Barbaros GÖNENÇGIL, Istanbul University, Turkey
Onur HALIS, Istanbul University, Turkey
Zahide ACAR, Canakkale Onsekiz Mart University, Turkey
The frequency of extreme precipitation and increases in precipitation intensity are the most obvious indicators of climate change. Heavy precipitation events also cause many social problems. Especially in the Black Sea coast, as a result of heavy precipitation, great struggles were given in many regions. Within the scope of the study, it was aimed to draw attention to the atmospheric conditions of the precipitations in Bart?n, Kastamonu and Sinop, located on the northern coast of Turkey, in August 2021. For this purpose, hourly precipitation data were obtained from meteorological stations in the western Black Sea region. In addition, rawinsonde observations, meteorological maps (surface, 700hPa, 800hPa and 500 hPa) and Black Sea surface temperatures provided by NOAA were evaluated between 9-12 August 2021.
According to the evaluations made; while high-pressure areas in the north and northwest of the Black Sea strengthened on 6-9 August 2021, a strong trough developed on Turkey on 8 August and caused the pressure to decrease over the Black Sea. When Samsun's rawinsonde data and NOAA’s data are examined, the Black Sea surface temperature is 27 °C and the air temperature is around 10 °C at 2000m altitude. Thus, there is a 17 °C temperature difference between the sea surface and 2000 meters on 10-12 August 2021. In this period, the Black Sea, which is quite warm compared to its surroundings, gained the feature of a convergence area. The cold air coming from the north, northwest and west warmed up in this section and gained the characteristic of a humid and unstable air mass. Many stations in the western Turkey’s Black Sea coastline received high precipitation total (such as Kastamonu/Bozkurt/Mamatlar 422.3 mm, Sinop/Ayanc?k 303.9 mm, Bart?n Ulus/Ceyüpler 318.9mm) on 10-12 August. These heavy rains, together with the interventions to the riverbed because of human activities, caused flood disaster and 82 people lost their lives.
Mots clés : heavy precipitation|sea surface temperature|Turkey|Black Sea
A104741BG