Premium
Positive trends in Southern Hemisphere carbonyl sulfide
Author(s) -
Kremser Stefanie,
Jones Nicholas B.,
Palm Mathias,
Lejeune Bernard,
Wang Yuting,
Smale Dan,
Deutscher Nicholas M.
Publication year - 2015
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2015gl065879
Subject(s) - stratosphere , carbonyl sulfide , aerosol , atmospheric sciences , troposphere , southern hemisphere , environmental science , northern hemisphere , climatology , meteorology , sulfur , geology , chemistry , geography , organic chemistry
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.