U. Platt
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View article: VOLCANO <sub>3</sub> – A Miniaturized Chemiluminescence Ozone Monitor for Drone-Based Measurements in Volcanic Plumes
VOLCANO <sub>3</sub> – A Miniaturized Chemiluminescence Ozone Monitor for Drone-Based Measurements in Volcanic Plumes Open
High levels of bromine monoxide (BrO) observed in volcanic plumes indicate significant catalytic destruction of tropospheric ozone (O3) at local to regional scales. The underlying chemical mechanisms are still poorly understood and the qua…
View article: Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations
Assessment of laboratory O<sub>4</sub> (O<sub>2</sub>–O<sub>2</sub> collision-induced) absorption cross-sections at 360 nm using atmospheric long-path DOAS observations Open
Absorption of light in the atmosphere by collision-induced absorption (CIA) by two oxygen molecules O2–O2, in the following referred to as O4, can be used to derive properties of aerosols and clouds from remote sensing observations. In rec…
View article: Identification of high emitting heavy duty vehicles using Plume Chasing: European case study for enforcement
Identification of high emitting heavy duty vehicles using Plume Chasing: European case study for enforcement Open
The real-world emissions of almost 5000 heavy-duty vehicles (HDVs), determined by the Plume Chasing method in different European countries from 2016 to 2023, are presented. NOx emission factors are provided for all assessed vehicles, while…
View article: First retrievals of aerosol microphysical properties from polarisation-sensitive MAX-DOAS measurements
First retrievals of aerosol microphysical properties from polarisation-sensitive MAX-DOAS measurements Open
Characterizing the microphysical properties of aerosols is crucial for understanding their impacts on air quality, climate change, and human health. In this study, we present a novel approach for determining aerosol size distribution, refr…
View article: Long-path DOAS observations of halogen oxides at Utqiagvik, Alaska
Long-path DOAS observations of halogen oxides at Utqiagvik, Alaska Open
Halogen chemistry is a central element of tropospheric ozone depletion events (ODEs) during polar spring. Key processes such as source mechanisms that produce reactive halogen species, their transport, and interhalogen interactions as well…
View article: Trends of stratospheric BrO (1995 to 2025) derived from ground-based DOAS observations at Kiruna, Northern Sweden
Trends of stratospheric BrO (1995 to 2025) derived from ground-based DOAS observations at Kiruna, Northern Sweden Open
Stratospheric bromine originates partly from natural and partly from anthropogenic sources. After the Montreal protocol and following amendments, anthropogenic emissions (halons and methyl bromide) were largely reduced. This reduction was …
View article: Assessment of laboratory O <sub>4</sub> absorption cross-sections at 360 nm using atmospheric long-path DOAS observations
Assessment of laboratory O <sub>4</sub> absorption cross-sections at 360 nm using atmospheric long-path DOAS observations Open
The atmospheric absorption of the oxygen collision complex O2-O2, in the following referred to as O4, can be used to derive properties of aerosols and clouds from remote sensing observations. In recent years, inconsistencies between the me…
View article: Reliable Ozone Measurements in Volcanic Plumes: A Way to Resolve the Volcanic Ozone Enigma
Reliable Ozone Measurements in Volcanic Plumes: A Way to Resolve the Volcanic Ozone Enigma Open
In addition to CO2 and sulphur dioxide (SO2), volcanic plumes also contain reactive halogen species. Bromine monoxide (BrO) can reliably be quantified by remote sensing measurements and is known to catalyse ozone (O3) destruction. Therefor…
View article: Long-term observations of halogen oxides in the Arctic: project overview and first results
Long-term observations of halogen oxides in the Arctic: project overview and first results Open
Halogen chemistry is a central element of tropospheric ozone depletion events (ODEs) during polar spring. However, key processes such as source mechanisms of reactive halogen species, their transport, and interhalogen interactions are stil…
View article: A new accurate retrieval algorithm of bromine monoxide columns inside minor volcanic plumes from Sentinel-5P TROPOMI observations
A new accurate retrieval algorithm of bromine monoxide columns inside minor volcanic plumes from Sentinel-5P TROPOMI observations Open
Bromine monoxide (BrO) is a key radical in the atmosphere, influencing the chemical state of the atmosphere, most notably the abundance of ozone (O3). O3 depletion caused by the release of bromine has been observed and modeled in polar reg…
View article: A new accurate retrieval of bromine monoxide inside minor volcanic plumes from Sentinel-5 Precursor/TROPOMI
A new accurate retrieval of bromine monoxide inside minor volcanic plumes from Sentinel-5 Precursor/TROPOMI Open
Bromine monoxide (BrO) is a key radical in the atmosphere, influencing the chemical state of the atmosphere, most notably the abundance of ozone. The main effect of BrO onto tropospheric ozone concentrations occurs in bromine release event…
View article: Quantifying BrO and SO2 distributions in volcanic plumes—Recent advances in imaging Fabry-Pérot interferometer correlation spectroscopy
Quantifying BrO and SO2 distributions in volcanic plumes—Recent advances in imaging Fabry-Pérot interferometer correlation spectroscopy Open
Bromine monoxide (BrO) and sulphur dioxide (SO 2 ) are two gases frequently observed in volcanic plumes by spectroscopic techniques capable of continuous gas monitoring like, e.g., Differential Optical Absorption Spectroscopy (DOAS). The s…
View article: New methods for the calibration of optical resonators: integrated calibration by means of optical modulation (ICOM) and narrow-band cavity ring-down (NB-CRD)
New methods for the calibration of optical resonators: integrated calibration by means of optical modulation (ICOM) and narrow-band cavity ring-down (NB-CRD) Open
Optical resonators are used in spectroscopic measurements of atmospheric trace gases to establish long optical path lengths L with enhanced absorption in compact instruments. In cavity-enhanced broad-band methods, the exact knowledge of bo…
View article: Source mechanisms and transport patterns of tropospheric bromine monoxide: findings from long-term multi-axis differential optical absorption spectroscopy measurements at two Antarctic stations
Source mechanisms and transport patterns of tropospheric bromine monoxide: findings from long-term multi-axis differential optical absorption spectroscopy measurements at two Antarctic stations Open
The presence of reactive bromine in polar regions is a widespread phenomenon that plays an important role in the photochemistry of the Arctic and Antarctic lower troposphere, including the destruction of ozone, the disturbance of radical c…
View article: High-spectral-resolution Fabry-Pérot interferometers overcome fundamental limitations of present volcanic gas remote sensing techniques
High-spectral-resolution Fabry-Pérot interferometers overcome fundamental limitations of present volcanic gas remote sensing techniques Open
Remote sensing (RS) of volcanic gases has become a central tool for studying volcanic activity. For instance, ultraviolet (UV) skylight spectroscopy with grating spectrographs (GS) enables SO 2 (and, under favourable conditions, BrO) quant…
View article: Tropospheric BrO in Arctic Spring 2019 measured by S5-P/TROPOMI - A statistical analysis of the spatial expansion and shape of tropospheric BrO plumes
Tropospheric BrO in Arctic Spring 2019 measured by S5-P/TROPOMI - A statistical analysis of the spatial expansion and shape of tropospheric BrO plumes Open
Halogen radicals can drastically alter the atmospheric chemistry. In the polar regions, this is made evident by the ozone depletion in the stratosphere (ozone hole) but also by destruction of boundary layer ozone during polar springs. Thes…
View article: Bromine monoxide composition in volcanic plumes measured by S-5P/TROPOMI – Global survey of magmatic composition
Bromine monoxide composition in volcanic plumes measured by S-5P/TROPOMI – Global survey of magmatic composition Open
Bromine monoxide (BrO) is a halogen radical influencing atmospheric chemical processes, in particular the abundance of ozone, e. g. in the polar boundary layer and above salt lakes, in the stratosphere as well as in volcanic plumes. Furthe…
View article: Towards better air quality using the plume chasing method: validation studies of real driving NOx emission measurements of vehicles
Towards better air quality using the plume chasing method: validation studies of real driving NOx emission measurements of vehicles Open
The reliability of Plume Chasing as a Remote Emission Measurement Technique in detecting NOx emissions is investigated. It allows, for example, to identify high-NOx-emitting vehicles with high precision. During a 5-day study of the CARES p…
View article: Comment on egusphere-2022-1074
Comment on egusphere-2022-1074 Open
Abstract. The presence of reactive bromine in Polar Regions is a widespread phenomenon that plays an important role in the photochemistry of the Arctic and Antarctic lower troposphere, including the destruction of ozone, the disturbance of…
View article: Comment on amt-2022-274
Comment on amt-2022-274 Open
Abstract. Optical resonators are used in spectroscopic measurements of atmospheric trace gases to establish long optical path lengths L(λ) with enhanced absorption in compact instruments. In cavity-enhanced broad band methods, the exact kn…
View article: Comment on egusphere-2022-1074
Comment on egusphere-2022-1074 Open
Abstract. The presence of reactive bromine in Polar Regions is a widespread phenomenon that plays an important role in the photochemistry of the Arctic and Antarctic lower troposphere, including the destruction of ozone, the disturbance of…
View article: The Interface Between Magma and Earth's Atmosphere
The Interface Between Magma and Earth's Atmosphere Open
Volatiles released from magma can form bubbles and leave the magma body to eventually mix with atmospheric air. The composition of those volatiles, as derived from measurements made after their emission, is used to draw conclusions on proc…
View article: Comment on amt-2022-274
Comment on amt-2022-274 Open
Abstract. Optical resonators are used in spectroscopic measurements of atmospheric trace gases to establish long optical path lengths L with enhanced absorption in compact instruments. In cavity-enhanced broad-band methods, the exact knowl…
View article: Supplementary material to "Source Mechanisms and transport Patterns of tropospheric BrO: Findings from long-term MAX-DOAS Measurements at two Antarctic Stations"
Supplementary material to "Source Mechanisms and transport Patterns of tropospheric BrO: Findings from long-term MAX-DOAS Measurements at two Antarctic Stations" Open
Patterns of tropospheric BrO: Findings from long-term MAX-DOAS Measurements at two Antarctic Stations' by Frieß et al.Section 1 shows histograms of the DOAS fit error and of the degrees of freedom for signal of the aerosol and BrO profiles…
View article: Source Mechanisms and transport Patterns of tropospheric BrO: Findings from long-term MAX-DOAS Measurements at two Antarctic Stations
Source Mechanisms and transport Patterns of tropospheric BrO: Findings from long-term MAX-DOAS Measurements at two Antarctic Stations Open
The presence of reactive bromine in Polar Regions is a widespread phenomenon that plays an important role in the photochemistry of the Arctic and Antarctic lower troposphere, including the destruction of ozone, the disturbance of radical c…
View article: Ozone depletion events in the Arctic spring of 2019: a new modeling approach to bromine emissions
Ozone depletion events in the Arctic spring of 2019: a new modeling approach to bromine emissions Open
Ozone depletion events (ODEs) are a common occurrence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice, or aerosols in an autocatalytic reaction cycle. Previ…
View article: New methods for the calibration of optical resonators: Integrated Calibration by means of Optical Modulation (ICOM) and Narrow Band Cavity ring-down (NB-CRD)
New methods for the calibration of optical resonators: Integrated Calibration by means of Optical Modulation (ICOM) and Narrow Band Cavity ring-down (NB-CRD) Open
Optical resonators are used in spectroscopic measurements of atmospheric trace gases to establish long optical path lengths L(λ) with enhanced absorption in compact instruments. In cavity-enhanced broad band methods, the exact knowledge of…
View article: Comment on acp-2022-334
Comment on acp-2022-334 Open
Abstract. Ozone depletion events (ODEs) are a common occurrence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice, or aerosols in an autocatalytic reaction cy…
View article: Comment on acp-2022-334
Comment on acp-2022-334 Open
Abstract. Ozone depletion events (ODEs) are a common occurrence in the boundary layer during Arctic spring. Ozone is depleted by bromine species, which are most likely emitted from snow, sea ice, or aerosols in an autocatalytic reaction cy…