the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Carbonyl sulfide (OCS) exchange between soils and the atmosphere affected by soil moisture and compensation points
Abstract. Carbonyl sulfide (OCS) is a chemically quite stable gas in the troposphere (lifetime ~ 2–6 years) and consequently some of it is transported up to the stratosphere where it contributes to the stratospheric sulfate layer. Due to the similarities in uptake mechanism between OCS and CO2, the use of OCS as a proxy for CO2 in ecosystem gross primary production (GPP) has been proposed. For this application a good understanding of uptake (UOCS) and production (POCS) processes of OCS in an ecosystem is required. A new OCS quantum cascade laser coupled with an automated soil chamber system enabled us to measure the soil-atmosphere OCS exchange of four different soil samples with high precision. The adjustment of the chamber air to different OCS mixing ratios (50, 500, and 1000 ppt) allowed us to separate production and consumption processes and to estimate compensation points (CPs) for the OCS exchange. At an atmospheric mixing ratio of 1000 ppt, the maximum UOCS was of the order of 22 to 110 pmol g−1 h−1 for needle forest soil samples and of the order of 3 to 5 pmol g−1 h−1 for an agricultural mineral soil, both measured at moderate soil moisture. Uptake processes (UOCS) were dominant at all soil moistures for the forest soils, while POCS exceeded UOCS at higher soil moistures for the agricultural soil, resulting in net emission. Hence, our results indicate that in (spruce) forests UOCS might be the dominant process, while in agricultural soils POCS at higher soil moisture and UOCS under moderate soil moisture seem to dominate the OCS exchange. The OCS compensation points (CPs) were highly dependent on soil water content and extended over a wide range of 130 ppt to 1600 ppt for the forest soils and 450 ppt to 5500 ppt for the agricultural soil. The strong dependency between soil water content and the compensation point value must be taken into account for all further analyses. The lowest CPs were found at about 20 % water filled pore space (WFPSlab), implying the maximum of UOCS under these soil moisture conditions and excluding OCS emission under such conditions. We discuss our results in view of other studies about compensation points and the potential contribution of microbial groups.
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RC1: 'Comments on Bunk et al.', Anonymous Referee #1, 15 May 2018
- AC1: 'AC: reply to R1', Rüdiger Bunk, 28 Jun 2018
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RC2: 'Comments on Bunk and Yi et al', Anonymous Referee #2, 16 May 2018
- AC2: 'AC: reply to R2', Rüdiger Bunk, 28 Jun 2018
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RC3: 'Carbonyl sulfide (OCS) exchange between soils and the atmosphere affected by soil moisture and compensation points', Anonymous Referee #3, 16 May 2018
- AC3: 'AC: reply to R3', Rüdiger Bunk, 28 Jun 2018
-
RC1: 'Comments on Bunk et al.', Anonymous Referee #1, 15 May 2018
- AC1: 'AC: reply to R1', Rüdiger Bunk, 28 Jun 2018
-
RC2: 'Comments on Bunk and Yi et al', Anonymous Referee #2, 16 May 2018
- AC2: 'AC: reply to R2', Rüdiger Bunk, 28 Jun 2018
-
RC3: 'Carbonyl sulfide (OCS) exchange between soils and the atmosphere affected by soil moisture and compensation points', Anonymous Referee #3, 16 May 2018
- AC3: 'AC: reply to R3', Rüdiger Bunk, 28 Jun 2018
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Cited
4 citations as recorded by crossref.
- Carbonyl sulfide (COS) and carbon disulfide (CS2) exchange fluxes between cotton fields and the atmosphere in the arid area in Xinjiang, China W. Jing et al. 10.1007/s10653-019-00268-9
- Charge-Shifted Weak Noncovalent Interactions in the Atmospherically Important OCS Microhydrates S. Mondal 10.1021/acs.jpca.2c07670
- Microbial community responses determine how soil–atmosphere exchange of carbonyl sulfide, carbon monoxide, and nitric oxide responds to soil moisture T. Behrendt et al. 10.5194/soil-5-121-2019
- Enumeration of Chemoorganotrophic Carbonyl Sulfide (COS)-degrading Microorganisms by the Most Probable Number Method H. Kato et al. 10.1264/jsme2.ME19139