Hoke wrote:David M. Bueker wrote:Carl Eppig wrote:
As for blaming high octane wine on global warming, there is nothing to prevent earlier harvesting of grapes.
Except unripe flavors. Sugar levels in grapes are not the only measurement. If the seeds and stems are green then the wines will likely taste astingent and have "off" flavors like green pepper or excessive grassy notes (speaking of reds here).
It's all tied together.
Correct, David. James' initial statement reveals an essential misunderstanding of the physiology of winegrapes. If it was simply a matter of picking at lower sugar levels, the problem would be easy to remedy. But then you'd be picking at significantly higher acid to sugar/fruit ratios, and you'd be getting sifgificantly more green flavors and phenols in your wine.
Hoke, David,
I don't agree with this. This debate, which is in my estimation very topical (thank you Robin), is sometimes blurred by the focus on alcohol levels in bottled wine. Those numbers are a side-effect; the reason for them is that some critics and consumers insist that very high quality wine should have a) very ripe fruit flavors; b) relatively soft tannins compared with similar examples from 30 years ago; and c) an absence of any green flavors or any firm tannins.
Most of the increase in alcohols in the new world is due to deliberate choices by the wineries, not climatic change. This can be easily seen in the argument between growers and wineries in Napa; wineries are requesting higher and higher brix levels, growers are complaining about it. There is comparable pressure on Old World wineries to make 'critic wines', but it is at least accompanied by highly atypical vintages like '97 and (especially) '03 that make more balance fruit well-nigh impossible. But even in the old world it has a lot to do with deliberate choice.
Re 'more green flavors': you both seem to be accepting the new assumption about ripeness levels, that 'green' flavors are simply undesirable in red wine. This choice, which IMO has little to do with plant physiology and everything to do with the palates of several important critics, is relatively new. Most if the great classic clarets and CA Cabernets I was raised on had at least some capsicum notes, as do current bottles of my favorite non-classic red wines such as Chinon and Teroldego; the effort to eradicate this range of flavors is an important part of the trend towards higher levels of ripeness. (That, and candied fruit flavors and falling-off-the-bone tannins.)
Wine is subject to fashion trends, like so many other consumer goods. I just hope this hemline goes back down again before too long; I would love to be able to drink Bordeax again, for one thing.