Daniel Kunkel

Turbulent mixing at the polar jet and transport of cirrus particles into the lowermost extratropical stratosphere

Nicolas Emig, Annette Miltenberger, Heiko Bozem, Martina Krämer et autres

Abstract. The composition of the extratropical transition layer (ExTL), in particular the mixing ratios of ozone and water vapour, has a high impact on the radiative budget of the atmosphere. The ExTL is a transition region above the extratropical tropopause, characterized by …

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Evidence of gravity wave contribution to vertical shear and mixing in the lower stratosphere

Madhuri Umbarkar, Daniel Kunkel, Annette Miltenberger, Hans‐Christoph Lachnitt et autres

Small-scale dynamics, particularly gravity waves (GWs), modify vertical wind shear and can trigger turbulence in the lowermost stratosphere (LMS), thereby influencing the transport of trace species across the tropopause. Although idealized modeling and observational case studies have demonstrated this link, the contribution …

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Aerosol from the Asian monsoon ubiquitous throughout the extratropical stratosphere

Franziska Köllner, Matthias Kohl, Fatih Ekinci, Oliver Eppers et autres

Asian summer monsoon (ASM) convection efficiently transports surface emissions into the upper troposphere, leading to the formation of the Asian tropopause aerosol layer (ATAL).The ATAL can affect Earth's climate directly by scattering solar radiation and indirectly by cloud formation.Little is known about …

Comment on egusphere-2026-413

Madhuri Umbarkar, Daniel Kunkel, Ulrich Achatz

Abstract. This study focuses on the spatial and temporal co-occurrence of gravity waves (GWs) and of vertical shear and turbulence in the extratropical lowermost stratosphere (LMS). For this, one year of ERA5 reanalysis data is used to analyse the occurrence and variability …

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Comment on egusphere-2026-413

Madhuri Umbarkar, Daniel Kunkel, Ulrich Achatz

Abstract. This study focuses on the spatial and temporal co-occurrence of gravity waves (GWs) and of vertical shear and turbulence in the extratropical lowermost stratosphere (LMS). For this, one year of ERA5 reanalysis data is used to analyse the occurrence and variability …

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A partial column perspective on ozone and water vapor in the lowermost stratosphere from satellite observations, reanalysis, and model data

Franziska Weyland, Peter Hoor, Daniel Kunkel, Felix Plöger et autres

Ozone and water vapor in the lowermost stratosphere (LMS) modify the Earth’s radiative budget, influence large-scale dynamics, and affect tropospheric air quality through exchange processes at the tropopause. Despite this importance, the variability and long-term trends of LMS ozone and, in particular, …

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The Impact of Non-Orographic Gravity Waves on Transport and Mixing: Effects of Oblique Propagation and Coupling to Turbulence

Tridib Banerjee, Young-Ha Kim, Georg Sebastian Voelker, Sebastian Borchert et autres

Gravity waves (GWs) are a fundamental driver of circulation, tracer transport, and mixing in the middle and upper atmosphere, but their treatment in global circulation models remains incomplete. In particular, standard parameterizations typically restrict propagation to the vertical and treat GW–turbulence interactions …

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Biomass burning in Australia: No evidence for carbonyl sulfide (OCS) enhancement in fire plumes from in-situ measurements during SouthTRAC

Stephan Kessler, Nicolas Emig, Hans‐Christoph Lachnitt, Daniel Kunkel et autres

Determining the atmospheric abundance and the emission sources of carbonyl sulfide (OCS) plays a crucial role for the sulfur budget in the atmosphere.In addition to its main anthropogenic and biogenic sources, biomass burning is assumed to be an essential, but not well …

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Empirical air mass budgets in the winter-spring lower stratosphere from in-situ measurements during ASCCI, SouthTRAC and POLSTRACC missions

Peter Hoor, Franziska Weyland, Vera Bense, Heiko Bozem et autres

The composition of the UTLS plays a critical role in shaping Earth’s radiation budget, large-scale dynamics, and not least surface weather and air quality. Yet, its high spatiotemporal variability - driven by diverse transport and mixing pathways on different time scales - …

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Separation of tropopause mixing from long-term stratospheric variability using in-situ measurements during PHILEAS and ASCCI

Jonas Blumenroth, Hans‐Christoph Lachnitt, Heiko Bozem, Franziska Weyland et autres

Mixing between the upper troposphere (UT) and the lower stratosphere (LS) occurs on short timescales compared to dynamic processes within the stratosphere. These mixing processes form the Extratropical Transition Layer (ExTL). Due to the nature of the tropopause as transport barrier, tracers …

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Co-occurrence of gravity waves, vertical wind shear and turbulence in the lowermost stratosphere over the North Atlantic

Madhuri Umbarkar, Daniel Kunkel, Ulrich Achatz

Abstract. This study focuses on the spatial and temporal co-occurrence of gravity waves (GWs) and of vertical shear and turbulence in the extratropical lowermost stratosphere (LMS). For this, one year of ERA5 reanalysis data is used to analyse the occurrence and variability …

de (code pays fourni par la source)

Aerosol from the Asian monsoon ubiquitous throughout the extratropical stratosphere

Franziska Köllner, Matthias Kohl, Fatih Ekinci, Oliver Eppers et autres

Asian summer monsoon (ASM) convection efficiently transports surface emissions into the upper troposphere, leading to the formation of the Asian tropopause aerosol layer (ATAL). The ATAL can affect Earth’s climate directly by scattering solar radiation and indirectly by cloud formation. Little is …

de (code pays fourni par la source)