Climate change in Rioja wines, fact or fiction?

Long time ago we wanted to try (or to check), if climate change is a reality in Rioja wines. Last year we were selecting some plots to develop a very interesting test. We wanted to compare the wine made from higher vineyards (always above 750 meters high), with the lower conventional wine (between 350 and 500 meters). To give even more character to this particular wine, we just went ahead only with which the ones that were facing north. We were trying to give to the wine cooler temperatures, less hours of sunshine annually and important thermal gradient between night and day. With these conditions, the plots really were micro -plots, fairly old and with very low production of grapes. So, we created the SANTALBA COTAS ALTAS (or in english, SANTALBA HIGH TOPS).

Wine made from grapes from Tempranillo (60%) and Grenache (40 %), from micro-plots situated on slopes at high altitude and north facing. The slow ripening of the grapes gives this wine fresh and fruity aromas, light body and low alcohol content (more information here) .

Wine process - Part III

After this alcoholic fermentation and as we have been talking about, wine should have another fermentation called Malolactic fermentation. This point of fermentations is really important and a decisive aspect for the final result.

This process is done when the malic acid turn into lactic acid because of the lactic bacteria. During the process there is a very important emission of carbonic gas, and that is why the winery and the elaboration area has a very modern and sophisticated alarm system to detect the carbonic level and, just in case, get it out from the winery.

This fermentation is also called Secundary fermentation.

Temperature control panel

The malolactic fermentation effects are the depletion of the total acidity because part of it turned it into carbonic gas. This gas is lost and detached during the process.

The acid malic fermentation is caused because of the development of the lactic bacteria located in the ripe grape skin.

In Bodegas Santalba, fermentations are controlled and supervised by a very modern and innovative temperature control system where a panel tell us how is working each tank and if necessary send cold or hot in each moment.

When this stage is concluded we have different options to continue the wine process until the wine will be in our cups... keep and eye and we will continue soon

Wine process - Part II

We continue with the wine process and as we told you in our last post, with the FERMENTATION, one of the most important points during the elaboration process.

The grape juice needs to overcome two different fermentations, the alcoholic and the malolactic.

ALCOHOLIC FERMENTATION
The alcoholic fermentation is the process when the sugar turns into alcohol.
That is with are needed the yeasts, microorganism that we can find naturally in the grape skin (kind of white dust you can find out side the grape skin).

The oxigen is the responsable to start this fermentation, because of the yeasts need it in their growth period.
However, at the end of the fermentation the quantity of oxigen must be smaller to keep the ethyl alcohol and get the acetic acid. 

From the alcoholic fermentation, we obtain heat energy and we have to control the temperature because if it increase too much,(25-30 ºC) the yeasts could die and the fermentation will be stooped.

Another product from the alcoholic fermentation is the gas, carbon dioxide and it cause the bubbles and the boiling effect, and of course the characteristic aroma from the fermentation. There is a video from our tanks during this period, it is amazing! More than 30.000 litres... 

                       
This boiling effect makes the grape skins go to the top of the tank (solids) and create the "hat". This "hat" protect the grape juice from bacteria and another microorganism from the skin and also is from we get the tanins and the color, aromas and  another susbtances like Resveratrol located in the skin.