Terroir 2016 banner
IVES 9 IVES Conference Series 9 International Terroir Conferences 9 Terroir 2016 9 Climates of Wine Regions Worldwide 9 A fine-scale approach to map bioclimatic indices using and comparing dynamical and geostatistical methods

A fine-scale approach to map bioclimatic indices using and comparing dynamical and geostatistical methods

Abstract

Climate, especially temperature, plays a major role in grapevine development. Several bioclimaticindices have been created to relate temperature to grapevine phenology (e.g. Winkler Index, Huglin Index, Grapevine Flowering Véraison model [GFV]). However, temperature variability can be significant at vineyard scale, so knowledge of the various climatic mechanisms leading to this variability is essential in order to improve local management of vineyards in response to climate change. Indeed, current climate change models are not accurate enough to take into account temperature variability at the vineyard scale (Dunn et al., 2015).

This study therefore proposes a method for compare regional modelling and fine-scale observations to map temperatures and bioclimatic indices at fine spatial resolution for some recent growing seasons. This study focuses on two vineyard areas, the Saint-Emilion and Pomerol region in France and the Marlborough vineyard region in New Zealand. A regression model using temperature from networks of measurements has been created in order to map temperature and bioclimatic indices at vineyard scale (100 metres for Marlborough and 25 metres for Saint-Emilion and Pomerol). To complement the field measurements, the advanced physics-based three-dimensional numerical weather model Weather Research and Forecasting – WRF (http://wrf-model.org/index.php) has been used, providing hourly meteorological parameters over a complete growing season for each site at 1, 3 and 9 and 27 kilometre resolution. The output of the WRF model provides temperature, wind speed and direction, pressure, and solar radiation data at these different resolutions.

The application of different scales of modelling allows improvement in understanding the climate component of the specific terroirs of the study areas.

Download the PDF

DOI:

Publication date: June 23, 2020

Issue: Terroir 2016

Type: Article

Authors

Renan Le Roux (1), Marwan Katurji (2), PeymanZawar-Reza (2), Laure de Rességuier (3), Andrew Sturman (2), Cornelis van Leeuwen (3), Amber Parker (4), Mike Trought (5) and Hervé Quénol (1)

(1) LETG-COSTEL, UMR 6554 CNRS, Université de Rennes 2, Place du Recteur Henri Le Moal, Rennes, France
(2) Centre for Atmospheric Research, University of Canterbury, Christchurch, New Zealand
(3) EGFV, Bordeaux Sciences Agro, INRA, Univ. Bordeaux, ISVV, F-33140 Villenave d’Ornon,France
(4) Lincoln University, P O Box 85084, Lincoln, Christchurch, New Zealand
(5) New Zealand Institute for Plant and Food Research Ltd, Blenheim, Marlborough, New Zealand

Contact the author

Keywords

Climate, phenology, grapevine, bioclimatic indices, modelling

Tags

IVES Conference Series | Terroir 2016

Citation

Related articles…

Unraveling grapevine resilience to water and nutrient limitations

Water and nutrient availability significantly impact crop yield, thus the application of sustainable strategies towards efficient water use and nutrient absorption by plants is needed.

Read More

Effect of supplementation with inactive yeast during alcoholic fermentation in base wine for sparkling

INTRODUCTION: Foam stability of sparkling wines is significantly favored by the presence of surface active agents such as proteins and polysaccharides [1]. For that reason, the renowned sparkling wines are aged after the second fermentation in contact with the lees for several months (even years). Thereby wines are enriched in these macromolecules due to yeast autolysis. Since this practice is slow and costly, winemakers are seeking for alternative procedures to increase their concentration in base wines. In that sense, the supplementation with inactive yeast during alcoholic fermentation has been proposed [2]. The aim of this study was to determine whether this new strategy is really useful for enriching base wines in macromolecules and for improving foam properties of the base wines.

Read More

Tracking the origin of Tempranillo Tinto through whole genome resequencing and high-throughput genotyping  

Grapevine cultivars are vegetatively propagated to maintain their varietal characteristics. This process of multiplication leads to spontaneous somatic mutations that can eventually generate a variant phenotype, of potential interest for cultivar improvement and innovation. However, regardless their phenotypic effect, somatic mutations stack in the genome, and they can be used to reveal the origin and dissemination history of ancient cultivars. Here, a stringent somatic variant calling over whole genome resequencing data from 35 ‘Tempranillo Tinto’ clones or old vines from seven Iberian winemaking regions revealed 135 single nucleotide variations (SNVs) shared by some of the clonal lines.

Read More

Leaf removal to regulate fruit ripening in Cabernet-Sauvignon

Aim: Under the effects of climate change it is becoming increasingly common to observe excessively fast sugar accumulation while anthocyanin and flavour development are lagging behind. Understanding the impact of different leaf removal techniques on ripening will provide vineyard managers with a canopy management strategy suitable for

Read More

The influence of tertiary and quaternary deposits on the viticultural potential of the terroirs to be found in Geneva, Switzerland

The 1365 ha of the Genevese vineyard are located at the south-western corner of the Swiss plateau, between 395m and 505 m altitude.

Read More