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Moscow megacity impact on summer precipitation: differentiation by rainfall intensity and large-scale weather conditionsтезисы доклада
- Авторы: Yarinich Yulia, Varentsov Mikhail, Platonov Vladimir, Stepanenko Victor, Chernokulsky Alexander
- Сборник: Abstracts of 11th International Conference on Urban Climate
- Тезисы
- Год издания: 2023
- Место издания: Sydney Australia, Sydney
- Первая страница: 612
- Аннотация: Moscow megacity impact on summer precipitation: differentiation by rainfall intensity and large-scale weather conditions / Y. Yarinich, M. Varentsov, V. Platonov, V. Stepanenko ,A. Chernokulsky // Abstracts of 11th International Conference on Urban Climate. — Sydney: 2023. — P. 612. It is widely accepted that highly urbanized regions affect cloud development and precipitation. In particular, precipitation amount tends to increase in the center and on the leeward side of a city. Yet, the magnitude of such effect varies strongly depending on geographical location and weather conditions. Moscow, the largest European megacity, already proved itself as a convenient testbed for numerous urban climate studies. Its impact on precipitation was also analyzed in a few studies, but most of them are outdated and report inconsistent results. Our study aims to examine the Moscow’s effect on summer precipitation and its linkage with large-scale weather patterns based on long-term observational data. We performed statistical analysis of precipitation data provided by weather stations in Moscow region (6 urban and 21 rural sites) for the period from May to September from 1988 to 2020. The frequency and daily precipitation sums were analyzed in various intensity gradations. In addition, ERA5 reanalysis data was used to estimate background convective instability, wind speed, integral water vapor content and frontal parameters in order to classify precipitation cases according to the synoptic-scale conditions. We demonstrate that mean seasonal precipitation among urban stations is higher than among rural stations by 5.3%. Meanwhile, we show that urban impact is especially pronounced for intense, but not the most extreme precipitation events: the frequency of 20–40 mm rainfalls in Moscow is higher by 21.4% than among rural stations. We also prove that urban impact is favored by unstable stratification, weak background flow, high water vapor content, and outside of baroclinic zones.
- Добавил в систему: Ярынич Юлия Ивановна