Heinke Schlünzen

Heinke Schlünzen
University of Hamburg | UHH · Meteorologisches Institut (MI)

Professor
Environmental meteorology focusing on air quality, urban climate, regenerative energy production incl. its effects

About

181
Publications
34,929
Reads
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4,615
Citations
Citations since 2017
43 Research Items
2251 Citations
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Publications

Publications (181)
Article
Full-text available
Convective precipitation events have been shown to intensify at rates exceeding the Clausius‐Clapeyron rate (CC‐rate) of ca. 7 %/K under current climate conditions. In this study, we relate atmospheric variables (low‐level dew point temperature, convective available potential energy, and vertical wind shear), which are regarded as ingredients for s...
Conference Paper
Full-text available
Die Veränderung von Landoberflächen kann einen profunden Einfluss auf das lokale und regionale Klima haben. Insbesondere Städte sind mit einer umfassenden Umgestaltung der lokalen Oberflächenstruktur verbunden, was im Zusammenspiel mit anthropogen Emissionen von strahlungsrelevanten Gasen und Partikeln zu einer deutlichen Modifikation der Energiebi...
Chapter
To assess processes and phenomenon in complex urban areas, obstacle resolving micro-scale models of the atmosphere are increasingly used. But the comparison of results of different obstacle resolving models (ORM) is hindered by the various data formats used for different models and approaches. For global model data a data standard exist within the...
Conference Paper
Full-text available
„Klima, Klimawandel und Gesellschaft“ (CLICCS) ist ein DFG-Exzellenzcluster an der Universität Hamburg, in dem gemeinsam mit Partner-Institutionen erforscht wird, wie sich das Klima ändert und mit ihm die Gesellschaft, die somit auf das Klima zurückwirkt. CLICCS umfasst sowohl Grundlagenforschung zur Klima- und Sozialdynamik als auch die transdiszi...
Technical Report
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For this volume, a survey was conducted among WMO Members in 2018 to judge the level of service provision in each area, the extent to which users and providers collaborate and the status of urban services currently provided. The common hazards that require Integrated Urban Services are identified as heavy rainfall, flooding, windstorms, tropical st...
Article
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Since the 1980s, the industrialization and urbanization of the Beijing area has entered a period of high-speed growth. This paper asks the question: How have such great changes in urban land-use over the past decades impacted urban precipitation? In this study, we investigate and analyze the effects of urbanization on the summer precipitation in Be...
Chapter
This chapter describes a new World Meteorological Organisation (WMO) approach to the provision of science-based services to assist the planning of safe, healthy, resilient and climate-friendly cities. The approach is outlined in full in the WMO Guidance on Integrated Urban Hydrometeorological, Climate and Environmental Services. Volume I, Concepts...
Article
Full-text available
The impact of urban areas on the global and regional climate has been assessed using the global atmospheric model CCAM including an urban canyon parameterization at 50 km resolution globally. Simulations were produced with and without urban areas to assess urban impacts for the historical period (1980‐2000). Two different land cover and urban datas...
Article
Full-text available
Modeling the urban system for urban health and well-being with the aim of finding ways to optimize the well-being of urban dwellers is a complex task. Different modeling approaches that consider specific parts of the urban system, e.g., environmental stressors, urban society, and urban morphology, need to be integrated. The conceptual model of heal...
Article
Integrated Urban hydrometeorological, climate and environmental Services (IUS) is a WMO initiative to aid development of science-based services to support safe, healthy, resilient and climate friendly cities. Guidance for Integrated Urban Hydrometeorological, Climate and Environmental Services (Volume I) has been developed with the intent to provid...
Chapter
This chapter focuses on evaluation guidelines developed in the field of environmental meteorology. Definitions for verification, validation, and evaluation as used in the field of environmental meteorology are given. A generic structure of a model evaluation guideline is introduced consisting of three parts: (A) Specification of application area, (...
Article
Full-text available
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 obstacle layer using Reynolds averaging. It explicitly resolves obstacles, including buildings and overhanging obsta...
Article
Full-text available
A thermally comfortable design of outdoor spaces favors social interaction and outdoor activities and thus contributes to the overall well-being of urban dwellers. To assess such a design, obstacle-resolving models (ORM) combined with thermal indices may be used. This paper reviews existing thermal indices to identify those suitable for thermal com...
Article
Full-text available
The 10th German Climate Conference (“10. Deutsche Klimatagung”, 10. DKT) took place in Hamburg in September 2015. The German Climate Conference is a series of conferences organized since 1989, bringing together German speaking climate scientists. This special issue presents a selection of contributions to the conference, representing the wide range...
Article
Full-text available
The local climate in cities differs from the one in rural areas, most prominently characterized by increased surface and air temperatures, known as the “(surface) urban heat island”. As climate has changed and continues to change in all areas of the world, the question arises whether the effects that are noticeable in urban areas are “homemade”, or...
Article
Full-text available
As a first step in modeling health-related urban well-being (UrbWellth), a mathematical model is constructed that dynamically simulates heat stress exposure of commuters in an idealized city. This is done by coupling the Simple Urban Radiation Model (SURM), which computes the mean radiant temperature ( T m r t ), with a newly developed multi-class...
Chapter
Full-text available
Weltweit lebt jeder zweite Mensch in einer Stadt; in Deutschland leben sogar etwa 76 % der Bevölkerung in städtischen Gebieten (◉ Abb. 3.1). Schätzungen der künftigen Bevölkerungsentwicklung zeigen eine noch stärker zunehmende Urbanisierung (◉ Abb. 3.1) mit geschätzten 8 von 10 Bürgern, die bis zur Mitte dieses Jahrhunderts in Deutschland in einem...
Article
Full-text available
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 obstacles layer using Reynolds averaging. It explicitly resolves obstacles, including buildings and overhanging ob...
Article
Full-text available
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 atmosphere. In order to quantify the biogenic emissions of CH3Cl and CH2Cl2 from mangroves, field measurement were co...
Article
Full-text available
Die europäische Luftqualitätsrichtlinie 2008/50/EG sieht die Ausbreitungsrechnung als Werkzeug zur Unterstützung der Beurteilung der Luftqualität, Luftreinhalteplanung und Vorhersage. Um neben der einheitlichen Beurteilung mittels standardisierter Messverfahren auch eine einheitliche modellierungstechnische Einschätzung der Luftqualität zu ermöglic...
Article
Full-text available
Online coupled meteorology atmospheric chemistry models have greatly evolved in recent years. Although mainly developed by the air quality modeling community, these integrated models are also of interest for numerical weather prediction and climate modeling as they can consider both the effects of meteorology on air quality, and the potentially imp...
Article
Full-text available
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 their health-related urban well-being (UrbWellth). The conceptual model introduced in this paper systematizes...
Article
Full-text available
Regional climate models provide climate projections on a horizontal resolution in the order of 10 km. This is too coarse to sufficiently simulate urban climate related phenomena such as the urban heat island (UHI). Therefore, regional climate projections need to be downscaled. A statistical-dynamical method for the UHI was developed and applied to...
Chapter
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About 80 % of the population within the North Sea countries currently lives in an urban area and this percentage is projected to continue to rise. Urban areas are not only impacted by changes in regional climate but are themselves responsible for causing local modifications in regional climate resulting in the so-called ‘urban climate’. The urban c...
Article
Full-text available
Tides influence both the formation and development of sea breezes. The aim of this study is to investigate the tidal influence to decide which model complexity is needed to reproduce the main influence of tides in a numerical model of coastal meteorology. Two processes are considered: (a) the influence of tides on sea breezes through the effect of...
Technical Report
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At the symposium nearly all presentations included some elements of model evaluation. Sensitivity studies evaluating the impact of a new methodology (changed parameters/process descriptions/initial data/boundary data) on model performance, for example, used evaluation to determine, if the new methodology is leading to model results closer to realit...
Technical Report
Full-text available
Online coupled meteorology atmospheric chemistry models have undergone a rapid evolution in recent years. Although mainly developed by the air quality modelling community, these models are also of interest for numerical weather prediction and climate modelling as they can consider not only the effects of meteorology on air quality, but also the pot...
Chapter
Reliable meteorological model results are one pre-condition for a good air quality simulation. The achievable quality of the meteorological information determines how accurate a concentration simulation can be. Many meteorological services as well as research institutions perform model evaluations on a routine basis, but the outcomes are not always...
Poster
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Städte stehen im Laufe des 21. Jahrhunderts verschiedenen Herausforderungen gegenüber. Hierzu gehören klimatische und ökonomische Veränderungen ebenso wie der demographische und soziale Wandel. Damit verbundene Belastungen müssen als Grundlage für eine nachhaltige Stadtplanung und Stadtentwicklung berücksichtigt werden. Für einzelne Fragestellungen...
Article
Full-text available
Abstract This study reviews the top ranked meteorology and chemistry interactions in online coupled models recommended by an experts' survey conducted in COST Action EuMetChem and examines the sensitivity of those interactions during two pollution episodes: the Russian forest fires 25 Jul–15 Aug 2010 and a Saharan dust transport event from 1 Oct to...
Article
Full-text available
Wind farms impact the local meteorology by taking up kinetic energy from the wind field and by creating a large wake. The wake influences mean flow, turbulent fluxes and vertical mixing. In the present study, the influences of large offshore wind farms on the local summer climate are investigated by employing the mesoscale numerical model METRAS wi...
Conference Paper
Full-text available
Results are presented from a sea ice forecasting experiment combined with a field campaign undertaken in the Barents Sea in March 2014. The simulations were performed with the regional coupled atmosphere-sea ice-ocean model HAMMER, recently developed within the project IRO-2 dealing with ice forecast and route optimization. The model HAMMER is driv...
Article
Full-text available
We present a numerical method to use several chemical transport models of increasing accuracy and complexity in an adaptive way. In largest parts of the domain, a simplified chemical model may be used, whereas in certain regions a more complex model is needed for accuracy reasons. A mathematically derived error estimator measures the modeling error...
Thesis
Full-text available
In this work the model ASAM is enriched with new eddy viscosity based dynamic Smagorinsky subgrid-scale models. Therefore the model is more physically based to study atmospheric flow configurations at several atmospheric scales with main focus to urban scale flow with building-resolved resolution. The implemented dynamic procedures work well and sh...
Article
Full-text available
Online coupled mesoscale meteorology atmospheric chemistry models have undergone a rapid evolution in recent years. Although mainly developed by the air quality modelling community, these models are also of interest for numerical weather prediction and regional climate modelling as they can consider not only the effects of meteorology on air qualit...
Chapter
For the simulation of photochemically created pollutants like ozone it is essential to correctly consider reaction rates induced by short-wave radiation. In atmospheric chemistry transport models this is achieved by the use of either off- or online calculated photolysis frequencies. In this study the effect of different input parameters of a radiat...
Article
The microscale transport and stream model MITRAS has been improved and a new technique has been implemented to improve numerical stability for complex obstacle configurations. Results of the updated version have been compared with wind tunnel data using an evaluation method that has been established for simple obstacle configurations. MITRAS is a p...
Article
Urban areas have well‐documented effects on climate, such as the urban heat island (UHI) effect, reduction of wind speeds, enhanced turbulence and boundary layer heights, and changes in cloud cover and precipitation. The aim of this study is to quantify the impact of the urban area of London on local and regional climate. This is achieved through t...
Article
Full-text available
The simulation of the coupled evolution of atmospheric dynamics, pollutant transport, chemical reactions and atmospheric composition is one of the most challenging tasks in environmental modelling, climate change studies, and weather forecasting for the next decades as they all involve strongly integrated processes. Weather strongly influences air...
Article
Full-text available
The perceived temperature (PT) is a measure for the quantification of human thermal comfort developed by the German Meteorological Service (DWD). In the present article, the sensitivity of PT on air temperature, water vapour pressure, wind speed, mean radiant temperature, street canyon width, and building heights is investigated. The mesoscale atmo...
Article
Full-text available
The April 2013 Special Issue of Meteorologische Zeitschrift presents papers from METTOOLSVIII conference which took place at the Campus of the University of Leipzig in March 2012. Barh and colleagues show that for special tasks, unconventional measuring devices are helpful. They use speed of sound measurements to observe wind and temperature fields...
Article
Full-text available
A classification of weather patterns (WP) is derived that is tailored to best represent situations relevant for the urban heat island (UHI). Three different types of k-means-based cluster methods are conducted. The explained cluster variance is used as a measure for the quality. Several variables of the 700-hPa fields from the 40-yr ECMWF Re-Analys...
Conference Paper
Full-text available
http://x3t.net/documents/Roeber_2013_MITRAS.pdf
Article
For the assessment of regional climate change the reliability of the regional climate models needs to be known. The main goal of this paper is to evaluate the quality of climate model data that are used for impact research. Temperature, precipitation, total cloud cover, relative humidity, and wind speed simulated by the regional climate models Clim...
Article
Measurements from 27 stations taken in the coastal area of the Gulf of Valencia are utilized to characterize the typical coastal circulation systems observed in this area. The wind measurements are available in a resolution of 15 s at daytime and 5 min at nighttime and cover the period of May 2006–April 2007. The analysis of median daily cycles sho...
Article
A linear statistical model relating the nocturnal urban heat island (UHI) intensity of Hamburg with meteorological conditions is constructed from observations taken by the German Meteorological Service (DWD). To find the appropriate predictors the relationship between different meteorological variables and the UHI of Hamburg is analyzed. Results an...