Lars Hoffmann
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View article: Harmonisation of sixteen tropospheric ozone satellite data records
Harmonisation of sixteen tropospheric ozone satellite data records Open
The first Tropospheric Ozone Assessment Report (TOAR, 2014–2019) encountered several observational challenges that limited the confidence in estimates of the burden, short-term variability, and long-term changes of ozone in the free tropos…
View article: Compression of ERA5 meteorological reanalysis data and their application to simulations with the Lagrangian model for Massive Parallel Trajectory Calculations (MPTRAC v2.7)
Compression of ERA5 meteorological reanalysis data and their application to simulations with the Lagrangian model for Massive Parallel Trajectory Calculations (MPTRAC v2.7) Open
Computer performance has increased immensely in recent years, but the ability to store data has only increased slightly. The storage requirements for the current version of the ERA5 meteorological reanalysis data provided by the European C…
View article: A Convolutional Neural Network for the Detection of Gravity Waves in Satellite Observations and Numerical Simulations
A Convolutional Neural Network for the Detection of Gravity Waves in Satellite Observations and Numerical Simulations Open
Comparisons between observed and model‐resolved gravity waves (GWs) are crucial for evaluating general circulation model (GCM) simulation accuracy and understanding wave characteristics. However, observational noise often obscures waves, c…
View article: Mechanisms Linking Stratospheric Gravity Wave Activity to Hurricane Intensification: Insights From Model Simulation of Hurricane Joaquin
Mechanisms Linking Stratospheric Gravity Wave Activity to Hurricane Intensification: Insights From Model Simulation of Hurricane Joaquin Open
Previous studies based on satellite observations and model simulations have revealed a significant correlation between intense stratospheric gravity wave (GW) activity and hurricane intensification. This research further investigated the u…
View article: Technical note: A comparative study of chemistry schemes for volcanic sulfur dioxide in Lagrangian transport simulations – a case study of the 2019 Raikoke eruption
Technical note: A comparative study of chemistry schemes for volcanic sulfur dioxide in Lagrangian transport simulations – a case study of the 2019 Raikoke eruption Open
Lagrangian transport models are important tools to study the sources, spread, and lifetime of air pollutants. In order to simulate the transport of reactive atmospheric pollutants, the implementation of efficient chemistry and mixing schem…
View article: Stratospheric Gravity waves in AIRS observations and high-resolution models
Stratospheric Gravity waves in AIRS observations and high-resolution models Open
Atmospheric gravity waves vary hugely in scale; with horizontal wavelengths ranging from a few to thousands of km. Typically, gravity waves are smaller than model grid-size and as a result, their effects are parametrised instead of being e…
View article: Coincident/Simultaneous Observations of Stratospheric Concentric Gravity Waves and Concentric Traveling Ionospheric Disturbances Over the Continental U.S. in 2022
Coincident/Simultaneous Observations of Stratospheric Concentric Gravity Waves and Concentric Traveling Ionospheric Disturbances Over the Continental U.S. in 2022 Open
This study examines the seasonal distributions of simultaneous stratospheric concentric gravity waves (GWs) observed by the Atmospheric Infrared Sounders and concentric traveling ionospheric disturbances (TIDs) detected by the ground‐based…
View article: A Novel Identification Method for Stratospheric Gravity Waves in Nadir Viewing Satellite Observations
A Novel Identification Method for Stratospheric Gravity Waves in Nadir Viewing Satellite Observations Open
Atmospheric gravity waves (GWs) are an important mechanism for vertical transport of energy and momentum through the atmosphere. Their impacts are apparent at all scales including aviation, weather, and climate. Identifying stratospheric G…
View article: Harmonisation of sixteen tropospheric ozone satellite data records
Harmonisation of sixteen tropospheric ozone satellite data records Open
The first Tropospheric Ozone Assessment Report (TOAR, 2014–2019) encountered several observational challenges that limited the confidence in estimates of the burden, short-term variability, and long-term changes of ozone in the free tropos…
View article: Exploring Sources of Gravity Waves in the Southern Winter Stratosphere Using 3‐D Satellite Observations and Backward Ray‐Tracing
Exploring Sources of Gravity Waves in the Southern Winter Stratosphere Using 3‐D Satellite Observations and Backward Ray‐Tracing Open
During austral winter, the southern high latitudes has some of the most intense stratospheric gravity wave (GW) activity globally. However, producing accurate representations of GW dynamics in this region in numerical models has proved exc…
View article: Impact of mountain-wave-induced temperature fluctuations on the occurrence of polar stratospheric ice clouds: a statistical analysis based on MIPAS observations and ERA5 data
Impact of mountain-wave-induced temperature fluctuations on the occurrence of polar stratospheric ice clouds: a statistical analysis based on MIPAS observations and ERA5 data Open
Temperature fluctuations induced by mountain waves can play a crucial role in the formation of polar stratospheric clouds (PSCs). In particular, the cold phase of the waves can lower local temperatures sufficiently to trigger PSC formation…
View article: Technical note: A comparative study of chemistry schemes for volcanic sulfur dioxide in Lagrangian transport simulations: a case study of the 2019 Raikoke eruption
Technical note: A comparative study of chemistry schemes for volcanic sulfur dioxide in Lagrangian transport simulations: a case study of the 2019 Raikoke eruption Open
Lagrangian transport models are important tools to study the sources, spread, and life time of air pollutants. In order to simulate the transport of reactive atmospheric pollutants, the implementation of efficient chemistry and mixing sche…
View article: Lagrangian transport based on the winds of the icosahedral nonhydrostatic model (ICON)
Lagrangian transport based on the winds of the icosahedral nonhydrostatic model (ICON) Open
Representing atmospheric transport of constituents accurately in a chemistry climate model is a challenge. This is true in particular for a realistic representation of atmospheric transport barriers, e.g. at the edge of the polar vortices …
View article: Comparing Gravity Waves in a Kilometer‐Scale Run of the IFS to AIRS Satellite Observations and ERA5
Comparing Gravity Waves in a Kilometer‐Scale Run of the IFS to AIRS Satellite Observations and ERA5 Open
Atmospheric gravity waves (GWs) impact the circulation and variability of the atmosphere. Sub‐grid scale GWs, which are too small to be resolved, are parameterized in weather and climate models. However, some models are now available at re…
View article: Implementation and evaluation of diabatic advection in the Lagrangian transport model MPTRAC 2.6
Implementation and evaluation of diabatic advection in the Lagrangian transport model MPTRAC 2.6 Open
Diabatic transport schemes with hybrid zeta coordinates, which follow isentropes in the stratosphere, are known to greatly improve Lagrangian transport calculations compared to the kinematic approach. However, some Lagrangian transport cal…
View article: Accelerating Lagrangian transport simulations on graphics processing units: performance optimizations of Massive-Parallel Trajectory Calculations (MPTRAC) v2.6
Accelerating Lagrangian transport simulations on graphics processing units: performance optimizations of Massive-Parallel Trajectory Calculations (MPTRAC) v2.6 Open
Lagrangian particle dispersion models are indispensable tools for the study of atmospheric transport processes. However, Lagrangian transport simulations can become numerically expensive when large numbers of air parcels are involved. To a…
View article: Comment on egusphere-2024-547
Comment on egusphere-2024-547 Open
Abstract. Small-scale temperature fluctuations can play a crucial role in the occurrence of ice clouds. This study analyzes a decade of ice polar stratospheric clouds (PSCs) occurrence obtained from Michelson Interferometer for Passive Atm…
View article: Comment on egusphere-2024-547
Comment on egusphere-2024-547 Open
Abstract. Small-scale temperature fluctuations can play a crucial role in the occurrence of ice clouds. This study analyzes a decade of ice polar stratospheric clouds (PSCs) occurrence obtained from Michelson Interferometer for Passive Atm…
View article: Comment on egusphere-2024-547
Comment on egusphere-2024-547 Open
Abstract. Small-scale temperature fluctuations can play a crucial role in the occurrence of ice clouds. This study analyzes a decade of ice polar stratospheric clouds (PSCs) occurrence obtained from Michelson Interferometer for Passive Atm…
View article: Exploring sources of gravity waves in the southern winter stratosphere through ray-tracing 3-D satellite observations
Exploring sources of gravity waves in the southern winter stratosphere through ray-tracing 3-D satellite observations Open
During winter, the latitude belt at 60S is one of the most intense hotspots of stratospheric gravity wave (GW) activity. However, producing accurate representations of GW dynamics in this region in numerical models has proved exceptionally…
View article: Recreating Observed Convection‐Generated Gravity Waves From Weather Radar Observations via a Neural Network and a Dynamical Atmospheric Model
Recreating Observed Convection‐Generated Gravity Waves From Weather Radar Observations via a Neural Network and a Dynamical Atmospheric Model Open
Convection‐generated gravity waves (CGWs) transport momentum and energy, and this momentum is a dominant driver of global features of Earth's atmosphere's general circulation (e.g., the quasi‐biennial oscillation, the pole‐to‐pole mesosphe…
View article: Tracking Carbon Dioxide with Lagrangian Transport Simulations: Case Study of Canadian Forest Fires in May 2021
Tracking Carbon Dioxide with Lagrangian Transport Simulations: Case Study of Canadian Forest Fires in May 2021 Open
The large amounts of greenhouse gases, such as carbon dioxide, produced by severe forest fires not only seriously affect the ecosystems in the area where the fires occur but also cause a greenhouse effect that has a profound impact on the …
View article: A statistical analysis of the occurrence of polar stratospheric ice clouds based on MIPAS satellite observations and the ERA5 reanalysis
A statistical analysis of the occurrence of polar stratospheric ice clouds based on MIPAS satellite observations and the ERA5 reanalysis Open
Small-scale temperature fluctuations can play a crucial role in the occurrence of ice clouds. This study analyzes a decade of ice polar stratospheric clouds (PSCs) occurrence obtained from Michelson Interferometer for Passive Atmospheric S…
View article: Long-term changes in gravity wave activity in the middle atmosphere from satellite and ground-based observations
Long-term changes in gravity wave activity in the middle atmosphere from satellite and ground-based observations Open
Atmospheric gravity waves (GWs) are one of the most important drivers of the circulation of the middle and upper atmosphere. Usually generated in the lower atmosphere and propagating upwards through the atmospheric layers, the aggregated f…
View article: How realistic are resolved gravity waves in ERA5 reanalysis compared to satellite observations?
How realistic are resolved gravity waves in ERA5 reanalysis compared to satellite observations? Open
Modern numerical modelling simulations of the Earth's atmosphere have developed over the recent decades to ever finer spatial resolutions, allowing for a greater portion the atmospheric gravity wave (GW) spectrum to be resolved. Specialise…
View article: Compression of meteorological reanalysis data files and their application to Lagrangian transport simulations 
Compression of meteorological reanalysis data files and their application to Lagrangian transport simulations  Open
Computer performance has increased immensely in recent years, but the ability to store data has hardly increased at all. The current version of meteorological reanalysis data ERA5 provided by the European Centre of Medium-Range Weather For…