Markus Schartau
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View article: Meta-analytical insights into organic matter enrichment in the surface microlayer
Meta-analytical insights into organic matter enrichment in the surface microlayer Open
The surface microlayer (SML), the uppermost ~1 mm water layer at the air-water interface, plays a critical role in mediating Earth system processes, yet current knowledge of its composition and organic matter enrichment remains scattered a…
View article: Budgeting the particulate organic matter from the suspended particulate matter in shelf seas
Budgeting the particulate organic matter from the suspended particulate matter in shelf seas Open
Dissolved CO2 and buried organic matter budgets have been studied in shelf seas to identify carbon fractions that are exported to the ocean interior or preserved in the sediment. However, the fate of suspended particulate organic matter re…
View article: Simulating marine biogeochemistry and atmospheric pCO2 for the Last Glacial Maximum using an ensemble of calibrated parameter sets
Simulating marine biogeochemistry and atmospheric pCO2 for the Last Glacial Maximum using an ensemble of calibrated parameter sets Open
During the Last Glacial Maximum (LGM), atmospheric pCO2 was approximately 90 ppm lower than in the pre-industrial era. Several hypotheses have been proposed to explain this decrease, including changes in nutrient supply, increased iron inp…
View article: Prospects and Challenges of Investigating Ocean-Based Negative Emission Technologies: Insights from the OceanNETs Project
Prospects and Challenges of Investigating Ocean-Based Negative Emission Technologies: Insights from the OceanNETs Project Open
This OceanNETs synthesis report offers a condensed synopsis of major outcomes and key conclusions obtained from the different work packages of the project. It is designed to inform and engage scientists across a wide range of disciplines, …
View article: A Lagrangian Model‐Based Analysis of Protist Plankton Variability and Its Impact on Organic Matter Dynamics Along Transit Pathways Through the Fram Strait
A Lagrangian Model‐Based Analysis of Protist Plankton Variability and Its Impact on Organic Matter Dynamics Along Transit Pathways Through the Fram Strait Open
The Arctic Ocean is characterized by substantial seasonal and inter‐annual variability, of which the sources and impacts are not yet fully understood. Here, we analyze how much of the variability found in in situ observations of biogeochem…
View article: Transformation of dissolved organic matter and its diverse effect on higher trophic level
Transformation of dissolved organic matter and its diverse effect on higher trophic level Open
No abstracts are to be cited without prior reference to the author.A considerable amount of primary production by marine phytoplankton is released to seawater as dissolved organic matter (DOM) via exudation and leakage processes. The labil…
View article: A diffusion-based kernel density estimator (diffKDE, version 1) with optimal bandwidth approximation for the analysis of data in geoscience and ecological research
A diffusion-based kernel density estimator (diffKDE, version 1) with optimal bandwidth approximation for the analysis of data in geoscience and ecological research Open
Probability density functions (PDFs) provide information about the probability of a random variable taking on a specific value. In geoscience, data distributions are often expressed by a parametric estimation of their PDF, such as, for exa…
View article: Effects of phytoplankton physiology on global ocean biogeochemistry and climate
Effects of phytoplankton physiology on global ocean biogeochemistry and climate Open
The similarity of the average ratios of nitrogen (N) and phosphorus (P) in marine dissolved inorganic and particulate organic matter, dN:P and pN:P, respectively, indicates tight links between those pools in the world ocean. Here, we analy…
View article: Comment on gmd-2023-17
Comment on gmd-2023-17 Open
Abstract. Probability density functions (PDFs) comprise basic information about the variability of observed or simulated variables within a system of interest. In geoscience data distributions are often expressed by a parametric estimation…
View article: Exploring the role of different data types and timescales in the quality of marine biogeochemical model calibration
Exploring the role of different data types and timescales in the quality of marine biogeochemical model calibration Open
Global biogeochemical ocean models help to investigate the present and potential future state of the ocean, its productivity and cascading effects on higher trophic levels such as fish. They are often subjectively tuned against data sets o…
View article: Phytoplankton physiology controls global ocean biogeochemistry (and climate)
Phytoplankton physiology controls global ocean biogeochemistry (and climate) Open
The similarity of the average nitrogen-to-phosphorus ratios (N:P) in marine dissolved-inorganic and particulate-organic matter indicates tight links between those pools in the World Ocean. Here we analyse the sensitivity of …
View article: Comment on Kriest et al.,
Comment on Kriest et al., Open
Abstract. Global biogeochemical ocean models help to investigate the present and potential future state of the ocean biogeochemistry, its productivity and cascading effects on higher trophic levels such as fish. They are often subjectively…
View article: A diffusion-based kernel density estimator (diffKDE, version 1) with optimal bandwidth approximation for the analysis of data in geoscience and ecological research
A diffusion-based kernel density estimator (diffKDE, version 1) with optimal bandwidth approximation for the analysis of data in geoscience and ecological research Open
Probability density functions (PDFs) comprise basic information about the variability of observed or simulated variables within a system of interest. In geoscience data distributions are often expressed by a parametric estimation of their …
View article: Exploring the role of different data types and timescales for the quality of marine biogeochemical model calibration
Exploring the role of different data types and timescales for the quality of marine biogeochemical model calibration Open
Global biogeochemical ocean models help to investigate the present and potential future state of the ocean biogeochemistry, its productivity and cascading effects on higher trophic levels such as fish. They are often subjectively tuned aga…
View article: Top-down controls on the ecological niche of marine N2 fixers
Top-down controls on the ecological niche of marine N2 fixers Open
<p>The factors that control the distribution of marine diazotrophs and their ability to fix N&#8322; are not fully elucidated. We discuss insights that can be gained from the emerging picture of a wide geographical distribution o…
View article: Food web structure and intraguild predation affect ecosystem functioning in an established plankton model
Food web structure and intraguild predation affect ecosystem functioning in an established plankton model Open
Understanding how marine microbial food webs and their ecosystem functions are changing is crucial for projections of the future ocean. Often, simplified food web models are employed and their solutions are only evaluated against available…
View article: Organic Matter Composition of Biomineral Flocs and Its Influence on Suspended Particulate Matter Dynamics Along a Nearshore to Offshore Transect
Organic Matter Composition of Biomineral Flocs and Its Influence on Suspended Particulate Matter Dynamics Along a Nearshore to Offshore Transect Open
The seasonal variation in concentration of transparent exopolymer particles (TEPs), particulate organic carbon (POC) and particulate organic nitrogen (PON) were investigated together with floc size and the concentration of suspended partic…
View article: Perspectives on Marine Data Science as a Blueprint for Emerging Data Science Disciplines
Perspectives on Marine Data Science as a Blueprint for Emerging Data Science Disciplines Open
Earth System Sciences have been generating increasingly larger amounts of heterogeneous data in recent years. We identify the need to combine Earth System Sciences with Data Sciences, and give our perspective on how this could be accomplis…
View article: Description of a global marine particulate organic carbon-13 isotope data set
Description of a global marine particulate organic carbon-13 isotope data set Open
Marine particulate organic carbon stable isotope ratios (δ13CPOC) provide insights into understanding carbon cycling through the atmosphere, ocean and biosphere. They have for example been used to trace the input of anthropogenic carbon in…
View article: Can Top-Down Controls Expand the Ecological Niche of Marine N2 Fixers?
Can Top-Down Controls Expand the Ecological Niche of Marine N2 Fixers? Open
The ability of marine diazotrophs to fix dinitrogen gas (N 2 ) is one of the most influential yet enigmatic processes in the ocean. With their activity diazotrophs support biological production by fixing about 100–200 Tg N/year and turning…
View article: Comment on essd-2021-159
Comment on essd-2021-159 Open
Abstract. Marine particulate organic carbon stable isotope ratios (δ13CPOC) provide insights into understanding carbon cycling through the atmosphere, ocean and biosphere. They have for example been used to trace the input of anthropogeni…
View article: Description of a global marine particulate organic carbon-13 isotope data set
Description of a global marine particulate organic carbon-13 isotope data set Open
Marine particulate organic carbon-13 stable isotope ratios (δ13CPOC) provide insights in understanding carbon cycling through the atmosphere, ocean, and biosphere. They have been used to trace the input of anthropogenic carbon in the marin…
View article: Organic Matter Composition of Biomineral Flocs and its Influence on Suspended Particulate Matter Dynamics along a Nearshore to Offshore Transect
Organic Matter Composition of Biomineral Flocs and its Influence on Suspended Particulate Matter Dynamics along a Nearshore to Offshore Transect Open
Earth and Space Science Open Archive This work has been accepted for publication in Journal of Geophysical Research - Biogeosciences. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be pr…
View article: Spatio-Temporal Variations in Community Size Structure of Arctic Protist Plankton in the Fram Strait
Spatio-Temporal Variations in Community Size Structure of Arctic Protist Plankton in the Fram Strait Open
The Arctic Ocean is subject to severe environmental changes, including the massive decline in sea ice due to continuous warming in many regions. Along with these changes, the Arctic Ocean's ecosystem is affected on various scales. The pela…
View article: Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 2: Sensitivity analysis and model calibration
Optimality-based non-Redfield plankton–ecosystem model (OPEM v1.1) in UVic-ESCM 2.9 – Part 2: Sensitivity analysis and model calibration Open
We analyse 400 perturbed-parameter simulations for two configurations of an optimality-based plankton–ecosystem model (OPEM), implemented in the University of Victoria Earth System Climate Model (UVic-ESCM), using a Latin hypercube samplin…
View article: Reanalysis of vertical mixing in mesocosm experiments: PeECE III and KOSMOS 2013
Reanalysis of vertical mixing in mesocosm experiments: PeECE III and KOSMOS 2013 Open
Controlled manipulation of environmental conditions within large enclosures in the ocean, so-called pelagic mesocosms, has become a standard method to explore potential responses of marine plankton communities to anthropogenic change. Amon…
View article: Marvelous Marine Microgels: On the Distribution and Impact of Gel-Like Particles in the Oceanic Water-Column
Marvelous Marine Microgels: On the Distribution and Impact of Gel-Like Particles in the Oceanic Water-Column Open
Three-dimensional hydrogels of organic polymers have been suggested to affect a variety of processes in the ocean, including element cycling, microbial ecology, food-web dynamics, and air-sea exchange. However, their abundance and distribu…