University of Wollongong
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Positive trends in Southern Hemisphere carbonyl sulfide

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posted on 2024-11-16, 07:10 authored by Stefanie Kremser, Nicholas JonesNicholas Jones, Mathias Palm, Bernard Lejeune, Yuting Wang, D Smale, Nicholas DeutscherNicholas Deutscher
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.

Funding

Tropospheric ozone and air quality in Australia

Australian Research Council

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High resolution Fourier transform infrared spectrometer for atmospheric remote sensing and laboratory spectroscopy

Australian Research Council

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History

Citation

Kremser, S., Jones, N. B., Palm, M., Lejeune, B., Wang, Y., Smale, D. & Deutscher, N. M. (2015). Positive trends in Southern Hemisphere carbonyl sulfide. Geophysical Research Letters, 42 (21), 9473-9480.

Journal title

Geophysical Research Letters

Volume

42

Issue

21

Pagination

9473-9480

Language

English

RIS ID

105178

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