Andreas Held
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View article: Direct measurement of bidirectional turbulent fluxes of atmospheric cluster ions
Direct measurement of bidirectional turbulent fluxes of atmospheric cluster ions Open
Atmospheric ions can play a role in atmospheric processes such as new particle formation. Turbulent flux measurements can help to quantify source and sink processes of atmospheric ions. In this study, we present for the first time eddy cov…
View article: Turbulent enhancement ratios used for characterizing local emission sources in a complex urban environment
Turbulent enhancement ratios used for characterizing local emission sources in a complex urban environment Open
In this study, we introduce the turbulent enhancement ratio (TER) as an experimental approach for characterizing local emission sources in complex urban environments, with a focus on the city of Innsbruck, Austria. The idea behind the appr…
View article: Particle flux–gradient relationships in the high Arctic: emission and deposition patterns across three surface types
Particle flux–gradient relationships in the high Arctic: emission and deposition patterns across three surface types Open
The Arctic is experiencing a warming much faster than the global average and aerosol–cloud–sea–ice interactions are considered to be one of the key features of the Arctic climate system. It is therefore crucial to identify particle sources…
View article: What Influences Microplastic Distribution in the Marine Environment? A Study Highlighting the Role of Fronts and Submesoscale Processes in the North Sea
What Influences Microplastic Distribution in the Marine Environment? A Study Highlighting the Role of Fronts and Submesoscale Processes in the North Sea Open
Microplastics (MPs) are pervasive contaminants, yet understanding their pathways and fate in the marine environment remains unclear. A key challenge is the lack of in-situ, complementary measurements linking MP quantification with oceanogr…
View article: Overview of Atmospheric Aerosol Observations during the ATWAICE Expedition in the Central Arctic
Overview of Atmospheric Aerosol Observations during the ATWAICE Expedition in the Central Arctic Open
Understanding aerosol particles in the Arctic is crucial due to their impact on the region’s radiative balance and their role in modifying cloud properties. These interactions drive unique feedback mechanisms that enhance Arctic warm…
View article: Particle flux-gradient relationships in the high Arctic: Emission and deposition patterns across three surface types
Particle flux-gradient relationships in the high Arctic: Emission and deposition patterns across three surface types Open
The Arctic is experiencing a warming much faster than the global average, and aerosol-cloud-sea-ice interactions are considered to be one of the key features of the Arctic climate system. It is therefore crucial to identify particle source…
View article: What influences the distribution of microplastics in the marine environment? An interdisciplinary study reveals key factors driving microplastic in the North Sea
What influences the distribution of microplastics in the marine environment? An interdisciplinary study reveals key factors driving microplastic in the North Sea Open
Microplastics (MP) are known to be ubiquitous. The pathways and fate of these contaminants in the marine environment are receiving increasing attention, but still knowledge gaps exist. In particular, the link between mass-based MP quantifi…
View article: Aerosol particle number concentration, ultrafine particle number fraction, and new particle formation measurements near the international airports in Berlin, Germany – First results from the BEAR study
Aerosol particle number concentration, ultrafine particle number fraction, and new particle formation measurements near the international airports in Berlin, Germany – First results from the BEAR study Open
Studies revealed airports as a prominent source of ultrafine particles (UFP), which can disperse downwind to residential areas, raising health concerns. To expand our understanding of how air traffic-related emissions influence total parti…
View article: The Turbulent Enhancement Ratio as a novel Approach for Characterizing Local Emission Sources in Complex Environments
The Turbulent Enhancement Ratio as a novel Approach for Characterizing Local Emission Sources in Complex Environments Open
In this study, we introduce the Turbulent Enhancement Ratio (TER) method as a new approach for characterizing local emission sources in complex urban environments, with a focus on the city of Innsbruck, Austria. The idea behind the approac…
View article: Vertical concentrations gradients and transport of airborne microplastics in wind tunnel experiments
Vertical concentrations gradients and transport of airborne microplastics in wind tunnel experiments Open
Microplastics are an ubiquitous anthropogenic material in the environment, including the atmosphere. Little work has focused on the atmospheric transport mechanisms of microplastic nor its dispersion, despite it being a potential pollutant…
View article: Atmospheric deposition studies of microplastics in Central Germany
Atmospheric deposition studies of microplastics in Central Germany Open
Emission of microplastics (MP) to the atmosphere, airborne transport, and subsequent deposition are now recognized. However, the temporal and spatial resolution of data on MP pollution and knowledge of their atmospheric behaviour and fate …
View article: Development of a cascade impactor optimized for size-fractionated analysis of aerosol metal content by total reflection X-ray fluorescence spectroscopy (TXRF)
Development of a cascade impactor optimized for size-fractionated analysis of aerosol metal content by total reflection X-ray fluorescence spectroscopy (TXRF) Open
A new cascade impactor has been developed with the arrangement of the classifying nozzles optimized for analysis of the collected particles by total reflection X-ray fluorescence (TXRF). TXRF offers detection limits in the range of a few p…
View article: Smartphone-Based Color Evaluation of Passive Samplers for Gases: A Review
Smartphone-Based Color Evaluation of Passive Samplers for Gases: A Review Open
The application of smartphone-based color evaluation of passive sampling devices for gases has only been sparsely reported. The present review aims to compile available publications with respect to the configuration of the passive samplers…
View article: Comment on ar-2024-9
Comment on ar-2024-9 Open
Abstract. Microplastics are an ubiquitous man-made material in the environment, including the atmosphere. Little work focused on the atmospheric transport mechanisms of microplastics and its dispersion, despite being a potential pollutant.…
View article: Potential sources and transport of atmospheric microplastics in the North Atlantic Ocean
Potential sources and transport of atmospheric microplastics in the North Atlantic Ocean Open
The present study held in the frame of the JPI-Oceans FACTS examines the occurrence and long-range transport of microplastics (MP) in the North Atlantic Ocean. During a research cruise in 2021 seven transects along the Norwegian coast up t…
View article: Near-surface particle concentration profiles above the Arctic sea ice
Near-surface particle concentration profiles above the Arctic sea ice Open
The Arctic region is warming rapidly, and aerosol-cloud-sea-ice interactions are considered to be one of the key features of the Arctic climate system. It is therefore crucial to identify Arctic particle sources and sinks in order to study…
View article: Smartphone-Based Color Evaluation of Passive Samplers for Gases: A Review
Smartphone-Based Color Evaluation of Passive Samplers for Gases: A Review Open
The application of smartphone-based color evaluation of passive sampling devices for gases has only been sparsely reported. The present review aims to compile available publications with respect to the configuration of the passive samplers…
View article: Vertical concentrations gradients and transport of airborne microplastics in wind tunnel experiments
Vertical concentrations gradients and transport of airborne microplastics in wind tunnel experiments Open
Microplastics are an ubiquitous man-made material in the environment, including the atmosphere. Little work focused on the atmospheric transport mechanisms of microplastics and its dispersion, despite being a potential pollutant. We study …
View article: Interplay between disorder and electronic correlations in compositionally complex alloys
Interplay between disorder and electronic correlations in compositionally complex alloys Open
Exploring the intricate interplay between disorder and correlations in compositionally complex alloys, our study employs resonant and valence band photoemission, optical conductivity, and electrical resistivity, complemented by density fun…
View article: Water–air transfer rates of microplastic particles through bubble bursting as a function of particle size
Water–air transfer rates of microplastic particles through bubble bursting as a function of particle size Open
Microplastic (MP) particles can be ejected into the air by jet drops when gas bubbles burst at water surfaces. For a qualitative and quantitative understanding of this transport mechanism from the hydrosphere to the atmosphere, we studied …
View article: Impact of atmospheric water-soluble iron on α-pinene-derived SOA formation and transformation in the presence of aqueous droplets
Impact of atmospheric water-soluble iron on α-pinene-derived SOA formation and transformation in the presence of aqueous droplets Open
Increased secondary organic aerosol formation in the presence of soluble iron and H 2 O 2 acidic conditions in the aqueous phase.
View article: The Berlin-Brandenburg Air Study—A Methodological Study Paper of a Natural Experiment Investigating Health Effects Related to Changes in Airport-Related Exposures
The Berlin-Brandenburg Air Study—A Methodological Study Paper of a Natural Experiment Investigating Health Effects Related to Changes in Airport-Related Exposures Open
Objectives: This paper presents the study design of the Berlin-Brandenburg Air study (BEAR-study). We measure air quality in Berlin and Brandenburg before and after the relocation of aircraft (AC) traffic from Tegel (TXL) airport to the ne…