scholarly journals Column ozone and aerosol optical properties retrieved from direct solar irradiance measurements during SOLVE II

2004 ◽  
Vol 4 (6) ◽  
pp. 7403-7431
Author(s):  
W. H. Swartz ◽  
J.-H. Yee ◽  
R. E. Shetter ◽  
S. R. Hall ◽  
B. L. Lefer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Irradiance ◽  
Aerosol Optical Properties ◽  
Ozone Loss ◽  
Spectral Fitting ◽  
Validation Experiment ◽  
Measurement Validation ◽  
Column Ozone ◽  
Spectral Solar Irradiance ◽  
Good Agreement

Abstract. Direct observation of the Sun at large solar zenith angles during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II)/Validation of International Satellites and study of Ozone Loss (VINTERSOL) campaign by several instruments provided a rich dataset for the retrieval and analysis of line-of-sight column composition, intercomparison, and measurement validation. A flexible, multi-species spectral fitting technique is presented and applied to spectral solar irradiance measurements made by the NCAR Direct beam Irradiance Atmospheric Spectrometer (DIAS) on-board the NASA DC-8. The approach allows for the independent retrieval of O3, O2·O2, and aerosol optical properties, by constraining Rayleigh extinction. We examine the 19 January 2003 and 6 February 2003 flights and find very good agreement of O3 and O2·O2 retrievals with forward-modeling calculations, even at large solar zenith angles, where refraction is important. Intercomparisons of retrieved ozone and aerosol optical thickness with results from the Ames Airborne Tracking Sunphotometer (AATS-14) are summarized.

scholarly journals Column ozone and aerosol optical properties retrieved from direct solar irradiance measurements during SOLVE II

2005 ◽  
Vol 5 (3) ◽  
pp. 611-622 ◽  
Author(s):  
W. H. Swartz ◽  
J.-H. Yee ◽  
R. E. Shetter ◽  
S. R. Hall ◽  
B. L. Lefer ◽  
...  
Keyword(s):  
Optical Properties ◽  
Solar Irradiance ◽  
Aerosol Optical Properties ◽  
Ozone Loss ◽  
Spectral Fitting ◽  
Validation Experiment ◽  
Measurement Validation ◽  
Column Ozone ◽  
Spectral Solar Irradiance ◽  
Good Agreement

Abstract. Direct observation of the Sun at large solar zenith angles during the second SAGE III Ozone Loss and Validation Experiment (SOLVE II)/Validation of International Satellites and study of Ozone Loss (VINTERSOL) campaign by several instruments provided a rich dataset for the retrieval and analysis of line-of-sight column composition, intercomparison, and measurement validation. A flexible, multi-species spectral fitting technique is presented and applied to spectral solar irradiance measurements made by the NCAR Direct beam Irradiance Atmospheric Spectrometer (DIAS) on-board the NASA DC-8. The approach allows for the independent retrieval of O3, O2·O2, and aerosol optical properties, by constraining Rayleigh extinction. We examine the 19 January 2003 and 6 February 2003 flights and find very good agreement of O3 and O2·O2 retrievals with forward-modeling calculations, even at large solar zenith angles, where refraction is important. Intercomparisons of retrieved ozone and aerosol optical thickness with results from the Ames Airborne Tracking Sunphotometer (AATS-14) are summarized.

scholarly journals Aerosol optical properties and their effect on the UV solar irradiance at Uccle, Belgium

2013 ◽  
Author(s):  
Efterpi Nikitidou ◽  
Veerle De Bock ◽  
Hugo De Backer ◽  
Andreas Kazantzidis
Keyword(s):  
Optical Properties ◽  
Solar Irradiance ◽  
Aerosol Optical Properties

Representation of aerosol optical properties using a chemistry transport model to improve solar irradiance modelling

Solar Energy ◽  
2018 ◽  
Vol 176 ◽  
pp. 439-452 ◽  
Author(s):  
Karine Sartelet ◽  
Carole Legorgeu ◽  
Lya Lugon ◽  
Yassine Maanane ◽  
Luc Musson-Genon
Keyword(s):  
Optical Properties ◽  
Solar Irradiance ◽  
Transport Model ◽  
Aerosol Optical Properties ◽  
Chemistry Transport Model

scholarly journals Uncertainty analysis of total ozone derived from direct solar irradiance spectra in the presence of unknown spectral deviations

2018 ◽  
Vol 11 (6) ◽  
pp. 3595-3610 ◽  
Author(s):  
Anna Vaskuri ◽  
Petri Kärhä ◽  
Luca Egli ◽  
Julian Gröbner ◽  
Erkki Ikonen
Keyword(s):  
Solar Irradiance ◽  
Total Ozone ◽  
Monte Carlo Model ◽  
Spectral Irradiance ◽  
Total Column Ozone ◽  
Column Ozone ◽  
Ozone Column ◽  
Total Column ◽  
Local Noon ◽  
Good Agreement

Abstract. 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 irradiance measurements. The model estimates the effects of possible systematic spectral deviations in the solar irradiance spectra on the uncertainties in retrieved TOC. The model is tested with spectral data measured with three different spectroradiometers at an intercomparison campaign of the research project “Traceability for atmospheric total column ozone” at Izaña, Tenerife on 17 September 2016. The TOC values derived at local noon have expanded uncertainties of 1.3 % (3.6 DU) for a high-end scanning spectroradiometer, 1.5 % (4.4 DU) for a high-end array spectroradiometer, and 4.7 % (13.3 DU) for a roughly adopted instrument based on commercially available components and an array spectroradiometer when correlations are taken into account. When neglecting the effects of systematic spectral deviations, the uncertainties reduce by a factor of 3. The TOC results of all devices have good agreement with each other, within the uncertainties, and with the reference values of the order of 282 DU during the analysed day, measured with Brewer spectrophotometer #183.

Spectral Solar Irradiance And Some Optical Properties For Various Polluted Atmospheres

Solar Energy ◽  
2000 ◽  
Vol 69 (3) ◽  
pp. 215-227 ◽  
Author(s):  
Constantinos P Jacovides ◽  
Michael D Steven ◽  
Demosthenis N Asimakopoulos
Keyword(s):  
Optical Properties ◽  
Solar Irradiance ◽  
Spectral Solar Irradiance

scholarly journals Spatial, temporal, and vertical variability of polar stratospheric ozone loss in the Arctic winters 2004/2005–2009/2010

2010 ◽  
Vol 10 (20) ◽  
pp. 9915-9930 ◽  
Author(s):  
J. Kuttippurath ◽  
S. Godin-Beekmann ◽  
F. Lefèvre ◽  
F. Goutail
Keyword(s):  
Transport Model ◽  
Stratospheric Ozone ◽  
Polar Vortex ◽  
The Arctic ◽  
Model Calculations ◽  
Ozone Loss ◽  
Vertical Range ◽  
Column Ozone ◽  
Catalytic Cycles ◽  
Good Agreement

Abstract. The polar stratospheric ozone loss during the Arctic winters 2004/2005–2009/2010 is investigated by using high resolution simulations from the chemical transport model Mimosa-Chim and observations from Aura Microwave Limb Sounder (MLS), by applying the passive tracer technique. The winter 2004/2005 shows the coldest temperatures, highest area of polar stratospheric clouds and strongest chlorine activation in 2004/2005–2009/2010. The ozone loss diagnosed from both simulations and measurements inside the polar vortex at 475 K ranges from 0.7 ppmv in the warm winter 2005/2006 to 1.5–1.7 ppmv in the cold winter 2004/2005. Halogenated (chlorine and bromine) catalytic cycles contribute to 75–90% of the ozone loss at this level. At 675 K the lowest loss of 0.3–0.5 ppmv is computed in 2008/2009, and the highest loss of 1.3 ppmv is estimated in 2006/2007 by the model and in 2004/2005 by MLS. Most of the ozone loss (60–75%) at this level results from nitrogen catalytic cycles rather than halogen cycles. At both 475 and 675 K levels the simulated ozone and ozone loss evolution inside the vortex is in reasonably good agreement with the MLS observations. The ozone partial column loss in 350–850 K deduced from the model calculations at the MLS sampling locations inside the polar vortex ranges between 43 DU in 2005/2006 and 109 DU in 2004/2005, while those derived from the MLS observations range between 26 DU and 115 DU for the same winters. The partial column ozone depletion derived in that vertical range is larger than that estimated in 350–550 K by 19±7 DU on average, mainly due to NOx chemistry. The column ozone loss estimates from both Mimosa-Chim and MLS in 350–850 K are generally in good agreement with those derived from ground-based ultraviolet-visible spectrometer total ozone observations for the respective winters, except in 2010.

scholarly journals Empirical predictions of CCN from aerosol optical properties at four remote sites

2010 ◽  
Vol 10 (4) ◽  
pp. 8995-9013
Author(s):  
A. Jefferson
Keyword(s):  
Optical Properties ◽  
Correlation Coefficients ◽  
Empirical Method ◽  
Data Uncertainty ◽  
Black Forest ◽  
Aerosol Optical Properties ◽  
Remote Sites ◽  
Single Scatter ◽  
Good Agreement ◽  
Aerosol Type

Abstract. This study presents an empirical method to predict the CCN concentration as a function of percent supersaturation. The aerosol optical properties of backscatter fraction and single scatter albedo function as proxies for the aerosol size and composition in a power law relationship to CCN. This method is tested at four sites with aged aerosol: SGP (Oklahoma, USA), FKB (Black Forest, Germany), HFE (Hefei, China) and GRW (Graciosa, Azores). Each site represents a different aerosol type and thus demonstrates the method robustness and limitations. Good agreement was found between the calculated and measured CCN with slopes between 0.81 and 1.03 and correlation coefficients (r2 values) between 0.59 and 0.67. The fit quality declined at low CCN concentrations in a region with higher data uncertainty.

scholarly journals Development of on-site self-calibration and retrieval methods for sky-radiometer observations of precipitable water vapor

2019 ◽  
Author(s):  
Masahiro Momoi ◽  
Rei Kudo ◽  
Kazuma Aoki ◽  
Tatsuhiro Mori ◽  
Kazuhiko Miura ◽  
...  
Keyword(s):  
Optical Properties ◽  
Water Vapor ◽  
Solar Irradiance ◽  
Precipitable Water ◽  
Dry Season ◽  
Calibration Constant ◽  
Aerosol Optical Properties ◽  
Vapor Channel ◽  
Long Term Observation

Abstract. The Prede sky-radiometer, whose aerosol channels are calibrated by on-site measurements (the Improved Langley method), has been used for continuous long-term observation of aerosol properties. However, continuous long-term observation of precipitable water vapor (PWV) by sky-radiometer remain challenge, because the water vapor channel is generally calibrated by the standard Langley method at limited observation sites (e.g., the Mauna Loa Observatory). In this study, we developed SKYMAP, a new onsite self-calibration method for the water vapor channel of the Prede sky-radiometer using diffuse radiances normalized by direct solar irradiance. The SKYMAP algorithm consists of three steps. First, aerosol optical and microphysical properties are retrieved using direct solar irradiances and the normalized diffuse radiances at aerosol channels. The aerosol optical properties at the water vapor channel are interpolated from those at aerosol channels. Second, the transmittance of PWV is retrieved using the diffuse radiance normalized to the direct solar irradiance at the water vapor channel, which does not need the calibration constant. Third, the calibration constant at the water vapor channel is estimated from the transmittance of PWV and aerosol optical properties. Intensive sensitivity tests of SKYMAP using simulated data of the sky-radiometer showed that the calibration constant is retrieved reasonably well for PWV < 2 cm, indicating that SKYMAP can calibrate the water vapor channel on-site in dry conditions. Then SKYMAP was applied to actual measurements in the dry season at two sites (Tsukuba and Chiba, Japan). Because the SKYMAP algorithm is useful for clear-sky and low PWV (< 2 cm) conditions, the water vapor channel was calibrated for the dry season. After determining the calibration constant, PWV is able to be retrieved using direct solar irradiances for the whole year. The retrieved PWV values correspond well to those derived from a Global Navigation Satellite System (GNSS)/Global Positioning System (GPS) receiver, a microwave radiometer, and a AERONET sun-sky radiometer at both sites (correlation coefficient γ > 0.96), indicating that the Prede sky-radiometer provides both aerosol and PWV data based on its unique on-site calibration methods.

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