- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Air Quality Monitoring and Forecasting
- Vehicle emissions and performance
- Maritime Transport Emissions and Efficiency
- Air Quality and Health Impacts
- Water Quality Monitoring and Analysis
- Spectroscopy and Laser Applications
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Calibration and Measurement Techniques
- Mercury impact and mitigation studies
- Geophysics and Gravity Measurements
- Environmental Policies and Emissions
- Impact of Light on Environment and Health
- Toxic Organic Pollutants Impact
- Planetary Science and Exploration
- GNSS positioning and interference
- Cryospheric studies and observations
- Technical Engine Diagnostics and Monitoring
- Climate variability and models
- Seismic Imaging and Inversion Techniques
- Solar and Space Plasma Dynamics
- Ocean Acidification Effects and Responses
University of Bremen
2015-2024
National Centre for Atmospheric Science
2004
We construct global budgets of atmospheric glyoxal and methylglyoxal with the goal quantifying their potential for secondary organic aerosol (SOA) formation via irreversible uptake by aqueous aerosols clouds. conduct a detailed simulation in GEOS‐Chem 3‐D chemical transport model including our best knowledge source sink processes. Our resulting estimates sources are 45 Tg −1 140 , respectively. Oxidation biogenic isoprene contributes globally 47% 79% methylglyoxal. The second most important...
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...
Measurements from the Global Ozone Monitoring Experiment GOME have been analysed for tropospheric BrO in northern hemispheric spring and summer 1997. Tropospheric excess columns determined by subtracting measurements a longitude range which is assumed to represent background conditions. From February until end of May enhanced are observed over Hudson Bay area parts Canadian Arctic. This large persistent event has not reported before can only be explained local source bromine. In addition,...
Abstract. A new approach to derive tropospheric concentrations of some atmospheric trace gases from ground-based UV/vis measurements is described. The instrument, referred as the MAX-DOAS, based on well-known instruments, which use sunlight scattered in zenith sky light source and method Differential Optical Absorption Spectroscopy (DOAS) column amounts absorbers like ozone nitrogen dioxide. Substantial enhancements have been applied this standard setup different lines sight near horizon...
We review the standard nitrogen dioxide (NO 2 ) data product (Version 1.0.), which is based on measurements made in spectral region 415–465 nm by Ozone Monitoring Instrument (OMI) NASA Earth Observing System‐Aura satellite. A number of ground‐ and aircraft‐based have been used to validate product's three principal quantities: stratospheric, tropospheric, total NO column densities under nearly or completely cloud‐free conditions. The validation OMI complicated a factors, greatest that...
Abstract. During the first measurement campaign of EU FORMAT project in summer 2002 near Milan, northern Italy, ground-based scattered light differential optical absorption spectroscopy (DOAS) measurements were performed using a new multi-axis instrument. From data set this four week period, detailed analysis results three days, 12–14 August, are presented exemplary. Slant column densities for formaldehyde (HCHO) and oxygen dimer (O4) have been retrieved, employing fitting windows from 335...
Abstract. Glyoxal, the smallest dicarbonyl, which has recently been observed from space, is expected to provide indications on volatile organic compounds (VOC) oxidation and secondary aerosol formation in troposphere. Glyoxal (CHOCHO) known be mostly of natural origin produced during biogenic VOC oxidation. However, a number anthropogenically emitted hydrocarbons, like acetylene aromatics, have positively identified as CHOCHO precursors. The present study investigates contribution pollution...
Abstract. We attempt for the first time to retrieve lower-tropospheric vertical profile information 8 quantities from ground-based Multi-Axis Differential Optical Absorption Spectroscopy (MAX-DOAS) observations. The components retrieved are aerosol extinction coefficients at two wavelengths, 357 and 476 nm, NO2, HCHO, CHOCHO, H2O, SO2, O3 volume mixing ratios. A Japanese MAX-DOAS retrieval algorithm, version 1 (JM1), is applied observations performed Cabauw, Netherlands (51.97° N, 4.93° E),...
Abstract. The results of a comparison exercise radiative transfer models (RTM) various international research groups for Multiple AXis Differential Optical Absorption Spectroscopy (MAX-DOAS) viewing geometry are presented. Besides the assessment agreement between different models, second focus was systematic investigation sensitivity MAX-DOAS technique under geometries and aerosol conditions. In contrast to previous exercises, box-air-mass-factors (box-AMFs) atmospheric height layers were...
Abstract. Tropospheric glyoxal and formaldehyde columns retrieved from the SCIAMACHY satellite instrument in 2005 are used with IMAGESv2 global chemistry-transport model its adjoint a two-compound inversion scheme designed to estimate continental source of glyoxal. The observations provide an important constraint on production isoprene model, since degradation constitutes both formaldehyde. Current modelling studies underestimate largely observed columns, pointing existence additional land...
Dutch Aerosol and Nitrogen Dioxide Experiments for Validation of OMI SCIAMACHY (DANDELIONS) is a project that encompasses validation spaceborne measurements NO 2 by the Ozone Monitoring Instrument (OMI) Scanning Imaging Absorption Spectrometer Atmospheric Cartography (SCIAMACHY), aerosol Advanced Along‐Track Radiometer (AATSR), using an extensive set ground‐based balloon over polluted area Netherlands. We present data ground‐based, balloon, satellite on , aerosols, ozone obtained from two...
Abstract. Iodine species in the troposphere are linked to ozone depletion and new particle formation. In this study, a full year of iodine monoxide (IO) columns retrieved from measurements SCIAMACHY satellite instrument is presented, coupled with discussion their uncertainties detection limits. The largest amounts IO found near springtime Antarctic. A seasonal variation Antarctica revealed high values springtime, slightly less summer period again larger autumn. winter, no elevated levels...
Abstract. Collocated data sets of glyoxal (CHO.CHO) and formaldehyde (HCHO) were retrieved for the first time from measurements Global Ozone Monitoring Experiment-2 (GOME-2) during two years operation in 2007 2008. Both oxygenated Volatile Organic Compounds, OVOC, are key intermediate species produced oxidation precursor hydrocarbons. Their short lifetime a few hours lower troposphere links them to emission sources makes useful tracers photochemical activity. The global composite maps GOME-2...
Abstract. In June 2009, 22 spectrometers from 14 institutes measured tropospheric and stratospheric NO2 the ground for more than 11 days during Cabauw Intercomparison Campaign of Nitrogen Dioxide measuring Instruments (CINDI), at Cabauw, NL (51.97° N, 4.93° E). All visible instruments used a common wavelength range set cross sections spectral analysis. Most were multi-axis design with analysis by differential spectroscopy software (MAX-DOAS), whose non-zenith slant columns compared examining...
Abstract. In September 2016, 36 spectrometers from 24 institutes measured a number of key atmospheric pollutants for period 17 d during the Second Cabauw Intercomparison campaign Nitrogen Dioxide measuring Instruments (CINDI-2) that took place at Cabauw, Netherlands (51.97∘ N, 4.93∘ E). We report on outcome formal semi-blind intercomparison exercise, which was held under umbrella Network Detection Atmospheric Composition Change (NDACC) and European Space Agency (ESA). The three major goals...
Recent comparisons between satellite observed and global model simulated glyoxal (CHOCHO) have consistently revealed a large unknown source of CHOCHO over China. We examine this missing by analyzing SCIAMACHY vertical column densities (VCDs) using Regional chEmical trAnsport Model (REAM). This is first quantified the difference REAM VCDs (ΔC ), which little overlap with high biogenic isoprene emissions but are collocated dense population anthropogenic NO x VOC emissions. then apply inverse...
Abstract. We present intercomparison results for formaldehyde (HCHO) slant column measurements performed during the Cabauw Intercomparison campaign of Nitrogen Dioxide measuring Instruments (CINDI) that took place in Cabauw, Netherlands, summer 2009. During two months, nine atmospheric research groups simultaneously operated MAX-DOAS (MultiAXis Differential Optical Absorption Spectroscopy) instruments various designs to record UV-visible spectra scattered sunlight at different elevation...
Abstract. From June to July 2009 more than thirty different in-situ and remote sensing instruments from all over the world participated in Cabauw Intercomparison campaign for Nitrogen Dioxide measuring Instruments (CINDI). The took place at KNMI's Experimental Site Atmospheric Research (CESAR) Netherlands. Its main objectives were determine accuracy of state-of-the-art ground-based measurement techniques detection atmospheric nitrogen dioxide (both sensing), investigate their usability...
Abstract. The second Cabauw Intercomparison of Nitrogen Dioxide measuring Instruments (CINDI-2) took place in (the Netherlands) September 2016 with the aim assessing consistency multi-axis differential optical absorption spectroscopy (MAX-DOAS) measurements tropospheric species (NO2, HCHO, O3, HONO, CHOCHO and O4). This was achieved through coordinated operation 36 spectrometers operated by 24 groups from all over world, together a wide range supporting reference observations (in situ...
Abstract. Multi-axis differential optical absorption spectroscopy (MAX-DOAS) and direct sun NO2 vertical column network data are used to investigate the accuracy of tropospheric measurements GOME-2 instrument on MetOp-A satellite platform OMI Aura. The study is based 23 MAX-DOAS 16 instruments at stations distributed worldwide. A method quantify correct for horizontal dilution effects in heterogeneous field conditions proposed. After systematic application this correction urban sites, found...
The abnormal high wave activity in austral spring 2002 led to the first observation of a major stratospheric warming southern hemisphere resulting net winter increase mid‐ latitude total ozone until September 2002. In previous years chemical depletion inside Antarctic vortex was sufficiently reduce mean south 50° values slightly below that March (fall) as observed by GOME during period 1995–2001. This unusual event permits us examine interannual variability and OClO (the latter being an...
Abstract. Glyoxal, CHO.CHO, is produced during the oxidation of volatile organic compounds, VOC, released by anthropogenic activities, biogenic processes and biomass burning. It has a short chemical lifetime few hours in boundary layer lower troposphere therefore serves as an indicator marker photochemical hot-spots their response to changing atmospheric conditions around globe. For this reason more than five years CHO.CHO observations (2002–2007), retrieved from radiances measured satellite...