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

Article


Jarvis, C., Darbyshire, R., Goodwin, I., Barlow, E. and Eckard, R.. 2018. "Spatial variation in springtime temperature index values during ENSO and IOD events shows non-equivalent phase response for viticultural regions in Australia." Agriculture and Forest Meteorology. 250-251, pp. 217-225. https://doi.org/10.1016/j.agrformet.2017.12.261
Article Title

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

ERA Journal ID1951
Article CategoryArticle
AuthorsJarvis, C. (Author), Darbyshire, R. (Author), Goodwin, I. (Author), Barlow, E. (Author) and Eckard, R. (Author)
Journal TitleAgriculture and Forest Meteorology
Agricultural and Forest Meteorology
Journal Citation250-251, pp. 217-225
Number of Pages9
Year2018
Place of PublicationNetherlands
ISSN0168-1923
1873-2240
Digital Object Identifier (DOI)https://doi.org/10.1016/j.agrformet.2017.12.261
Web Address (URL)https://www.sciencedirect.com/science/article/pii/S0168192317306810
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 during ENSO and IOD events. This analysis investigated variations in values of a viticultural index, summed daily maximum springtime temperature (SONmax), relative to ENSO-only, IOD-only and ENSO and IOD combined events (ENSOIOD), with the objective of determining whether or not SONmax values changed during the winegrape growing season. Representative sites in 18 viticultural regions in Australia that included a range of climates were selected for analysis. Regional SONmax response to ENSO, IOD, and ENSOIOD event phases was variable. Opposing phases of an event (e.g. IOD positive and IOD negative phases) differed in spatial impact and strength of impact, with some regions responding disproportionately to opposing phases. SONmax values recorded during ENSOIOD event phases showed the most deviation from the mean, suggesting combined ENSOIOD events caused greater SONmax anomalies than either an ENSO or IOD event alone; however, the magnitude of the anomalies differed between regions and varied by phase. Cluster analysis by event phase showed that while some regions consistently had a similar variance of SONmax values relative to other regions, different regions were inconsistent in response. Regional correlation strength and direction (positive or negative) was also related to event and phase, with response to warm and cool phases being non-equivalent. This highlights that impacts of opposing phases are not equal-but-opposite in strength and also vary regionally. Improving regional understanding of impact and prediction for ENSO, IOD, and particularly ENSOIOD would therefore be useful for seasonal planning of viticultural management, as these events can often be predicted before the start of the winegrape growing season in Australia.

Keywordsclimate drivers, viticulture, bioclimatic index, winegrape
ANZSRC Field of Research 2020370202. Climatology
300805. Oenology and viticulture
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Byline AffiliationsUniversity of Melbourne
Department of Primary Industries, New South Wales
Agriculture Victoria
Institution of OriginUniversity of Southern Queensland
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