Comparative Analysis of Land and Air Temperature in Romania since A.D. 1961

Ancuta Manea, Marius-Victor Birsan (), Viorica Dima and Loredana-Elena Havriș
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Ancuta Manea: Meteo Romania—National Meteorological Administration, Șos. Bucuresti-Ploiesti 97, 013686 Bucharest, Romania
Marius-Victor Birsan: Institute of Geography—Romanian Academy, Dimitrie Racoviță 12, 023993 Bucharest, Romania
Viorica Dima: Meteo Romania—National Meteorological Administration, Șos. Bucuresti-Ploiesti 97, 013686 Bucharest, Romania
Loredana-Elena Havriș: Institute of Geography—Romanian Academy, Dimitrie Racoviță 12, 023993 Bucharest, Romania

Land, 2024, vol. 13, issue 5, 1-10

Abstract: Daily time series with continuous records of mean air and soil temperature from 127 meteorological stations—fairly distributed over the country—were used to compute monthly temperature trends, as well as changes in the timing of the first and the last frost days over Romania since 1961. Results show that the frequency of the number of days with daily temperature averages below 0 °C in case of air and soil surface temperature is stable for most months, except for January, when (for both soil and air temperature), the number of days with a temperature below 0 °C is decreasing in the majority of the stations. The occurrence of the first day with (mean air and soil surface) temperatures below 0 °C, presents a delay in the south, south-east, and west, and an earlier occurrence in eastern and central regions. The occurrence of the last day with a mean air and soil surface temperature below 0 °C shows a stable trend for most stations (except for some small areas in the north, south-east and south-west of Romania). The regime of the land temperature is more stable, due to the physical characteristics of the soil, compared to the more versatile atmosphere. Linkages between thermal parameters and large-scale atmospheric circulation are also discussed.

Keywords: air temperature; soil surface temperature; nonparametric test; Mann–Kendall; Sen’s slope estimator; atmospheric circulation; Romania (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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