The relationship between air and soil temperature as a local indicator of climate change in small, agricultural catchment
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Centrum Wodne SGGW
Instytut Inżynierii Środowiska Szkoła Główna Gospodarstwa Wiejskiego
Agnieszka Joanna Hejduk   

Centrum Wodne SGGW
Submission date: 2019-11-17
Final revision date: 2020-01-26
Acceptance date: 2020-01-27
Publication date: 2020-04-20
Acta Sci. Pol. Formatio Circumiectus 2019;18(4):161–175
Aim of the study:
The aim of the study was to identify trends in changes in air and soil temperature and the relationship between them, as well as to investigate if short data set can be an indicator of local climate change.

Material and methods:
The investigation was based on the data of air and soil temperature collected between 2009 and 2015 at Czarna gauging station. The average daily, monthly, semi-annual and annual air and ground temperature at particular depths of the soil profile were calculated. Monthly average values were used to determine the relationship between air and soil temperature. Based on the maximum air temperature, the number of frosty, cold, cool, warm, hot and very hot days was calculated, according to the methodology given in the Polish Climate Atlas. The basic statistical measures, trends of the temperature change and linear regression were determined, as well as the statistical significance of the equation coefficients using the Student's t-test.

Results and conclusions:
A statistically significant trend of increasing average air temperature in the summer was shown. The annual average and winter average air temperature show an increasing, statistically insignificant trend. The number of frosty days shows a decreasing trend, opposite to the number of cold and very hot days. The average soil temperature shows an increasing trend for the surface layer. The monthly distribution of average soil temperature corresponds with the monthly distribution of average air temperature. There is a strong relationship between the air temperature and the soil temperature.