A5074533906- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Atmospheric aerosols and clouds
- Marine and coastal ecosystems
- Spectroscopy and Laser Applications
- Spacecraft Design and Technology
- Gas Sensing Nanomaterials and Sensors
- Atomic and Subatomic Physics Research
- Maritime Transport Emissions and Efficiency
- Scientific Measurement and Uncertainty Evaluation
- Ocean Acidification Effects and Responses
- Maritime Navigation and Safety
- Oceanographic and Atmospheric Processes
- Wind and Air Flow Studies
- Solar and Space Plasma Dynamics
- Meteorological Phenomena and Simulations
- Oil Spill Detection and Mitigation
- Fluid Dynamics and Turbulent Flows
- Water Quality Monitoring and Analysis
- COVID-19 impact on air quality
- Vehicle emissions and performance
- Geophysics and Gravity Measurements
Max Planck Institute for Chemistry
2018-2025
Air pollution is growing fastest in monsoon-affected South Asia. During the dry winter monsoon, fumes disperse toward Indian Ocean, creating a vast haze, but their fate during wet summer monsoon has been unclear. We performed atmospheric chemistry measurements by aircraft Oxidation Mechanism Observations campaign, sampling outflow upper troposphere between Mediterranean and Ocean. The measurements, supported model calculations, show that sustains remarkably efficient cleansing mechanism...
Abstract New particle formation (NPF) in the tropical upper troposphere is a globally important source of atmospheric aerosols 1–4 . It known to occur over Amazon basin, but nucleation mechanism and chemical precursors have yet be identified 2 Here we present comprehensive situ aircraft measurements showing that extremely low-volatile oxidation products isoprene, particularly certain organonitrates, drive NPF Amazonian troposphere. The organonitrates originate from OH-initiated isoprene...
Abstract. Mechanisms of tropospheric ozone (O3) formation are generally well understood. However, studies reporting on net production rates (NOPRs) directly derived from in situ observations challenging and sparse number. To analyze the role nitric oxide (NO) upper tropical troposphere above Atlantic Ocean western Africa, we present trace gas obtained during CAFE-Africa (Chemistry Atmosphere: Field Experiment Africa) campaign August September 2018. The vertical profile measured NO along...
Abstract. Laser-induced fluorescence (LIF) is a widely used technique for both laboratory-based and ambient atmospheric chemistry measurements. However, LIF instruments require calibrations in order to translate instrument response into concentrations of chemical species. Calibration measuring OH HO2 (HOx) typically involves the photolysis water vapor by 184.9 nm light, thereby producing quantitative amounts HO2. For ground-based HOx instruments, this method calibration done at one pressure...
Abstract. Nitrogen oxides (NOx≡NO+NO2) are centrally involved in the photochemical processes taking place Earth's atmosphere. Measurements of NO2, particularly remote areas where concentrations order parts per trillion by volume (pptv), still a challenge and subject to extensive research. In this study, we present NO2 measurements via photolysis–chemiluminescence during research aircraft campaign CAFE Africa (Chemistry Atmosphere – Field Experiment Africa) 2018 around Cabo Verde results...
Abstract. During the OMO (Oxidation Mechanism Observation) mission, trace gas measurements were performed on board HALO (High Altitude Long Range) research aircraft in summer 2015 order to investigate outflow of South Asian monsoon and its influence composition anticyclone (AMA) upper troposphere over eastern Mediterranean Arabian Peninsula. This study focuses situ observations hydrogen peroxide (H2O2obs) organic hydroperoxides (ROOHobs) as well their precursors loss processes. Observations...
Abstract. This study focuses on the distribution of hydrogen peroxide (H2O2) in upper tropical troposphere at altitudes between 8 and 15 km based situ observations during Chemistry Atmosphere: Field Experiment Africa (CAFE-Africa) campaign conducted August–September 2018 over Atlantic Ocean western Africa. The measured mixing ratios show no clear trend latitudinal with locally increased levels (up to 1 ppbv) within Intertropical Convergence Zone (ITCZ), African coastal area, as well...
Abstract Tropospheric ozone (O 3 ) is an important greenhouse gas that also hazardous to human health. The formation of O sensitive the levels its precursors NO x (≡NO + 2 and peroxy radicals, for example, generated by oxidation volatile organic compounds (VOCs). A better understanding this sensitivity will show how changes in these trace gases could affect today future, thus air quality climate. In study, we investigate tropical troposphere based on situ observations NO, HO from four...
Abstract. In the atmospheric boundary layer (ABL), incomplete mixing (i.e., segregation) results in reduced chemical reaction rates compared to those expected from mean values and rate constants derived under well mixed conditions. Recently, segregation has been suggested as a potential cause of discrepancies between modelled measured OH radical concentrations, especially high isoprene Therefore, influence on radicals with investigated by modelling studies one ground-based aircraft campaign....
In the tropics, intense solar radiation drives photochemistry and strong convection, transporting air from boundary layer to upper troposphere. Conditions in tropics are characterized by high humidity UV intensity enhancing hydroxyl (OH) radical production. addition, OH radicals ozone (O3) formed through reactions of HOx (OH + HO2) with nitrogen oxides (NOx), latter being produced lightning abundant convective systems. The convection also transports volatile organic compounds (VOCs), notably...
Tropospheric ozone (O) is an important greenhouse gas that also hazardous to human health. O formed photochemically from nitrogen dioxide (NO) (with oxygen and sunlight), which in turn generated through oxidation of nitric oxide by peroxy radicals (HO or RO). The formation can be sensitive the levels its precursors NOx (≡ NO + NO) radicals, e.g., volatile organic compounds (VOCs). A better understanding this sensitivity will show how changes these trace gases could affect today future, thus...
The campaign Chemistry of the Atmosphere Field Experiment (CAFE) Brazil was conducted in Amazon rainforest December 2022 and January 2023 to study new particle formation outflow convective systems over rainforest. In framework this campaign, photochemical aerosol processes tropical troposphere were investigated at different altitudes from boundary layer up 14 km using High Altitude Long Range Research Aircraft (HALO).The HydrOxyl Radical measurement Unit based on fluorescence Spectroscopy...
Abstract. Mechanisms of tropospheric ozone (O3) formation are generally well understood. However, studies reporting on net production rates (NOPRs) directly derived from in-situ observations challenging, and sparse in number. To analyze the role nitric oxide (NO) upper tropical troposphere above Atlantic Ocean West African continent, we present situ trace gas obtained during CAFE-Africa (Chemistry Atmosphere: Field Experiment Africa) campaign August September 2018. The vertical profile...
Abstract. Nitrogen oxides (NOx ≡ NO + NO2) are centrally involved in the photochemical processes taking place earth’s atmosphere. Measurements of NO2, particularly remote areas where concentrations order pptv, still a challenge and subject to extensive research. In this study, we present NO2 measurements via photolysis-chemiluminescence during research aircraft campaign CAFE Africa (Chemistry Atmosphere – Field Experiment Africa) 2018 around Cabo Verde as well results laboratory experiments...
Abstract. During the OMO (Oxidation Mechanism Observation) mission, trace gas measurements were performed onboard HALO (High Altitude LOng range) research aircraft in summer 2015 order to investigate outflow of south Asian monsoon and its influence on composition Monsoon Anticyclone (AMA) upper troposphere over eastern Mediterranean Arabian Peninsula. This study focuses situ observations hydrogen peroxide (H2O2) organic hydroperoxides (ROOH), as well their precursors loss processes....
Abstract. This study focuses on the distribution of hydrogen peroxide (H2O2) in upper tropical troposphere at altitudes between 8 and 15 km based situ observations during Chemistry Atmosphere – Field Experiment Africa (CAFE-Africa) campaign conducted August–September 2018 over Atlantic Ocean western Africa. The measured mixing ratios show a nearly uniform latitudinal with locally increased levels (up to 1 ppbv) within Intertropical Convergence Zone (ITCZ), African coastal area, as well...
Hydroxyl radicals are the most predominant daytime initiator for atmospheric oxidation processes. Due to COVID -19 pandemic, there was a considerable reduction in emissions from industry and all means of transportation during spring 2020. The main objective BLUESKY campaign is understand effect these reduced on composition such as trace gases, aerosols, cloud properties. OH HO2 were measured with HORUS (HydrOxyl Radical measurement Unit based fluorescence Spectroscopy), eight research...