Assessment of reanalysis datasets against radiosonde observation over the Eastern Mediterranean region

Abstract Four meteorological components (geopotential height Z , air temperature T dew point Td, and relative humidity RH) collected from ERA-5 ERA-Interim were compared with the observations of nine radiosonde stations different climatic changes, at isobaric levels (850, 700, 500, 200 hPa) during period 2000–2017, in order to assess accuracy aforementioned reanalysis datasets. The results showed that both datasets have a strong correlation observed variables, except upper troposphere. mean values geopotential grid dataset are generally consistent values, whereas considerable bias Td RH exists increases upwards. study clearly proved can be used compensate for lack observation. Furthermore, (during 1959–2021) an increasing trend surface lower troposphere, while decreased troposphere stratosphere. Finally this study, impact North Atlantic Oscillation Index (NAOI) on was also examined, negative relationship found between NAOI levels: surface, 850, 500 hPa, positive found, only winter, hPa. At level 100 is seasons.