Atmospheric Ozone, Solar Radiation, 2004-2005
Total amount of atmospheric ozone and its vertical distribution, Belsk 2004-2005
Series: (D-67), 2006, pp.3-47
Ozone observations have been made by means of Dobson spectrophotometer No. 84 in the Geophysical Observatory at Belsk since March 1963. This publication presents all total ozone values and vertical distribution of ozone over Belsk in 2004 and 2005 obtained from the conventional Umkehr observations.
Vertical distributions of ozone from Umkehr observations have been evaluated by the World Ozone Data Centre, Atmospheric Environment Service, Downsview Ontario, Canada. Vertical distributions of ozone as well as daily values of total ozone are also published by the Atmospheric Environment Service of Canada in cooperation with the WMO (Ozone Data for the World).
Total ozone, sulfur dioxide and UV-B radiation measurements with the Brewer spectrophotometer No. 64 at Belsk, Poland, 2004-2005
Series: (D-67), 2006, pp.49-74
The Brewer spectrophotometer No. 64 has been installed in the Geophysical Observatory of the Polish Academy of Sciences at Belsk in February 1991.
The Brewer spectrophotometer is an optical instrument which measures atmospheric ozone and sulfur dioxide by examining intensities of the attenuated incident solar ultraviolet radiation at five specific wavelengths. The automatic, computer-controlled operation of the instrument allows different types of measurements and calibrations to be made according to an adjustable schedule. The instrument is capable of taking direct sun, UV-B and Umkehr measurements in unattended operation for several days.
Measurements of atmospheric trace gases at Belsk, Poland, 2004-2005
Series: (D-67), 2006, pp.75-99
Tropospheric Ozone, Sulfur Dioxide, Nitrogen Dioxide and Carbon Monoxide have been measured at Belsk throughout 2004 and 2005. Measurements have been performed by automatic analysers produced by Monitor Labs Inc. and Advanced Pollution Instrumentation, Inc.
Solar radiation, Belsk 2004-2005
Series: (D-67), 2006, pp.101-113
Tables - instrumentation and symbols
Quality control of Belsk’s Dobson spectrophotometer: comparison with the European sub-standard Dobson spectrophotometer and satellite (OMI) overpasses
Series: (D-67), 2006, pp.115-121
The total ozone measurements by Belsk's Dobson spectrophotometer have been compared with the satellite total ozone taken during the OMI (on board of Aura spacecraft) overpasses for the period August 2004 - July 2006. The agreement between both data sets is much better if the results of the recent (June 2005) calibration campaign of Belsk's Dobson at Hohenpeissenberg are incorporated to the standard total ozone calculation software. The bias and standard deviation of the normalized differences between the satellite and Dobson total ozone are less than 1% and 2-3% (lower range of standard deviation is for the most reliable ADQP obervations), respectively, for the period. These estimates correspond to those found for the satellite-Dobson comparisons carried out for Hradec Kralove and Hohenpeissenberg.
UV measurements at the Polish Polar Station, Hornsund, calibration and data for the period 2005-2006
Series: (D-67), 2006, pp.123-144
Measurements of various radiative quantities have been resumed at the Polish Polar Station, Hornsund, in spring 2005. The UV-B, UV-A, total solar irradiances and the sunshine duration with 1-min resolution are available there, together with the aerosols characteristics (single scattering albedo, aerosols optical depth). The quality of the UV data is assured by comparison of the instruments' readings with the output of Institute of Geophysics, Polish Academy of Sciences, traveling UV calibration system. The daily and seasonal variations of UV-B, UV-A, and total solar irradiance are discussed for the period March 2005 - September 2006. The daily doses of UV-B, UV-A, daily sum of the total solar irradiance, and the UV index are shown in the table. The maximum value of UV daily dose and UV index found in late spring were ~3000 Jeryt/m2 and ~4, respectively. These values are larger than our previous estimates obtained from the biometer measurements (5-min resolution) over the period 1996-1997 (Krzyścin and Sobolewski, 2001). Importance of the ground albedo variations on the UV-B irradiance is demonstrated and a need of setting off such observations at Hornsund is suggested.
Correlation between surface visibility and aerosol optical depth recorded at Geophysical Observatory at Belsk
Series: (D-67), 2006, pp.145-157
Correlation between surface visibility and aerosol optical depth has been analyzed on the basis of results of observations taken at the Geophysical Observatory at Belsk from March 2001 to May 2005. Marginal and conditional distributions of both variables as well as their cumulative distribution functions have been determined. Covariance in two-dimensional empirical distribution of both variables is negative. The values of correlation ratios from the sample (exy = 0.37; eyx = 0.31) indicate that about 13.5% of the total variation of surface visibility can be explained by influence of aerosol optical depth, while about 9.5% of the total variation of aerosol optical depth can be explained by variations of surface visibility.
The value of correlation coefficient r = -0.28 for the study period indicates rather moderate linear correlation between surface visibility and aerosol optical depth. Empirical curves of regression of both characteristics in relation to each other indicate non-linearity of the relationships, while curvilinear indexes of interdependence suggest linearity of the relationships. Examination of linearity of linear regression models constructed on the basis of empirical data indicates that the dependence of both characteristics lies at the limit of linearity. At 0.05 significance level, the dependence of aerosol optical depth on surface visibility is linear, while the dependence of surface visibility on aerosol optical depth is nonlinear.
Statistical tests executed at 0.05 significance level indicate statistical significance of relationship between analyzed characteristics, essentially different from zero values of correlation ratios, and the value of correlation coefficient essentially less than zero.
Morphological classification of vertical profiles of aerosol extinction coefficient in the troposphere obtained from lidar measurements at Belsk Observatory in 2000-2003
Series: (D-67), 2006, pp.159-170
The paper presents an attempt at morphological classification of vertical profiles of aerosol extinction coefficient in the troposphere on the basis of results of lidar returns obtained in two channels: green (wavelength of 532 nm) and infrared (wavelength of 1064 nm). The selected six types of profiles are characteristic of:
1. Clear troposphere;
2. Troposphere "loaded from the bottom";
3. Troposphere "loaded from the top";
4. Troposphere "loaded from the bottom up to the top";
5. Troposphere "loaded" with Sahara's aerosol;
6. Troposphere containing thin stratus clouds transparent for laser beam.
A method of "screening" of clouds and layers of aerosol from ice and water clouds on the basis of profiles of Angstrom exponent has been applied. Also, the 24-month variation of monthly averaged optical depths of the atmosphere for aerosol component obtained from lidar measurements made at 532 nm wavelength, and from radiometric measurements made at 500 nm wavelength has been presented.