Search Results - "Gröbner, Julian"

The Precision Solar Spectroradiometer (PSR) for direct solar irradiance measurements by Gröbner, Julian, Kouremeti, Natalia

“…•A new Precision Solar Spectroradiometer.•Retrieval of aerosol optical depth and Integrated water vapour.•Comprehensive uncertainty budget for solar…”
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Development and operation of the Hemispherical Blackbody (HSBB) for the calibration of infrared radiometers with a hemispherical acceptance angle by Feierabend, Moritz, Reiniger, Max, Bories, Jonas, Adibekyan, Albert, Häfner, Robert, Müller, Chantal, Fehse, Dirk, Gröbner, Julian, Müller, Ingmar, Monte, Christian

“…Longwave downward radiation measurements are fundamental for investigating the surface and atmospheric energy budget of the Earth. Such measurements are…”
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Monitoring aerosol optical depth during the Arctic night: Instrument development and first results by Mazzola, Mauro, Stone, Robert S., Kouremeti, Natalia, Vitale, Vito, Gröbner, Julian, Stebel, Kerstin, Hansen, Georg H., Stone, Thomas C., Ritter, Christoph, Pulimeno, Simone

“…Moon-photometric measurements were made at two locations in the Arctic during winter nights using two different modified Sun photometers; a Carter Scott SP02…”
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Cloud observations in Switzerland using hemispherical sky cameras by Wacker, Stefan, Gröbner, Julian, Zysset, Christoph, Diener, Laurin, Tzoumanikas, Panagiotis, Kazantzidis, Andreas, Vuilleumier, Laurent, Stöckli, Reto, Nyeki, Stephan, Kämpfer, Niklaus

“…We present observations of total cloud cover and cloud type classification results from a sky camera network comprising four stations in Switzerland. In a…”
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Cloud fraction determined by thermal infrared and visible all-sky cameras by Aebi, Christine, Grobner, Julian, Kampfer, Niklaus

“…The thermal infrared cloud camera (IRCCAM) is a prototype instrument that determines cloud fraction continuously during daytime and night-time using…”
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Consistency of total column ozone measurements between the Brewer and Dobson spectroradiometers of the LKO Arosa and PMOD/WRC Davos by Gröbner, Julian, Schill, Herbert, Egli, Luca, Stübi, René

“…Total column ozone measured by Brewer and Dobson spectroradiometers at Arosa and Davos, Switzerland, have systematic seasonal variations of around 1.5 % using…”
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Total column ozone retrieval from a novel array spectroradiometer by Egli, Luca, Gröbner, Julian, Schill, Herbert, Maillard Barras, Eliane

“…This study presents a new total column ozone (TCO) retrieval from the Koherent system, developed at the Physikalisch-Meteorologisches Observatorium Davos,…”
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Cloud radiative effect, cloud fraction and cloud type at two stations in Switzerland using hemispherical sky cameras by Aebi, Christine, Gröbner, Julian, Kämpfer, Niklaus, Vuilleumier, Laurent

“…The current study analyses the cloud radiative effect during the daytime depending on cloud fraction and cloud type at two stations in Switzerland over a time…”
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Traceable total ozone column retrievals from direct solar spectral irradiance measurements in the ultraviolet by Egli, Luca, Gröbner, Julian, Hülsen, Gregor, Schill, Herbert, Stübi, René

“…Total column ozone (TCO) is commonly measured by Brewer and Dobson spectroradiometers. Both types of instruments use solar irradiance measurements at four…”
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New Absolute Cavity Pyrgeometer equation by application of Kirchhoff's law and adding a convection term by Forgan, Bruce W, Gröbner, Julian, Reda, Ibrahim

“…An equation for the Absolute Cavity Pyrgeometer (ACP) is derived from application of Kirchhoff's law and the addition of a convection term to account for the…”
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The transition to new ozone absorption cross sections for Dobson and Brewer total ozone measurements by Voglmeier, Karl, Velazco, Voltaire A, Egli, Luca, Gröbner, Julian, Redondas, Alberto, Steinbrecht, Wolfgang

“…Comparisons between total ozone column (TOC) measurements from ground-based Dobson and Brewer spectrophotometers and from various satellite instruments…”
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A new photometric ozone reference in the Huggins bands: the absolute ozone absorption cross section at the 325 nm HeCd laser wavelength by Janssen, Christof, Elandaloussi, Hadj, Gröbner, Julian

“…The room temperature (294.09 K) absorption cross section of ozone at the 325 nm HeCd wavelength has been determined under careful consideration of possible…”
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The World Optical Depth Research and Calibration Center (WORCC) quality assurance and quality control of GAW-PFR AOD measurements by Kazadzis, Stelios, Kouremeti, Natalia, Nyeki, Stephan, Gröbner, Julian, Wehrli, Christoph

“…The World Optical Depth Research Calibration Center (WORCC) is a section within the World Radiation Center at Physikalisches-Meteorologisches Observatorium…”
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Monitoring of solar spectral ultraviolet irradiance in Aosta, Italy by Fountoulakis, Ilias, Diémoz, Henri, Siani, Anna Maria, Hülsen, Gregor, Gröbner, Julian

“…A Bentham DTMc300 spectroradiometer is deployed at the station of Aosta–Saint-Christophe, Italy, at the headquarters of the Regional Environmental Protection…”
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The high-resolution extraterrestrial solar spectrum (QASUMEFTS) determined from ground-based solar irradiance measurements by Gröbner, Julian, Kröger, Ingo, Egli, Luca, Hülsen, Gregor, Riechelmann, Stefan, Sperfeld, Peter

“…A high-resolution extraterrestrial solar spectrum has been determined from ground-based measurements of direct solar spectral irradiance (SSI) over the…”
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Aerosol optical depth determination in the UV using a four-channel precision filter radiometer by Carlund, Thomas, Kouremeti, Natalia, Kazadzis, Stelios, Gröbner, Julian

“…The determination of aerosol properties, especially the aerosol optical depth (AOD) in the ultraviolet (UV) wavelength region, is of great importance for…”
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method to calculate cloud-free long-wave irradiance at the surface based on radiative transfer modeling and temperature lapse rate estimates by Wacker, Stefan, Gröbner, Julian, Vuilleumier, Laurent

“…We demonstrate a method to improve the performance of commonly used parameterizations to calculate the cloud-free down-welling long-wave radiation at the…”
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Estimation of cloud optical thickness, single scattering albedo and effective droplet radius using a shortwave radiative closure study in Payerne by Aebi, Christine, Gröbner, Julian, Kazadzis, Stelios, Vuilleumier, Laurent, Gkikas, Antonis, Kämpfer, Niklaus

“…We have used a method based on ground-based solar radiation measurements and radiative transfer models (RTMs) in order to estimate the following cloud optical…”
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Representativeness of the Arosa/Davos Measurements for the Analysis of the Global Total Column Ozone Behavior by Rozanov, Eugene, Egorova, Tatiana, Egli, Luca, Karagodin-Doyennel, Arseniy, Sukhodolov, Timofei, Schill, Herbert, Stübi, Rene, Gröbner, Julian

“…The study investigates the representativeness of the total column ozone (TCO) measurements from the ground-based instruments located at the Arosa/Davos…”
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Uncertainty analysis of total ozone derived from direct solar irradiance spectra in the presence of unknown spectral deviations by Vaskuri, Anna, Kärhä, Petri, Egli, Luca, Gröbner, Julian, Ikonen, Erkki

“…We demonstrate the use of a Monte Carlo model to estimate the uncertainties in total ozone column (TOC) derived from ground-based direct solar spectral…”
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