No abstract

Vine is highly sensitive to climate changes, particularly temperature changes, which can be reflected in the quality of yield. We obtained meteorological data from weather station Llíria in viticultural site Valencia DO in Spain from the period 1961-2016 and elaborated the future modelling scenario Representative Concentration Pathways 4.5 (RCP4.5) and RCP8.5 for the period 1985-2100 within the Coupled Model Intercomparison, Project Phase 5 (CMIP5) for daily temperature, precipitation and evapotranspiration. The irrigation requirements (IR) future models for grape varieties Tempranillo and Bobal were elaborated. Temperature and evapotranspiration trends increased during observation period and are estimated to continue rising, according to the future model. Nevertheless, precipitation trend is estimated to decrease according to the model. The future scenarios show increase trend of temperature and evapotranspiration and decrease of precipitation. Total IR for the period 1985 – 2100 is expected to increase during growing season months according to the trendline for 16.6 mm (RCP4.5) and 40.0 mm (RCP8.5) for Tempranillo and 8.2 mm (RCP4.5) and 30.9 mm (RCP8.5) for Bobal grape variety. The outcome of this research is important to understand better the future climatic trends in Valencia DO and provides valuable data to face the future climate changes.

Last but not least I am deeply grateful to Čmrljček, my parents, my great parents, Kustec family and Le Clec'h family for their incredible and warm support over the PhD journey.

Objective of this research is to describe and compare the results of climate variables analyzed in two different viticulture sites; indeed, one study site is located in the Valencia wine region in Spain and the other is in the Goriška Brda region in Slovenia. The research includes the climate analysis for a period of five decades in both study sites, from 1965 to 2013, to follow temperature measured daily. In addition, the Huglin and Winkler indexes were calculated in the same research sites for the same time period. The analysis was conducted in four weather stations (two in Spanish site and two in Slovene site). The climate data analysis showed a considerable temporal variability with notable increase of temperatures; indeed, it showed also the significant spatial variability of climatic variables. The continent and sea influence created climate and spatial differences on the both study sites, which are comparable with the climate evolution in the study period. This preliminary work is encouraging and will be further developed. Moreover, the results of this paper will be used to elaborate a climate model for the 2015-2065 period in each site separately. The results of the climate comparison, will give us two different climate models, one for each study site, which will contribute to improve viticulture adaptation in the future.