Terroir 2010 banner
IVES 9 IVES Conference Series 9 Using atmospheric and statistical models to understand local climate and assess spatial temperature variability at a fine scale over the Stellenbosch wine district, South Africa

Using atmospheric and statistical models to understand local climate and assess spatial temperature variability at a fine scale over the Stellenbosch wine district, South Africa

Abstract

Atmospheric and statistical models were used to increase understanding of potential climatic impacts, resulting from mesoscale physical processes that cause significant temperature variability for viticulture within the Stellenbosch Wine of Origin district. Hourly temperature values from 16 automatic weather stations and 40 tinytag data loggers located in the vineyards were analysed. The 5th of March 2009 was selected as an example to study the cooling potential of the terroirs in radiative weather conditions during grape ripening time. Differences reached more than 10°C between vineyards and can be considered as significant for viticulture. Numerical simulations using the Regional Atmospheric Modeling System were performed. Results for a horizontal grid resolution of 200 m over the Stellenbosch wine region for the 5th of March 2009 showed that the temperature difference was due to cool air accumulation with land and downslope breezes. Surface temperature data recorded in the vineyards were used to produce, by means of multicriteria statistical modelling, which took environmental factors into account, a map of spatial distribution of the daily minimum temperature at a fine scale (90 m). The use of the two models represented an interesting tool to help in identifying the cooling potential of locations for viticulture and, at a later stage, studying the impacts of climate change at fine scales.

DOI:

Publication date: October 6, 2020

Issue: Terroir 2010

Type: Article

Authors

V. Bonnardot (1), V. Carey (2), M. Madelin (3), S. Cautenet (4), Z. Coetzee (2), H. Quénol (1)

(1) COSTEL-LETG, UMR 6554 CNRS, Université Rennes2, Place du Recteur H. Le Moal, 35043 Rennes
(2) Department of Viticulture and Oenology, Stellenbosch University, Private Bag X1 Matieland 7602, RSA.
(3) PRODIG, UMR 8586 CNRS, Université Paris 7 Diderot, 2 rue Valette, 75005 Paris, France.
(4) LaMP, UMR 6016 CNRS, Université Blaise Pascal, 24 Avenue des Landais, 63177 Aubière, France

Contact the author

Keywords

Atmospheric modelling, statistical modelling, cooling potential, vineyard, South Africa

Tags

IVES Conference Series | Terroir 2010

Citation

Related articles…

Algae protein: fining agent for white wine, sustainable, non-allergenic and animal-free

The development of non-animal and non-allergenic alternatives to traditional protein fining agents used in winemaking is of critical importance in order to ensure consumer safety and production sustainability. This study evaluates the effect of protein extracted from three types of algae (spirulina, chlorella vulgaris and tetraselmis chuii) as fining agents on the polymeric proanthocyanidin content responsible for astringency, as well as their effect on the colour, phenolic composition and volatile aroma of two white wines (a and b).

Beneficial effects of moderate consumption of Teran red wine on blood lipid profile: a preliminary study on healthy volunteers

Moderate wine consumption may impact several human health aspects, among others as a result of phenolic compounds present in wine and their bioactive properties. The aim of this study was to determine whether six weeks of daily, moderate Teran red wine consumption affects the levels of total cholesterol, high-density lipoprotein cholesterol – HDL, low-density lipoprotein cholesterol – LDL, and triglycerides. Sixty-eight healthy adults (46 women and 22 men) aged 25-64 years voluntarily agreed to participate in the study.

Scalable asymptomatic grapevine leafroll virus complex-3 detection through integrated airborne imaging spectroscopy, autonomous robotics, and cloud computing

The past three decades of terrestrial remote sensing research have delivered unprecedented insights into our fundamental ability to detect, quantify, and differentiate plant disease (Gold 2021). However, much of our fundamental knowledge in this domain has come from studies in non-agricultural systems and until recently, most agricultural studies, when extant, have focused on tree crops where canopy closure and large plot and plant size facilitate stress detection at low spatial resolution. Recent engineering innovations and advancements in constellation architecture design have refined the accuracy and scalability of airborne and spaceborne sensing platforms, enabling us to monitor diverse specialty crops, including grapevine, planted in smaller, spatially varied fields.

Efecto de distintos ambientes sobre las características físico – químicas y sensoriales del Montepulciano d’Abruzzo DOC

La región de Abruzzo está situada entre los Apeninos y el mar Adriático, limitando al norte con el río Tronto y al sur con el Trigno. Desde un punto de vista físico se divide en dos franjas

Deciphering the function and regulation of VviEPFL9 paralogs to modulate stomatal density in grapevine through New Genomic Techniques

Stomata are microscopic pores mainly located in leaf epidermis, allowing gas exchanges between plants and atmosphere. Stomatal initiation relies on the transcription factor SPEECHLESS which is mainly regulated by the MAP kinase cascade, in turn controlled by small signaling peptides, the Epidermal Patterning Factors (EPF and EPF-Like), namely EPF1, EPF2 and EPFL9. While EPF1 and EPF2 induce the inhibition of SPEECHLESS, their antagonist, EPFL9, stabilizes it, leading to stomatal formation. In grapevine, there are two paralogs for EPFL9, VviEPFL9-1 and VviEPFL9-2. Despite their structural similarity, it remains unclear whether they are differentially regulated and have distinct roles.