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…

Effects of environmental factors and vineyard pratices on wine flora dynamics

he intensification of t vineyard practices led to an impoverishment of the biological diversity. In vineyard management, the reflection to reduce pesticides uses concerns mainly the soil management of the vineyard, and often focuses on flora management in the inter-row.

Read More

EVALUATING WINEMAKING APPLICATIONS OF ULTRAFILTRATION TECHNOLOGY

Ultrafiltration is a process that fractionates mixtures using semipermeable membranes, primarily on the basis of molecular weight. Depending on the nominal molecular weight cut-off (MWCO) specifications of the membrane, smaller molecules pass through the membrane into the ‘permeate’, while larger molecules are retained and concentrated in the ‘retentate’. This study investigated applications of ultrafiltration technology for enhanced wine quality and profitability. The key objective was to establish to what extent ultrafiltration could be used to manage phenolic compounds (associated with astringency or bitterness) and proteins (associated with haze formation) in white wine.

Read More

Black foot disease in South African vineyards and grapevine nurseries

Over the last few years a drastic reduction has been noted in the survival rate of vine cuttings in nurseries, as well as in young vineyards in the Western Cape Province of South Africa. The low average take percentages of young vines can be attributed to several factors, including fungal, bacterial and viral diseases, insect and nematode pests,

Read More

FLAVONOID POTENTIAL OF MINORITY RED GRAPE VARIETIES

The alteration in the rainfall pattern and the increase in the temperatures associated to global climate change are already affecting wine production in many viticultural regions all around the world (1). In fact, grapes are nowadays ripening earlier from a technological point of view than in the past, but they are not necessarily mature from a phenolic point of view. Consequently, the wines made from these grapes can be unbalanced or show high alcohol content. Dramatic shifts in viticultural areas are currently being projected for the future (2).

Read More

Vine nitrogen status and the terroir effect: a study on cv. Doral in the Vaud vineyard (Switzerland)

A 3-year study was conducted in the Vaud vineyard (Switzerland) to evaluate the effects of « terroir » on the ecophysiology and fruit compostion of Vitis vinifera L. cv.

Read More