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## Analysis of Radiometric Measurements of Atmospheric Parameters in Aircraft Icing Periods in the Area of the St. Petersburg Airport

Transactions of IAA RAS, issue 54, 27–31 (2020)

Keywords: aircraft icing, radiometry, total vapor content, cloud ceiling height, atmospheric boundary layer

### Abstract

Aircraft icing in-flight is one of the adverse and potentially dangerous meteorological phenomena for aviation. The greatest danger of icing is for small-sized and unmanned aerial vehicles, where timely and accurate forecast is the only protection against icing. The development of new methods for predicting possible icing, including automated methods of ground-based observations, requires a detailed study of the meteorological conditions under which it occurs. The paper presents the results of radiometric parameters of the atmosphere in the area of the Pulkovo airfield under icing conditions and in the absence of icing and their effect on the icing probability. The data of our measurements of the total vapor content of the atmosphere and air temperature were used, as well as data on the cloud ceiling height and actual in-flight icing cases, provided by the Pulkovo airport weather service. Based on the data obtained, histograms of the icing probability distribution were constructed depending on the measured atmospheric parameters. The ranges of temperature and total vapor content of the atmosphere, at which the probability of icing is maximum, have been specified. The largest number of icing cases is observed at values of total vapor content in the range from 0.7 to 1.1 ${\small\mathrm g/cm^2}$, with the maximum of the probability distribution at Q = 0.71 ${\small\mathrm g/cm^2}$. All the cases of icing were observed at temperatures from –12 °C to 0 °С without a marked dependence on height. A large increase in the number of icing cases was revealed at the cloud ceiling in the range from 200 to 400 m. The data obtained can be used both to refine the criteria for predicting the risk of icing in automated forecast systems and as auxiliary parameters in manual forecasting.

### Citation

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V. V. Zuev, A. V. Pavlinsky, E. S. Savelieva, G. N. Il'in, V. Yu. Bykov. Analysis of Radiometric Measurements of Atmospheric Parameters in Aircraft Icing Periods in the Area of the St. Petersburg Airport // Transactions of IAA RAS. — 2020. — Issue 54. — P. 27–31. @article{zuev2020, abstract = {Aircraft icing in-flight is one of the adverse and potentially dangerous meteorological phenomena for aviation. The greatest danger of icing is for small-sized and unmanned aerial vehicles, where timely and accurate forecast is the only protection against icing. The development of new methods for predicting possible icing, including automated methods of ground-based observations, requires a detailed study of the meteorological conditions under which it occurs. The paper presents the results of radiometric parameters of the atmosphere in the area of the Pulkovo airfield under icing conditions and in the absence of icing and their effect on the icing probability. The data of our measurements of the total vapor content of the atmosphere and air temperature were used, as well as data on the cloud ceiling height and actual in-flight icing cases, provided by the Pulkovo airport weather service. Based on the data obtained, histograms of the icing probability distribution were constructed depending on the measured atmospheric parameters. The ranges of temperature and total vapor content of the atmosphere, at which the probability of icing is maximum, have been specified. The largest number of icing cases is observed at values of total vapor content in the range from 0.7 to 1.1 ${\small\mathrm g/cm^2}$, with the maximum of the probability distribution at Q = 0.71 ${\small\mathrm g/cm^2}$. All the cases of icing were observed at temperatures from –12 °C to 0 °С without a marked dependence on height. A large increase in the number of icing cases was revealed at the cloud ceiling in the range from 200 to 400 m. The data obtained can be used both to refine the criteria for predicting the risk of icing in automated forecast systems and as auxiliary parameters in manual forecasting.}, author = {V.~V. Zuev and A.~V. Pavlinsky and E.~S. Savelieva and G.~N. Il'in and V.~Yu. Bykov}, doi = {10.32876/ApplAstron.54.27-31}, issue = {54}, journal = {Transactions of IAA RAS}, keyword = {aircraft icing, radiometry, total vapor content, cloud ceiling height, atmospheric boundary layer}, pages = {27--31}, title = {Analysis of Radiometric Measurements of Atmospheric Parameters in Aircraft Icing Periods in the Area of the St. Petersburg Airport}, url = {http://iaaras.ru/en/library/paper/2059/}, year = {2020} } TY - JOUR TI - Analysis of Radiometric Measurements of Atmospheric Parameters in Aircraft Icing Periods in the Area of the St. Petersburg Airport AU - Zuev, V. V. AU - Pavlinsky, A. V. AU - Savelieva, E. S. AU - Il'in, G. N. AU - Bykov, V. Yu. PY - 2020 T2 - Transactions of IAA RAS IS - 54 SP - 27 AB - Aircraft icing in-flight is one of the adverse and potentially dangerous meteorological phenomena for aviation. The greatest danger of icing is for small-sized and unmanned aerial vehicles, where timely and accurate forecast is the only protection against icing. The development of new methods for predicting possible icing, including automated methods of ground-based observations, requires a detailed study of the meteorological conditions under which it occurs. The paper presents the results of radiometric parameters of the atmosphere in the area of the Pulkovo airfield under icing conditions and in the absence of icing and their effect on the icing probability. The data of our measurements of the total vapor content of the atmosphere and air temperature were used, as well as data on the cloud ceiling height and actual in-flight icing cases, provided by the Pulkovo airport weather service. Based on the data obtained, histograms of the icing probability distribution were constructed depending on the measured atmospheric parameters. The ranges of temperature and total vapor content of the atmosphere, at which the probability of icing is maximum, have been specified. The largest number of icing cases is observed at values of total vapor content in the range from 0.7 to 1.1 ${\small\mathrm g/cm^2}$, with the maximum of the probability distribution at Q = 0.71 ${\small\mathrm g/cm^2}$. All the cases of icing were observed at temperatures from –12 °C to 0 °С without a marked dependence on height. A large increase in the number of icing cases was revealed at the cloud ceiling in the range from 200 to 400 m. The data obtained can be used both to refine the criteria for predicting the risk of icing in automated forecast systems and as auxiliary parameters in manual forecasting. DO - 10.32876/ApplAstron.54.27-31 UR - http://iaaras.ru/en/library/paper/2059/ ER -