Björn Fiedler

GEOMAR Helmholtz Centre for Ocean Research Kiel

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Arne Körtzinger

GEOMAR Helmholtz Centre for Ocean Research Kiel

Johannes Karstensen

GEOMAR Helmholtz Centre for Ocean Research Kiel

Tobias Steinhoff

GEOMAR Helmholtz Centre for Ocean Research Kiel

Florian Schütte

GEOMAR Helmholtz Centre for Ocean Research Kiel

Peer Fietzek

BMT Group (Germany)

Helena Hauss

GEOMAR Helmholtz Centre for Ocean Research Kiel

Carolin R. Löscher

University of Southern Denmark

Gerd Krahmann

GEOMAR Helmholtz Centre for Ocean Research Kiel

Damian S. Grundle

Bermuda Institute of Ocean Sciences

Henry C. Bittig

Leibniz Institute for Baltic Sea Research

Cooperative Institutions

GEOMAR Helmholtz Centre for Ocean Research Kiel

Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung

Max Planck Institute for Chemistry

Centre National de la Recherche Scientifique

National Oceanic and Atmospheric Administration

Kiel University

Max Planck Society

University of Bremen

NOAA Pacific Marine Environmental Laboratory

Sorbonne Université

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Biogeochemistry and Ecology of Oxygen Depleted Eddies in the Eastern Tropical Atlantic

Björn Fiedler Damian S. Grundle Helena Hauss Johannes Karstensen Gerd Krahmann

Biogeochemistry

Source

Cite

Citations (0)

Supplementary material to "Dead zone or oasis in the open ocean? Zooplankton distribution and migration in low-oxygen modewater eddies"

Helena Hauss S.L. Christiansen Florian Schütte Rainer Kiko M. Edvam Lima

Eddy

10.5194/bgd-12-18315-2015-supplement

Cite

Citations (0)

Low oxygen eddies: Implications for nitrous oxide production

Damian S. Grundle Mark A. Altabet Björn Fiedler Helena Hauss Johannes Karstensen

Nitrous oxide

Eddy

Source

Cite

Citations (0)

Special Event: Coastal Ecosystem Monitoring (Cabo Verde - South Africa Collaboration) (Africa)

Björn Fiedler Cordula Andrea Zenk Corrine Almeida

Cape verde

Source

Cite

Citations (0)

In Situ CO2 and O2 measurements on a profiling float at the Cape Verde Ocean Observatory | CVOO

Björn Fiedler Peer Fietzek Johannes Karstensen Natividade Vieira Henry C. Bittig

During SOPRAN I & II, field work activities focused mainly on the Eastern Tropical North Atlantic (ETNA) near the Cape Verde Ocean Observatory (CVOO). Here we report about two major achievements during SOPRAN I & II: (i) A typical ARGO float with a small-sized and novel submersible CO2 partial pressure (pCO2) sensor and an optode O2 sensor for high resolution measurements in the upper ocean was developed and field-deployed successfully. We report on the quality of the data as well as the distribution of the air-sea fluxes of the two gases. (ii) Autonomous measurements have shown extremely low O2 concentrations below the mixed layer ( 40 µmol/kg). To our knowledge no such anoxic water parcels have ever been reported before for the open North Atlantic.

Cape verde

Argo

Optode

Source

Cite

Citations (0)

Report on demo mission and dissemination pathways of obtained data based on different observational platforms

Björn Fiedler

This document describes the deployment of instrumentation in the Eastern tropical Atlantic area and shows the preliminary data acquired.

10.3289/eurosea_d7.1

Cite

Citations (0)

Opportunities for an African greenhouse gas observation system

Regional Environmental Change (2021)

Lutz Merbold Robert J. Scholes Manuel Acosta Johannes Beck Antonio Bombelli

Abstract Global population projections foresee the biggest increase to occur in Africa with most of the available uncultivated land to ensure food security remaining on the continent. Simultaneously, greenhouse gas emissions are expected to rise due to ongoing land use change, industrialisation, and transport amongst other reasons with Africa becoming a major emitter of greenhouse gases globally. However, distinct knowledge on greenhouse gas emissions sources and sinks as well as their variability remains largely unknown caused by its vast size and diversity and an according lack of observations across the continent. Thus, an environmental research infrastructure—as being setup in other regions—is more needed than ever. Here, we present the results of a design study that developed a blueprint for establishing such an environmental research infrastructure in Africa. The blueprint comprises an inventory of already existing observations, the spatial disaggregation of locations that will enable to reduce the uncertainty in climate forcing’s in Africa and globally as well as an overall estimated cost for such an endeavour of about 550 M€ over the next 30 years. We further highlight the importance of the development of an e-infrastructure, the necessity for capacity development and the inclusion of all stakeholders to ensure African ownership.

Blueprint

Industrialisation

10.1007/s10113-021-01823-w

Cite

Citations (10)

Spatio-temporal distribution and transport of particulate matter in the eastern tropical North Atlantic observed by Argo floats

Deep Sea Research Part I Oceanographic Research Papers (2015)

Thomas Ohde Björn Fiedler Arne Körtzinger

Argo

Tropical Atlantic

Sargasso sea

Atlantic hurricane

10.1016/j.dsr.2015.04.007

Cite

Citations (19)

A status assessment of selected data synthesis products for ocean biogeochemistry

Frontiers in Marine Science (2023)

Nico Lange Toste Tanhua Benjamin Pfeil Hermann W. Bange Siv K. Lauvset

Ocean data synthesis products for specific biogeochemical essential ocean variables have the potential to facilitate today’s biogeochemical ocean data usage and comply with the Findable Accessible Interoperable and Reusable (FAIR) data principles. The products constitute key outputs from the Global Ocean Observation System, laying the observational foundation for information and services regarding climate and environmental status of the ocean. Using the Framework of Ocean Observing (FOO) readiness level concept, we present an evaluation framework for biogeochemical data synthesis products, which enables a systematic assessment of each product’s maturity. A new criteria catalog provides the foundation for assigning scores to the nine FOO readiness levels. As an example, we apply the assessment to four existing biogeochemical essential ocean variables data products. In descending readiness level order these are: The Surface Ocean CO 2 Atlas (SOCAT); the Global Ocean Data Analysis Project (GLODAP); the MarinE MethanE and NiTrous Oxide (MEMENTO) data product and the Global Ocean Oxygen Database and ATlas (GO 2 DAT). Recognizing that the importance of adequate and comprehensive data from the essential ocean variables will grow, we recommend using this assessment framework to guide the biogeochemical data synthesis activities in their development. Moreover, we envision an overarching cross-platform FAIR biogeochemical data management system that sustainably supports the products individually and creates an integrated biogeochemical essential ocean variables data synthesis product; in short a system that provides truly comparable and FAIR data of the entire biogeochemical essential ocean variables spectrum.

Biogeochemical Cycle

Biogeochemistry

10.3389/fmars.2023.1078908

Cite

Citations (7)

Hidden biosphere in an oxygen-deficient Atlantic open ocean eddy: future implications of ocean deoxygenation on primary production in the eastern tropical North Atlantic

Carolin R. Löscher Martin A. Fischer Sven C. Neulinger Björn Fiedler Miriam Philippi

Abstract. The eastern tropical North Atlantic (ETNA) is characterized by a highly productive coastal upwelling system and a moderate oxygen minimum zone with lowest open ocean oxygen (O2) concentrations of around 40 μmol kg−1. Only recently, the discovery of re-occurring mesoscale eddies with sometimes close to anoxic O2 concentrations (<1 μmol kg−1) and located just below the mixed layer challenged our understanding of O2 distribution and biogeochemical processes in this area. Here, we present the first metagenomic dataset from a deoxygenated anticyclonic modewater eddy in the open waters of the ETNA. In the eddy, we observed a significantly lower bacterial diversity compared to surrounding waters, along with a significant community shift. We detected enhanced primary productivity in the surface layer of the eddy indicated by elevated chlorophyll concentrations and increased carbon uptake rates up to three times as high as in surrounding waters. Carbon uptake below the euphotic zone correlated to the presence of a specific high-light ecotype of Prochlorococcus, which is usually underrepresented in the ETNA. Our combined data indicate that high primary production in the eddy fuels export production and the presence of a specific microbial community responsible for enhanced respiration at shallow depths, below the mixed layer base. Progressively decreasing O2 concentrations in the eddy were found to promote transcription of the key gene for denitrification, nirS, in the O2-depleted core waters. This process is usually absent from the open ETNA waters. In the light of future ocean deoxygenation our results show exemplarily that even distinct events of anoxia have the potential to alter microbial community structures and with that critically impact primary productivity and biogeochemical processes of oceanic water bodies.

Prochlorococcus

Biogeochemical Cycle

Oxygen minimum zone

New production

Biogeochemistry

10.5194/bgd-12-14175-2015

Cite

Citations (3)