11.2015
John Wiley & Sons, Inc American Geophysical Union |
Subjects | |
Online Access | Get full text |
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Summary: | Transport of carbonyl sulfide (OCS) from the troposphere to the stratosphere contributes sulfur to the stratospheric aerosol layer, which reflects incoming short‐wave solar radiation, cooling the climate system. Previous analyses of OCS observations have shown no significant trend, suggesting that OCS is unlikely to be a major contributor to the reported increases in stratospheric aerosol loading and indicating a balanced OCS budget. Here we present analyses of ground‐based Fourier transform spectrometer measurements of OCS at three Southern Hemisphere sites spanning 34.45°S to 77.80°S. At all three sites statistically significant positive trends are seen from 2001 to 2014 with an observed overall trend in total column OCS at Wollongong of 0.73 ± 0.03%/yr, at Lauder of 0.43 ± 0.02%/yr, and at Arrival Heights of 0.45 ± 0.05%/yr. These observed trends in OCS imply that the OCS budget is not balanced and could contribute to constraints on current estimates of sources and sinks.
Key Points
First observed positive trend in OCS in the Southern Hemisphere
Observed trends indicate imbalanced OCS budget
Temporal structure of trend is similar across middle‐ and high‐latitude sites |
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Bibliography: | ark:/67375/WNG-CHZ683ST-2 ArticleID:GRL53642 Australian Research Council - No. DP110101948; No. LE0668470 Marsden Fast-Start Fund EU project StratoClim Deutsche Forschungsgemeinschaft, DFG - No. PA 1714/6-1 istex:4ABABD0F1706B3709477E759433DFFE088D5712D ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 scopus-id:2-s2.0-84954558994 |
ISSN: | 0094-8276 1944-8007 1944-8007 |
DOI: | 10.1002/2015GL065879 |