U. Schumann
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View article: On the Weather Impact of Contrails: New Insights from Coupled ICON–CoCiP Simulations
On the Weather Impact of Contrails: New Insights from Coupled ICON–CoCiP Simulations Open
Contrail forecasts typically neglect feedbacks with the atmosphere. Here, we couple the Contrail Cirrus Prediction model (CoCiP) with the global Icosahedral Non-hydrostatic (ICON) numerical weather model in a two-way mode accounting for co…
View article: On the Weather Impact of Contrails: New Insights from Coupled ICON–CoCiP Simulations
On the Weather Impact of Contrails: New Insights from Coupled ICON–CoCiP Simulations Open
Contrail forecasts typically neglect feedbacks with the atmosphere. Here, we investigate the contrail-weather interaction using a two-way coupling of the Contrail Cirrus Prediction model (CoCiP) with the global non-hydrostatic numerical we…
View article: Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest-generation jet engines and 100 % sustainable aviation fuel
Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest-generation jet engines and 100 % sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) in-flight measurements were ca…
View article: Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise
Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise Open
In order to reduce aviation's CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥70 % SAF by 2050. In addition to a reduction of l…
View article: A simple model for the estimation of turbofan engine performance in all airborne phases of flight
A simple model for the estimation of turbofan engine performance in all airborne phases of flight Open
The overall efficiency of a turbofan engine may be expressed as a function of the Mach number, flight level and one other parameter. This may be either the net thrust, the turbine entry temperature or the fuel flow rate. Using basic aero-t…
View article: The effect of uncertainty in humidity and model parameters on the prediction of contrail energy forcing
The effect of uncertainty in humidity and model parameters on the prediction of contrail energy forcing Open
Previous work has shown that while the net effect of aircraft condensation trails (contrails) on the climate is warming, the exact magnitude of the energy forcing per meter of contrail remains uncertain. In this paper, we explore the skill…
View article: Global aviation contrail climate effects from 2019 to 2021
Global aviation contrail climate effects from 2019 to 2021 Open
The current best-estimate of the global annual mean radiative forcing (RF) attributable to contrail cirrus is thought to be 3 times larger than the RF from aviation's cumulative CO2 emissions. Here, we simulate the global contrail RF for 2…
View article: Comment on egusphere-2024-1224
Comment on egusphere-2024-1224 Open
Abstract. In order to reduce aviation’s CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥ 70 % SAF by 2050. In addition to a red…
View article: Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise
Measurements of particle emissions of an A350-941 burning 100 % sustainable aviation fuels in cruise Open
In order to reduce aviation’s CO2 emissions and comply with current climate targets, the European Union plans a mandatory quota of 2 % sustainable aviation fuel (SAF) by 2025, rising up to ≥ 70 % SAF by 2050. In addition to a reduction of …
View article: Comment on egusphere-2024-454
Comment on egusphere-2024-454 Open
Abstract. Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were ca…
View article: Comment on egusphere-2024-454
Comment on egusphere-2024-454 Open
Abstract. Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were ca…
View article: Powering aircraft with 100 % sustainable aviation fuel reduces ice crystals in contrails
Powering aircraft with 100 % sustainable aviation fuel reduces ice crystals in contrails Open
Powering aircraft by sustainable aviation fuels (SAFs) is a pathway to reduce the climate impact of aviation by lowering aviation lifecycle CO2 emissions and by reducing ice crystal numbers and radiative forcing from contrails. While the e…
View article: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel
In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were carried out …
View article: Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel
Measurement report: In-flight and ground-based measurements of nitrogen oxide emissions from latest generation jet engines and 100% sustainable aviation fuel Open
Nitrogen oxides, emitted from air traffic, are of concern due to their impact on climate by changing atmospheric ozone and methane levels. Using the DLR research aircraft Falcon, total reactive nitrogen (NOy) measurements were carried out …
View article: On the conditions for absolute minimum fuel burn for turbofan powered, civil transport aircraft and a simple model for wave drag
On the conditions for absolute minimum fuel burn for turbofan powered, civil transport aircraft and a simple model for wave drag Open
In a recent series of papers, Poll and Schumann have been developing a simple model for estimating fuel burn for turbofan powered, civil transport aircraft for a given mass, Mach number and flight level and in a specified ambient temperatu…
View article: Comment on egusphere-2023-1859
Comment on egusphere-2023-1859 Open
Abstract. The global annual mean radiative forcing (RF) attributable to contrail cirrus is comparable to the RF from aviation’s cumulative CO2 emissions. Here, we simulate the global contrail climate forcing for 2019–2021 using reanalysis …
View article: Powering aircraft with 100% sustainable aviation fuel reduces ice crystals in contrails
Powering aircraft with 100% sustainable aviation fuel reduces ice crystals in contrails Open
Powering aircraft by sustainable aviation fuels (SAF) is a pathway to reduce the climate impact of aviation by lowering aviation life-cycle CO2 emissions and by reducing ice crystal numbers and radiative forcing from contrails. While the e…
View article: Comment on egusphere-2023-1859
Comment on egusphere-2023-1859 Open
Abstract. The global annual mean radiative forcing (RF) attributable to contrail cirrus is comparable to the RF from aviation’s cumulative CO2 emissions. Here, we simulate the global contrail climate forcing for 2019–2021 using reanalysis …
View article: Comment on egusphere-2023-1859
Comment on egusphere-2023-1859 Open
Abstract. The global annual mean radiative forcing (RF) attributable to contrail cirrus is comparable to the RF from aviation’s cumulative CO2 emissions. Here, we simulate the global contrail climate forcing for 2019–2021 using reanalysis …
View article: Comment on egusphere-2023-1859
Comment on egusphere-2023-1859 Open
Abstract. The global annual mean radiative forcing (RF) attributable to contrail cirrus is comparable to the RF from aviation’s cumulative CO2 emissions. Here, we simulate the global contrail climate forcing for 2019–2021 using reanalysis …
View article: Global aviation contrail climate effects from 2019 to 2021
Global aviation contrail climate effects from 2019 to 2021 Open
The global annual mean radiative forcing (RF) attributable to contrail cirrus is comparable to the RF from aviation’s cumulative CO2 emissions. Here, we simulate the global contrail climate forcing for 2019–2021 using reanalysis weather da…
View article: Non‐Orographic Gravity Waves and Turbulence Caused by Merging Jet Streams
Non‐Orographic Gravity Waves and Turbulence Caused by Merging Jet Streams Open
Jet streams are important sources of non‐orographic internal gravity waves and clear air turbulence (CAT). We analyze non‐orographic gravity waves and CAT during a merger of the polar front jet stream (PFJ) with the subtropical jet stream …
View article: Upper-tropospheric slightly ice-subsaturated regions: frequency of occurrence and statistical evidence for the appearance of contrail cirrus
Upper-tropospheric slightly ice-subsaturated regions: frequency of occurrence and statistical evidence for the appearance of contrail cirrus Open
Microphysical, optical, and environmental properties of contrail cirrus and natural cirrus were investigated by applying a new, statistically based contrail–cirrus separation method to 14.7 h of cirrus cloud measurements (sampling frequenc…
View article: Targeted Use of Sustainable Aviation Fuel to Maximize Climate Benefits
Targeted Use of Sustainable Aviation Fuel to Maximize Climate Benefits Open
Sustainable aviation fuel (SAF) can reduce aviation's CO2 and non-CO2 impacts. We quantify the change in contrail properties and climate forcing in the North Atlantic resulting from different blending ratios of SAF and demonstrate that int…
View article: Non-orographic gravity waves and turbulence caused by merging jet streams
Non-orographic gravity waves and turbulence caused by merging jet streams Open
Jet streams are important sources of non-orographic internal gravity waves and clear air turbulence (CAT). We analyze non-orographic gravity waves and CAT during a merging of the polar front jet stream (PFJ) with the subtropical jet stream…
View article: Upper tropospheric slightly ice-subsaturated regions: Frequency of occurrence and statistical evidence for the appearance of contrail cirrus
Upper tropospheric slightly ice-subsaturated regions: Frequency of occurrence and statistical evidence for the appearance of contrail cirrus Open
Microphysical, optical, and environmental properties of contrail cirrus and natural cirrus were investigated by applying a new, statistically based contrail–cirrus separation method to 14.7 hours of cirrus cloud measurements during the air…
View article: Aviation contrail climate effects in the North Atlantic from 2016 to 2021
Aviation contrail climate effects in the North Atlantic from 2016 to 2021 Open
Around 5 % of anthropogenic radiative forcing (RF) is attributed to aviation CO2 and non-CO2 impacts. This paper quantifies aviation emissions and contrail climate forcing in the North Atlantic, one of the world's busiest air traffic corri…