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Published October 27, 2015 | Published
Journal Article Open

Estimate of carbonyl sulfide tropical oceanic surface fluxes using Aura Tropospheric Emission Spectrometer observations


Quantifying the carbonyl sulfide (OCS) land/ocean fluxes contributes to the understanding of both the sulfur and carbon cycles. The primary sources and sinks of OCS are very likely in a steady state because there is no significant observed trend or interannual variability in atmospheric OCS measurements. However, the magnitude and spatial distribution of the dominant ocean source are highly uncertain due to the lack of observations. In particular, estimates of the oceanic fluxes range from approximately 280 Gg S yr^(−1) to greater than 800 Gg S yr^(−1), with the larger flux needed to balance a similarly sized terrestrial sink that is inferred from NOAA continental sites. Here we estimate summer tropical oceanic fluxes of OCS in 2006 using a linear flux inversion algorithm and new OCS data acquired by the Aura Tropospheric Emissions Spectrometer (TES). Modeled OCS concentrations based on these updated fluxes are consistent with HIAPER Pole‐to‐Pole Observations during 4th airborne campaign and improve significantly over the a priori model concentrations. The TES tropical ocean estimate of 70 ± 16 Gg S in June, when extrapolated over the whole year (about 840 ± 192 Gg S yr^(−1), supports the hypothesis proposed by Berry et al. (2013) that the ocean flux is in the higher range of approximately 800 Gg S yr^(−1).

Additional Information

© 2015. American Geophysical Union. Received 8 APR 2015. Accepted 28 AUG 2015. Accepted article online 4 SEP 2015. Published online 23 OCT 2015. This work was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration. King‐Fai Li was supported in part by the UCAR Jack Eddy Fellowship and by the NASA grant (NNX14AR40G) to the University of Washington. Yuk L. Yung acknowledged support by NASA grant (NNX13AK34G) to Caltech. The authors would like to acknowledge Randy Kawa for the help with the OH flux data and also thank Steve Wofsy, Elliot Atlas, Benjamin R. Miller, Fred Moore, James Elkins, and all other HIPPO, NOAA team members (the pilots, mechanics, technicians, and scientific crew) for making the HIPPO and NOAA data available. HIPPO was supported by NSF grants ATM‐0628575, ATM‐0628519, and ATM‐0628388 and by the National Center for Atmospheric Research (NCAR). NCAR is supported by the NSF. The data used in this paper are archived at Jet Propulsion Laboratory and are available from the authors upon request (kl@gps.caltech.edu).

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Published - Kuai_et_al-2015-Journal_of_Geophysical_Research_3A_Atmospheres.pdf


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August 22, 2023
August 22, 2023