Norbert Kalthoff
YOU?
Author Swipe
View article: A new versatile dropsonde for atmospheric soundings – the KITsonde
A new versatile dropsonde for atmospheric soundings – the KITsonde Open
A new modular multi-sensor aerological dropsonde system for high and fast-flying research aircraft has been developed for studying atmospheric processes. This new system allows us to drop release containers with up to four sondes inside, a…
View article: A New Versatile Dropsonde for Atmospheric Soundings with HALO – The KITsonde
A New Versatile Dropsonde for Atmospheric Soundings with HALO – The KITsonde Open
A new modular multi-sensor aerological dropsonde system for high and fast-flying research aircraft has been developed for studying atmospheric processes. This new system allows to drop release containers with up to 4 sondes inside and data…
View article: Evaluation of the Urban Climate Model PALM-4U over Hilly Terrain Using Wind and Turbulence Observations
Evaluation of the Urban Climate Model PALM-4U over Hilly Terrain Using Wind and Turbulence Observations Open
We used boundary layer observations in the Stuttgart area from two summer episodes for model evaluation of the urban climate model PALM-4U. In summer 2017, radiosondes and Doppler lidars were operated, and the lidar virtual tower technique…
View article: Exploring the daytime boundary layer evolution based on Doppler spectrum width from multiple coplanar wind lidars during CROSSINN
Exploring the daytime boundary layer evolution based on Doppler spectrum width from multiple coplanar wind lidars during CROSSINN Open
Over heterogeneous, mountainous terrain, the determination of spatial heterogeneity of any type of a turbulent layer has been known to pose substantial challenges in mountain meteorology. In addition to the combined effect in which buoyanc…
View article: Exploring the daytime boundary layer evolution based on Doppler spectrum width from multiple coplanar wind lidars during CROSSINN
Exploring the daytime boundary layer evolution based on Doppler spectrum width from multiple coplanar wind lidars during CROSSINN Open
Over heterogeneous, mountainous terrain, the determination of spatial heterogeneity of any type of a turbulent layer has been known to pose substantial challenges in mountain meteorology. In addition to the combined effect in which buoyanc…
View article: Meteorological and air quality measurements in a city region with complex terrain: influence of meteorological phenomena on urban climate
Meteorological and air quality measurements in a city region with complex terrain: influence of meteorological phenomena on urban climate Open
On 8 and 9 July 2018 extensive observations were conducted under fair-weather conditions in the German city of Stuttgart and its surroundings. This intensive observation period, part of the four weeks Urban Climate Under Change (UC)2 campa…
View article: Process Studies of the Impact of Land-Surface Resolution on Convective Precipitation Based on High-Resolution ICON Simulations
Process Studies of the Impact of Land-Surface Resolution on Convective Precipitation Based on High-Resolution ICON Simulations Open
This study investigated the relevant processes responsible for differences of convective precipitation caused by land-surface resolution. The simulations were performed with the ICOsahedral Nonhydrostatic model (ICON) with grid spacing of …
View article: A Collaborative Effort to Better Understand, Measure, and Model Atmospheric Exchange Processes over Mountains
A Collaborative Effort to Better Understand, Measure, and Model Atmospheric Exchange Processes over Mountains Open
In this essay, we highlight some challenges the atmospheric community is facing concerning adequate treatment of flows over mountains and their implications for numerical weather prediction (NWP), climate simulations, and impact modeling. …
View article: Nocturnal atmospheric conditions and their impact on air pollutant concentrations in the city of Stuttgart
Nocturnal atmospheric conditions and their impact on air pollutant concentrations in the city of Stuttgart Open
Meteorological and air pollutant measurements were conducted in the area of Stuttgart during winter and summer seasons. Stuttgart is situated in moderate mountainous terrain in southwestern Germany. We focus on the connection between atmos…
View article: Cross‐valley vortices in the Inn valley, Austria: Structure, evolution and governing force imbalances
Cross‐valley vortices in the Inn valley, Austria: Structure, evolution and governing force imbalances Open
Exchange of momentum and scalars in the mountain boundary layer is achieved through an interaction of meso‐to‐microscale motions, occurring to varying extents depending on the combined effect of thermally driven as well as dynamically driv…
View article: Comment on acp-2020-1306
Comment on acp-2020-1306 Open
During the West African summer monsoon, pollutants emitted in urbanized coastal areas modify cloud cover and precipitation patterns. The Dynamics-Aerosol-Chemistry-Cloud-Interactions in West Africa (DACCIWA) field campaign provided numerou…
View article: Sensitivity of convective precipitation to model grid spacing and land‐surface resolution in ICON
Sensitivity of convective precipitation to model grid spacing and land‐surface resolution in ICON Open
The impact of model grid spacing and land‐surface resolution (LSR) on convective precipitation are investigated for areas with different orographic complexities. ICOsahedral Nonhydrostatic (ICON) model simulations were performed for six da…
View article: Sensitivity of low-level clouds and precipitation to anthropogenic aerosol emission in southern West Africa: a DACCIWA case study
Sensitivity of low-level clouds and precipitation to anthropogenic aerosol emission in southern West Africa: a DACCIWA case study Open
During the West African summer monsoon, pollutants emitted in urbanized coastal areas modify cloud cover and precipitation patterns. The Dynamics-Aerosol-Chemistry-Cloud-Interactions in West Africa (DACCIWA) field campaign provided numerou…
View article: Breakup of nocturnal low-level stratiform clouds during the southern West African monsoon season
Breakup of nocturnal low-level stratiform clouds during the southern West African monsoon season Open
<p><span>During monsoon season in southern West Africa (SWA), nocturnal stratiform low-level clouds (LLSC) frequently form over a region extending from Guinean coast to several hundred kilometers inland. The cloud deck </spa…
View article: Breakup of nocturnal low-level stratiform clouds during the southern West African monsoon season
Breakup of nocturnal low-level stratiform clouds during the southern West African monsoon season Open
Within the framework of the DACCIWA (Dynamics–Aerosol–Chemistry–Cloud Interactions in West Africa) project and based on a field experiment conducted in June and July 2016, we analyze the daytime breakup of continental low-level stratiform …
View article: Mesoscale wind patterns over the complex urban terrain around Stuttgart investigated with dual-Doppler lidar profiles
Mesoscale wind patterns over the complex urban terrain around Stuttgart investigated with dual-Doppler lidar profiles Open
The flow in the atmospheric boundary layer (ABL) over cities is crucial for the urban climate as it controls the exchange of heat, moisture and pollutants within the ABL and with the surroundings. In particular for cities in mountainous te…
View article: CROSSINN: A Field Experiment to Study the Three-Dimensional Flow Structure in the Inn Valley, Austria
CROSSINN: A Field Experiment to Study the Three-Dimensional Flow Structure in the Inn Valley, Austria Open
While the exchange of mass, momentum, moisture, and energy over horizontally homogeneous, flat terrain is mostly driven by vertical turbulent mixing, thermally and dynamically driven mesoscale flows substantially contribute to the Earth–at…
View article: Key lessons from the DACCIWA project for operational meteorological services
Key lessons from the DACCIWA project for operational meteorological services Open
This document describes the conclusions of the EU-funded project Dynamics- Aerosol-Chemistry-Cloud Interactions in West Africa (DACCIWA) directly relevant to operational meteorological services. DACCIWA produced the most comprehensive obse…
View article: Detection of structures in the horizontal wind field over complex terrain using coplanar Doppler lidar scans
Detection of structures in the horizontal wind field over complex terrain using coplanar Doppler lidar scans Open
Coplanar scans from three Doppler lidars are used to retrieve the horizontal wind field in a horizontal plane of about 5 km × 5 km in size above the city of Stuttgart in south-western Germany. Stuttgart is located in moderate mountainous t…
View article: The vertical variability of black carbon observed in the atmospheric boundary layer during DACCIWA
The vertical variability of black carbon observed in the atmospheric boundary layer during DACCIWA Open
This study underlines the important role of the transported black carbon (BC) mass concentration in the West African monsoon (WAM) area. BC was measured with a micro-aethalometer integrated in the payload bay of the unmanned research aircr…
View article: Breakup of nocturnal low-level stratiform clouds during southern West African Monsoon Season
Breakup of nocturnal low-level stratiform clouds during southern West African Monsoon Season Open
Within the framework of the DACCIWA (Dynamics-Aerosol-Chemistry-Cloud-Interactions over West Africa) project, and based on a field experiment conducted in June and July 2016, we analyse the daytime breakup of the continental low-level stra…
View article: Observation of sensible and latent heat flux profiles with lidar
Observation of sensible and latent heat flux profiles with lidar Open
We present the first measurement of the sensible heat flux (H) profile in the convective boundary layer (CBL) derived from the covariance of collocated vertical-pointing temperature rotational Raman lidar and Doppler wind lidar measurement…
View article: Multi-scale transport and exchange processes in the atmosphere over mountains
Multi-scale transport and exchange processes in the atmosphere over mountains Open
TEAMx (www.teamx-programme.org) ist ein internationales Forschungsprogramm, das darauf abzielt, das Verständnis von Austauschprozessen in der Atmosphäre über Bergen auf mehreren Ebenen zu verbessern und die Parametrisierung dieser Prozesse…
View article: An LES-based airborne Doppler lidar simulator and its application to wind profiling in inhomogeneous flow conditions
An LES-based airborne Doppler lidar simulator and its application to wind profiling in inhomogeneous flow conditions Open
Wind profiling by Doppler lidar is common practice and highly useful in a wide range of applications. Airborne Doppler lidar can provide additional insights relative to ground-based systems by allowing for spatially distributed and targete…
View article: The diurnal stratocumulus-to-cumulus transition over land in southern West Africa
The diurnal stratocumulus-to-cumulus transition over land in southern West Africa Open
The misrepresentation of the diurnal cycle of boundary layer clouds by large-scale models strongly impacts the modeled regional energy balance in southern West Africa. In particular, recognizing the processes involved in the maintenance an…
View article: Conceptual model of diurnal cycle of low-level stratiform clouds over southern West Africa
Conceptual model of diurnal cycle of low-level stratiform clouds over southern West Africa Open
The DACCIWA (Dynamics Aerosol Chemistry Cloud Interactions in West Africa) project and the associated ground-based field experiment, which took place during summer 2016, provided a comprehensive dataset on the low-level stratiform clouds (…
View article: A New Airborne Doppler Lidar for Boundary Layer Research & LES-Based Simulation
A New Airborne Doppler Lidar for Boundary Layer Research & LES-Based Simulation Open
Airborne Doppler lidar measurements are a valuable tool in meteorological research. A new airborne Doppler lidar system has been developed jointly by the Karlsruhe Institute of Technology (KIT) and the Technical University of Brunswick. Th…
View article: The Added Value of Large-eddy and Storm-resolving Models for Simulating Clouds and Precipitation
The Added Value of Large-eddy and Storm-resolving Models for Simulating Clouds and Precipitation Open
More than one hundred days were simulated over very large domains with fine (0.156 km to 2.5 km) grid spacing for realistic conditions to test the hypothesis that storm (kilometer) and large-eddy (hectometer) resolving simulations would pr…