Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions

Memoria de tesis doctoral presentada por Patricia de la Fuiente Gamero para obtener el título de Doctora en Ciencias del Mar por la Universitat Politècnica de Catalunya (UPC), realizada bajo la dirección del Dr. Josep Lluís Pelegrí y de la Dra. Celia Marrasé del Institut de Ciències del Mar (ICM-CSI...

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Detalhes bibliográficos
Autor: Fuente Gamero, Patricia de la
Formato: tesis doctoral
Fecha de publicación:2019
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/188312
Acesso em linha:http://hdl.handle.net/10261/188312
Access Level:acceso abierto
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network_acronym_str ES
network_name_str España
repository_id_str
dc.title.none.fl_str_mv Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
title Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
spellingShingle Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
Fuente Gamero, Patricia de la
title_short Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
title_full Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
title_fullStr Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
title_full_unstemmed Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
title_sort Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate Transitions
dc.creator.none.fl_str_mv Fuente Gamero, Patricia de la
author Fuente Gamero, Patricia de la
author_facet Fuente Gamero, Patricia de la
author_role author
dc.contributor.none.fl_str_mv Pelegrí, Josep Lluís
Marrasé, Cèlia
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
description Memoria de tesis doctoral presentada por Patricia de la Fuiente Gamero para obtener el título de Doctora en Ciencias del Mar por la Universitat Politècnica de Catalunya (UPC), realizada bajo la dirección del Dr. Josep Lluís Pelegrí y de la Dra. Celia Marrasé del Institut de Ciències del Mar (ICM-CSIC).-- 120 pages
publishDate 2019
dc.date.none.fl_str_mv 2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/doctoralThesis
http://purl.org/coar/resource_type/c_db06
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/188312
url http://hdl.handle.net/10261/188312
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Universidad Politécnica de Cataluña
CSIC - Instituto de Ciencias del Mar (ICM)
publisher.none.fl_str_mv Universidad Politécnica de Cataluña
CSIC - Instituto de Ciencias del Mar (ICM)
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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spelling Dynamics of Marine Dissolved Organic Matter: Ocean Metabolism and Climate TransitionsFuente Gamero, Patricia de laMemoria de tesis doctoral presentada por Patricia de la Fuiente Gamero para obtener el título de Doctora en Ciencias del Mar por la Universitat Politècnica de Catalunya (UPC), realizada bajo la dirección del Dr. Josep Lluís Pelegrí y de la Dra. Celia Marrasé del Institut de Ciències del Mar (ICM-CSIC).-- 120 pagesThe Global Ocean is the largest Earth compartment holding carbon and nutrients that reaches the upper-ocean at temporal scales ranging from months to 10 kyr. The availability of these nutrients is fundamental to sustain primary production and the concentration of dissolved inorganic carbon (DIC) in surface waters controls the glacial-interglacial changes in atmospheric. One process that influences both nutrients and carbon availability is the Microbial Carbon Pump (MCP), which refers to the production of refractory dissolved organic carbon (RDOC) compounds via heterotrophic microbial activity. Variations in the RDOC pool affect long-term carbon storage in the ocean, hence influencing the carbon cycle and climate. The general objective of this thesis is to expand our understanding of the connections between RDOC production by MCP and the ocean metabolism (understood as the upper-ocean net autotrophic community production), paying special attention to the role of the marine microbial processes in the glacial-interglacial transitions of the Earth system. The RDOC production by MCP is inferred through the lineal dependence of fluorescent dissolved organic matter (FDOM) with apparent oxygen utilization (AOU) and nutrients. This relationship, however, depends on the preformed content in the water masses. In this thesis, a valuable dataset, obtained from a high-resolution spatial sampling along 7.5ºN in the equatorial Atlantic Ocean, is used to distinguish the variability of FDOM distribution associated with in situ production from that related to the water properties at origin. A simple objective nonlinear-global methodology for resolving the non-conservative fraction of biogeochemical variables distribution is presented. The approach focuses on fitting high-order polynomial models over the entire temperature-salinity space. The differences between the modelled values and the observations are identified as biogeochemical anomalies. The goodness of the method is compared, for each water stratum, with the traditional approach, which is based on the local linear mixing of a maximum of three source water masses. The new methodology has good skill at distinguishing between the conservative and non-conservative contributions to biogeochemical variables, lending information about biogeochemical processes, stoichiometric ratios and patterns of connectivity within a certain region. For the first time, a general relationship between humic-like FDOM and AOU in the dark equatorial Atlantic Ocean is formulated, irrespective of the water masses. The results endorse the idea that FDOM is mostly produced in situ in the dark ocean. In the second part of the thesis, the role of RDOC pool in quaternary climate transitions is explored. The glacial-interglacial transitions are considered as functional states of the complex Earth system, with different energetic conditions in terms of solar energy conversion through marine photosynthesis. However, the oceanic system capacity to capture and transform the incident solar radiation depends on the availability of DIC and nutrients to the productive upper ocean. The supply of DIC and nutrients by the Meridional Overturning Circulation (MOC) and the DOM pool are evaluated through a simple two-box and two-state relaxation-type model for the DIC and nutrients in the upper ocean. The model, inspired on physiological concepts, considers the upper ocean to switch between basal (glacial) and enhanced (interglacial) metabolic states. The model reproduces well the atmospheric time series for the last 420 kyr, providing a solution for the size and temporal dependence of the MOC and setting global constraints on primary production and remineralization in the upper ocean. The RDOC accumulates during the glacial period and its availability at the end of this cycle sets the metabolic intensity of the subsequent interglacial, in what constitutes a central component of the Earth’s pulsating homeostatic organizationThe research was funded by the Secretary of Universities and Research of the Ministry of Business and Knowledge of the Generalitat of Catalonia, with the support of the European Social Fund through a FI-AGAUR fellowship. And it was carried out in the frame of the following projects: MOC2 (CTM2008-06438-C02), TIC-MOC (CTM2011-28867) and DOREMI (CTM2012-34294) funded by the R+D Spanish research program, FISIOCEAN (PIF08-006-1) funded by CSIC’s frontier program and ECLIPSE project financed by Total FoundationPeer reviewedUniversidad Politécnica de CataluñaCSIC - Instituto de Ciencias del Mar (ICM)Pelegrí, Josep LluísMarrasé, CèliaConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201920192019info:eu-repo/semantics/doctoralThesishttp://purl.org/coar/resource_type/c_db06http://hdl.handle.net/10261/188312reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésSíinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1883122026-05-22T06:33:51Z
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