A5052238773- Marine and coastal ecosystems
- Ocean Acidification Effects and Responses
- Atmospheric and Environmental Gas Dynamics
- Methane Hydrates and Related Phenomena
- Oceanographic and Atmospheric Processes
- Atmospheric Ozone and Climate
- Marine Biology and Ecology Research
- Ionosphere and magnetosphere dynamics
- Atmospheric chemistry and aerosols
- Groundwater and Isotope Geochemistry
- Arctic and Antarctic ice dynamics
- Wastewater Treatment and Nitrogen Removal
- Microbial Community Ecology and Physiology
- Spectroscopy and Laser Applications
- Geological Studies and Exploration
- Geophysics and Gravity Measurements
- Earthquake Detection and Analysis
- Arctic and Russian Policy Studies
- Cardiovascular and Diving-Related Complications
- Coastal and Marine Management
- Analytical Chemistry and Sensors
- Hydrocarbon exploration and reservoir analysis
- Solar and Space Plasma Dynamics
- Agriculture Sustainability and Environmental Impact
- Environmental and Cultural Studies in Latin America and Beyond
GEOMAR Helmholtz Centre for Ocean Research Kiel
2015-2024
Radboud University Nijmegen
2022-2024
Kiel University
2021-2024
Universidad de Bogotá Jorge Tadeo Lozano
2008-2016
Abstract. The climate active trace-gas carbonyl sulfide (OCS) is the most abundant sulfur gas in atmosphere. A missing source its atmospheric budget currently suggested, resulting from an upward revision of vegetation sink. Tropical oceanic emissions have been proposed to close gap budget. We present a bottom-up approach including (i) new observations OCS surface waters tropical Atlantic, Pacific and Indian oceans (ii) further improved global box model show that direct are unlikely account...
1. Abstract Nitrous oxide (N2O) is an important atmospheric trace gas involved in tropospheric warming and stratospheric ozone depletion. Estimates of the global ocean contribution to N2O emissions average 21 % (range: 10 53 %). Ongoing environmental changes such as warming, deoxygenation acidification are affecting oceanic cycling atmosphere. International activities over last decades aimed at improving estimates emissions, including (i) MarinE MethanE NiTrous Oxide database (MEMENTO) for...
Abstract. Oxygen-deficient zones (ODZs) are major sites of net natural nitrous oxide (N2O) production and emissions. In order to understand changes in the magnitude N2O response global change, knowledge on individual contributions microbial pathways (nitrification denitrification) their regulation is needed. ODZ coastal area off Peru, sensitivity oxygen organic matter was investigated using 15N tracer experiments combination with quantitative PCR (qPCR) microarray analysis total active...
The air–sea exchange and oceanic cycling of greenhouse gases (GHG), including carbon dioxide (CO2), nitrous oxide (N2O), methane (CH4), monoxide (CO), nitrogen oxides (NOx = NO + NO2), are fundamental in controlling the evolution Earth’s atmospheric chemistry climate. Significant advances have been made over last 10 years understanding, instrumentation methods, as well deciphering production consumption pathways GHG upper ocean (including surface subsurface down to approximately 1000 m)....
Abstract. A new system for continuous, highly resolved oceanic and atmospheric measurements of N2O, CO CO2 is described. The based upon off-axis integrated cavity output spectroscopy (OA-ICOS) a non-dispersive infrared analyzer (NDIR), both coupled to Weiss-type equilibrator. Performance the combined setup was evaluated by testing its precision, accuracy, long-term stability, linearity response time. Furthermore, tested during two oceanographic campaigns in equatorial Atlantic Ocean order...
Abstract. Large-scale climatic forcing is impacting oceanic biogeochemical cycles and expected to influence the water-column distribution of trace gases, including methane nitrous oxide. Our ability as a scientific community evaluate changes in inventories oxide depends largely on our capacity obtain robust accurate concentration measurements that can be validated across different laboratory groups. This study represents first formal international intercomparison whereby participating...
Abstract. Depth profiles of nitrous oxide (N2O) were measured during six cruises to the upwelling area and oxygen minimum zone (OMZ) off Peru in 2009 2012/2013, covering both coastal shelf region adjacent open ocean. N2O displayed a strong sensitivity towards concentrations. Open ocean with distances break larger than first baroclinic Rossby radius deformation showed transition from broad maximum close Equator double-peak structure south 5° S where was more pronounced. Maximum concentrations...
Abstract The Benguela Upwelling System (BUS) is the most productive of all eastern boundary upwelling ecosystems and it hosts a well‐developed oxygen minimum zone. As such, BUS potential hotspot for production N 2 O, potent greenhouse gas derived from microbially driven decay sinking organic matter. Yet, extent at which near‐surface waters emit O to atmosphere in highly uncertain. Here we present first high‐resolution surface measurements across northern part (nBUS). We found strong...
Abstract. For millennia, humans have gravitated towards coastlines for their resource potential and as geopolitical centres global trade. A basic requirement ensuring water security coastal communities relies on a delicate balance between the supply demand of potable water. The interaction freshwater saltwater in settings is, therefore, complicated by both natural human-driven environmental changes at land–sea interface. In particular, ongoing sea-level rise, warming deoxygenation might...
Abstract. In the current era of rapid climate change, accurate characterization climate-relevant gas dynamics – namely production, consumption, and net emissions is required for all biomes, especially those ecosystems most susceptible to impact change. Marine environments include regions that act as sources or sinks numerous climate-active trace gases including methane (CH4) nitrous oxide (N2O). The temporal spatial distributions CH4 N2O are controlled by interaction complex biogeochemical...
Abstract. Recent observations in the eastern tropical South Pacific (ETSP) have shown key role of meso- and submesoscale processes (e.g. eddies) shaping its hydrographic biogeochemical properties. Off Peru, elevated primary production from coastal upwelling combination with sluggish ventilation subsurface waters fuels a prominent oxygen minimum zone (OMZ). Given that nitrous oxide (N2O) production–consumption water column are sensitive to (O2) concentrations, ETSP is region particular...
Abstract. Carbon monoxide (CO) influences the radiative budget and oxidative capacity of atmosphere over Arctic Ocean, which is a source atmospheric CO. Yet, oceanic CO cycling understudied in this area, particularly light ongoing rapid environmental changes. We present results from incubation experiments conducted Fram Strait August–September 2019 under different conditions: while lower pH did not affect production (GPCO) or consumption (kCO) rates, enhanced GPCO kCO were positively...
In order to determine the influence of ocean and atmospheric coupling dynamics on upwelling events, caused by Ekman’s transport continental winds, as well possible fertilization effect produced increasing concentration inorganic nutrients in coastal waters Gaira’s inlet, Magdalena department, during minor dry season 2006, atmospheric, oceanographic, biological variables were measured implementation Eurelian method. A total four samplings carried out, among which two presented oceanic...
Abstract. The open ocean is a major source of nitrous oxide (N2O), an atmospheric trace gas attributable to global warming and ozone depletion. Intense sea-to-air N2O fluxes occur in oceanic upwelling regions such as the eastern tropical South Pacific (ETSP). ETSP influenced by El Niño–Southern Oscillation that leads inter-annual variations physical, chemical, biological properties water column. In October 2015, strong Niño event was developing ETSP; we conduct field observations investigate...
Human activities are changing the Arctic environment at an unprecedented rate resulting in rapid warming, freshening, sea ice retreat and ocean acidification of Ocean. Trace gases such as nitrous oxide (N2O) methane (CH4) play important roles both atmospheric reactivity radiative budget thus have a high potential to influence region's climate. However, little is known about how these physical chemical changes will impact emissions major climate-relevant trace from The combined consequences...
Abstract Methane (CH 4 ) is a climate‐relevant trace gas that emitted from the open and coastal oceans in considerable amounts. However, its distribution remote oceanic areas largely unknown. To fill this knowledge gap, dissolved CH was measured at nine stations 75°S Ross Sea during austral summer January 2020. undersaturation (mean: 82 ± 20%) found throughout water column. In subsurface waters, of mainly resulted mixing masses situ consumption, whereas concentrations surface mixed layer...
Abstract The tropical Atlantic exerts a major influence in climate variability through strong air‐sea interactions. Within this region, the eastern side of equatorial band is characterized by seasonality, whereby most prominent feature annual development cold tongue (ACT). This low sea surface temperatures (∼22–23°C) typically associated with upwelling‐driven enhancement nutrient concentrations and primary production. Based on detailed investigation distribution sea‐to‐air fluxes N 2 O...
From 2008 to 2019, a comprehensive research project, ‘SFB 754, Climate – Biogeochemistry Interactions in the Tropical Ocean,’ was funded by German Research Foundation investigate climate-biogeochemistry interactions tropical ocean with particular emphasis on processes determining oxygen distribution. During three 4-year long funding phases, consortium of more than 150 scientists conducted or participated 34 major cruises and collected wealth physical, biological, chemical, meteorological...
Abstract Upward transport and/or mixing of trace gas‐enriched subsurface waters fosters the exchange nitrous oxide (N 2 O) and methane (CH 4 ) with atmosphere in Eastern‐South Atlantic (ESA). To date, it is, however, unclear whether this source is maintained by local production or advection water masses. The meridional zonal variability N O CH ESA were investigated to identify contributions major regional masses overall budget . maximal sea surface concentrations main upwelling cells...