A5066054979- Atmospheric Ozone and Climate
- Atmospheric and Environmental Gas Dynamics
- Atmospheric chemistry and aerosols
- Ionosphere and magnetosphere dynamics
- Air Quality Monitoring and Forecasting
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Methane Hydrates and Related Phenomena
- Air Quality and Health Impacts
- Meteorological Phenomena and Simulations
- Climate variability and models
- Markov Chains and Monte Carlo Methods
- Hydrocarbon exploration and reservoir analysis
- Astro and Planetary Science
- Scientific Research and Discoveries
- Cryospheric studies and observations
- Vehicle emissions and performance
- Climate change and permafrost
- Geochemistry and Geologic Mapping
- Climate Change Policy and Economics
- Planetary Science and Exploration
- Maritime Transport Emissions and Efficiency
- COVID-19 impact on air quality
Finnish Meteorological Institute
2016-2025
Tallinn University of Technology
2016
Aalto University
2016
Finnish Geospatial Research Institute
2004
PerkinElmer (Finland)
2004
A proper choice of a proposal distribution for Markov chain Monte Carlo methods, example the Metropolis-Hastings algorithm, is well known to be crucial factor convergence algorithm. In this paper we introduce an adaptive Metropolis (AM) where Gaussian updated along process using full information cumulated so far. Due nature process, AM algorithm non-Markovian, but establish here that it has correct ergodic properties. We also include results our numerical tests, which indicate competes with...
The Ozone Monitoring Instrument (OMI) flies on NASA's Earth Observing System AURA satellite, launched in July 2004. OMI is an ultraviolet/visible (UV/VIS) nadir solar backscatter spectrometer, which provides nearly global coverage one day, with a spatial resolution of 13 km/spl times/24 km. Trace gases measured include O/sub 3/, NO/sub 2/, SO/sub HCHO, BrO, and OClO. In addition measures aerosol characteristics, cloud top heights coverage, UV irradiance at the surface. OMI's unique...
Abstract. This overview paper highlights the successes of Ozone Monitoring Instrument (OMI) on board Aura satellite spanning a period nearly 14 years. Data from OMI has been used in wide range applications and research resulting many new findings. Due to its unprecedented spatial resolution, combination with daily global coverage, plays unique role measuring trace gases important for ozone layer, air quality, climate change. With operational very fast delivery (VFD; direct readout) near...
NASA's Orbiting Carbon Observatory-2 (OCO-2) mission was motivated by the need to diagnose how increasing concentration of atmospheric carbon dioxide (CO
Abstract Anthropogenic CO 2 emissions from fossil fuel combustion have large impacts on climate. In order to monitor the increasing concentrations in atmosphere, accurate spaceborne observations—as available Orbiting Carbon Observatory‐2 (OCO‐2)—are needed. This work provides first direct observation of anthropogenic OCO‐2 over main pollution regions: eastern USA, central Europe, and East Asia. is achieved by deseasonalizing detrending observations derive anomalies. Several small isolated...
Abstract Under the Paris Agreement (PA), progress of emission reduction efforts is tracked on basis regular updates to national greenhouse gas (GHG) inventories, referred as bottom-up estimates. However, only top-down atmospheric measurements can provide observation-based evidence trends. Today, there no internationally agreed, operational capacity monitor anthropogenic GHG trends using complement inventories. The European Commission (EC), Space Agency, Centre for Medium-Range Weather...
Abstract. The largest anthropogenic emissions of carbon dioxide (CO2) come from local sources, such as cities and power plants. upcoming Copernicus CO2 Monitoring (CO2M) mission will provide satellite images the NO2 plumes associated with these sources at a resolution 2 km × swath 250 km. These could be exploited using atmospheric-plume inversion methods to estimate time overpass their corresponding uncertainties. To support development operational processing imagery column-averaged dry-air...
The Dutch‐Finnish Ozone Monitoring Instrument (OMI) on board the NASA EOS Aura spacecraft is a nadir viewing spectrometer that measures solar reflected and backscattered light in selected range of ultraviolet visible spectrum. instrument has 2600 km wide swath it capable daily, global contiguous mapping. Finnish Meteorological Institute Goddard Space Flight Center have developed surface irradiance algorithm for OMI produces noontime spectral UV estimates at four wavelengths, erythemal dose...
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. We have studied data from two satellite occultation instruments in order to generate a high vertical resolution homogeneous ozone time series of 26 yr. The Stratospheric Aerosol and Gas Experiment (SAGE) II solar instrument the Global Ozone Monitoring by Occultation Stars (GOMOS) measured profiles stratosphere mesosphere 1984–2005 2002–2012, respectively. coverage, good resolution, self-calibrating measurement method make these valuable for detection changes distribution over time....
Abstract Observations taken over the last few decades indicate that dramatic changes are occurring in Arctic‐Boreal Zone (ABZ), which having significant impacts on ABZ inhabitants, infrastructure, flora and fauna, economies. While suitable for detecting overall change, current capability is inadequate systematic monitoring improving process‐based large‐scale understanding of integrated components ABZ, includes cryosphere, biosphere, hydrosphere, atmosphere. Such knowledge will lead to...
Abstract. GOMOS on ENVISAT (launched in February, 2002) is the first space instrument dedicated to study of atmosphere Earth by technique stellar occultations (Global Ozone Monitoring Occultation Stars). Its polar orbit makes good latitude coverage possible. Because it self-calibrating, particularly well adapted long time trend monitoring stratospheric species. With 4 spectrometers, wavelength 248 nm 942 enables ozone, H2O, NO2, NO3, air density, aerosol extinction, and O2. Two additional...
We report GOMOS nighttime observations of middle atmosphere NO 2 and O 3 profiles during eight recent polar winters in the Arctic Antarctic. The measurements are used to study effects energetic particle precipitation further downward transport x . During seven observed enhancements occur good correlation with levels enhanced high‐energy and/or geomagnetic activity as indicated by A p index. find a nearly linear relationship between average winter time index upper stratospheric column density...
Abstract. The Global Ozone Monitoring by Occultation of Stars (GOMOS) instrument on board the European Space Agency's ENVISAT satellite measures attenuation stellar light in occultation geometry. Daytime measurements also record scattered solar from atmosphere. wavelength regions are ultraviolet-visible band 248–690 nm and two infrared bands at 755–774 926–954 nm. From UV-Visible IR spectra vertical profiles O3, NO2, NO3, H2O, O2 aerosols can be retrieved. In addition there 1 kHz photometers...
The emergence of Markov chain Monte Carlo (MCMC) methods has opened a way for Bayesian analysis complex models. Running MCMC samplers typically requires thousands model evaluations, which can exceed available computer resources when this evaluation is computationally intensive. We will discuss two generally applicable techniques to improve the efficiency MCMC. First, we consider parallel version adaptive algorithm Haario et al. (2001), implementing idea inter-chain adaptation introduced by...
Abstract. Peak stratospheric chlorofluorocarbon (CFC) and other ozone depleting substance (ODS) concentrations were reached in the mid- to late 1990s. Detection attribution of expected recovery layer an atmosphere with reduced ODSs as well efforts understand evolution presence increasing greenhouse gases are key current research topics. These require a critical examination changes accurate knowledge spatial (geographical vertical) temporal response. For such examination, it is vital that...
Abstract. In this paper, we present a merged dataset of ozone profiles from several satellite instruments: SAGE II on ERBS, GOMOS, SCIAMACHY and MIPAS Envisat, OSIRIS Odin, ACE-FTS SCISAT, OMPS Suomi-NPP. The is created in the framework European Space Agency Climate Change Initiative (Ozone_cci) with aim analyzing stratospheric trends. For dataset, used latest versions original datasets. datasets individual instruments have been extensively validated intercompared; only those which are good...
Abstract. The three Global Ozone Monitoring Experiment-2 instruments will provide unique and long data sets for atmospheric research applications. complete time period be 2007–2022, including the of ozone depletion as well beginning layer recovery. Besides chemistry, GOME-2 (Global Experiment-2) products are important e.g. air quality studies, climate modelling, policy monitoring hazard warnings. heritage is in ERS/GOME Envisat/SCIAMACHY instruments. current Level 2 (L2) cover a wide range...
Since the Paris Agreement was adopted in 2015, role of space-based observations for monitoring anthropogenic greenhouse gas (GHG) emissions has increased. To meet requirements carbon dioxide (CO 2 ) emissions, European Copernicus programme is preparing a dedicated CO Monitoring (CO2M) satellite constellation that will provide and nitrogen (NO at 4 km resolution along 250 wide swath. In this paper, we adapt recently developed divergence method to derive both oxide x cities power plants from...