A5081433447- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Vehicle emissions and performance
- Atmospheric aerosols and clouds
- Spectroscopy and Laser Applications
- Maritime Transport Emissions and Efficiency
- Water Quality Monitoring and Analysis
- Ionosphere and magnetosphere dynamics
- Calibration and Measurement Techniques
- Arctic and Antarctic ice dynamics
- Marine and coastal ecosystems
- Mercury impact and mitigation studies
- Impact of Light on Environment and Health
- Methane Hydrates and Related Phenomena
- Geophysics and Gravity Measurements
- Ocean Acidification Effects and Responses
- Public Administration and Political Analysis
- Law and Political Science
- Fire effects on ecosystems
- Libraries and Information Services
- Planetary Science and Exploration
- Astro and Planetary Science
University of Bremen
2016-2025
University of Vienna
2024-2025
Forschungsinstitut für Edelmetalle und Metallchemie
2024
Pädagogische Hochschule Wien
2021
FH Aachen
2021
Stuttgart Observatory
2021
Karlsruhe University of Education
2021
Royal Netherlands Meteorological Institute
2020
University of Bonn
2019
Folkwang University of the Arts
2019
The Global Ozone Monitoring Experiment (GOME) is a new instrument aboard the European Space Agency’s (ESA) Second Remote Sensing Satellite (ERS-2), which was launched in April 1995. main scientific objective of GOME mission to determine global distribution ozone and several other trace gases, play an important role chemistry earth’s stratosphere troposphere. measures sunlight scattered from atmosphere and/or reflected by surface nadir viewing mode spectral region 240–790 nm at moderate...
Abstract. We present an improved tropospheric nitrogen dioxide column retrieval algorithm (DOMINO v2.0) for OMI based on better air mass factors (AMFs) and a correction across-track stripes resulting from calibration errors in the backscattered reflectances. Since October 2004, NO2 retrievals Ozone Monitoring Instrument (OMI), UV/Vis nadir spectrometer onboard NASA's EOS-Aura satellite, have been used with success several scientific studies focusing quality monitoring, detection of trends,...
Abstract. During springtime in the polar regions, unique photochemistry converts inert halide salt ions (e.g. Br−) into reactive halogen species Br atoms and BrO) that deplete ozone boundary layer to near zero levels. Since their discovery late 1980s, research on depletion events (ODEs) has made great advances; however many key processes remain poorly understood. In this article we review history, chemistry, dependence environmental conditions, impacts of ODEs. This shown central role...
Gaseous elemental mercury (Hg0) is a globally distributed air toxin with long atmospheric residence time. Any process that reduces its lifetime increases potential accumulation in the biosphere. Our data from Barrow, AK, at 71° N show rapid, photochemically driven oxidation of boundary-layer Hg0 after polar sunrise, probably by reactive halogens, creates rapidly depositing species oxidized gaseous remote Arctic troposphere concentrations excess 900 pg m-3. This accumulates snowpack during...
Abstract. An eight-year long reanalysis of atmospheric composition data covering the period 2003–2010 was constructed as part FP7-funded Monitoring Atmospheric Composition and Climate project by assimilating satellite into a global model assimilation system. This provides fields chemically reactive gases, namely carbon monoxide, ozone, nitrogen oxides, formaldehyde, well aerosols greenhouse gases globally at horizontal resolution about 80 km for both troposphere stratosphere. paper describes...
A rapid increase of NO 2 columns over China has been observed by satellite instruments in recent years. We present a 10‐a regional trend x emissions from 1995 to 2004 using bottom‐up methodology and compare the emission trends with column GOME SCIAMACHY, two spaceborne instruments. use dynamic reflect dramatic change China's caused energy growth technology renewal. scenario analysis approach identify possible sources uncertainties current inventory, comparison observation data. Our best...
The first global simultaneous observations of glyoxal (CHOCHO) and formaldehyde (HCHO) columns retrieved from measurements by the Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) satellite instrument are presented compared to model calculations. pattern distribution CHOCHO is similar that HCHO. High values observed over areas with large biogenic isoprene emissions (Central Africa, parts South America, Indonesia). Also regions biomass burning anthropogenic...
Abstract. This paper reports on consolidated ground-based validation results of the atmospheric NO2 data produced operationally since April 2018 by TROPOspheric Monitoring Instrument (TROPOMI) board ESA/EU Copernicus Sentinel-5 Precursor (S5P) satellite. Tropospheric, stratospheric, and total column from S5P are compared to correlative measurements collected from, respectively, 19 Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS), 26 Network for Detection Atmospheric...
[1] Top-down constraints on global sulfur dioxide (SO2) emissions are inferred through inverse modeling using SO2 column observations from two satellite instruments (SCIAMACHY and OMI). We first evaluated the with surface measurements by applying local scaling factors a chemical transport model (GEOS-Chem) to columns retrieved instruments. The resulting annual mean mixing ratios for 2006 exhibit significant spatial correlation (r = 0.86, slope 0.91 SCIAMACHY r 0.80, 0.79 OMI) coincident in...
Abstract. A representation of atmospheric chemistry has been included in the Integrated Forecasting System (IFS) European Centre for Medium-Range Weather Forecasts (ECMWF). The new modules complement aerosol IFS composition, which is named C-IFS. C-IFS supersedes a coupled system chemical transport model (CTM) Model OZone and Related Tracers 3 was two-way to (IFS-MOZART). This paper contains description on-line implementation, an evaluation with observations comparison performance MOZART...
Abstract. Global observations of tropospheric nitrogen dioxide (NO2) columns have been shown to be feasible from space, but consistent multi-sensor records do not yet exist, nor are they covered by planned activities at the international level. Harmonised, multi-decadal NO2 and their associated uncertainties can provide crucial information on how emissions concentrations oxides evolve over time. Here we describe development a new, community best-practice retrieval algorithm based synthesis...
The ratio of stable isotopes in leaves and wood reveals an increase nitrogen availability Panamanian Thai tropical forests.
Abstract. Tropospheric NO2, a key pollutant in particular cities, has been measured from space since the mid-1990s by GOME, SCIAMACHY, OMI, and GOME-2 instruments. These data provide unique global long-term dataset of tropospheric pollution. However, observations differ spatial resolution, local time measurement, viewing geometry, other details. All these factors can severely impact retrieved NO2 columns. In this study, we present three ways to account for instrumental differences trend...
Abstract. On board the Copernicus Sentinel-5 Precursor (S5P) platform, TROPOspheric Monitoring Instrument (TROPOMI) is a double-channel, nadir-viewing grating spectrometer measuring solar back-scattered earthshine radiances in ultraviolet, visible, near-infrared, and shortwave infrared with global daily coverage. In ultraviolet range, its spectral resolution radiometric performance are equivalent to those of predecessor OMI, but horizontal at true nadir improved by an order magnitude. This...
Abstract. Air mass factor (AMF) calculation is the largest source of uncertainty in NO2 and HCHO satellite retrievals situations with enhanced trace gas concentrations lower troposphere. Structural arises when different retrieval methodologies are applied within scientific community to same observations. Here, we address issue AMF structural via a detailed comparison methods that structurally between seven groups for measurements from Ozone Monitoring Instrument (OMI). We estimate escalation...
Abstract. Despite its key role in climate change, large uncertainties persist our knowledge of the anthropogenic emissions carbon dioxide (CO2) and no global observing system exists that allows us to monitor from localized CO2 sources with sufficient accuracy. The Orbiting Carbon Observatory-2 (OCO-2) satellite retrievals column-average dry-air mole fractions (XCO2). However, regional enhancements individual point are usually small, compared background concentration natural variability,...
Abstract. The TROPOspheric Monitoring Instrument (TROPOMI), launched in October 2017 on board the Sentinel-5 Precursor (S5P) satellite, monitors composition of Earth's atmosphere at an unprecedented horizontal resolution as fine 3.5 × 5.5 km2. This paper assesses performances TROPOMI formaldehyde (HCHO) operational product compared to its predecessor, OMI (Ozone Instrument) HCHO QA4ECV product, different spatial and temporal scales. parallel development two algorithms favoured consistency...
Abstract. Satellite observations of the high-resolution TROPOspheric Monitoring Instrument (TROPOMI) on Sentinel-5 Precursor can be used to observe nitrogen dioxide (NO2) at city scales quantify short time variability oxide (NOx) emissions and lifetimes a daily seasonal basis. In this study, 2 years TROPOMI tropospheric NO2 columns, having spatial resolution up 3.5 km × 5.5 km, have been analyzed together with wind ozone data. NOx emission fluxes are estimated for 50 different sources...
Abstract. The Geostationary Environment Monitoring Spectrometer (GEMS), launched in 2020, provides both temporally and spatially continuous air quality data from geostationary Earth orbit (GEO). This study first investigates the seasonal variations diurnal behavior of nitrogen dioxide (NO2) tropospheric vertical column densities (TropVCDs) over Seoul metropolitan area (SMA) using GEMS data, retrieved by IUP-UB algorithm. We find that magnitude NO2 TropVCDs their have significant dependences....
Unlike other heavy metals that are inherently associated with atmospheric aerosols, mercury in ambient air exists predominantly the gaseous elemental form. Because of its prolonged residence time, vapor is distributed on a global scale. Recently, Canadian researchers have discovered total levels lower tropospheric boundary layer Arctic often significantly depleted during months after polar sunrise. A possible explanation may involve oxidation mercury, followed by adsorption and deposition...