David Grawe
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View article: Harmonisation of historical and future emission data for climate and air quality modelling
Harmonisation of historical and future emission data for climate and air quality modelling Open
Climate change and air quality research are closely related research areas that have often been investigated with different objectives. However, addressing both topics as a joint approach can lead to synergies and help to avoid counteracti…
View article: Development of a high-resolution model system for assessing an urban flood event in past and future climate
Development of a high-resolution model system for assessing an urban flood event in past and future climate Open
On May 10th, 2018, Lohbrügge, a city quarter in the eastern part of Hamburg, Germany, was hit by a local heavy rainfall event. Within a short time, the sewer system was overloaded and parts of Lohbrügge were flooded. Meanwhile, city quarte…
View article: Modelling the variability of particle concentrations from tyre and brake wear for Hamburg
Modelling the variability of particle concentrations from tyre and brake wear for Hamburg Open
Air pollution is a global threat to human health, especially in densely populated areas. Pollutant concentrations in European countries have been decreased due to legislative actions. However, non-exhaust emissions, consisting of tyre, bra…
View article: A method for assessing model extensions: Application to modelling winter precipitation with a microscale obstacle-resolving meteorological model (MITRAS v4.0)
A method for assessing model extensions: Application to modelling winter precipitation with a microscale obstacle-resolving meteorological model (MITRAS v4.0) Open
The microscale, obstacle-resolving meteorological transport and stream model MITRAS has been extended with a snow cover and precipitation scheme. The performance of the model extension is assessed by comparing the results of different mode…
View article: Variability of aerosol particle concentrations from tyre and brake wear emissions in an urban area
Variability of aerosol particle concentrations from tyre and brake wear emissions in an urban area Open
Air pollution is a risk to human health, especially in urban areas. While exhaust emissions from road traffic have decreased over the last decades, non-exhaust emissions remain and tend to increase. In this study, tyre and brake wear emiss…
View article: Estimation of particle concentrations from tyre and brake wear in an urban environment
Estimation of particle concentrations from tyre and brake wear in an urban environment Open
Air pollution is threatening human health worldwide, especially in urban areas. Legislative actions have successfully decreased pollutant concentrations in European countries. However, while exhaust emissions from road traffic have decreas…
View article: Harmonisation of historical and future emission data for climate and air quality modelling
Harmonisation of historical and future emission data for climate and air quality modelling Open
Climate change and air quality research are closely related research areas that have often been investigated with different objectives. However, addressing both topics as a joint approach can lead to synergies and help to avoid counteracti…
View article: Survey On Output Data From Obstacle Resolving Atmospheric Models
Survey On Output Data From Obstacle Resolving Atmospheric Models Open
Obstacle resolving micro-scale atmospheric models (ORMs) are important to assess atmospheric processes within urban areas. However, the data generated from such models are not standardised yet and existing data standards do not fit properl…
View article: Parameterizing building effects on airflows within the urban canopy layer for high‐resolution models using a nudging approach
Parameterizing building effects on airflows within the urban canopy layer for high‐resolution models using a nudging approach Open
In this study, a new multilayer urban canopy parameterization for high‐resolution (∼1 km) atmospheric models using the nudging approach to represent the impacts of urban canopies on airflow is presented. In our parameterization, a nudging …
View article: Urban induced modification of precipitation - Findings from a systematic literature review with focus on studies from the last decade
Urban induced modification of precipitation - Findings from a systematic literature review with focus on studies from the last decade Open
<p>Changing land surfaces can have a profound impact on local and regional climates. Cities in particular are associated with a comprehensive transformation of the local surface structure, which, in combination with anthropogenic emi…
View article: Parameterizing the impact of heterogeneous urban canopies on local climate using nudging
Parameterizing the impact of heterogeneous urban canopies on local climate using nudging Open
<p>A multi-layer urban canopy parameterization using a nudging approach has been developed and integrated into the mesoscale atmospheric model METRAS to improve the urban surface representation. Through modifying the existing nudging…
View article: Effects of vertical ship exhaust plume distributions on urban pollutant concentration – a sensitivity study with MITRAS v2.0 and EPISODE-CityChem v1.4
Effects of vertical ship exhaust plume distributions on urban pollutant concentration – a sensitivity study with MITRAS v2.0 and EPISODE-CityChem v1.4 Open
The modeling of ship emissions in port areas involves several uncertainties and approximations. In Eulerian grid models, the vertical distribution of emissions plays a decisive role for the ground-level pollutant concentration. In this stu…
View article: Effects of vertical ship exhaust plume distributions on urban pollutant concentration – a sensitivity study with MITRAS v2.0 and EPISODE-CityChem v1.4
Effects of vertical ship exhaust plume distributions on urban pollutant concentration – a sensitivity study with MITRAS v2.0 and EPISODE-CityChem v1.4 Open
The modeling of ship emissions in port areas involves several uncertainties and approximations. In Eulerian grid models, the vertical distribution of emissions plays a decisive role for the ground-level pollutant concentration. In this stu…
View article: How to develop and apply a model data standard on microscale model data.
How to develop and apply a model data standard on microscale model data. Open
<p>Numerical modeling makes it possible to represent complex processes in small-scale and complex areas like cities. For resolving obstacles, grid sizes in the order of meters are needed. Due to small grid sizes and numerical restric…
View article: Parameterizing the impact of vegetated urban canopies on wind and temperature fields by using a simple nudging method
Parameterizing the impact of vegetated urban canopies on wind and temperature fields by using a simple nudging method Open
<p>Nudging is a simple method that aims to dynamically adjust the model toward the observations by including an additional feedback term in the model governing equation. This method is widely applied in data assimilation due to its s…
View article: Parameterizing the vertical downward dispersion of ship exhaust gas in the near field
Parameterizing the vertical downward dispersion of ship exhaust gas in the near field Open
Estimating the impact of ship emissions on local air quality is a topic of high relevance, especially in large harbor cities. For chemistry-transport modeling studies, the initial plume rise and dispersion play a crucial role for the distr…
View article: First results of a model user survey on a micro-scale model data standard
First results of a model user survey on a micro-scale model data standard Open
Earth and Space Science Open Archive posterOpen AccessYou are viewing the latest version by default [v1]First results of a model user survey on a micro-scale model data standardAuthorsVivienVossiDK. HeinkeSchlünzeniDDavidGraweiDDanielHeyde…
View article: Parameterizing the vertical downward dispersion of ship exhaust gas in the near-field
Parameterizing the vertical downward dispersion of ship exhaust gas in the near-field Open
Estimating the impact of ship emissions on local air quality is a topic of high relevance, especially in large harbour cities. For chemistry transport modeling studies, the initial plume rise and dispersion play a crucial role for the dist…
View article: Assessment of heterogenity of air pollution within an urban canopy
Assessment of heterogenity of air pollution within an urban canopy Open
<p>Air pollution is an important topic within urban areas.&#160; Limit values as given in the European Guidelines are introduced to reduce negative effects on humans and vegetation.&#160; Exceedances of the limit values are t…
View article: Characterizing the vertical concentration profiles of ship plumes with a microscale model - is it all Gaussian?
Characterizing the vertical concentration profiles of ship plumes with a microscale model - is it all Gaussian? Open
<p>Accurate modeling of ship emissions is a topic of increasing interest due to the ever-growing global fleet and its emission of air pollutants. With the increasing calculation power of modern computers, numerical grid models can no…
View article: A European Threshold Value and Assessment Method for Macro Litter on Coastlines.
A European Threshold Value and Assessment Method for Macro Litter on Coastlines. Open
The Marine Strategy Framework Directive (MSFD, 2008/56/EC) requires that European threshold values (TVs) for marine litter (descriptor 10) be defined. The MSFD Technical Group on Marine Litter (TG ML) decided to focus on coastline litter (…
View article: The microscale obstacle-resolving meteorological model MITRAS v2.0: model theory
The microscale obstacle-resolving meteorological model MITRAS v2.0: model theory Open
This paper describes the developing theory and underlying processes of the microscale obstacle-resolving model MITRAS version 2. MITRAS calculates wind, temperature, humidity, and precipitation fields, as well as transport within the obsta…
View article: The Microscale Obstacle Resolving Meteorological Model MITRAS:Model Theory
The Microscale Obstacle Resolving Meteorological Model MITRAS:Model Theory Open
This paper describes the developing theory and the underlying processes of the microscale obstacle resolving model MITRAS Version 2. MITRAS calculates wind, temperature, humidity and precipitation fields as well as transport within the obs…
View article: Determination of chloromethane and dichloromethane in a tropical terrestrial mangrove forest in Brazil by measurements and modelling
Determination of chloromethane and dichloromethane in a tropical terrestrial mangrove forest in Brazil by measurements and modelling Open
Chloromethane (CH3Cl) and dichloromethane (CH2Cl2) are known to have both natural and anthropogenic sources to the atmosphere. From recent studies it is known that tropical and sub tropical plants are primary sources of CH3Cl in the atmosp…
View article: A Conceptual Modeling Approach to Health-Related Urban Well-Being
A Conceptual Modeling Approach to Health-Related Urban Well-Being Open
In cities, social well-being faces obstacles posed by globalization, demographic and climate change, new forms of social organization, and the fragmentation of lifestyles. These changes affect the vulnerability of city societies and impact…
View article: Review of CFD Guidelines for Dispersion Modeling
Review of CFD Guidelines for Dispersion Modeling Open
This is the review of CFD (Computational Fluid Dynamics) guidelines for dispersion modeling in the USA, Japan and Germany. Most parts of this review are based on the short report of the special meeting on CFD Guidelines held at the Interna…