Thomas Reddmann
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Atmospheric lifetime of sulphur hexafluoride (SF <sub>6</sub> ) and five other trace gases in the BASCOE model driven by three reanalyses Open
In this work, sulphur hexafluoride (SF6), which is often used as a tracer for stratospheric transport due to its inertness in the stratosphere and nearly linear growth rate in the troposphere, is included in the chemistry transport model (…
View article: Thermospheric nitric oxide is modulated by the ratio of atomic to molecular oxygen and thermospheric dynamics during solar minimum
Thermospheric nitric oxide is modulated by the ratio of atomic to molecular oxygen and thermospheric dynamics during solar minimum Open
The formation of nitric oxide (NO) by geomagnetic activity and EUV photoionization in the upper mesosphere and lower thermosphere, and its subsequent impact on ozone, contributes to the natural forcing of the climate system, and has been r…
View article: Implementation of solar UV and energetic particle precipitation within the LINOZ scheme in ICON-ART
Implementation of solar UV and energetic particle precipitation within the LINOZ scheme in ICON-ART Open
We extended the Linearized ozone scheme – LINOZ in the ICON (ICOsahedral Nonhydrostatic) – ART (the extension for Aerosols and Reactive Trace gases) model system to include NOy formed by auroral and medium-energy electrons in the upper mes…
View article: The Atmospheric Composition Component of the ICON modeling framework: ICON-ART version 2025.04
The Atmospheric Composition Component of the ICON modeling framework: ICON-ART version 2025.04 Open
Accurate and efficient modeling of atmospheric composition, including aerosols and trace gases and their interactions with radiation, clouds, and dynamics is essential for improving predictions of air quality, weather, climate, and related…
View article: Atmospheric lifetime of sulfur hexafluoride (SF <sub>6</sub> ) and five other trace gases in the BASCOE model driven by three reanalyses
Atmospheric lifetime of sulfur hexafluoride (SF <sub>6</sub> ) and five other trace gases in the BASCOE model driven by three reanalyses Open
In this work, sulfur hexafluoride (SF6), which is often used as a tracer for stratospheric transport due to its inertness in the stratosphere and nearly linear growth rate in the troposphere, is included in the chemistry transport model (C…
View article: Implementation of solar UV and energetic particle precipitation within the LINOZ scheme in ICON-ART
Implementation of solar UV and energetic particle precipitation within the LINOZ scheme in ICON-ART Open
We extended the Linearized ozone scheme –LINOZ in the ICON (ICOsahedral Nonhydrostatic) –ART (the extension for Aerosols and Reactive Trace gases) model system to include NOy formed by auroral and medium-energy electrons in the upper mesos…
View article: Thermospheric nitric oxide NO during solar minimum modulated by O/O <sub>2</sub> ratio and thermospheric transport and mixing
Thermospheric nitric oxide NO during solar minimum modulated by O/O <sub>2</sub> ratio and thermospheric transport and mixing Open
The formation of NO by geomagnetic activity and EUV photoionization in the upper mesosphere and lower thermosphere and its subsequent impact on ozone contributes to the natural forcing of the climate system, and is recommended to be includ…
View article: Impact of chlorine ion chemistry on ozone loss in the middle atmosphere during very large solar proton events
Impact of chlorine ion chemistry on ozone loss in the middle atmosphere during very large solar proton events Open
Solar coronal mass ejections can accelerate charged particles, mostly protons, to high energies, causing solar proton events (SPEs). Such energetic particles can precipitate upon the Earth's atmosphere, mostly in polar regions because of g…
The impact of an extreme solar event on the middle atmosphere: a case study Open
A possible impact of an extreme solar particle event (ESPE) on the middle atmosphere is studied for present-day climate and geomagnetic conditions. We consider an ESPE with an occurrence probability of about 1 per millennium. In addition, …
Reply on RC2 Open
Abstract. A possible impact of an extreme solar particle event (ESPE) on the middle atmosphere is studied for the present-day climate and geomagnetic conditions. We consider an ESPE with an occurrence probability of about 1 per millenium c…
Reply on RC1 Open
Abstract. A possible impact of an extreme solar particle event (ESPE) on the middle atmosphere is studied for the present-day climate and geomagnetic conditions. We consider an ESPE with an occurrence probability of about 1 per millenium c…
View article: Impact of chlorine ion chemistry on ozone loss in the middle atmosphere during very large solar proton events
Impact of chlorine ion chemistry on ozone loss in the middle atmosphere during very large solar proton events Open
Solar coronal mass ejections can accelerate charged particles, mostly protons, to high energies, causing Solar Particle Events (SPEs). Such energetic particles can precipitate upon the Earth’s atmosphere, mostly in polar regions because of…
View article: The impact of extreme solar events on the atmosphere
The impact of extreme solar events on the atmosphere Open
Besides the well-known 11 year solar cycle, the Sun occasionally produces strong eruptions on the Sun‘s surface and in the corona. They can first be seen as flare events in electromagnetic spectrum down to X ray wavelengths. Within these s…
Comment on acp-2023-31 Open
Abstract. A possible impact of an extreme solar particle event (ESPE) on the middle atmosphere is studied for the present-day climate and geomagnetic conditions. We consider an ESPE with an occurrence probability of about 1 per millenium c…
The Impact of a Solar Extreme Event on the Middle Atmosphere, a Case Study Open
A possible impact of an extreme solar particle event (ESPE) on the middle atmosphere is studied for the present-day climate and geomagnetic conditions. We consider an ESPE with an occurrence probability of about 1 per millenium combined wi…
The impact of sulfur hexafluoride (SF <sub>6</sub> ) sinks on age of air climatologies and trends Open
Mean age of air (AoA) is a common diagnostic for the strength of the stratospheric overturning circulation in both climate models and observations. AoA climatologies and AoA trends over the recent decades of model simulations and proxies d…
Heppa III Intercomparison Experiment on Electron Precipitation Impacts: 2. Model‐Measurement Intercomparison of Nitric Oxide (NO) During a Geomagnetic Storm in April 2010 Open
Precipitating auroral and radiation belt electrons are considered to play an important part in the natural forcing of the middle atmosphere with a possible impact on the climate system. Recent studies suggest that this forcing is underesti…
HEPPA III Intercomparison Experiment on Electron Precipitation Impacts: 1. Estimated Ionization Rates During a Geomagnetic Active Period in April 2010 Open
Precipitating auroral and radiation belt electrons are considered an important part of the natural forcing of the climate system. Recent studies suggest that this forcing is underestimated in current chemistry‐climate models. The High Ener…
The impact of SF <sub>6</sub> sinks on age of air climatologies and trends Open
Mean age of air (AoA) is a common diagnostic for the strength of the stratospheric overturning circulation in both climate models and observations. AoA climatologies and its trends over the recent decades of model simulations and proxies d…
HEPPA III intercomparison experiment on electron precipitation impacts:  Estimated ionization rates during a geomagnetic active period in April 2010 Open
Precipitating auroral and radiation belt electrons are considered an important part of the natural forcing of the climate system. Recent studies suggest that this forcing is underestimated in current chemistry-climate models. The HEPPA III…
Quantifying uncertainties of climate signals in chemistry climate models related to the 11-year solar cycle – Part 1: Annual mean response in heating rates, temperature, and ozone Open
Variations in the solar spectral irradiance (SSI) with the 11-year sunspot cycle have been shown to have a significant impact on temperatures and the mixing ratios of atmospheric constituents in the stratosphere and mesosphere. Uncertainti…
Reconciling modelled and observed age of air through SF6 sinks Open
Mean age of air (AoA) is a common diagnostic for the stratospheric overturning circulation in both climate models and observations. Observations of AoA mostly base on measurements of SF6, which is an almost ideal AoA tracer because its ems…
Quantifying uncertainties of climate signals related to the 11–year solar cycle. Part I: Annual mean response in heating rates,temperature and ozone Open
Variations of the solar spectral irradiance (SSI) with the 11-year sunspot cycle have been shown to have a significant impact on temperatures and the mixing ratios of atmospheric constituents in the stratosphere and mesosphere. Uncertainti…
Quantifying uncertainties of climate signals in chemistry climate models related to the 11-year solar cycle – Part 1: Annual mean response in heating rates, temperature, and ozone Open
Variations in the solar spectral irradiance (SSI) with the 11-year sunspot cycle have been shown to have a significant impact on temperatures and the mixing ratios of atmospheric constituents in the stratosphere and mesosphere. Uncertainti…
NO <sub> <i>y</i> </sub> production, ozone loss and changes in net radiative heating due to energetic particle precipitation in 2002–2010 Open
We analyze the impact of energetic particle precipitation on the stratospheric nitrogen budget, ozone abundances and net radiative heating using results from three global chemistry-climate models considering solar protons and geomagnetic f…
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