Hydrophysics

Hydrophysics

The impact of the latest reanalysis data of the ECMWF model on the surface temperature changes of the Caspian Sea

Document Type : Original Article

Authors
Manijeh Vosoughi 1
Dariush Mansoury 2
Abbassali Aliakbari Bidokhti 3
1 Physical Oceanography, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Iran.
2 Department of Marine Physics, Faculty of Marine Science, Tarbiat Modares University, Nour, Iran
3 Department of Space Physics, Institute of Geophysics, University of Tehran, Tehran, Iran.
Abstract
ERA-Interim data have been utilized in many studies relating to the hydrodynamic modeling of seas and oceans, among which the use of ERA5 data has been emphasized more in recent researches. Thereby, investigating the difference between the two recent reanalysis data (ERA-Interim and ERA5) and their impact on determining the physical parameters of the sea (output of the model) is of particular importance. In this research, the surface temperature changes of the Caspian Sea were investigated based on the latest reanalysis data of the European Center for Medium-Term Atmospheric Forecasts (ECMWF) using a developed three-dimensional hydrodynamic numerical model. In this model, the data of wind and atmospheric fluxes were obtained from ECMWF daily database with a spatial resolution of 0.25 and a time step of 6 hours. The model was implemented separately for the ERA-Interim and ERA5 data for a period of 10 consecutive years (2009-2018). The results showed that the difference in temporal and spatial changes in the surface temperature of the Caspian Sea was more consistent in ERA5 compared to ERA-Interim. Also, the difference in the temporal and spatial changes in the surface temperature of the Caspian Sea in the two modes of ERA5 and ERA-Interim was insignificant in the northern basin, relatively significant in the middle basin, and highly significant in the southern basin. As a result, ERA5 has improved the results of the average annual temperature of the model output by about 7% in the southern basin of the Caspian Sea.
Keywords
Sea surface temperature
Era-Interim
Era5
POM model
Caspian Sea

Subjects

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  • Receive Date 27 July 2022
  • Revise Date 29 August 2022
  • Accept Date 18 September 2022