Soil heat flux and air temperature as factors of radon (Rn-222) concentration in the near-ground air layer

• Autorzy: Podstawczyńska A. , Pawlak W.

Identyfikatory

DOI

10.1515/nuka-2016-0039

• Konferencja: International Conference „Radon in the Environment” (2nd ; 25-29.05.2015 ; Kraków, Poland)
• Języki publikacji: EN

Abstrakty

EN

A unique, highly time-resolved, and synchronous three-year dataset of near-surface atmospheric radon-222 as well as soil heat flux and air temperature measurements at two sites (rural and urban) in Central Poland are investigated. The recognition of temporal variability of Rn-222 and selected meteorological variables in the urban and rural areas served to create two statistical models for estimation of this radionuclide concentration at 2 m a.g.l. The description of the relationships between the variables for individual months was established on the basis of an exponential function and an exponential function with time derivative of predictor to account for the hysteresis issue. The model with time derivative provided better results. The weakest fitting of modelled data to empirical ones is observed for the winter months. During subsequent seasons, air temperature as well as QG-driven (soil heat flux) models exhibited very high agreement with the empirical data (MBE, RMSE, MAE, and ‘index of agreement’ by Willmott were used to evaluate the models). A restriction in the use of QG for Rn-222 concentration was observed only in winter in the case of snow cover occurrence, which reduces the daily QG variability. A unique, highly time-resolved, and synchronous three-year dataset of near-surface atmospheric radon-222 as well as soil heat flux and air temperature measurements at two sites (rural and urban) in Central Poland are investigated. The recognition of temporal variability of Rn-222 and selected meteorological variables in the urban and rural areas served to create two statistical models for estimation of this radionuclide concentration at 2 m a.g.l. The description of the relationships between the variables for individual months was established on the basis of an exponential function and an exponential function with time derivative of predictor to account for the hysteresis issue. The model with time derivative provided better results. The weakest fitting of modelled data to empirical ones is observed for the winter months. During subsequent seasons, air temperature as well as QG-driven (soil heat flux) models exhibited very high agreement with the empirical data (MBE, RMSE, MAE, and ‘index of agreement’ by Willmott were used to evaluate the models). A restriction in the use of QG for Rn-222 concentration was observed only in winter in the case of snow cover occurrence, which reduces the daily QG variability.

Słowa kluczowe

EN

air temperature; Central Poland; exponential function; Rn-222; soil heat flux

• Wydawca: Institute of Nuclear Chemistry and Technology
• Czasopismo: Nukleonika
• Rocznik: 2016
• Tom: Vol. 61, No. 3
• Strony: 231--237
• Opis fizyczny: Bibliogr. 30 poz., rys.

Twórcy

autor

Podstawczyńska A.

• Department of Meteorology and Climatology, University of Lodz, 88 Narutowicza Str., 90-139 Lodz, Poland, Tel.: [phone], Fax: [phone]

autor

Pawlak W.

• Department of Meteorology and Climatology, University of Lodz, 88 Narutowicza Str., 90-139 Lodz, Poland, Tel.: [phone], Fax: [phone]

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę.