D. A. Degenstein
A5069577223- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Atmospheric aerosols and clouds
- Calibration and Measurement Techniques
- Air Quality Monitoring and Forecasting
- Solar and Space Plasma Dynamics
- Spectroscopy and Laser Applications
- Climate variability and models
- Astro and Planetary Science
- Optical Imaging and Spectroscopy Techniques
- Vehicle emissions and performance
- Geophysics and Gravity Measurements
- Planetary Science and Exploration
- Meteorological Phenomena and Simulations
- Water Quality Monitoring and Analysis
- Cryospheric studies and observations
- Methane Hydrates and Related Phenomena
- Arctic and Antarctic ice dynamics
- Aerospace Engineering and Energy Systems
- Air Quality and Health Impacts
- Gas Dynamics and Kinetic Theory
- Solar Radiation and Photovoltaics
- Geochemistry and Geologic Mapping
University of Saskatchewan
2016-2025
National Institute of Meteorology
2015
York University
2009-2011
National Research Council Canada
2010
Odin is a 250 kg class satellite built in co-operation between Sweden, Canada, France, and Finland launched February 2001. It carries two instruments: 4-band sub-millimetre radiometer used for both astronomy atmospheric science an optical spectrometer infrared imaging system purely observations. As part of the joint mission will observe limb 50% observation time producing profiles many species interest middle atmosphere with vertical resolution 12 km. These include, among others, ozone,...
The optical spectrograph and infrared imager system (OSIRIS) on board the Odin spacecraft is designed to retrieve altitude profiles of terrestrial atmospheric minor species by observing limb-radiance profiles. grating (OS) obtains spectra scattered sunlight over range 280800 nm with a spectral resolution approximately 1 nm. performs repetitive vertical limb scan sweep OS km field view selected ranges from 10 100 km. absorption features that are superimposed solar spectrum monitored derive...
[1] The variability of stratospheric aerosol loading between 1985 and 2010 is explored with measurements from SAGE II, CALIPSO, GOMOS/ENVISAT, OSIRIS/Odin space-based instruments. We find that, following the 1991 eruption Mount Pinatubo, levels increased by as much two orders magnitude only reached "background levels" 1998 2002. From 2002 onwards, a systematic increase has been reported number investigators. Recently, trend, based on ground-based lidar measurements, tentatively attributed to...
TROPOMI, on-board the Sentinel-5 Precursor satellite is a nadir-viewing spectrometer measuring reflected sunlight in ultraviolet, visible, near-infrared, and shortwave infrared spectral range. From these spectra several important air quality climate-related atmospheric constituents are retrieved at an unprecedented high spatial resolution, including nitrogen dioxide (NO2). We present first retrievals of TROPOMI NO2 over Canadian Oil Sands, contrasting them with observations from OMI...
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. Ozone profile trends over the period 2000 to 2016 from several merged satellite ozone data sets and ground-based measured by four techniques at stations of Network for Detection Atmospheric Composition Change indicate significant increases in upper stratosphere, between 35 48 km altitude (5 1 hPa). Near 2 hPa (42 km), has been increasing about 1.5 % per decade tropics (20° S 20° N), 2.5 60° latitude bands both hemispheres. At levels below hPa), are smaller not statistically...
SignificanceLarge wildfires have been observed to inject smoke into the stratosphere, raising questions about their potential affect stratospheric ozone layer that protects life on Earth from biologically damaging ultraviolet radiation. Multiple observations of aerosol and NO2 concentrations three independent satellite instruments are used here together with model calculations identify decreases in following major Australian 2019 through 2020 wildfires. The data confirm important chemistry...
In June 2009 the Sarychev volcano located in Kuril Islands to northeast of Japan erupted explosively, injecting ash and an estimated 1.2 ± 0.2 Tg sulfur dioxide into upper troposphere lower stratosphere, making it arguably one 10 largest stratospheric injections last 50 years. During period immediately after eruption, we show that (SO 2 ) cloud was clearly detected by retrievals developed for Infrared Atmospheric Sounding Interferometer (IASI) satellite instrument resultant sulfate aerosol...
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. This paper presents extensive {bias determination} analyses of ozone observations from the Atmospheric Chemistry Experiment (ACE) satellite instruments: ACE Fourier Transform Spectrometer (ACE-FTS) and Measurement Aerosol Extinction in Stratosphere Troposphere Retrieved by Occultation (ACE-MAESTRO) instrument. Here we compare latest data products ACE-FTS ACE-MAESTRO with coincident nearly 20 satellite-borne, airborne, balloon-borne ground-based instruments, analysing volume mixing...
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 Optical Spectrograph and InfraRed Imaging System (OSIRIS) on board the Odin satellite has been used to provide vertically resolved aerosol extinction since 2001. OSIRIS version 5.07 product in numerous studies now provides a 17‐year record of global stratospheric aerosol. This work presents new 7 retrieval. A multiwavelength algorithm developed reduce measurement geometry biases improve retrieval upper troposphere lower stratosphere. Chen et al. (2016,...
The cover shows a cropped image of the warming stripes (seen in full below), as developed by Ed Hawkins (Reading University, UK).Each vertical line global average temperature whole year, starting at 1850 on far left and ending with 2019 right.The underlying data are from HadCRUT4.6dataset UK Met Office Hadley Centre.To create other regions countries visit https://showyourstripes.
Abstract The Stratospheric Aerosol and Gas Experiment III on the International Space Station (SAGE III/ISS) was launched 19 February 2017 began routine operation in June 2017. first 2 years of SAGE III/ISS (v5.1) solar occultation ozone data were evaluated by using correlative satellite ground‐based measurements. Among three (MES, AO3, MLR) retrieved products, AO3 shows smallest bias best precision, with mean biases less than 5% for altitudes ~15–55 km midlatitudes ~20–55 tropics. In lower...
Abstract. After decades of depletion in the 20th century, near-global ozone now shows clear signs recovery upper stratosphere. The column, however, has remained largely constant since turn mainly due to evolution lower stratospheric ozone. In tropical stratosphere, is expected decrease as a consequence enhanced upwelling driven by increasing greenhouse gas concentrations, and this consistent with observations. There recent evidence, that mid-latitude continues well, contrary model...
Caption: Lightning discharges appear in various colours depending on the scatter of light inside thundercloud and atmosphere.The intracloud lightning centre to be white with a bluish tint, cloud-to-ground discharge below appears orange.The right hand side exhibits green tint that is attributed unique composition hydrometeors thundercloud.The photo was taken late evening 10 September 2013, near Tarragona northeastern Spain.
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 2022 eruption of the Hunga Tonga‐Hunga Ha'apai volcano caused substantial impacts on atmosphere, including a massive injection water vapor, and largest increase in stratospheric aerosol for 30 years. Ozone Mapping Profiler Suite (OMPS) Limb instrument has been critical monitoring amount spread volcanic stratosphere. We show that rapid imagery from OMPS enables tomographic retrieval extinction reduces bias up to factor two, improves vertical structure agreement with coincident...
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An algorithm for the retrieval of global stratospheric aerosol profiles is presented using optical spectrograph and infrared imaging system limb scatter measurements as an example data set. The utilizes a one‐dimensional version MART nonlinear relaxation inversion suitable scatter. A height profile particle size distribution must be assumed in order to retrieve number density. altitude normalized wavelength ratio measurement vector employed minimize effects upwelling radiation from ground...
In September 2002 the Antarctic polar vortex split in two under influence of a sudden warming. During this event, Odin satellite was able to measure both ozone (O 3 ) and chlorine monoxide (ClO), key constituent responsible for so‐called “ozone hole”, together with nitrous oxide (N 2 O), dynamical tracer, nitric acid (HNO nitrogen dioxide (NO ), tracers denitrification. The submillimeter radiometer (SMR) microwave instrument Optical Spectrograph Infrared Imager System (OSIRIS) UV‐visible...
Abstract. The OSIRIS instrument onboard the Odin spacecraft routinely measures vertical profiles of spectrally dispersed, limb scattered sunlight from upper troposphere into lower mesosphere. These measurements are used to retrieve ozone number density profile using SaskMART Multiplicative Algebraic Reconstruction Technique, which is a one dimensional modification an existing two-dimensional tomographic retrieval algorithm. retrieved extends cloud top 60 km. In absence clouds down 10 This...