Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation
Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting c...
Published in: | Frontiers in Marine Science |
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Online Access: | https://oceanrep.geomar.de/id/eprint/39273/ https://oceanrep.geomar.de/id/eprint/39273/1/fmars-04-00271.pdf https://oceanrep.geomar.de/id/eprint/39273/2/image%201.pdf https://doi.org/10.3389/fmars.2017.00271 |
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ftoceanrep:oai:oceanrep.geomar.de:39273 2023-05-15T17:36:08+02:00 Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation Zark, Maren Broda, Nadine K. Hornick, Thomas Grossart, Hans-Peter Riebesell, Ulf Dittmar, Thorsten 2017-09-05 text https://oceanrep.geomar.de/id/eprint/39273/ https://oceanrep.geomar.de/id/eprint/39273/1/fmars-04-00271.pdf https://oceanrep.geomar.de/id/eprint/39273/2/image%201.pdf https://doi.org/10.3389/fmars.2017.00271 en eng Frontiers https://oceanrep.geomar.de/id/eprint/39273/1/fmars-04-00271.pdf https://oceanrep.geomar.de/id/eprint/39273/2/image%201.pdf Zark, M., Broda, N. K., Hornick, T., Grossart, H. P., Riebesell, U. and Dittmar, T. (2017) Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation. Open Access Frontiers in Marine Science, 4 . Art.Nr. 271. DOI 10.3389/fmars.2017.00271 <https://doi.org/10.3389/fmars.2017.00271>. doi:10.3389/fmars.2017.00271 cc_by_4.0 info:eu-repo/semantics/openAccess Article PeerReviewed 2017 ftoceanrep https://doi.org/10.3389/fmars.2017.00271 2023-04-07T15:35:04Z Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from ~350 up to ~1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, ~50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a ... Article in Journal/Newspaper North Atlantic Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Frontiers in Marine Science 4 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Dissolved organic matter (DOM) represents a major reservoir of carbon in the oceans. Environmental stressors such as ocean acidification (OA) potentially affect DOM production and degradation processes, e.g., phytoplankton exudation or microbial uptake and biotransformation of molecules. Resulting changes in carbon storage capacity of the ocean, thus, may cause feedbacks on the global carbon cycle. Previous experiments studying OA effects on the DOM pool under natural conditions, however, were mostly conducted in temperate and coastal eutrophic areas. Here, we report on OA effects on the existing and newly produced DOM pool during an experiment in the subtropical North Atlantic Ocean at the Canary Islands during an (1) oligotrophic phase and (2) after simulated deep water upwelling. The last is a frequently occurring event in this region controlling nutrient and phytoplankton dynamics. We manipulated nine large-scale mesocosms with a gradient of pCO2 ranging from ~350 up to ~1,030 μatm and monitored the DOM molecular composition using ultrahigh-resolution mass spectrometry via Fourier-transform ion cyclotron resonance mass spectrometry (FT-ICR-MS). An increase of 37 μmol L−1 DOC was observed in all mesocosms during a phytoplankton bloom induced by simulated upwelling. Indications for enhanced DOC accumulation under elevated CO2 became apparent during a phase of nutrient recycling toward the end of the experiment. The production of DOM was reflected in changes of the molecular DOM composition. Out of the 7,212 molecular formulae, which were detected throughout the experiment, ~50% correlated significantly in mass spectrometric signal intensity with cumulative bacterial protein production (BPP) and are likely a product of microbial transformation. However, no differences in the produced compounds were found with respect to CO2 levels. Comparing the results of this experiment with a comparable OA experiment in the Swedish Gullmar Fjord, reveals similar succession patterns for individual compound pools during a ... |
format |
Article in Journal/Newspaper |
author |
Zark, Maren Broda, Nadine K. Hornick, Thomas Grossart, Hans-Peter Riebesell, Ulf Dittmar, Thorsten |
spellingShingle |
Zark, Maren Broda, Nadine K. Hornick, Thomas Grossart, Hans-Peter Riebesell, Ulf Dittmar, Thorsten Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
author_facet |
Zark, Maren Broda, Nadine K. Hornick, Thomas Grossart, Hans-Peter Riebesell, Ulf Dittmar, Thorsten |
author_sort |
Zark, Maren |
title |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_short |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_full |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_fullStr |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_full_unstemmed |
Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation |
title_sort |
ocean acidification experiments in large-scale mesocosms reveal similar dynamics of dissolved organic matter production and biotransformation |
publisher |
Frontiers |
publishDate |
2017 |
url |
https://oceanrep.geomar.de/id/eprint/39273/ https://oceanrep.geomar.de/id/eprint/39273/1/fmars-04-00271.pdf https://oceanrep.geomar.de/id/eprint/39273/2/image%201.pdf https://doi.org/10.3389/fmars.2017.00271 |
genre |
North Atlantic Ocean acidification |
genre_facet |
North Atlantic Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/39273/1/fmars-04-00271.pdf https://oceanrep.geomar.de/id/eprint/39273/2/image%201.pdf Zark, M., Broda, N. K., Hornick, T., Grossart, H. P., Riebesell, U. and Dittmar, T. (2017) Ocean Acidification Experiments in Large-Scale Mesocosms Reveal Similar Dynamics of Dissolved Organic Matter Production and Biotransformation. Open Access Frontiers in Marine Science, 4 . Art.Nr. 271. DOI 10.3389/fmars.2017.00271 <https://doi.org/10.3389/fmars.2017.00271>. doi:10.3389/fmars.2017.00271 |
op_rights |
cc_by_4.0 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/fmars.2017.00271 |
container_title |
Frontiers in Marine Science |
container_volume |
4 |
_version_ |
1766135536070688768 |