Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling
The ongoing increase in atmospheric carbon dioxide (CO2) leads to a global increase in temperatures and its subsequent uptake by the ocean considerably alters the carbonate chemistry of seawater, a phenomenon generally referred to as “ocean acidification”. Both ocean warming and acidification occur...
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ftoceanrep:oai:oceanrep.geomar.de:22983 2023-05-15T17:51:48+02:00 Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling Taucher, Jan 2013 text https://oceanrep.geomar.de/id/eprint/22983/ https://oceanrep.geomar.de/id/eprint/22983/1/Dissertation_Jan_Taucher.pdf en eng https://oceanrep.geomar.de/id/eprint/22983/1/Dissertation_Jan_Taucher.pdf Taucher, J. (2013) Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling. (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 193 pp. cc_by Thesis NonPeerReviewed 2013 ftoceanrep 2023-04-07T15:11:38Z The ongoing increase in atmospheric carbon dioxide (CO2) leads to a global increase in temperatures and its subsequent uptake by the ocean considerably alters the carbonate chemistry of seawater, a phenomenon generally referred to as “ocean acidification”. Both ocean warming and acidification occur at a pace unprecedented in recent geological history and are expected to significantly affect marine biota. In the present thesis, the sensitivity of marine ecosystems and biogeochemical cycling to increasing temperatures and CO2 was investigated in a combined approach of numerical modeling and experimental work. In a first step, the role of direct temperature effects in the response of marine ecosystems to ocean warming was investigated by simulating climate change in a global earth system model, based on emission scenarios for the 21st century. The study revealed fundamental uncertainties in our knowledge about temperature sensitivities of marine ecosystems and biogeochemical cycling. Depending on whether biological processes were assumed temperature sensitive or not, simulated marine NPP increased or decreased under projected climate change. Motivated by the outcome of this modeling study, a mesocosm experiment was carried out to specifically investigate the temperature sensitivity of biogeochemically important processes in diatom-dominated plankton communities.The results from this mesocosm study suggested a pronounced increase in carbon uptake and production of organic matter in response to elevated temperatures, which was contrary to results from similar experiments. A major difference to previous mesocosm studies was the dominant phytoplankton species, suggesting that the physiological response of this species determined the biogeochemical response of the entire plankton community. In order to test this hypothesis, culture experiments were conducted to compare the sensitivities of two globally important diatom species (Thalassiosira weissflogii and Dactyliosolen fragilissimus)to temperature and CO2.The results ... Thesis Ocean acidification OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
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English |
description |
The ongoing increase in atmospheric carbon dioxide (CO2) leads to a global increase in temperatures and its subsequent uptake by the ocean considerably alters the carbonate chemistry of seawater, a phenomenon generally referred to as “ocean acidification”. Both ocean warming and acidification occur at a pace unprecedented in recent geological history and are expected to significantly affect marine biota. In the present thesis, the sensitivity of marine ecosystems and biogeochemical cycling to increasing temperatures and CO2 was investigated in a combined approach of numerical modeling and experimental work. In a first step, the role of direct temperature effects in the response of marine ecosystems to ocean warming was investigated by simulating climate change in a global earth system model, based on emission scenarios for the 21st century. The study revealed fundamental uncertainties in our knowledge about temperature sensitivities of marine ecosystems and biogeochemical cycling. Depending on whether biological processes were assumed temperature sensitive or not, simulated marine NPP increased or decreased under projected climate change. Motivated by the outcome of this modeling study, a mesocosm experiment was carried out to specifically investigate the temperature sensitivity of biogeochemically important processes in diatom-dominated plankton communities.The results from this mesocosm study suggested a pronounced increase in carbon uptake and production of organic matter in response to elevated temperatures, which was contrary to results from similar experiments. A major difference to previous mesocosm studies was the dominant phytoplankton species, suggesting that the physiological response of this species determined the biogeochemical response of the entire plankton community. In order to test this hypothesis, culture experiments were conducted to compare the sensitivities of two globally important diatom species (Thalassiosira weissflogii and Dactyliosolen fragilissimus)to temperature and CO2.The results ... |
format |
Thesis |
author |
Taucher, Jan |
spellingShingle |
Taucher, Jan Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
author_facet |
Taucher, Jan |
author_sort |
Taucher, Jan |
title |
Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
title_short |
Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
title_full |
Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
title_fullStr |
Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
title_full_unstemmed |
Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling |
title_sort |
effects of increasing temperatures and co2 on phytoplankton and marine biogeochemical cycles - combining experimental work and numerical modeling |
publishDate |
2013 |
url |
https://oceanrep.geomar.de/id/eprint/22983/ https://oceanrep.geomar.de/id/eprint/22983/1/Dissertation_Jan_Taucher.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://oceanrep.geomar.de/id/eprint/22983/1/Dissertation_Jan_Taucher.pdf Taucher, J. (2013) Effects of increasing temperatures and CO2 on phytoplankton and marine biogeochemical cycles - Combining experimental work and numerical modeling. (PhD/ Doctoral thesis), Christian-Albrechts-Universität Kiel, Kiel, Germany, 193 pp. |
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1766159057552408576 |