Pauli Heikkinen

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We describe a method of evaluating systematic errors in measurements of total column dry-air mole fractions of CO2 (XCO2 ) from space, and we illustrate the method by applying it to the v2.8 Atmospheric CO2 Observations from Space retrievals of the Greenhouse Gases Observing Satellite (ACOS-GOSAT) measurements over land. The approach exploits the lack of(More)
For several applications, spaceborne microwave measurements are used to get large scale information of snowcovered terrain. Emission models for soil, vegetation and snow are needed in extraction of snow parameters from satellite measurements. In this paper space-observed brightness temperature of snow-covered terrain is simulated from in situ measurements(More)
Understanding the atmospheric distribution of water (H2O) is crucial for global warming studies and climate change mitigation. In this context, reliable satellite data are extremely valuable for their global and continuous coverage, once their quality has been assessed. Short-wavelength infrared spectra are acquired by the Thermal And Near-infrared Sensor(More)
Star occultation remote sensing used in GOMOS and ozone sondes are unique tools for obtaining high resolution ozone profiles from the ground to the upper mesosphere (100 km) in the polar winter. Quality controlled profiles of the GOMOS and Arctic ozone soundings were used to form a height resolved ozone climatology for the polar winter atmosphere. As a(More)
A preliminary project for the realisation of the kilogram using the “superconducting magnetic levitation method” has been started at MIKES. The work will be carried out in cooperation with VNIIM, Russia. In the levitation method there are still problems, which have to be solved before the final goal, a relative uncertainty of 10 -8 for the kilogram, can be(More)
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 of TCCON quality assurance, sealed cells filled with approximately 5 mbar of HCl are used for instrumental line shape (ILS) monitoring at all(More)
Eric Dupuy 1,*, Isamu Morino 1, Nicholas M. Deutscher 2,3, Yukio Yoshida 1, Osamu Uchino 1, Brian J. Connor 4, Martine De Mazière 5, David W. T. Griffith 2, Frank Hase 6, Pauli Heikkinen 7, Patrick W. Hillyard 8,9, Laura T. Iraci 8, Shuji Kawakami 10, Rigel Kivi 7, Tsuneo Matsunaga 1, Justus Notholt 3, Christof Petri 3, James R. Podolske 8, David F. Pollard(More)
We present a comparison of an atmospheric general circulation model (AGCM)-based chemistry-transport model (ACTM) simulation with total column measurements of CO2, CH4 and N2O from the Total Carbon Column Observing Network (TCCON). The model is able to capture observed trends, seasonal cycles and inter hemispheric gradients at most sampled locations for all(More)
To minimize the dose applied to the specimens during imaging in a MeV ion microbeam we have investigated new concepts that allow collection of images with multi-resolution support. To test the concept, a set of reference PIXE microbeam images with well-characterised noise were segmented using both a direct down-sampling technique and wavelet decomposition.(More)