René Stübi
A5017986196- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Spectroscopy and Laser Applications
- Climate variability and models
- Ionosphere and magnetosphere dynamics
- Air Quality Monitoring and Forecasting
- Meteorological Phenomena and Simulations
- Wind and Air Flow Studies
- Gas Sensing Nanomaterials and Sensors
- COVID-19 impact on air quality
- Analytical Chemistry and Sensors
- Spacecraft Design and Technology
- Healthcare Systems and Challenges
- Metabolism and Genetic Disorders
- Calibration and Measurement Techniques
- Water Quality Monitoring and Analysis
- Solar and Space Plasma Dynamics
- Atmospheric aerosols and clouds
- Clinical Nutrition and Gastroenterology
- Air Quality and Health Impacts
- Ecosystem dynamics and resilience
- Inertial Sensor and Navigation
- Climate Change Policy and Economics
- Plant Water Relations and Carbon Dynamics
Federal Office of Meteorology and Climatology MeteoSwiss
2016-2025
Universities Space Research Association
2020
Zürich Airport (Switzerland)
2012-2015
Météo-France
2014
Karlsruhe Institute of Technology
2004
Aristotle University of Thessaloniki
2000
Since 1996, quality assurance experiments of electrochemical concentration cell (ECC) ozonesondes two different model types (SPC‐6A and ENSCI‐Z) have been conducted in the environmental simulation facility at Research Centre Juelich within framework Ozone Sonde Intercomparison Experiment (JOSIE). The shown that performance characteristics ECC‐sonde can be significantly different, even when operated under same conditions. Particularly above 20 km ENSCI‐Z sonde tends to measure 5–10% more...
Abstract. Ozone forms in the Earth's atmosphere from photodissociation of molecular oxygen, primarily tropical stratosphere. It is then transported to extratropics by Brewer–Dobson circulation (BDC), forming a protective ozone layer around globe. Human emissions halogen-containing ozone-depleting substances (hODSs) led decline stratospheric until they were banned Montreal Protocol, and since 1998 upper stratosphere rising again, likely recovery halogen-induced losses. Total column...
Abstract Despite evidence from a number of Earth systems that abrupt temporal changes known as regime shifts are important, their nature, scale and mechanisms remain poorly documented understood. Applying principal component analysis, change‐point analysis sequential t ‐test to 72 time series, we confirm the 1980s shift represented major change in Earth's biophysical upper atmosphere depths ocean Arctic Antarctic, occurred at slightly different times around world. Using historical climate...
Abstract Throughout spring and summer 2020, ozone stations in the northern extratropics recorded unusually low free troposphere. From April to August, from 1 8 kilometers altitude, was on average 7% (≈4 nmol/mol) below 2000–2020 climatological mean. Such ozone, over several months, at so many stations, has not been observed any previous year since least 2000. Atmospheric composition analyses Copernicus Atmosphere Monitoring Service simulations NASA GMI model indicate that large 2020...
The Arctic polar vortex exhibited widespread regions of low temperatures during the winter 2005, resulting in significant ozone depletion by chlorine and bromine species. We show that chemical loss column (ΔO 3 ) volume air cold enough to support existence stratospheric clouds (V PSC both exceed levels found for any other past 40 years. Cold conditions lowermost stratosphere (e.g., between potential 360 400 K) were particularly unusual compared previous Measurements indicate ΔO = 121 ± 20 DU...
We use ozone observations from sondes, regular aircraft, and alpine surface sites in a self‐consistent analysis to determine robust changes the time evolution of over Europe. The data are most coherent since 1998, with similar interannual variability trends. Ozone has decreased slowly an annual mean trend −0.15 ppb yr −1 at ∼3 km largest decrease summer. There some substantial differences between sondes other data, particularly early 1990s. aircraft show that increased late 1994 until but...
A balloon flight to compare 18 ozonesondes with an ozone photometer and column measurements from Dobson Brewer spectrophotometers was completed in April 2004. The core experiment consisted of 12 electrochemical concentration cell ozonesondes, 6 Science Pump Corporation (SP) ENSCI (ES), prepared cathode solution concentrations 0.5% KI (half buffer) 1.0% (full buffer). Auxiliary two sondes 2.0% (no buffer), reconditioned sondes, Japanese‐KC96 sondes. Precision each group similarly <2–3%....
We present validation studies of MLS version 2.2 upper tropospheric and stratospheric ozone profiles using ozonesonde lidar data as well climatological data. Ozone measurements from over 60 stations worldwide three are compared with coincident The between 150 3 hPa agree measurements, within 8% for the global average. values at 215 biased high to ozonesondes by ∼20% middle latitude, although there is a lot variability in this altitude region. Comparisons ground‐based Mauna Loa, Hawaii, Table...
Abstract. Trends in the vertical distribution of ozone are reported and compared for a number new recently revised data sets. The amount ozone-depleting compounds stratosphere (as measured by equivalent effective stratospheric chlorine – EESC) was maximised second half 1990s. We examine periods before after peak to see if any change trend is discernible record that might be attributable EESC trend, though no attribution attempted. Prior 1998, trends upper (~ 45 km, 4 hPa) found −5 −10 % per...
Abstract. The ozone profile records of a large number limb and occultation satellite instruments are widely used to address several key questions in research. Further progress some domains depends on more detailed understanding these data sets, especially their long-term stability mutual consistency. To this end, we made systematic assessment 14 sounders that, together, provide than three decades global measurements. In particular, considered the latest operational Level-2 by SAGE II, III,...
Abstract The Southern Hemisphere ADditional OZonesonde (SHADOZ) network was assembled to validate a new generation of ozone‐monitoring satellites and better characterize the vertical structure tropical ozone in troposphere stratosphere. Beginning with nine stations 1998, more than 7,000 P ‐ T U profiles are available from 14 SHADOZ sites that have operated continuously for at least decade. We analyze recently reprocessed data set is based on adjustments inconsistencies caused by varying...
Abstract Reprocessed ozonesonde data from eight SHADOZ (Southern Hemisphere ADditional OZonesondes) sites have been used to derive the first analysis of uncertainty estimates for both profile and total column ozone (TCO). The is a composite uncertainties individual terms in partial pressure ( P O3 ) equation, those being sensor current, background internal pump temperature, efficiency factors, conversion efficiency, flow rate. Overall, (Δ are within 15% peak around tropopause (15 ± 3 km)...
Abstract We review the current state of knowledge ozonesonde uncertainty and bias, with reference to recent developments in laboratory field experiments. In past 20 years precision has improved by a factor 2, primarily through adoption strict standard operating procedures. The budget for ozone partial pressure reading contributions from stoichiometry, cell background current, pump efficiency temperature, sensing solution type, volume. Corrections historical data known issues may reduce...
Abstract An international effort to improve ozonesonde data quality and reevaluate historical records has made significant improvements in the accuracy of global network data. However, between 2014 2016, total column ozone (TCO; O 3 ) at 14 37 regularly reporting stations exhibited a sudden dropoff relative satellite measurements. The TCO drop is 3–7% compared ground‐based TCO, 5–10% or more stratospheric profiles, compromising use recent for trends, although they remain reliable other uses....
Abstract The ozonesonde is a small balloon-borne instrument that attached to standard radiosonde measure profiles of ozone from the surface 35 km with ∼100-m vertical resolution. Ozonesonde data constitute mainstay satellite calibration and are used for climatologies analysis trends, especially in lower stratosphere where satellites most uncertain. electrochemical concentration cell (ECC) has been deployed at ∼100 stations worldwide since 1960s, changes over time manufacture procedures,...
This study quantifies the association between COVID-19 economic downturn and 2020 tropospheric ozone anomalies above Europe western North America, their impact on long-term trends. Anomaly detection for an atmospheric time series is usually carried out by identifying potentially aberrant data points relative to climatological values. However, detecting from sparsely sampled ozonesonde profiles (once per week at most sites) challenging due ozone's high temporal variability. We first...
Abstract. This study presents an updated evaluation of stratospheric ozone profile trends in the 60∘ S–60∘ N latitude range over 2000–2020 period using version Long-term Ozone Trends and Uncertainties Stratosphere (LOTUS) regression model that was used to evaluate such up 2016 for last WMO Assessment (2018). In addition derivation detailed as a function vertical coordinates, regressions are performed with datasets averaged broad bands, i.e. 60–35∘ S, 20∘ S–20∘ 35–60∘ N. The same methodology...
Abstract The recent Assessment of Standard Operating Procedures for Ozonesondes 2.0 (WMO/GAW Report #268) addressed questions homogeneity and long‐term stability in global electrochemical concentration cell (ECC) ozone sounding network time series. Among its recommendations was adoption a standard evaluating data quality ozonesonde Total column (TCO) derived from the sondes compared to TCO Aura's Ozone Monitoring Instrument (OMI) is primary indicator. Comparisons sonde with Microwave Limb...
We estimate the tropospheric column ozone using a forward trajectory model to increase horizontal resolution of Aura Microwave Limb Sounder (MLS) derived stratospheric ozone. Subtracting MLS from Ozone Monitoring Instrument total measurements gives enhanced residual (TTOR). Because different tropopause definitions, we validate basic technique by computing 200‐hPa‐to‐surface and comparing it same product ozonesondes Tropospheric Emission Spectrometer measurements. Comparisons show good...
We present a regional and seasonal climatology of SHADOZ ozone profiles in the troposphere tropical tropopause layer (TTL) based on measurements taken during first five years Aura, 2005–2009, when new stations joined network at Hanoi, Vietnam; Hilo, Hawaii; Alajuela/Heredia, Costa Rica; Cotonou, Benin. In all, 15 operated that period. A west‐to‐east progression decreasing convective influence increasing pollution leads to distinct tropospheric three regions: (1) western Pacific/eastern...
Abstract. We validate the Ozone Monitoring Instrument (OMI) Profile (PROFOZ) product from October 2004 through December 2014 retrieved by Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. also evaluate effects of OMI row anomaly (RA) on retrieval dividing dataset into before and after occurrence serious RA, i.e., pre-RA (2004–2008) post-RA (2009–2014). The shows good agreement with ozonesondes in tropics midlatitudes for pressure < ∼ 50 hPa high...
Abstract The lifetime of ozone in the troposphere is approximately 3 weeks. Prevailing westerly winds at northern midlatitudes can transport air around globe that time. Hence, within these latitudes zonal similarity expected long‐term changes and seasonal cycles concentrations baseline ozone. We quantify degree by examining eight situ data sets near west coasts North America Europe, is, upwind those continents downwind Pacific Atlantic Oceans, where impacts local regional sources have been...
Retrievals from the Microwave Limb Sounder (MLS) and Ozone Monitoring Instrument (OMI) on EOS‐Aura were included in Goddard Earth Observing System version 4 (GEOS‐4) ozone data assimilation system. The distribution daily to seasonal evolution of stratosphere troposphere during 2005 are investigated. In lower stratosphere, where dynamical processes dominate, comparisons with independent ozonesonde Measurement Water Vapour by Airbus In‐Service Aircraft (MOZAIC) indicate mean agreement within...
Abstract. This paper presents a first statistical validation of tropospheric ozone products derived from measurements the IASI satellite instrument. Since end 2006, (Infrared Atmospheric Sounding Interferometer) aboard polar orbiter Metop-A measures infrared spectra Earth's atmosphere in nadir geometry. covers northern mid-latitudes and period July 2007 to August 2008. Retrieval results four different sources are presented: three scientific (LATMOS, LISA, LPMAA) fourth one is pre-operational...
Abstract. A multi-model study of the long-range transport ozone and its precursors from major anthropogenic source regions was coordinated by Task Force on Hemispheric Transport Air Pollution (TF HTAP) under Convention Long-range Transboundary (LRTAP). Vertical profiles at 12-h intervals 2001 are available twelve models contributing to this compared here with observed ozonesondes. The contributions each region analysed for selected sondes, analysis is supplemented retroplume calculations...