A5015238894- Atmospheric chemistry and aerosols
- Atmospheric aerosols and clouds
- Atmospheric Ozone and Climate
- Air Quality and Health Impacts
- Sperm and Testicular Function
- Atmospheric and Environmental Gas Dynamics
- Icing and De-icing Technologies
- Reproductive Biology and Fertility
- Maritime Transport Emissions and Efficiency
- Air Quality Monitoring and Forecasting
- Molecular Junctions and Nanostructures
- Advanced biosensing and bioanalysis techniques
- Vehicle emissions and performance
- Bee Products Chemical Analysis
- Oil Spill Detection and Mitigation
- Sodium Intake and Health
- Bayesian Modeling and Causal Inference
- Advanced Proteomics Techniques and Applications
- Marine and coastal ecosystems
- Engineering Education and Curriculum Development
- Reproductive Health and Technologies
- Membrane Separation Technologies
- Advanced Power Generation Technologies
- Family and Disability Support Research
- Problem and Project Based Learning
Ho Chi Minh City University of Technology and Education
2024
Aarhus University
2011-2023
Danish Technological Institute
2023
Stockton University
2023
University of Veterinary Medicine Hannover, Foundation
2016-2022
University of Göttingen
2016-2022
Australian National University
2021
UNSW Sydney
2005-2006
Abstract. The Arctic environment has an amplified response to global climatic change. It is sensitive human activities that mostly take place elsewhere. For this study, a multi-year set of observed aerosol number size distributions in the diameter range 10 500 nm from five sites around Ocean (Alert, Villum Research Station – Nord, Zeppelin, Tiksi and Barrow) was assembled analysed.A cluster analysis revealed four distinct distributions. Together with Lagrangian air parcel back-trajectories,...
Abstract. Sources, composition and occurrence of secondary organic aerosols in the Arctic were investigated at Zeppelin Mountain, Svalbard, Station Nord, northeastern Greenland, during full annual cycle 2008 2010, respectively. Speciation acids, organosulfates nitrooxy – from both anthropogenic biogenic precursors focus. A total 11 acids (terpenylic acid, benzoic phthalic pinic suberic azelaic adipic pimelic pinonic diaterpenylic acid acetate 3-methyl-1,2,3-butanetricarboxylic acid), 12 1...
Sea spray aerosol (SSA) emission is a complex process affected by various controlling factors. This work seeks to deconvolute some of this complexity in controlled laboratory setting using plunging jet varying three key parameters, one at time: (1) air entrainment rate, (2) seawater temperature, and (3) biomass phytoplankton. The production SSA found vary linearly with rate. By normalizing the flux we observe nonlinear variation efficiency temperature minimum around 6-10 °C. For comparison,...
Abstract. In order to develop strategies for controlling and reducing Arctic air pollution, there is a need understand the basic mechanisms determining fate of pollution in Arctic. Sources atmospheric particles at Station Nord (81° 36' N, 16° 40' W) North East Greenland were evaluated two-year period from March 2008 February 2010. Source apportionment using Positive Matrix Factorization (PMF) COnstrained Physical REceptor Model (COPREM) was based on measurements black carbon, elements (Al,...
Abstract. This work presents an analysis of the physical properties sub-micrometer aerosol particles measured at high Arctic site Villum Research Station, Station Nord (VRS), northeast Greenland, between July 2010 and February 2013. The study focuses on particle number concentrations, size distributions occurrence new formation (NPF) events their seasonality in Arctic, where observations characterization such corresponding are rare understanding related processes is lacking.A clear...
Abstract. Measurements of equivalent black carbon (EBC) in aerosols at the high Arctic field site Villum Research Station (VRS) Nord North Greenland showed a seasonal variation EBC concentrations with maximum winter and spring ground level. Average measured were about 0.067 ± 0.071 for 0.011 0.009 summer period. These data obtained using multi-angle absorption photometer (MAAP). A similar pattern was found sulfate level during analyzed by ion chromatography. Here, average 0.485 0.397 0.112...
Abstract. Anthropogenic emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx) may affect concentration levels composition biogenic secondary organic aerosols (BSOA) through photochemical reactions with precursors to form organosulfates nitrooxy organosulfates. We investigated this influence in a field study from 19 May 22 June, 2011 at two sampling sites Denmark. Within the study, we identified substantial number acids, ambient urban curbside semi-rural background air. A high degree...
This study investigates the impact of fatty acids on cloud condensation nuclei (CCN) activity sea salt aerosol initial size 30, 50, 70 or 90 nm. Two major in marine environment, palmitic acid (C16) and stearic (C18), were investigated along with their unsaturated analogues palmitoleic oleic acid, respectively. Sea seed particles generated by aeration through a diffuser placed inside spray tank. Fatty added to via vapours heated flask at different temperatures. The diameters CCN before after...
Abstract Humic‐like substances (HULIS) are a complex group of relatively high molecular weight organic compounds which contribute considerably to the mass carbon (OC) and influence light‐absorbing properties aerosols. In this work, HULIS were investigated for first time in high‐Arctic atmosphere, focusing on chemical characterization contribution total suspended particle (TSP) using weekly aerosol samples collected at Station Nord, northeast Greenland every fourth week during 2010. Average...
Abstract This paper reports a study of the factors affecting analytical performance gold and glassy carbon electrodes modified with tripeptide Gly‐Gly‐His for detection copper ions. is attached to (GC) surface 4‐carboxyphenyl moieties or 3‐mercaptopropionic acid by reaction N‐terminal amine group peptide carboxylic groups monolayer via carbodiimide activation. X‐ray photoelectron spectroscopy was used characterize steps in biosensor fabrication. It found that sensor prepared on GC electrode...
The optimum storage temperature for liquid-preserved boar semen has been empirically determined to be between 15 and 20°C. Lower temperatures provide an advantage inhibit bacterial growth, but are regarded as critical due the high sensitivity of spermatozoa chilling injury. Higher supposed induce energy deficiency insufficient depression metabolic cell activity. However, experimental evidence alterations sperm's status in relation duration is missing. Therefore, we aimed revisit upper lower...
Abstract. Particles in the atmosphere are of concern due to their toxic properties and effects on climate. In coastal areas, ship emissions can be a significant anthropogenic source. this study we investigated contribution from total particle number mass concentrations at remote location. We studied concentration (12 490 nm diameter), 150 diameter) volume size distribution aerosol particles plumes for period 4.5 months Høvsøre, site western coast Jutland Denmark. During episodes winds, is...
Abstract. The knowledge of climate effects atmospheric aerosols is associated with large uncertainty, and a better understanding their physical chemical properties needed, especially in the Arctic environment. objective present study to improve our processes affecting composition high Arctic. Therefore size-segregated were sampled at site, Station Nord (Northeast Greenland), March 2009 using Micro Orifice Uniform Deposit Impactor. aerosol samples extracted order analyse three water-soluble...
Mammalian spermatozoa utilize ATP as the energy source for key functions on route to fertilization. and its precursor nucleotides ADP AMP are regularly investigated in sperm physiology studies, mostly by bioluminescence assays. Assay results vary widely, mainly due different efficiencies nucleotide extraction prevention of their enzymatic degradation. Here, we describe a revised, validated protocol efficient phosphatase inhibition adenine resulting consistently high concentrations exceeding...
Abstract. Sources, composition and occurrence of secondary organic aerosols (SOA) in the Arctic were investigated at Zeppelin Mountain, Svalbard, Station Nord, northeast Greenland, during full annual cycle 2008 2010 respectively. We focused on speciation three types SOA tracers: acids, organosulfates nitrooxy from both anthropogenic biogenic precursors, here presenting organosulfate concentrations compositions a chemical for first time. Aerosol samples analysed using High Performance Liquid...
Abstract. The Portable Ice Nucleation Chamber 2 (PINCii) is a newly developed continuous flow diffusion chamber (CFDC) for measuring ice nucleating particles (INPs). PINCii vertically oriented parallel-plate CFDC that has been engineered to improve upon the limitations of previous generations CFDCs. This work presents detailed description instrument and upgrades make it unique compared with other operational design offers several possibilities improved INP measurements. Notably, specific...
Abstract. In order to develop strategies for controlling and reducing Arctic air pollution, there is a need understand the basic mechanisms determining fate of pollution in Arctic. Sources atmospheric particles at Station Nord (81°36' N, 16°40' W) North East Greenland were evaluated two-year period from March 2008 February 2010. Source apportionment using Positive Matrix Factorization (PMF) COnstrained Physical Receptor Model (COPREM) was based on measurements black carbon, elements (Al, Si,...
Abstract. Particles in the atmosphere are of concern due to their toxic properties and effects on climate. In coastal areas ship emissions can be a significant anthropogenic source. this study we investigated contribution from total particle number mass concentrations at remote location. We studied concentration (12 490 nm diameter), 150 diameter) volume size distribution aerosol particles plumes for period four half months Høvsøre, site western coast Jutland Denmark. During episodes winds...
Abstract. Measurements of Black Carbon (BC) in aerosols at the high Arctic field site Villum Research Station (VRS) Nord North Greenland showed a seasonal variation BC concentrations with maximum winter and spring ground level. The data was obtained using Multi Angle Absorption Photometer (MAAP). A similar pattern found for sulfate level during analyzed by ion chromatography. correlation between observed over years 2011 to 2013. This finding gives hint that most likely transport primary...