Pauli Heikkinen
A5102817614- Atmospheric and Environmental Gas Dynamics
- Atmospheric Ozone and Climate
- Atmospheric chemistry and aerosols
- Spectroscopy and Laser Applications
- Geochemistry and Geologic Mapping
- Methane Hydrates and Related Phenomena
- Remote Sensing in Agriculture
- Hydrocarbon exploration and reservoir analysis
- Meteorological Phenomena and Simulations
- Calibration and Measurement Techniques
- Carbon Dioxide Capture Technologies
- Land Use and Ecosystem Services
- Climate variability and models
- Marine and coastal ecosystems
- Atmospheric aerosols and clouds
- Nuclear Physics and Applications
- Pesticide Exposure and Toxicity
- Cryospheric studies and observations
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Contact Dermatitis and Allergies
- Environmental Policies and Emissions
- Remote Sensing and LiDAR Applications
- Impact of Light on Environment and Health
- Air Quality Monitoring and Forecasting
Finnish Meteorological Institute
2016-2025
Aker Arctic (Finland)
2012
Institute of Seismology
2010
Abstract. NASA's Orbiting Carbon Observatory-2 (OCO-2) has been measuring carbon dioxide column-averaged dry-air mole fraction, XCO2, in the Earth's atmosphere for over 2 years. In this paper, we describe comparisons between first major release of OCO-2 retrieval algorithm (B7r) and XCO2 from OCO-2's primary ground-based validation network: Total Column Observing Network (TCCON). The retrievals, after filtering bias correction, agree well when aggregated around coincident with TCCON data...
Abstract. The column-averaged dry-air mole fractions of carbon dioxide and methane (XCO2 XCH4) have been retrieved from Greenhouse gases Observing SATellite (GOSAT) Short-Wavelength InfraRed (SWIR) observations released as a SWIR L2 product the National Institute for Environmental Studies (NIES). XCO2 XCH4 using version 01.xx retrieval algorithm showed large negative biases standard deviations (−8.85 4.75 ppm −20.4 18.9 ppb XCH4, respectively) compared with data Total Carbon Column Network...
Abstract. We describe a method of evaluating systematic errors in measurements total column dry-air mole fractions CO2 (XCO2) from space, and we illustrate the by applying it to v2.8 Atmospheric Observations Space retrievals Greenhouse Gases Observing Satellite (ACOS-GOSAT) over land. The approach exploits lack large gradients XCO2 south 25° S identify large-scale offsets other biases ACOS-GOSAT data with several retrieval parameters instrument calibration. demonstrate effectiveness...
Abstract. The Sentinel-5 Precursor (S5P) mission with the TROPOspheric Monitoring Instrument (TROPOMI) on board has been measuring solar radiation backscattered by Earth's atmosphere and surface since its launch 13 October 2017. In this paper, we present for first time S5P operational methane (CH4) carbon monoxide (CO) products' validation results covering a period of about 3 years using global Total Carbon Column Observing Network (TCCON) Infrared Working Group Detection Atmospheric...
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs) beginning in 2004 from over 30 current or past measurement sites around the world, using solar absorption spectroscopy near infrared region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions as well to validate improve observations made spacebased sensors. Here, we describe an update...
Abstract. The Total Carbon Column Observing Network (TCCON) measures column-average mole fractions of several greenhouse gases (GHGs), beginning in 2004, from over 30 current or past measurement sites around the world using solar absorption spectroscopy near-infrared (near-IR) region. TCCON GHG data have been used extensively for multiple purposes, including studies carbon cycle and anthropogenic emissions, as well to validate improve observations space-based sensors. Here, we describe an...
Abstract. We have examined the utility of retrieved column-averaged, dry-air mole fractions CO2 (XCO2) from Greenhouse Gases Observing Satellite (GOSAT) for quantifying monthly, regional flux estimates CO2, using GEOS-Chem four-dimensional variational (4D-Var) data assimilation system. focused on assessing potential impact biases in GOSAT estimates. Using different screening and bias correction approaches, we selected three subsets XCO2 4D-Var inversion analyses, found that inferred global...
This report describes a validation study of Greenhouse gases Observing Satellite (GOSAT) data processing using ground‐based measurements the Total Carbon Column Network (TCCON) as reference for column‐averaged dry air mole fractions atmospheric carbon dioxide (X CO2 ). We applied photon path length probability density function method to validate X retrievals from GOSAT obtained during 22 months starting June 2009. permitted direct evaluation optical modifications due light scattering that...
Abstract. The Total Carbon Column Observing Network (TCCON) is the baseline ground-based network of instruments that record solar absorption spectra from which accurate and precise column-averaged dry-air mole fractions CO2 (XCO2), CH4 (XCH4), CO (XCO), other gases are retrieved. TCCON data have been widely used for carbon cycle science validation satellites measuring greenhouse gas concentrations globally. number stations in (currently about 25) limited has a very uneven geographical...
Abstract. Seasonal CO2 exchange in the boreal forest plays an important role global carbon budget and driving interannual variability seasonal cycles of atmospheric CO2. Satellite-based observations from polar orbiting satellites like Orbiting Carbon Observatory-2 (OCO-2) offer opportunity to characterize across longitudes with a spatially temporally rich data set, but quality controls biases still require vetting at high latitudes. With objective improving availability northern, terrestrial...
Abstract. Knowledge of surface pressure is essential for calculating column-averaged dry-air mole fractions trace gases, such as CO2 (XCO2). In the NASA Orbiting Carbon Observatory 2 (OCO-2) Atmospheric Observations from Space (ACOS) retrieval algorithm, retrieved pressures have been found to unacceptable errors, warranting a parametric bias correction. This correction depends on difference between and priori pressures, which are derived meteorological model that hypsometrically adjusted...
Abstract. Fourier transform spectrometer (FTS) observations at Sodankylä, Finland (67.4° N, 26.6° E) have been performed since early 2009. The FTS instrument is participating in the Total Carbon Column Observing Network (TCCON) and has optimized to measure abundances of key greenhouse gases atmosphere. Sodankylä only TCCON station Fennoscandia region. Here we report measured CO2 time series over a 7-year period (2009–2015) provide description system data processing Sodankylä. We find lowest...
Abstract. We compare the atmospheric column-averaged dry-air mole fractions of carbon dioxide (XCO2) and methane (XCH4) measured with a pair COllaborative Carbon Column Observing Network (COCCON) spectrometers at Kiruna Sodankylä (boreal areas). model data provided by Copernicus Atmosphere Monitoring Service (CAMS) between 2017 2019 XCH4 from recently launched Sentinel-5 Precursor (S5P) satellite 2018 2019. In addition, modeled gradients XCO2 (ΔXCO2 ΔXCH4) on regional scales are...
Abstract. Within the NDACC (Network for Detection of Atmospheric Composition Change), more than 20 FTIR (Fourier-transform infrared) spectrometers, spread worldwide, provide long-term data records many atmospheric trace gases. We present a method that uses measured and modelled XCO2 assessing consistency these records. Our retrieval setup is kept simple so it can easily be adopted any NDACC/FTIR-like measurement made since late 1950s. By comparison to coincident TCCON (Total Carbon Column...
This report is the second in a series of companion papers describing effects atmospheric light scattering observations carbon dioxide (CO 2 ) by Greenhouse gases Observing SATellite (GOSAT), orbit since 23 January 2009. Here we summarize retrievals from six previously published algorithms; retrieving column‐averaged dry air mole fractions CO (X CO2 during 22 months operation GOSAT June First, compare data products each algorithm with ground‐based remote sensing Total Carbon Column Network...
Abstract. Although optical components in Fourier transform infrared (FTIR) spectrometers are preferably wedged, practice, spectra typically suffer from the effects of resonances (“channeling”) affecting retrieval weakly absorbing gases. This study investigates level channeling each FTIR spectrometer within Network for Detection Atmospheric Composition Change (NDACC). Dedicated were recorded by more than 20 NDACC using a laboratory mid-infrared source and two detectors. In indium antimonide...
Abstract. The TCCON (Total Carbon Column Observing Network) FTIR (Fourier transform infrared) network provides highly accurate observations of greenhouse gas column-averaged dry-air mole fractions. As an important component quality assurance, sealed cells filled with approximately 5 mbar HCl are used for instrumental line shape (ILS) monitoring at all sites. Here, we introduce a calibration procedure the which employs refillable, pressure-monitored reference cell C2H2. Using this method,...
Abstract. We present new observations of trace gases in the stratosphere based on a cost-effective sampling technique that can access much higher altitudes than aircraft. The further development this method now provides detection species with abundances parts per trillion (ppt) range and below. obtain mixing ratios for six (CFC-11, CFC-12, HCFC-22, H-1211, H-1301, SF6), all which are important understanding stratospheric ozone depletion circulation. After demonstrating quality data through...
There is fine-scale spatial heterogeneity in key vegetation properties including leaf-area index (LAI) and biomass treeless northern peatlands, hyperspectral drone data with high spectral resolution could detect the patterns accuracy. However, advantage of has not been tested a multi-source remote sensing approach (i.e. inclusion multiple different datatypes); overall, sub-meter-level maps have largely absent. We evaluated detectability LAI at boreal fen (Halssiaapa) Finland multi-temporal...
The COllaborative Carbon Column Observing Network has become a reliable source of high-quality ground-based remote sensing network data that provide column-averaged dry-air mole fractions carbon dioxide (XCO2), methane (XCH4), and monoxide (XCO). fiducial reference measurements these gases from the COCCON complement TCCON NDACC-IRWG data. This study shows application for validation existing greenhouse gas satellite products. includes XCH4 XCO products European Copernicus Sentinel-5 Precursor...
Understanding the atmospheric distribution of water (H 2 O) is crucial for global warming studies and climate change mitigation. In this context, reliable satellite data are extremely valuable their continuous coverage, once quality has been assessed. Short-wavelength infrared spectra acquired by Thermal And Near-infrared Sensor carbon Observation-Fourier Transform Spectrometer (TANSO-FTS) aboard Greenhouse gases Observing Satellite (GOSAT). From these, column-averaged dry-air mole fractions...
The Arctic and boreal regions are experiencing a rapid increase in temperature, resulting changing cryosphere, increasing human activity, potentially high-latitude methane emissions. Satellite observations from Sentinel-5P TROPOMI provide an unprecedented coverage of column-averaged dry-air mole fraction (XCH4) the Arctic, compared to previous missions or situ measurements. purpose this study is support enhance data used for research through presenting systematic evaluation products derived...
Abstract. Column-averaged dry-air mole fraction of CO (XCO) measurements are obtained from two ground-based Fourier transform infrared (FTIR) spectrometer networks: the Total Carbon Column Observing Network (TCCON) and for Detection Atmospheric Composition Change (NDACC). In this study, differences between TCCON NDACC XCO investigated discussed based on six NDACC–TCCON sites using data over period 2007–2017. A direct comparison shows that about 5.5 % larger than at Ny-Ålesund, Bremen, Izaña...
Abstract. We characterize the magnitude of seasonally and spatially varying biases in National Aeronautics Space Administration (NASA) Orbiting Carbon Observatory-2 (OCO-2) Version 8 (v8) Atmospheric CO2 Observations from (ACOS) Greenhouse Gas Observing SATellite (GOSAT) version 7.3 (v7.3) satellite retrievals by comparisons to measurements collected Total Column Network (TCCON), Tomography (ATom) experiment, Oceanic (NOAA) Earth System Research Laboratory (ESRL) U. S. Department Energy...