The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS2) in the Peruvian upwelling

Sinikka T. Lennartz; Marc Von Hobe; Dennis Booge; Henry C. Bittig; Tim Fischer; Rafael Gonçalves-Araujo; Kerstin B. Ksionzek; Boris P. Koch; Astrid Bracher; Rüdiger Röttgers; Birgit Quack; Christa A. Marandino

doi:10.5194/os-15-1071-2019

The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS₂) in the Peruvian upwelling

Sinikka T. Lennartz^*, Marc Von Hobe, Dennis Booge, Henry C. Bittig, Tim Fischer, Rafael Gonçalves-Araujo, Kerstin B. Ksionzek, Boris P. Koch, Astrid Bracher, Rüdiger Röttgers, Birgit Quack, Christa A. Marandino

^*Corresponding author af dette arbejde

Institut for Ecoscience - Marin biodiversitet og eksperimentel økologi

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

23 Citationer (Scopus)

Abstract

Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current and future emission estimates are still uncertain due to incomplete process understanding and therefore inexact quantification across different biogeochemical regimes. Here we present the first concurrent measurements of both gases together with related fractions of the dissolved organic matter (DOM) pool, i.e., solid-phase extractable dissolved organic sulfur (DOSSPE, ine24, 0.16±0.04 μ L-1), chromophoric (CDOM, 76, 0.152±0.03), and fluorescent dissolved organic matter (FDOM, 35), from the Peruvian upwelling region (Guayaquil, Ecuador to Antofagasta, Chile, October 2015). OCS was measured continuously with an equilibrator connected to an off-axis integrated cavity output spectrometer at the surface (29.8±19.8 pmol L-1) and at four profiles ranging down to 136 m. CS2 was measured at the surface (143, 17.8±9.0 pmol L-1) and below, ranging down to 1000 m (24 profiles). These observations were used to estimate in situ production rates and identify their drivers. We find different limiting factors of marine photoproduction: while OCS production is limited by the humic-like DOM fraction that can act as a photosensitizer, high CS2 production coincides with high DOSSPE concentration. Quantifying OCS photoproduction using a specific humic-like FDOM component as proxy, together with an updated parameterization for dark production, improves agreement with observations in a 1-D biogeochemical model. Ourpage1072 results will help to better predict oceanic concentrations and emissions of both gases on regional and, potentially, global scales.

Originalsprog	Engelsk
Tidsskrift	Ocean Science
Vol/bind	15
Nummer	4
Sider (fra-til)	1071-1090
Antal sider	20
ISSN	1812-0784
DOI	https://doi.org/10.5194/os-15-1071-2019
Status	Udgivet - 2019

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10.5194/os-15-1071-2019Licens: CC BY

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http://www.scopus.com/inward/record.url?scp=85070876758&partnerID=8YFLogxK

Citationsformater

Lennartz, S. T., Von Hobe, M., Booge, D., Bittig, H. C., Fischer, T., Gonçalves-Araujo, R., Ksionzek, K. B., Koch, B. P., Bracher, A., Röttgers, R., Quack, B., & Marandino, C. A. (2019). The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS₂) in the Peruvian upwelling. Ocean Science, 15(4), 1071-1090. https://doi.org/10.5194/os-15-1071-2019

@article{f1120b3e3b7c40119cd11776a3d07c06,

title = "The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS2) in the Peruvian upwelling",

abstract = "Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current and future emission estimates are still uncertain due to incomplete process understanding and therefore inexact quantification across different biogeochemical regimes. Here we present the first concurrent measurements of both gases together with related fractions of the dissolved organic matter (DOM) pool, i.e., solid-phase extractable dissolved organic sulfur (DOSSPE, ine24, 0.16±0.04 μ L-1), chromophoric (CDOM, 76, 0.152±0.03), and fluorescent dissolved organic matter (FDOM, 35), from the Peruvian upwelling region (Guayaquil, Ecuador to Antofagasta, Chile, October 2015). OCS was measured continuously with an equilibrator connected to an off-axis integrated cavity output spectrometer at the surface (29.8±19.8 pmol L-1) and at four profiles ranging down to 136 m. CS2 was measured at the surface (143, 17.8±9.0 pmol L-1) and below, ranging down to 1000 m (24 profiles). These observations were used to estimate in situ production rates and identify their drivers. We find different limiting factors of marine photoproduction: while OCS production is limited by the humic-like DOM fraction that can act as a photosensitizer, high CS2 production coincides with high DOSSPE concentration. Quantifying OCS photoproduction using a specific humic-like FDOM component as proxy, together with an updated parameterization for dark production, improves agreement with observations in a 1-D biogeochemical model. Ourpage1072 results will help to better predict oceanic concentrations and emissions of both gases on regional and, potentially, global scales.",

author = "Lennartz, {Sinikka T.} and {Von Hobe}, Marc and Dennis Booge and Bittig, {Henry C.} and Tim Fischer and Rafael Gon{\c c}alves-Araujo and Ksionzek, {Kerstin B.} and Koch, {Boris P.} and Astrid Bracher and R{\"u}diger R{\"o}ttgers and Birgit Quack and Marandino, {Christa A.}",

year = "2019",

doi = "10.5194/os-15-1071-2019",

language = "English",

volume = "15",

pages = "1071--1090",

journal = "Ocean Science",

issn = "1812-0784",

publisher = "Copernicus GmbH",

number = "4",

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Lennartz, ST, Von Hobe, M, Booge, D, Bittig, HC, Fischer, T, Gonçalves-Araujo, R, Ksionzek, KB, Koch, BP, Bracher, A, Röttgers, R, Quack, B & Marandino, CA 2019, 'The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS₂) in the Peruvian upwelling', Ocean Science, bind 15, nr. 4, s. 1071-1090. https://doi.org/10.5194/os-15-1071-2019

The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS₂) in the Peruvian upwelling. / Lennartz, Sinikka T.; Von Hobe, Marc; Booge, Dennis et al.
I: Ocean Science, Bind 15, Nr. 4, 2019, s. 1071-1090.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

TY - JOUR

T1 - The influence of dissolved organic matter on the marine production of carbonyl sulfide (OCS) and carbon disulfide (CS2) in the Peruvian upwelling

AU - Lennartz, Sinikka T.

AU - Von Hobe, Marc

AU - Booge, Dennis

AU - Bittig, Henry C.

AU - Fischer, Tim

AU - Gonçalves-Araujo, Rafael

AU - Ksionzek, Kerstin B.

AU - Koch, Boris P.

AU - Bracher, Astrid

AU - Röttgers, Rüdiger

AU - Quack, Birgit

AU - Marandino, Christa A.

PY - 2019

Y1 - 2019

N2 - Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current and future emission estimates are still uncertain due to incomplete process understanding and therefore inexact quantification across different biogeochemical regimes. Here we present the first concurrent measurements of both gases together with related fractions of the dissolved organic matter (DOM) pool, i.e., solid-phase extractable dissolved organic sulfur (DOSSPE, ine24, 0.16±0.04 μ L-1), chromophoric (CDOM, 76, 0.152±0.03), and fluorescent dissolved organic matter (FDOM, 35), from the Peruvian upwelling region (Guayaquil, Ecuador to Antofagasta, Chile, October 2015). OCS was measured continuously with an equilibrator connected to an off-axis integrated cavity output spectrometer at the surface (29.8±19.8 pmol L-1) and at four profiles ranging down to 136 m. CS2 was measured at the surface (143, 17.8±9.0 pmol L-1) and below, ranging down to 1000 m (24 profiles). These observations were used to estimate in situ production rates and identify their drivers. We find different limiting factors of marine photoproduction: while OCS production is limited by the humic-like DOM fraction that can act as a photosensitizer, high CS2 production coincides with high DOSSPE concentration. Quantifying OCS photoproduction using a specific humic-like FDOM component as proxy, together with an updated parameterization for dark production, improves agreement with observations in a 1-D biogeochemical model. Ourpage1072 results will help to better predict oceanic concentrations and emissions of both gases on regional and, potentially, global scales.

AB - Oceanic emissions of the climate-relevant trace gases carbonyl sulfide (OCS) and carbon disulfide (CS2) are a major source to their atmospheric budget. Their current and future emission estimates are still uncertain due to incomplete process understanding and therefore inexact quantification across different biogeochemical regimes. Here we present the first concurrent measurements of both gases together with related fractions of the dissolved organic matter (DOM) pool, i.e., solid-phase extractable dissolved organic sulfur (DOSSPE, ine24, 0.16±0.04 μ L-1), chromophoric (CDOM, 76, 0.152±0.03), and fluorescent dissolved organic matter (FDOM, 35), from the Peruvian upwelling region (Guayaquil, Ecuador to Antofagasta, Chile, October 2015). OCS was measured continuously with an equilibrator connected to an off-axis integrated cavity output spectrometer at the surface (29.8±19.8 pmol L-1) and at four profiles ranging down to 136 m. CS2 was measured at the surface (143, 17.8±9.0 pmol L-1) and below, ranging down to 1000 m (24 profiles). These observations were used to estimate in situ production rates and identify their drivers. We find different limiting factors of marine photoproduction: while OCS production is limited by the humic-like DOM fraction that can act as a photosensitizer, high CS2 production coincides with high DOSSPE concentration. Quantifying OCS photoproduction using a specific humic-like FDOM component as proxy, together with an updated parameterization for dark production, improves agreement with observations in a 1-D biogeochemical model. Ourpage1072 results will help to better predict oceanic concentrations and emissions of both gases on regional and, potentially, global scales.

UR - http://www.scopus.com/inward/record.url?scp=85070876758&partnerID=8YFLogxK

U2 - 10.5194/os-15-1071-2019

DO - 10.5194/os-15-1071-2019

M3 - Journal article

AN - SCOPUS:85070876758

SN - 1812-0784

VL - 15

SP - 1071

EP - 1090

JO - Ocean Science

JF - Ocean Science

IS - 4

ER -