A5050953499- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Spectroscopy and Laser Applications
- Calibration and Measurement Techniques
- Geophysics and Gravity Measurements
- Air Quality Monitoring and Forecasting
- Solar and Space Plasma Dynamics
- Meteorological Phenomena and Simulations
- Climate variability and models
- Scientific Measurement and Uncertainty Evaluation
- Advanced Chemical Sensor Technologies
- GNSS positioning and interference
- Astro and Planetary Science
- Industrial Gas Emission Control
- Toxic Organic Pollutants Impact
- Advanced Biosensing Techniques and Applications
- HIV/AIDS Research and Interventions
- Geochemistry and Geologic Mapping
- Medical Imaging Techniques and Applications
- Cardiovascular Function and Risk Factors
- Disaster Response and Management
- Remote Sensing and Land Use
- Advanced Fluorescence Microscopy Techniques
Karlsruhe Institute of Technology
2015-2024
National Institute of Meteorology
2007-2012
FZI Research Center for Information Technology
2002-2009
University Medical Center Utrecht
2008
Karlsruhe University of Education
1996-2004
Abstract. An extensive observational data set, consisting of more than 106 SF6 vertical profiles from MIPAS measurements distributed over the whole globe has been condensed into monthly zonal means mean age air for period September 2002 to January 2010, binned at 10° latitude and 1–2 km altitude. The were analysed with respect their temporal variation by fitting a regression model constant linear increase term, 2 proxies QBO variation, sinusoidal terms seasonal semi-annual overtones...
Retrieval of abundances atmospheric species from limb infrared emission spectra requires accurate knowledge the pointing instrument in terms elevation, as well temperature and pressure profiles. An optimal estimation‐based method is presented to infer these quantities measured spectra. The successful efficient joint retrieval largely correlated depends strongly on proper selection space, spectral microwindows, choice reasonable constraints which force solution be stable. proposed strategy...
Abstract. Retrievals of temperature, H2O, O3, HNO3, CH4, N2O, ClONO2 and ClO from MIPAS reduced spectral resolution nominal mode limb emission measurements outperform retrievals respective full both in terms altitude precision. The estimated precision (including measurement noise propagation uncertain parameters randomly varying the time domain) are typically 0.5–1.4 K 2–3.5 km for temperature between 10 50 altitude, 5–6%, 2–4 H2O below 30 4–5%, 2.5–4.5 O3 15 40 3–8%, 3–5 HNO3 35 5–8%, 2–3...
Abstract. A new and improved setup of the SF6 retrieval together with a newly calibrated version MIPAS-ENVISAT level 1b spectra (version 5, ESA data 5.02/5.06) was used to obtain global set, covering total observational period MIPAS from July 2002 April 2012 for first time. Monthly zonally averaged profiles were converted into mean age air using tropospheric SF6-reference curve. The obtained set compared airborne measurements. temporal evolution then investigated in 10° latitude 1–2 km...
Abstract. Global distributions of profiles sulphur hexafluoride (SF6) have been retrieved from limb emission spectra recorded by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat covering period September 2002 to March 2004. Individual SF6 a precision 0.5 pptv below 25 km altitude and vertical resolution 4–6 up 35 altitude. These data validated versus in situ observations obtained during balloon flights cryogenic whole-air sampler. For tropical troposphere...
Abstract. We use limb emission spectra of the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard ENVIronmental SATellite (ENVISAT) to derive first global distribution peroxyacetyl nitrate (PAN) in upper troposphere. PAN is generated tropospheric air masses polluted by fuel combustion or biomass burning and acts as a reservoir carrier NOx cold free exhibits continuum-like broadband structures mid-infrared region was retrieved contiguous analysis window covering...
We used temperature data from the Michelson Interferometer for Passive Atmospheric Sounding on board ESA's Envisat satellite to analyze responses in mesosphere and thermosphere up 170 km a major stratospheric sudden warming (SSW) which occurred January 2009. The observations show clear signatures of mesospheric cooling thermospheric warming, latter peaking at 120–140 agreement with model predictions. From analysis zonal structure during SSW pronounced wave 1 pattern was found entire middle...
The Scanning Imaging Absorption Spectrometer for Atmospheric Chartography (SCIAMACHY) onboard the ENVISAT satellite provides first time a global view on stratospheric bromine monoxide (BrO). Here we focus 10 day period in September 2002. BrO retrievals are compared with modeled profiles, based estimated inorganic (Br y ) from CFC‐11 by Michelson Interferometer Passive Sounding (MIPAS) and calculated BrO/Br ratio photochemical model constrained SCIAMACHY NO 2 retrievals. observations broadly...
Abstract In late September 2002, an Antarctic major stratospheric warming occurred, which led to a strong distortion of the southern polar vortex and split its mid- upper-stratospheric parts. Such event had never before been observed since beginning regular temperature observations in 1950s. The is studied by means nonoperational level-2 CH4, N2O, CFC-11, O3 data, retrieved at Institute for Meteorology Climate Research Karlsruhe (IMK) from high-resolution atmospheric limb emission spectra...
We present water vapor profiles obtained from infrared limb emission measurements recorded by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board European Environmental Satellite (Envisat). These retrievals are based constrained nonlinear least squares fitting. The very sensitive to radiative signals of thin transparent clouds and showing any signature cloud contamination have been rigorously excluded. vertical resolution retrieved is 4.5 6.5 km up an altitude...
Abstract. We present global distributions of carbon monoxide (CO) from the upper troposphere to mesosphere observed by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat. Vertically resolved volume mixing ratio profiles have been retrieved 4.7 μm limb emission spectra under consideration non-local thermodynamic equilibrium. The precision individual CO is typically 5–30 ppbv (15–40% altitudes greater than 40 km and lower 15 30–90% within 15–40 km). Estimated...
Abstract. Vertical profiles of mixing ratios C2H6, C2H2, HCN, and PAN were retrieved from MIPAS reduced spectral resolution nominal mode limb emission measurements. The retrieval strategy follows that the analysis high measurements, with occasional adjustments to cope under which is operated since 2005. measurements January 2005 2010 have been analyzed special emphasis on October 2007. Largest are found in troposphere, reach 1.2 ppbv for 1 600 pptv PAN, 450 C2H2. estimated precisions case...
Abstract. Vertical profiles of CFC-11 (CCl3F) and CFC-12 (CCl2F2) have been measured with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) global coverage under daytime nighttime conditions. The profile retrieval is based on constrained nonlinear least squares fitting limb spectral radiance to modeled spectra. in its ν4-band at 850 cm−1, analyzed ν6-band 922 cm−1. To stabilize retrievals, a Tikhonov-type smoothing constraint applied. Main error sources are measurement...
Abstract. Vertically resolved distributions of sulfur dioxide (SO2) with global coverage in the height region from upper troposphere to ~20 km altitude have been derived observations by Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on Envisat period July 2002 April 2012. Retrieved volume mixing ratio profiles representing single measurements are characterized typical errors range 70–100 pptv and a vertical resolution ranging 3 5 km. Comparison Chemistry Experiment Fourier...
Abstract. We report on HCFC-22 data acquired by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) in reduced spectral resolution nominal observation mode. The cover period from January 2005 to April 2012 and altitude range upper troposphere (above cloud top altitude) about 50 km. profile retrieval was performed constrained nonlinear least squares fitting of modelled spectra measured limb radiances. ν4-band at 816.5 ± 13 cm−1 used retrieval. A Tikhonov-type smoothing...
Vertical profiles of ClONO 2 and HNO 3 inside the Arctic vortex have been retrieved from infrared limb emission spectra recorded during balloon flights on January 13 in night March 14/15, 1992 Esrange, Sweden (68°N) as part European Stratospheric Ozone Experiment (EASOE). The instrumentation used was cryogenic M ichelson I nterferometer for P assive A tmospheric S ounding, B alloon‐borne version (MIPAS‐B). Low abundances mid‐January indicate that a significant portion had already converted...
Abstract. Altitude profiles of ClONO2 retrieved with the IMK (Institut für Meteorologie und Klimaforschung) science-oriented data processor from MIPAS/Envisat (Michelson Interferometer for Passive Atmospheric Sounding on Envisat) mid-infrared limb emission measurements between July 2002 and March 2004 have been validated by comparison balloon-borne (Mark IV, FIRS2, MIPAS-B), airborne (MIPAS-STR), ground-based (Spitsbergen, Thule, Kiruna, Harestua, Jungfraujoch, Izaña, Wollongong, Lauder),...
Formic acid (HCOOH) vertical profiles have been retrieved from MIPAS‐ENVISAT satellite data in the upper troposphere for first time. Based on new spectroscopic line‐strength measurements by Vander Auwera et al. (2007) of HCOOH, a retrieval setup was developed and optimized to study its global distribution between 2002 2008. A strong seasonality, directly associated plant growth corresponding biogenic emissions, is observed dominates middle latitudes Northern Hemisphere. Here, mean monthly...
[1] We present vertically resolved thermospheric temperatures and NO abundances in terms of volume mixing ratio retrieved simultaneously from spectrally 5.3 μm emissions recorded by the Michelson Interferometer for Passive Atmospheric Spectroscopy (MIPAS) its upper atmospheric observation mode during 2005–2009. These measurements are unique since they represent first global observations temperature both day night conditions taken space. A retrieval scheme has been developed which accounts...
Abstract During the solar proton events (SPE) on 23–30 January and 7–15 March 2012, Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) Envisat monitored atmospheric temperature composition with global coverage. In Northern Hemisphere, SPE started at end of a polar stratospheric warming period. The effect is superimposed by large‐scale subsidence mesospheric NO x ‐rich air, which partly masks direct chemical effects. SPE‐induced increases 5, 20, 50, 100 ppbv altitudes 57, 60,...
Abstract. We present a global carbonyl sulfide (OCS) data set covering the period June 2002 to April 2012, derived from FTIR (Fourier transform infrared) limb emission spectra measured with Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on ENVISAT satellite. The vertical resolution is 4–5 km in height region 6–15 and 15 at 40 altitude. total estimated error amounts 40–50 pptv between 10 20 120 MIPAS OCS show no systematic bias respect balloon observations, deviations...
Abstract. A new global set of atmospheric temperature profiles is retrieved from recalibrated radiance spectra recorded with the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS). Changes respect to previous data versions include a radiometric calibration considering time dependency detector nonlinearity and more robust frequency scheme. Temperature using smoothing constraint, while tangent altitude pointing information constrained optimal estimation. ECMWF ERA-Interim used...
Abstract. We present a global climatology of upper-tropospheric hydrogen cyanide (HCN), carbon monoxide (CO), acetylene (C2H2), ethane (C2H6), peroxyacetyl nitrate (PAN), and formic acid (HCOOH) obtained from observations the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) on board Environmental Satellite (Envisat) between 2002 2012. At northern midlatitudes high latitudes, biomass burning tracer HCN, but also CO, PAN, HCOOH, exhibit maxima during spring and/or summer...
The functionality and characteristics of six different data processors (i.e., retrieval codes in their actual software hardware environment) for analysis high‐resolution limb emission infrared spectra recorded by the space‐borne Michelson Interferometer Passive Atmospheric Sounding (MIPAS) have been validated means a blind test experiment based on synthetic spectra. For this purpose self‐consistent set atmospheric state parameters, including pressure, temperature, vibrational temperatures,...