Objective selection of model run from regional climate models ensemble

  • V. Khokhlov
  • E. Serga
  • L. Neodstrelova
Keywords: climate change, CORDEX, temperature, precipitation, evaporation

Abstract

In this paper, a method was developed in relation to the north-western coast of the Black Sea in order to determine the optimal model run from regional climate models ensemble.

As a result of climate change, which has been observed since the late 1980s in Ukraine, various natural objects changes have been also transformed. The study of such changes in the future is possible only by using runs of global or regional climate models. Moreover, the step of the spatial grid in the climate model must be comparative with the spatial size of a natural object under study.

In the north-western coast of the Black Sea, climate change is characterized by increasing aridity of climate and a corresponding decrease in freshwater inflows into coastal lagoons from their catchments, making ecosystems of these lagoons sensitive and vulnerable to climate change. Using numerical models in order to study climate change impact on these natural objects requires input hydrometeorological information in the spatial grid points, the distance between which should correspond to the horizontal size of lagoons, i.e. several kilometers.

In this paper, data from the scenarios RCP4.5 and RCP8.5 of the ensemble from 14 model runs with different regional climatic models of the CORDEX project were used to simulate the future changes of the temperature and precipitation regime. For each grid point and scenario, a single simulation was selected from the ensemble, which best reproduces the intra-annual changes of temperature, precipitation, and evaporation compared to the ensemble means.

Despite the sufficiently large distance between the estuaries, the method allowed the selection of a single optimal model run, which shows the significant differences in spring and summer precipitation as well as year-around evaporation in the southern and northern parts of the northwestern coast of the region. This run well reproduces the relationship between temperature, precipitation, and evaporation in the southern and northern parts of the northwestern coast of the Black Sea.

References

Khokhlov, V.N. (2007). [Quantitative description of European climate change during second half of 20th century]. Ukraïnsʹkij gìdrometeorologìčnij žurnal. [Ukrainian hydrometeorological journal], 2, pp. 35-42. (in Russ)

Serga, E.N., Khokhlov, V.M. & Nedostrelova, L.V. (2020). [Modern dynamics in main climate characteristics at sites of North-Western Black Sea coast]. Ukraïnsʹkij gìdrometeorologìčnij žurnal. [Ukrainian hydrometeorological journal], 26, pp. 37-49. https://doi.org/10.31481/uhmj.26.2020.03. (in Ukr)

Tuchkovenko, Y., Loboda, N. & Khokhlov, V. (2018). The physio-geographical background and ecology of Tyligulskyi Liman Lagoon. In: Lillebø, A. I., Stålnacke, P., Gooch, G.D. (eds.) Coastal Lagoons in Europe. Integrated Water Resource Management. London: IWA Publishing. Pp. 77-85.

Jacob, D. et al. (2014). EURO-CORDEX: new high-resolution climate change projections for European impact research. Regional Environmental Change, 14(2), pp. 563-578. https://doi.org/10.1007/s10113-013-0499-2.

Kushnir, D.V. & Tuchkovenko, Yu.S. (2020). [Modelling the variability of hydrological parameters of the Sasyk reservoir impoundment under various options of its operation]. Ukraïnsʹkij gìdrometeorologìčnij žurnal. [Ukrainian hydrometeorological journal], 26, pp. 116-129. https://doi.org/10.31481/uhmj.26.2020.10. (in Ukr)

Moss, R.H. et al. (2010). The next generation of scenarios for climate change research and assessment. Nature, 463, pp. 747-756.

Zamfirova, M.S. & Khokhlov, V.M. (2020). [Air temperature and precipitation regime in Ukraine in 2021-2050 by CORDEX model ensemble]. Ukraïnsʹkij gìdrometeorologìčnij žurnal [Ukrainian hydrometeorological journal], 26, pp. 37-49. https://doi.org/10.31481/uhmj.26.2020.03. (in Ukr)

Khokhlov, V. & Yermolenko, N. (2015). [Future climate change and its impact on precipitation and temperature in Ukraine]. Ukraïnsʹkij gìdrometeorologìčnij žurnal. [Ukrainian hydrometeorological journal], 16, pp. 76-82. https://doi.org/10.31481/uhmj.16.2015.10. (in Ukr)

Balabukh, V. et al. (2018). [Projections of changes climatic mean and extreme parameters of thermal regime by the middle of the 21st century in Ukraine]. Nature Management, 1, pp. 97-113. (in Russ)

Krakovska, S.V. et al. (2018). [Projections of air temperature and relative humidity in Ukraine regions to the middle of the 21st century based on regional climate model ensembles]. Geoinformatika [Geoinformatics], 3(67), pp. 62-77. (in Ukr).

Published
2021-12-14
How to Cite
Khokhlov, V., Serga, E., & Neodstrelova, L. (2021). Objective selection of model run from regional climate models ensemble. Ukrainian Hydrometeorological Journal, (28), 29-36. https://doi.org/10.31481/uhmj.28.2021.03
Section
Meteorology and Climatology