Abstract
Daily variation of Danube River temperature measured at Oltenitț gauging station over 9 years (2008-2016) was analysed in comparison with the air temperature measured by satellite in the same location between 1979-2020. Air temperature shows a nearly 2°C increase over the 40-years period, which can be attributed to both climate warming and anthropic impact. Water temperature was modeled with a sinusoidal function and variation with discharge was discussed. Long-term trend of hourly surface air temperature variation was obtained from Open Weather data. Air - water temperature dependency was fitted with a logistic function with good approximation. Resulting correlations help predict water temperature as a function of satellite - measured air temperature.
Highlights
Stream temperature is one of the most important parameters that indicates the health of the aquatic environment
In Romania, during 1991-2019 air temperature has increased by about 1.5 °C [5]
Considering the climate is changing a maximum of half of this period should be used for predicting water temperature with the same values of model parameters
Summary
Stream temperature is one of the most important parameters that indicates the health of the aquatic environment. European Environment Agency assessed that the average annual temperature for the European land area for the last decade (2008–2017) was between 1.6 °C and 1.7 °C above the pre-industrial level, which makes it the warmest decade on record [4]. In Romania, during 1991-2019 air temperature has increased by about 1.5 °C [5]. The frequency of extreme heat waves increased during the last 20 years [6, 7]. These phenomena impact river temperature, during summer periods, when precipitation and discharges are the lowest
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