Terroir 2016 banner
IVES 9 IVES Conference Series 9 International Terroir Conferences 9 Terroir 2016 9 Climates of Wine Regions Worldwide 9 Within vineyard temperature structure and variability in the umpqua valley of Oregon

Within vineyard temperature structure and variability in the umpqua valley of Oregon

Abstract

Climate influences viticulture and wine production at various scales with the majority of attention given to regional characteristics that define the general varieties that can be grown and the wine styles that can be produced. However, within vineyard scale effects of climate can be substantial due to landscape variations. To better understand the effect of local weather and climate on terroir, the goal of this research was to examine within vineyard temperature variations. Temperature data was collected from 23 sites in a commercial 33 ha vineyard in the Umpqua Valley of Oregon over a five-year period during 2011-2015. Dormant period temperatures (Nov-Mar) varied by roughly 1°C across the 23 sites with the extreme minimum temperatures varying by just over 3°C. Spring temperatures (Apr-May) varied by roughly 2°C for the vineyard locations with frost occurrence varying as much as nine days in most years. During the summer (Jun-Aug) maximum temperatures varied more than minimum temperatures across the sites, while extreme maximums ranged nearly 5°C.

During the ripening period (Sept-Oct) diurnal temperatures ranges at the 23 sites averaged 20°C. Over all years and sites the growing season heat accumulation averaged 1467 GDD but ranged from 1181 in the coolest year (2011) to 1705 in the warmest year (2015). The average range of GDD during these vintages shows that within vineyard variability in heat accumulation is 375 GDD. These variations in temperatures and heat accumulation are weakly correlated with elevation differences between the sites, however the combined effects of slope/aspect have more significant correlations with temperatures at these sites, especially minimum temperatures. As a result of the within vineyard differences in temperatures and heat accumulation, this commercial vineyard adequately ripens a range of varieties from Albariño, , Viognier, Syrah, Tempranillo, Grenache, , Touriga Nacional, Tannat and others.

Download the PDF

DOI:

Publication date: June 22, 2020

Issue: Terroir 2016

Type: Article

Authors

Henry E. Jones1, Gregory V. Jones1,2

(1) Fault Line Vineyards and Abacela Winery, 12500 Lookingglass Road, Roseburg, Oregon, USA
(2) Southern Oregon University, 1250 Siskiyou Blvd, Ashland, Oregon, USA

Contact the author

Keywords

terroir, temperature, mesoscale, viticulture, spatial variation

Tags

IVES Conference Series | Terroir 2016

Citation

Related articles…

Ageing of sweet wines: oxygen evolution according to bung and barrel type

Barrel ageing is a crucial step in the wine process because it allows many changes to the wine as enrichment, colour stabilization, clarification and also a slow oxygenation. Effects of the oak barrel have to be known to prevent oxidation of the wine. The type of bung used during ageing is also a parameter to consider. Ageing sweet wines in barrel is a real challenge. These wines may need some oxygen at the beginning of ageing but they should be protected at the end of their maturation, to avoid oxidation.

Read More

Optimization and validation of a fully automated HS-SPME method for determination of VCCs and its application in wines submitted to accelerated ageing

Wine aroma is a complex gaseous mixture composed of various compounds; some of these molecules derive directly from the grapes while most of them are released and synthetized during fermentation or are due to ageing reactions

Read More

Relevance of the polyphenolic profile during oxidative aging in the accumulation and disappearance of oxidative and varietal aromas

The main objective of this work is to study and model the impact of the polyphenolic profile on the stability and quality of wine aroma during oxidative aging.

Read More

Activation of retrotransposition in grapevine

Retrotransposons, particularly of the Ty-Copia and Ty-Gypsy superfamilies, represent the most abundant and widespread transposons in many plant genomes. Grapevine is no exception and it is clear that these mobile elements have played a major role in the evolution of Vitaceae genomes. While speculation abounds around the possible role of transposons in plant genomes, outside of the rather obvious involvement of retrotransposition in fueling genome expansion, there is little clarity of the actual role these elements have in both developing new genetic variation and in modulating epigenetic responses within genomes to changing climate. To this end we have been exploring de-novo assembled Sauvignon blanc and Pinot noir genomes with a view to catalogue retrotransposon loci to determine the structural intactness and thus age of insertion variation across a small number of clonal linages of these 2 varietals in an attempt to identify ‘live’ TE loci.

Read More

Usefulness and limits of the crop water stress index obtained from leaf temperature for vine water status monitoring

Aims: This work aimed i) to calibrate the accuracy of estimating vineyard water status by crop water stress index (CWSI) compared to stem water potential; ii) to determine the time interval during the day that best correlates to stem water potential and iii) to understand the its usefulness.

Read More