John D. Hader

John D. Hader
Stockholm University | SU · Department of Environmental Science and Analytical Chemistry (ACES)

MS Atmospheric Science

About

17
Publications
2,123
Reads
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454
Citations
Introduction
Using computer modelling, I am investigating the impact of climate change and other aspects of environmental change on the fate and transport of and exposure to anthropogenic chemicals. I am also investigating the risk that industrial chemicals used upstream of sewage treatment plants pose to microorganisms used within the sewage treatment process. This work is within the ECORISK2050 Marie Skłodowska-Curie Innovative Training Network.
Additional affiliations
March 2019 - present
Stockholm University
Position
  • PhD Student
Description
  • Part of an international consortium of early-stage researchers within the ECORISK2050 Marie Skłodowska-Curie Innovative Training Network focusing on human and environmental risk to anthropogenic chemicals under different global change scenarios. Focus is on development of numerical modeling methods to explore scenarios of human and environmental chemical exposure. Additional focus is on understanding risks to sewage treatment systems posed from upstream industrial chemicals.
July 2016 - March 2019
ICF International
Position
  • Researcher
Description
  • Part of a team that conducted an inhalation exposure modeling study investigating the potential health impacts of exposure to VOCs emitted from oil and gas drilling operations in Colorado. Crucially involved in conducting human exposure modeling in support of the U.S. EPA's Risk and Technology Review and the review of the National Ambient Air Quality Standard for sulfur dioxide using various environmental fate and transport and exposure models (i.e., the TRIM.FaTE and APEX models, respectively).
January 2015 - July 2016
North Carolina State University
Position
  • Master's Student
Description
  • Designed computer algorithms for processing and visualization of large amounts (100s-1,000s of GB) of satellite-based and model-derived georeferenced data. Organized a team of 6 researchers to perform consistent, subjective analysis of 3 years of satellite imagery to quantifying newly-identified cloud formations with implications for the global radiation balance. Corresponded with scientists nationally and internationally regarding analysis techniques and data acquisition.
Education
April 2019 - March 2023
Stockholm University
Field of study
  • Environmental Science
August 2014 - May 2016
North Carolina State University
Field of study
  • Atmospheric Science
August 2010 - May 2014
North Carolina State University
Field of study
  • Meteorology

Publications

Publications (17)
Article
Full-text available
Recent studies have suggested that the ice-nucleating ability of some types of pollen is derived from non-proteinaceous macromolecules. These macromolecules may become dispersed by the rupturing of the pollen grain during wetting and drying cycles in the atmosphere. If true, this mechanism might prove to be a significant source of ice nuclei (IN) c...
Article
Full-text available
Immersion freezing is the most relevant heterogeneous ice nucleation mechanism through which ice crystals are formed in mixed-phase clouds. In recent years, an increasing number of laboratory experiments utilizing a variety of instruments have examined immersion freezing activity of atmospherically relevant ice-nucleating particles. However, an int...
Article
We document rapid and dramatic clearings of large portions of the subtropical marine low cloud deck that have implications for the global radiation balance and climate sensitivity. Over the southeast Atlantic, large areas of stratocumulus are rapidly eroded, yielding partial or complete clearing along sharp transitions hundreds to thousands of kilo...
Article
Full-text available
Prevalence of end-stage renal disease (ESRD) in the US increased by 74% from 2000 to 2013. To investigate the role of the broader environment on ESRD survival time, we evaluated average distance to the nearest hospital by county (as a surrogate for access to healthcare) and the Environmental Quality Index (EQI), an aggregate measure of ambient envi...
Article
Some states and localities restrict siting of new oil and gas (O&G) wells relative to public areas. Colorado includes a 500-foot exception zone for building units, but it is unclear if that sufficiently protects public health from air emissions from O&G operations. To support reviews of setback requirements, this research examines potential health...
Article
Full-text available
European agricultural development in the 21st century will be affected by a host of global changes, including climate change, changes in agricultural technologies and practices, and a shift towards a circular economy. The type and quantity of chemicals used, emitted, and cycled through agricultural systems in Europe will change, driven by shifts in...
Article
By 2050, the global population is predicted to reach nine billion, with almost three quarters living in cities. The road to 2050 will be marked by changes in land use, climate, and the management of water and food across the world. These global changes (GCs) will likely affect the emissions, transport, and fate of chemicals, and thus the exposure o...
Article
By 2050, the global population is predicted to reach nine billion, with almost three quarters living in cities. The road to 2050 will be marked by changes in land use, climate, and the management of water and food across the world. These global changes (GCs) will likely affect the emissions, transport, and fate of chemicals, and thus the exposure o...
Article
Full-text available
The use of aligned exposure science terminology is crucial for ease of comparison and appropriate interpretation of exposure information, regulatory reports, and scientific publications. Sometimes the use of different terminology in different contexts and areas of exposure science results in diverging interpretations of the same descriptor. During...
Data
Hazard ratios for ESRD and total EQI stratified by age and distance to the nearest hospital (1,092,281 patients, 2000–2013). aHR (95% CI) = Hazard ratio (95% Confidence Interval). (DOCX)
Data
Hazard ratios for ESRD and total EQI stratified by rural versus urban location and distance to the nearest hospital (1,092,281 patients, 2000–2013). aHR (95% CI) = Hazard ratio (95% Confidence Interval). (DOCX)
Data
Adjusted survival curves for all patients developed using the full model, stratified by distance to the nearest hospital and rurality. Quantiles were generated using the total EQI. (Left) Patients with nearest hospital under 10 miles away, (Right) Patients with nearest hospital over 20 miles away. (Top) Urban counties, (Bottom) Rural counties. (EPS...
Data
Adjusted survival curves for all patients developed using the full model, stratified by distance to the nearest hospital and age at first ESRD service date. Quantiles were generated using the total EQI. (Left) Patients with nearest hospital under 10 miles away, (Right) Patients with nearest hospital over 20 miles away. (Top) Patients aged 18–39, (M...
Article
Full-text available
Immersion freezing is the most relevant heterogeneous ice nucleation mechanism through which ice crystals are formed in mixed-phase clouds. In recent years, an increasing number of laboratory experiments utilizing a variety of instruments have examined immersion freezing activity of atmospherically relevant ice nucleating particles (INPs). However,...
Article
Full-text available
Recent studies have suggested that the ice nucleating ability of some types of pollen is derived from non-proteinaceous macromolecules. These macromolecules may become dispersed by the rupturing of the pollen sac during wetting and drying cycles in the atmosphere. If true, this mechanism might prove to be a significant source of ice nuclei (IN) con...
Article
present new measurements of the time dependence of the ice-nucleating ability of a wide range of materials including the minerals montmorillonite and kaolinite, the biological proxy ice nuclei Icemax, and flame soot generated from the incomplete combustion of ethylene gas. We also present time dependence for ambient ice nuclei collected from rainwa...

Network

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Projects

Project (1)
Project
ECORISK2050 is a European Union-funded project in the framework of the Horizon 2020 Marie Skłodowska-Curie Actions – Innovative Training Networks. Within this project, we aim to: - Assess how the emissions, fate, transport, and uptake of chemicals from agricultural and urban environments will be affected by global change (GC), and assess the associated risks - Identify adaptation and mitigation strategies and develop robust implementation pathways to abate unacceptable changes in risks for all GC scenarios - Develop a set of tools for use by industry and policy makers to assess and manage GC-related chemical risks Learn more at our website: https://ecorisk2050.eu/ Follow us on Twitter: @EcoItn