Spatial variation in springtime temperature index values during ENSO and IOD events shows non-equivalent phase response for viticultural regions in Australia

Abstract

Seasonal variations in winegrape production are intimately connected with growing season weather, with unusually hot or cold temperatures impacting grape and subsequent wine composition. El Niño-Southern Oscillation (ENSO) and the Indian Ocean Dipole (IOD) phases impact weather across Australia, particularly at the start of the Southern Hemisphere winegrape growing season; however, impacts are spatially and temporally variable. Temperature-based viticultural climatic indices (e.g. daily maximum springtime temperature) summarise growing season conditions, which allows for inter-annual and inter-regional comparison of conditions and can be used to assess changes to temperature that occur durin..